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Microstructure and mechanical properties of Mg-3Sn-1Ca reinforced with AlN nano-particles
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作者 Shaozhu Wang Yuanding Huang +7 位作者 Lixiang Yang Ying Zeng Yaozeng Hu Xiao Zhang Qiang Sun Shaojun Shi Guangyao Meng Norbert Hort 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第1期259-269,共11页
Microstructural evolution and strengthening mechanisms of Mg-3Sn-1Ca based alloys with additions of different amounts of Al N nanoparticles were investigated.It was found that with increasing the amount of AlN nano-pa... Microstructural evolution and strengthening mechanisms of Mg-3Sn-1Ca based alloys with additions of different amounts of Al N nanoparticles were investigated.It was found that with increasing the amount of AlN nano-particles the grain size decreases obviously.The existence of AlN nano-particles could refine the primary crystal phases CaMgSn,which provided more heterogeneous nucleation sites for the formation of magnesium.Moreover,such nano-particles could also restrict the grain growth during solidification.After adding AlN nano-particles,both the tensile properties at room temperature and high temperature 250℃and the hardness are largely improved.The improvement of strength is attributed to grain refinement and second phase refinement. 展开更多
关键词 Mg-Sn-Ca alloy AlN nano-particles Microstructure Strengthening mechanisms Grain refinement
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Microstructure and Oxidation Behaviors of Nano-particles Strengthened NiCoCrAlY Cladded Coatings on Superalloys 被引量:12
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作者 WANG Hongyu ZUO Dunwen +2 位作者 CHEN Xinfeng YU Shouxin GU Yuanzhi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2010年第3期297-304,共8页
Nano-particles which can largely improve the microstructure and oxidation resistance of materials are often used as a strengthening component in metal matrix composites. However, few studies were reported on its appli... Nano-particles which can largely improve the microstructure and oxidation resistance of materials are often used as a strengthening component in metal matrix composites. However, few studies were reported on its application in the bond coat of duplex structure thermal barrier coating(TBC). Three kinds of NiCoCrAlY coatings strengthened by different nano-particles with the same addition (1%, mass fraction) were prepared by the laser cladding technique on Ni-based superalloy substrates, aiming to study the effects of the nano-particles on microstructure and oxidation resistance of NiCoCrAlY coatings (the bond coat of the duplex structure thermal barrier coatings). Scanning electron microscope (SEM), X-ray diffractometer(XRD) and thermogravimetry were employed to investigate their morphologies, phases and cyclic oxidation behaviors in atmosphere at 1 050℃, compared with the coating without nano-particles. With the addition of nano-particles, the growth pattern of the grains at the interface changed from epitaxial growth to non-epitaxial growth or part-epitaxial growth; slender dendrites were broken and cellularized; cracks and pores were restrained; and the oxidation weight-gain and the stripping resistance of the oxide scale were improved as well. Among the three kinds of nano-particles, the SiC nano-particles showed the most improvement on microstructure, while the CeO2 nano-particles were insufficient, but its effects on the oxidation resistance are the same as those of the SiC nano-particles. Based on the discussions of the influence mechanism, it is believed that CeO2 nano-particles would show better improvement than SiC nano-particles if the proper amount is added and the proper preparation technique of micro-nanometer composite powders is adopted, with the synergistic action of nanometer effect and reactive element effect. 展开更多
关键词 high-temperature protective coating nano-particlE MICROSTRUCTURE cyclic oxidation laser cladding
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Surface tension of lithium bromide aqueous solution/ammonia with additives and nano-particles 被引量:2
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作者 蔡伟华 孔伟伟 +2 位作者 王悦 朱蒙生 王新雷 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第5期1979-1985,共7页
In order to investigate the effect of additives and nano-particle on the surface tensions of lithium bromide(Li Br) aqueous solution/ammonia, many experiments were carried out based on Wilhelmy plate method. Firstly, ... In order to investigate the effect of additives and nano-particle on the surface tensions of lithium bromide(Li Br) aqueous solution/ammonia, many experiments were carried out based on Wilhelmy plate method. Firstly, the surface tension of Li Br aqueous solution with 1-octanol was measured and then the comparison between the measured results and previous experimental results was given to verify the measuring accuracy. Some new additives, such as cationic surfactants cetyltrimethyl ammonium chloride(CTAC), and cetyltrimethyl ammonium bromide(CTAB) were chosen in the experiments. The experimental results show that CTAC and CTAB can obviously reduce the surface tension of Li Br aqueous solution/ammonia. In addition, it is found that nano-particles cannot remarkably decrease the surface tension of Li Br aqueous solution/ammonia. However, the mixed addition of additives and nano-particles can remarkably affect the surface tension of Li Br aqueous solution/ammonia. That is to say, additives play more important role in reducing the surface tension of Li Br aqueous solution/ammonia. But nano-particles may enhance the heat transfer in the absorption refrigeration process. 展开更多
