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Measurements of Formaldehyde and TVOC Emission from Paints and Coating Materials using Small Chamber Method for Building Composites 被引量:1
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作者 Jin-A KIM Sumin KIM +1 位作者 Hyun-Joong KIM Janghoo SEO 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第1期120-125,共6页
An optimal test method for paint is proposed; additionally, the Field and Laboratory Emission Cell (FLEC) method used in Europe is applied as a substitute for the 20 L small chamber method. The emission factors of t... An optimal test method for paint is proposed; additionally, the Field and Laboratory Emission Cell (FLEC) method used in Europe is applied as a substitute for the 20 L small chamber method. The emission factors of total volatile organic compounds (TVOC) and formaldehyde from oil-based paint, emulsion paint, and water-dispersion paint with a coating weight of 300 g/m2, cured for 24/48 hours, were measured using the 20 L small chamber method. The emission rate of TVOC and formaldehyde from all paints began to stabilize after approximately 7 days after 24/48 hours of curing even though Korean standards stipulate that paint should be measured and analyzed after the third day of application. The emission factor of TVOC and formaldehyde from oil-based, emulsion, and water-dispersion paints were also measured using the FLEC method. There was good correlation between the 20 L small chamber method and the FLEC method for oil-based, emulsion, and water-dispersion paint emissions. With the FLEC method, using paints prepared under identical conditions, the emission rate was stable 24 hours after installation of samples because the air flow rate of FLEC is much higher than that of a 20 L small chamber, and the relative cell volume of FLEC is much smaller than that of a 20 L small chamber. 展开更多
关键词 FORMALDEHYDE TVOC paints coating materials FLEC
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Waves scattering induced by an interface crack in a coated material
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作者 常军 刘勇 许金泉 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第9期950-955,共6页
This paper deals with the two-dimensional problem of elastic wave scattering from a finite crack at the interface between a coated material layer and its substrate. By adopting the Fourier transform method and introdu... This paper deals with the two-dimensional problem of elastic wave scattering from a finite crack at the interface between a coated material layer and its substrate. By adopting the Fourier transform method and introducing the crack opening displacement function, the boundary value problem is simplified for numerically solving a system of Cauchy-type singular integral equations by means of Jacobi polynomial expansion. The stress intensity factors and the crack opening displacements are defined in terms of the integral equations solutions. The influence of the dimensionless wave number and the ratio of crack length to layer thickness on the stress intensity factors and crack opening displacements are discussed. 展开更多
关键词 Wave scattering lnterfacial crack coated materials
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Antibacterial activities and corrosion behavior of novel PEO/nanostructured ZrO_2 coating on Mg alloy 被引量:13
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作者 Mohammadreza DAROONPARVAR Muhamad Azizi MAT YAJID +4 位作者 Rajeev KUMAR GUPTA Noordin MOHD YUSOF Hamid Reza BAKHSHESHI-RAD Hamidreza GHANDVAR Ehsan GHASEMI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第8期1571-1581,共11页
Plasma electrolytic oxidation(PEO) was developed as a bond coat for air plasma sprayed(APS) nanostructure ZrO2 as top coat to enhance the corrosion resistance and antibacterial activity of Mg alloy. Corrosion beha... Plasma electrolytic oxidation(PEO) was developed as a bond coat for air plasma sprayed(APS) nanostructure ZrO2 as top coat to enhance the corrosion resistance and antibacterial activity of Mg alloy. Corrosion behavior and antibacterial activities of coated and uncoated samples were assessed by electrochemical tests and agar diffusion method toward Escherichia coli(E. coli) bacterial pathogens, respectively. The lowest corrosion current density and the highest charge transfer resistance, phase angle and impedance modulus were observed for PEO/nano-ZrO2 coated sample compared with those of PEO coated and bare Mg alloys. Nano-ZrO2 top coat which has completely sealed PEO bond coat is able to considerably delay aggressive ions transportation towards Mg alloy surface and significantly enhances corrosion resistance of Mg alloy in simulated body fluid(SBF) solution. Moreover, higher antibacterial activity was also observed in PEO/nano-ZrO2 coating against bacterial strains than that of the PEO coated and bare Mg alloys. This observation was attributed to the presence of ZrO2 nanoparticles which decelerate E. coli growth as a result of E. coli membranes. 展开更多