关键词 lithium bromide AMMONIA ADDITIVES nano-particles surface tension
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Influence of SiO_2 nano-particles on microstructures and properties of Ni-W-P/CeO_2-SiO_2 composites prepared by pulse electrodeposition 被引量:2
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作者 王军丽 徐瑞东 章俞之 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第5期839-843,共5页
Ni-W-P base composites containing CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by pulse co-deposition of Ni,W,P,CeO2 and SiO2 nano-particles.The influence of SiO2 concentrations in bath on... Ni-W-P base composites containing CeO2 and SiO2 nano-particles were prepared on common carbon steel surface by pulse co-deposition of Ni,W,P,CeO2 and SiO2 nano-particles.The influence of SiO2 concentrations in bath on microstructures and properties of Ni-W-P/CeO2-SiO2 composites was studied,and the characteristics were assessed by chemical compositions,element distribution,surface morphologies,deposition rate and microhardness.The results indicate that when SiO2 concentration in bath is controlled at 20 g/L,the composites possess the fastest deposition rate,the highest microhardness,compact microstructures,smaller crystallite sizes and uniform distribution of W,P,Ce and Si within Ni-W-P matrix metal.Increasing SiO2 concentration in bath from 10 to 20 g/L leads to the refinement in grain size and the inhomogeneity of microstructures.While when SiO2 concentration is increased to 30 g/L,the crystallite sizes increase again and some bosses with nodulation shape appear on the surface of composites. 展开更多
关键词 pulse electrodeposition nano-particlE composite microstructure and property
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Preparation and Characterization of Fe3O4 Magnetic Nano-particles by ^(60)Co γ-ray Irradiation 被引量:2
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作者 Mingcheng YANG Hongyan SONG +2 位作者 Chengshen ZHU Suqin HE Ya GAO 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期182-184,共3页
By using a new method, ^60Co γ-ray irradiation, Fe3O4 magnetic nano-particles were successfully synthesized at room temperature under ambient pressure. The structure, morphology and magnetic properties of these nanop... By using a new method, ^60Co γ-ray irradiation, Fe3O4 magnetic nano-particles were successfully synthesized at room temperature under ambient pressure. The structure, morphology and magnetic properties of these nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM), respectively. The radiation formation mechanism was also discussed. The results show that the absorbed dose can greatly influence the structure, morphology and magnetic properties of the products. XRD and TEM studies show that the product prepared by γ-ray irradiation (10 kGy) is pure FesO4 phase and the mean diameter of these nano-particles is about 21 nm. The Fe3O4 nano-particles synthesized by γ-ray irradiation (10 kGy) are mainly in small cubic shape and the size uniformity of these particles is good. 展开更多
关键词 ^60Co γ-ray IRRADIATION Fe304 nano-particles Super-paramagnetism
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Pressure-Induced Structural Transitions of the Zinc Sulfide Nano-particles with Different Sizes 被引量:1
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作者 Yuewu PAN Jie YU +3 位作者 Zhan HU Hongdong LI Qiliang CUI Guangtian ZOU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期193-195,共3页
ZnS nano-particles with average sizes of 10 nm and 5 nm were fabricated by sol-gel method, and their pressure-induced phase transformations were in-situ examined in a diamond anvil cell by energy dispersive X-ray diff... ZnS nano-particles with average sizes of 10 nm and 5 nm were fabricated by sol-gel method, and their pressure-induced phase transformations were in-situ examined in a diamond anvil cell by energy dispersive X-ray diffraction (EDXD) from ambient pressure to 35.0 GPa. From the obtained interplanar spacing data,the volume compression ratios were derived at different pressures, and then the bulk modulus and its pressure derivative were obtained by fitting to the Murnaghan equation. It is found that both ZnS nano-particles initially in the zinc-blende phase transformed to cubic NaCl structure in the presence of pressure and the transition was reversible when the pressure was released. Moreover, it is suggested that a smaller particle size will induce a larger transition pressure. 展开更多