关键词 Mg alloy CERAMICS coating materials microstructure scanning electron microscopy (SEM)
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In situ synthesis of Fe-based alloy clad coatings containing TiB_2–TiN –(h-BN) 被引量:1
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作者 Shao-qun Jiang Gang Wang +3 位作者 Qing-wen Ren Chuan-duo Yang Ze-hua Wang and Ze-hua Zhou 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第6期613-619,共7页
Fe-based alloy coatings containing TiB2–TiN –(h-BN) were synthesized in situ on Q235 steel substrates by a plasma cladding process using the powders of Fe901 alloy, Ti, and h-BN as raw materials. The effects of Ti... Fe-based alloy coatings containing TiB2–TiN –(h-BN) were synthesized in situ on Q235 steel substrates by a plasma cladding process using the powders of Fe901 alloy, Ti, and h-BN as raw materials. The effects of Ti/h-BN mass ratio on interfacial bonds between the coating and substrate along with the microstructures and microhardnesses of the coatings were investigated. The results show that the Ti/h-BN mass ratio is a vital factor in the formation of the coatings. Free h-BN can be introduced into the coatings by adding an excess amount of h-BN into the precursor. Decreases in the Ti/h-BN mass ratio improve the microstructural uniformity and compactness and enhance the interfacial bonds of the coatings. At a Ti/h-BN mass ratio of 10/20, the coating is free of cracks and micropores, and mainly consists of Fe-Cr, Fe3B, TiB2, TiN, Ti2N, TiB, FeN, FeB, Fe2B, and h-BN phases. Its average microhardness in the zone between 0.1–2.8 mm from the coating surface is about Hv0.2 551.5. 展开更多
关键词 iron-based materials coatings plasma cladding in situ synthesis microhardness
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Water-conducting Characteristics and Micro-dynamic Self-adjusting Behavior of Polyacrylamide/Montinorillonite Coating 被引量:1
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作者 杜红梅 张增志 +1 位作者 WU Miaomiao ZHAO Jin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1191-1197,共7页
A water-conducting polyacrylamide/montmorillonite coating was prepared by solutionblending.The coating was coated on fiber and then composited with polymer to form a composite film material that used for water saving ... A water-conducting polyacrylamide/montmorillonite coating was prepared by solutionblending.The coating was coated on fiber and then composited with polymer to form a composite film material that used for water saving and tree planting in arid and desert regions.The coating's water-conducting characteristics and dynamic self-adjusting behavior were investigated by Fourier transform infrared(FTIR)spectroscopy,thermal analysis(TG-DTA),and environmental scanning electron microscopy(ESEM).The results showed that the coating's water-conducting rate increased but water-retention capacity weakened with increasing montmorillonite content.The water-loss rate was positively related to temperature and negatively related to soil moisture.Water potential greatly influenced the water-conducting rate of the coating during its water conduction process.When the coating was at a low water potential,the montmorillonite particles interconnected and water was conducted quickly via montmorillonite layers,whereas when the coating was at a high potential,the montmorillonite particles disconnected and water was conducted slowly via the swelled polyacrylamide net structure.The rate can be regulated by changing the proportion of polyacrylamide and montmorillonite to guarantee a reasonable water supply for trees and make trees easier to survive.Thus,the survival rate of trees can be increased and the use of water resources can be significantly reduced. 展开更多
关键词 desertification survival rate water saving composite material water potential coating
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Sputter Deposited Carbon Material based Fabry-Perot Sensor and Downhole Application
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作者 WANG Yingying LIU Xiaohui +2 位作者 CHEN Xiaoan SUN Zhihui ZHAO Qingchao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第6期1143-1149,共7页
To prevent hydrogen-induced loss and achieve long-term effective parameters monitoring in harsh downhole environment,we proposed a Fabry-Perot sensor with vacuum sputter deposited carbon coating film,in which we emplo... To prevent hydrogen-induced loss and achieve long-term effective parameters monitoring in harsh downhole environment,we proposed a Fabry-Perot sensor with vacuum sputter deposited carbon coating film,in which we employed a deposition technology with a higher particle kinetic energy,closer substrate adhesion,and denser films,to deposit the coating film on the surface of the quartz capillary glass tube to protect the sensor from corrosion.The sensitivity and accuracy of the Fabry-Perot sensor with carbon film deposition can reach 369 nm/MPa and 0.02%FS,respectively.Meanwhile,the sensor has less hysteresis error and good pressure linearity of more than 0.99999 for repeatable pressure measurement.The downhole practice monitoring data indicated that this fiber-optic sensor exhibited excellent performance and the sputter deposited carbon coating can effectively decrease hydrogen loss. 展开更多
关键词 quartz substrate Fabry-Perot sensor vacuum sputtering carbon coating material
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Performance of the Cement Matrix Composite Material With Rubber Powder
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作者 宋少民 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第1期77-80,共4页
The effect of the deferent rubber content substituted for fine aggregate on the mortar performance was studied.The effects of the rubber coated with the coating materials on the mortar compressive strength,bending str... The effect of the deferent rubber content substituted for fine aggregate on the mortar performance was studied.The effects of the rubber coated with the coating materials on the mortar compressive strength,bending strength and impact work were discussed.The optimum rubber powder content and the suitable coating material were found.Through the electrical probe test-BEI,SEI and calcium ion distribution,and the slight crack and the interface between the rubber and cement matrix are analyzed.The results show that the rubber powder coated with the surface treatment materials A,B and C has the capability of absorbing a large amount of energy under the compressive and flexural load and the slight cracks of R-C were controlled and restrained. 展开更多
关键词 rubber powder cement matrix composite material TOUGHNESS coating material
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Molecular simulation of interfacial reaction between TiAl alloy melts and different coatings
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作者 Yan-wei Sui Cheng Cheng +5 位作者 Kun Feng Ji-qiu Qi Ye-zeng He Fu-xiang Wei Qing-kun Meng Zhi Sun 《China Foundry》 SCIE 2017年第3期205-210,共6页
The effect of coatings(Y_2O_3, Zr O_2 and Al_2O_3) on the interfacial reaction of Ti Al alloys was studied with molecular dynamics. The binding energy of coatings and the diffusion process of oxygen in the melt were s... The effect of coatings(Y_2O_3, Zr O_2 and Al_2O_3) on the interfacial reaction of Ti Al alloys was studied with molecular dynamics. The binding energy of coatings and the diffusion process of oxygen in the melt were simulated, and then the simulation results were compared with the experimental results. The simulation results indicate that for each of the three simulated coatings, inordinate interfacial reactions have occurred between the coating and the melt. The binding energy results show that Y_2O_3 has the best stability and is the most difficult to break down. Zr O_2 has the greatest decomposition energy and is the easiest to break down in the melt. Besides, the molecular dynamics indicate that the diffusion coefficient of the oxygen atom in Al_2O_3 is larger than that in the other two coatings, indicating that oxygen diffusion in Al_2O_3 is the fastest at a given temperature. The experimental results show that the oxygen concentration of the melt with Al_2O_3 coating is the highest, and the oxygen diffusion is of similar magnitude to the simulation values, from which the conclusion can be obtained that the oxygen concentration is significantly influenced by the coating materials. 展开更多
关键词 TiAl alloy interfacial reaction molecular simulation coating material
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Three-Layer PE Corrosion-Inhibiting Coating for Steel Pipeline
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作者 Li Aiguo Zheng Aijing(Senior Engineer of Research Institute of Engineering Technology of CNPC) 《China Oil & Gas》 CAS 1994年第2期48-53,共6页
关键词 Corrosion control coating material Steel plate POLYMER
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MORPHOLOGICAL,MECHANICAL,THERMAL AND TRIBOLOGICAL PROPERTIES OF ENVIRONMENTALLY FRIENDLY CONSTRUCTION MATERIALS:RECYCLED LDPE COMPOSITES FILLED BY BLAST FURNACE DUST
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作者 Merve Tuna Kayili Gülser Çelebi Abdulmecit Guldas 《Journal of Green Building》 2020年第3期159-175,共17页
This study focused on developing a sustainable composite material using metallic wastes of the iron-steel industry and plastic wastes of the plastic industry in order to reduce resultant waste from the production proc... This study focused on developing a sustainable composite material using metallic wastes of the iron-steel industry and plastic wastes of the plastic industry in order to reduce resultant waste from the production processes of various industrial products and to sustain waste management of these industries.In this study,different amounts of blast furnace dust(BFD),which is the major iron-steel industry waste and is used as filler for recycled low-density polyethylene(LDPE),was mixed with LDPE to produce the composite material.The morphology,mechanical,vicat softening temperature thermal conductivity,hardness and wear resistance properties of BFD filled LDPE composites were assessed.The increasing of BFD in recycled LDPE improved the heat resistance,increased thermal conductivity and wear resistance of composite materials.In addition,it was found that the composite materials had sufficient mechanical properties,when mechanical tests were evaluated.These results showed that the produced composite material could be used in buildings as a floor coating material and thereby saving raw materials and resources,as well as potentially reducing environmental problems. 展开更多
关键词 Blast furnace dust LDPE plastic waste recycling composites mechanical properties floor coating material
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High-entropy(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))2Hf_(2)O_(7) ceramic: A promising thermal barrier coating material 被引量:8
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作者 Longkang Cong Wei Li +2 位作者 Jiancheng Wang Shengyue Gu Shouyang Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第6期199-204,共6页
Thermal barrier coating(TBC)materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine.In this study,a novel high entropy hafnate(Y_(0.2)Gd_(0.2)Dy_(0.2)E... Thermal barrier coating(TBC)materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine.In this study,a novel high entropy hafnate(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7) was synthesized by solution combustion method and investigated as a potential TBC layer.The as-synthesized(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7) possesses a pure single disordered fluorite phase with a highly homogeneous distribution of rare earth(RE)cations,exhibiting prominent phase stability and excellent chemical compatibility with Al_(2)O_(3) even at 1300°C.Moreover,(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7) demonstrates a more sluggish grain growth rate than Y_(2)Hf_(2)O_(7).The thermal conductivity of(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7)(0.73-0.93 W m^(-1)K^(-1))is smaller than those of components RE_(2)Hf_(2)O_(7) and many high entropy TBC materials.Beside,the calculated thermal expansion coefficient(TEC)of(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7)(10.68×10^(-6)/K,1100°C)is smaller than that of yttriastabilized zirconia(YSZ).Based on the results of this work,(Y_(0.2)Gd_(0.2)Dy_(0.2)Er_(0.2)Yb_(0.2))_(2)Hf_(2)O_(7) is suitable for the next generation TBC materials with outstanding properties. 展开更多
关键词 High entropy ceramic Thermal barrier coating material Disordered fluorite structure Thermophysical properties
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Preparation of microencapsulatedα-olefin drag reducing polymer used in oil pipeline transportation 被引量:3
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作者 Li Bing Xing Wenguo +4 位作者 Dong Guilin Chen Xiangjun Zhou Ningning Qin Zhanbo Zhang Changqiao 《Petroleum Science》 SCIE CAS CSCD 2011年第1期99-107,共9页
Microcapsules containing oil drag-reducing polymer particles were prepared by melting-scattering and condensing of polyethylene wax,in-situ polymerization of urea and formaldehyde,and interfacial polymerization of sty... Microcapsules containing oil drag-reducing polymer particles were prepared by melting-scattering and condensing of polyethylene wax,in-situ polymerization of urea and formaldehyde,and interfacial polymerization of styrene respectively.The related processes were studied by a molecular dynamics simulation method,and molecular design of microcapsule isolation agent was carried out on the basis of the simulation.The technologies for preparing microencapsulated oil drag-reducing polymer particles were compared and the circulation drag reducing efficiency of the microencapsulated polymer particles was evaluated based on the characterization results and their dissolution properties.Molecular design of a microcapsule isolation agent suggests that a-olefin polymer particles can be stably dispersed in water by using long-chain alkyl sodium salt surfactant which can prevent the agglomeration ofα-olefin polymer particles.The results of simulation of the adsorption process shows that the amount of alkyl sodium salt surfactant can directly affect the stability of microencapsulatedα-olefin polymer particles, and there must be a minimum critical amount of it.After characterization of the morphology by Scanning Electron Microscopy(SEM) and comparison of the static pressure stability,especially the conditions of reaction and technological control of microcapsules with different shell materials,microencapsulation of a-olefin polymer particles with poly-(urea-formaldehyde) as shell material was selected as the optimum scheme,because it can react under mild conditions and its technological process can be controlled in a large range.The relationship of drag reducing rate and dissolving time of microcapsules showed that the formation of microcapsules did not affect the maximum drag reducing rate,and the drag reducing rate of each sample can reach about 35%along with the dissolving time,i.e.microencapsulation did not affect the drag reducing property ofα-olefin polymer. 展开更多
关键词 α-olefin polymer molecular design coating material microcapsule preparation stability and solubility drag reducing property
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FePO4-coated Li[Li0.2Ni0.13Co0.13Mn0.54]O2 with improved cycling performance as cathode material for Li-ion batteries 被引量:4
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作者 Zhong Wang Hua-Quan Lu +5 位作者 Yan-Ping Yin Xue-Yi Sun Xiang-Tao Bai Xue-Ling Shen Wei-Dong Zhuang Shi-Gang Lu 《Rare Metals》 SCIE EI CAS CSCD 2017年第11期899-904,共6页
Li[Li0.2Ni0.13Coo.13Mn0.54]O2 cathode materials were synthesized by carbonate-based co-precipitation method, and then, its surface was coated by thin layers of FePO4. The prepared samples were characterized by X-ray d... Li[Li0.2Ni0.13Coo.13Mn0.54]O2 cathode materials were synthesized by carbonate-based co-precipitation method, and then, its surface was coated by thin layers of FePO4. The prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron micro- scope (FESEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The XRD and TEM results suggest that both the pristine and the coated materials have a hexagonal layered structure, and the FePO4 coating layer does not make any major change in the crystal structure. The FePO4-coated sample exhibits both improved initial discharge capacity and columbic efficiency compared to the pristine one. More significantly, the FePO4 coating layer has a much positive influence on the cycling perfor- mance. The FePO4-coated sample exhibits capacity reten- tion of 82 % after 100 cycles at 0.5℃ between 2.0 and 4.8 V, while only 28 % for the pristine one at the same charge-discharge condition. The electrochemical impe- dance spectroscopy (EIS) results indicate that this improved cycling performance could be ascribed to the presence of FePO4 on the surface of Li[Li0.2Ni0.13Co0.13Mno.54102 par- ticle, which helps to protect the cathode from chemical attacks by HF and thus suppresses the large increase in charge transfer resistance. 展开更多
关键词 Cathodes Charge transfer coated materials coatings Crystal structure Electric batteries Electrochemical impedance spectroscopy Electrodes Energy dispersive spectroscopy Field emission cathodes High resolution transmission electron microscopy Lithium Lithium alloys Lithium compounds Manganese Nickel Precipitation (chemical) Scanning electron microscopy Secondary batteries Transmission electron microscopy X ray diffraction
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Preparation of sulfur hydrophobized plasmonic photocatalyst towards durable superhydrophobic coating material 被引量:2
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作者 Emese Lantos LászlóMérai +5 位作者 ágota Deák Juan Gómez-Pérez Dániel Sebo?k Imre Dékány Zoltán Kónya LászlóJanovák 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第6期159-167,共9页
The widely used photocatalytic self-cleaning coating materials are often made of polymers and polymer based composites,where the photocatalyst immobilization occurs with macromolecules.However,these organic polymers a... The widely used photocatalytic self-cleaning coating materials are often made of polymers and polymer based composites,where the photocatalyst immobilization occurs with macromolecules.However,these organic polymers are often unstable under exposure to UV irradiation and easily degraded by reactive radicals produced in the photocatalytic reaction.In order to solve this problem,in this paper,we present the facile preparation of a multifunctional coating with dual superhydrophobic and photocatalytic properties,where the fixation and the hydrophobization of the plasmonic Ag-TiO2 photocatalyst particles with visible light activity was performed with non-water soluble sulfur,which is a cheap and easily available material.The resulted novel nanocomposite with rough and nano-tructured surface roughness(1.25–2.45 nm determined by small-angle X-ray scattering)has sufficient low surface energy(3.3 mJ/m2)for superhydrophobic(θ=151.1°v)properties.Moreover,in contrast of the organic and expensive fluoropolymer based composites,this non-wetting nature was durable,because the measured was higher than 150°during the long-term LED(λmax=405 nm)light irradiation. 展开更多
关键词 NANOCOMPOSITE coating materials WETTING Lotus-type structure Visible light photocatalyst
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Scaling relationships of elastic-perfectly plastic film/coating materials from small scale sharp indentation 被引量:2
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作者 WANG ZhaoXin WANG JiRu +5 位作者 WANG Wen Yang NIU YiHan LI Cong ZONG XiangYu ZHANG JianHai ZHAO HongWei 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2021年第6期1302-1310,共9页
The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a... The scaling relationships of elastic-perfectly plastic film/coating materials during sharp indentation have been obtained using dimensional analysis and finite-element modeling. Besides the bulk substrate materials, a wide range of film/coating materials with different ratios in term of the Young’s modulus and yield strength were examined, namely different values of Ef/Esand Yf/Es.Based on these scaling relationships, the substrate effects on indentation response and deformed surface profile of residual imprint are given. Furthermore, the scaling relationship among the work of indentation, reduced elastic modulus and hardness has been found. It is found that the ratio of the indentation hardness to measurement of substrate elastic modulus could be used to characterize the wear resistance of film/coating materials. In addition, a novel method to acquire the intrinsic hardness and elastic modulus of film/coating materials is proposed combined with the well-known 10% critical indentation depth rule, which avoids the error caused by estimating the contact area. This work could be contributed for characterizing the mechanical properties of film/coating materials at micro-and nanoscale. 展开更多
关键词 scaling relationships substrate effect dimensional analysis finite element modeling film/coating materials INDENTATION
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Glass formation in Fe-Cr-Zr-B-Mo alloys by tuning Nb addition 被引量:1
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作者 Cong-ran Fu Wei Zhang +4 位作者 Qing-chun Xiang Ying-dong Qu Ying-lei Ren Bo Yu Ke-qiang Qiu 《China Foundry》 SCIE CAS 2021年第5期450-456,共7页
Fe-based bulk metallic glasses(BMGs)with high boron content have potential application as a coating material used in the framework for storing spent nuclear fuels to support their safe long-term disposal.The high glas... Fe-based bulk metallic glasses(BMGs)with high boron content have potential application as a coating material used in the framework for storing spent nuclear fuels to support their safe long-term disposal.The high glass forming ability(GFA)and large supercooled liquid region are therefore required for such Fe-based BMGs in either the glassy powder fabrication or the subsequent coating spraying.In order to meet these requirements,the influence of Nb content on the GFA of Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(7-x)Nb_(x)(x=1-5,at.%)alloys was investigated,as Nb has positive roles in GFA and thermal stability of BMGs.The results indicate that a fully amorphous phase in the as-cast samples with 3 mm in diameter is obtained for both the Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(5)Nb_(2) and Fe_(57)Cr_(10)Zr_(8)B_(18)Mo_(4)Nb_(3) alloys.The corresponding supercooled liquid regions of the two BMGs are 78 K and 71 K,respectively.The mechanism for improving their GFA was analyzed based on the principle of metal solidification,the parameters for glass formation and thermal properties of the alloys.The compression strength and Vicker’s hardness of the two BMGs are 1,950 MPa and 1,310 HV,2,062 MPa and 1,180 HV,respectively.The developed BMGs with high B content,good GFA,and very high hardness can be used as coating materials to the framework for spent nuclear fuels. 展开更多
关键词 AMORPHOUS microstructure NB glass-forming ability coating material
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Semi-3D cultures using Laminin 221 as a coating material for human induced pluripotent stem cells
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作者 Yoshiki Nakashima Shinsuke Yoshida Masayoshi Tsukahara 《Regenerative Biomaterials》 SCIE EI 2022年第1期775-793,共19页
It was previously believed that human induced pluripotent stem cells(hiPSCs)did not show adhesion to the coating material Laminin 221,which is known to have specific affinity for cardiomyocytes.In this study,we report... It was previously believed that human induced pluripotent stem cells(hiPSCs)did not show adhesion to the coating material Laminin 221,which is known to have specific affinity for cardiomyocytes.In this study,we report that human mononuclear cell-derived hiPSCs,established with Sendai virus vector,form peninsular-like colonies rather than embryonic stem cell-like colonies;these peninsular-like colonies can be passaged more than 10 times after establishment.Additionally,initializationdeficient cells with residual Sendai virus vector adhered to the coating material Laminin 511 but not to Laminin 221.Therefore,the expression of undifferentiated markers tended to be higher in hiPSCs established on Laminin 221 than on Laminin 511.On Laminin 221,hiPSCs15M66 showed a semi-floating colony morphology.The expression of various markers of cell polarity was significantly lower in hiPSCs cultured on Laminin 221 than in hiPSCs cultured on Laminin 511.Furthermore,201B7 and 15M66 hiPSCs showed 3D cardiomyocyte differentiation on Laminin 221.Thus,the coating material Laminin 221 provides semi-floating culture conditions for the establishment,culture and induced differentiation of hiPSCs. 展开更多
关键词 human induced pluripotent stem cells(hiPSCs) regenerative medicine coating material CARDIOMYOCYTE therapeutic cells
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Fabrication of Fe–TiC–Al_2O_3 composites on the surface of steel using a TiO_2–Al–C–Fe combustion reaction induced by gas tungsten arc cladding
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作者 Mahmood Sharifitabar Jalil Vahdati Khaki Mohsen Haddad Sabzevar 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第2期193-204,共12页
The aim of the present study was to fabricate Fe-TiC-Al2O3 composites on the surface of medium carbon steel.For this purpose,TiO2-3C and 3TiO2-4Al-3C-xFe(0 ≤ x ≤ 4.6 by mole) mixtures were pre-placed on the surfac... The aim of the present study was to fabricate Fe-TiC-Al2O3 composites on the surface of medium carbon steel.For this purpose,TiO2-3C and 3TiO2-4Al-3C-xFe(0 ≤ x ≤ 4.6 by mole) mixtures were pre-placed on the surface of a medium carbon steel plate.The mixtures and substrate were then melted using a gas tungsten arc cladding process.The results show that the martensite forms in the layer produced by the TiO2-3C mixture.However,ferrite-Fe3C-TiC phases are the main phases in the microstructure of the clad layer produced by the 3TiO2-4Al-3C mixture.The addition of Fe to the TiO2-4Al-3C reactants with the content from 0 to 20wt%increases the volume fraction of particles,and a composite containing approximately 9vol%TiC and A12O3 particles forms.This composite substantially improves the substrate hardness.The mechanism by which Fe particles enhance the TiC + A12O3 volume fraction in the composite is determined. 展开更多
关键词 composite coatings iron-based materials combustion cladding microstructure microhardness
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Behavior of Deuterium in Boron Films Covered by Oxygen-Containing Layer
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作者 WANG Mingxu H. Miyauchi +4 位作者 T. Nakahata Y. Nishikawa Y. Oya N. Noda K. Okuno 《Southwestern Institute of Physics Annual Report》 2004年第1期50-51,共2页
Boron is an attractive candidate of the first wall coating materials in fusion reactors. The behavior of deuterium implanted into boron films has been studied . This paper reports the effect of thin oxygen-containing ... Boron is an attractive candidate of the first wall coating materials in fusion reactors. The behavior of deuterium implanted into boron films has been studied . This paper reports the effect of thin oxygen-containing boron layer on the behavior of deuterium im- planted into boron film by X-ray photoelectron spectroscopy (XPS) and thermal desorption spectroscopy (TDS). 展开更多
关键词 Boron films coating materials
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Plasma Sprayed NiAl Intermetallic Coating Produced with Mechanically Alloyed Powder 被引量:6
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作者 Mehrshad Moshref Javadi Hossein Edris Mahdi Salehi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2011年第9期816-820,共5页
In the present research, mechanically alloyed Ni-AI powder was utilized to develop plasma sprayed coatings, and the effect of the spray distance and heat treatment on the phases, microstructure, and hardness of the co... In the present research, mechanically alloyed Ni-AI powder was utilized to develop plasma sprayed coatings, and the effect of the spray distance and heat treatment on the phases, microstructure, and hardness of the coat- ings were examined. Coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and through microhardness measurements. Although mechanically alloyed Ni-AI powder showed no intermetallic phases, the coatings did. Different spray distances from 5 to 19 cm were employed for plasma spray and the specimens were heat treated at different temperatures, then the amount of oxides, porosity and hardness of the coatings were changed according to the spray condition. The thermal energy of the plasma spray caused the formation of NiAI phases while particles flew to the substrate or after that. Extreme increase in heat treatment temperature and spray distance resulted in oxidation and reduction in the quality of the coating. Furthermore, the best spray distance and heat treatment temperature to gain the NiAI intermetallic coating were established. 展开更多
关键词 coating materials INTERMETALLICS Phase transformation Plasma spray
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