关键词 nano-particles ZNS Phase transformations Synchrotron radiation
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Friction and Wear of Polymer Composites Filled by Nano-Particles: A Review 被引量:2
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作者 Ayman A. Aly El-Shafei B. Zeidan +2 位作者 AbdAllah A. Alshennawy Aly A. El-Masry Wahid A. Wasel 《World Journal of Nano Science and Engineering》 2012年第1期32-39,共8页
Composites formed by adding nano-scale particles to a polymer matrix results in improving electrical, mechanical, and thermal properties of the composite. Good tribological properties can be obtained for polymers fill... Composites formed by adding nano-scale particles to a polymer matrix results in improving electrical, mechanical, and thermal properties of the composite. Good tribological properties can be obtained for polymers filled with nano-scale fillers compared to that filled with micro-scale particles. The friction and wear resistance of these composites is found to increase with increasing filler concentration. It is also possible to use multi-functional fillers to develop high performance composites which cannot be achieved by using a single filler. 展开更多
关键词 FRICTION WEAR POLYMER COMPOSITES nano-particles
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Crystallization characteristics of Ni-W-P composite coatings reinforced by CeO_2 and SiO_2 nano-particles 被引量:2
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作者 徐瑞东 翟大成 章俞之 《Journal of Central South University》 SCIE EI CAS 2014年第12期4424-4431,共8页
Ni-W-P composite coatings reinforced by Ce O2 and Si O2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase str... Ni-W-P composite coatings reinforced by Ce O2 and Si O2 nano-particles on the surface of common carbon steels, were prepared by double pulse electrodeposition. The crystallization course was characterized by phase structures, crystallinity, grain sizes and microstructures. The results indicate that as-deposited composite coating is amorphous. Whereas it turns into the crystalline structure with 98.25% crystallinity, and Ni3 P, Ni2 P and Ni5P2 alloy phases precipitate from structures at 400 °C. Thereafter, Ni2 P and Ni5P2 metastable alloy phases turn into Ni3 P stable alloy phase at 500 °C. The crystallization course of the composite coating has finished when being heat-treated at 700 °C. The average sizes of Ni grains increase with the rise of heat treatment temperature from400 °C to 700 °C. Ce O2 and Si O2 nano-particles deposited into Ni-W-P alloys can delay the crystallization course and habit the growth of alloy phases. 展开更多
关键词 composite coating double pulse electrodeposition Ni-W-P nano-particles crystallization characteristics
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Conditions for laser-induced plasma to effectively remove nano-particles on silicon surfaces 被引量:1
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作者 韩敬华 罗莉 +2 位作者 张玉波 胡锐峰 冯国英 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期423-428,共6页
Particles can be removed from a silicon surface by means of irradiation and a laser plasma shock wave.The particles and silicon are heated by the irradiation and they will expand differently due to their different exp... Particles can be removed from a silicon surface by means of irradiation and a laser plasma shock wave.The particles and silicon are heated by the irradiation and they will expand differently due to their different expansion coefficients,making the particles easier to be removed.Laser plasma can ionize and even vaporize particles more significantly than an incident laser and,therefore,it can remove the particles more efficiently.The laser plasma shock wave plays a dominant role in removing particles,which is attributed to its strong burst force.The pressure of the laser plasma shock wave is determined by the laser pulse energy and the gap between the focus of laser and substrate surface.In order to obtain the working conditions for particle removal,the removal mechanism,as well as the temporal and spatial characteristics of velocity,propagation distance and pressure of shock wave have been researched.On the basis of our results,the conditions for nano-particle removal are achieved. 展开更多
关键词 laser-induced plasma shock wave nano-particles surface cleaning
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Electronic spin susceptibility of metallic superconductive nano-particles
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作者 李凤 陈志谦 李庆 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第5期1075-1080,共6页
We have observed the thermodynamic properties of metallic superconductive nano-particles in the grand canonical ensemble; and the level distribution and the level correlation between the discrete electronic energy lev... We have observed the thermodynamic properties of metallic superconductive nano-particles in the grand canonical ensemble; and the level distribution and the level correlation between the discrete electronic energy levels are considered in the calculation of the electronic spin susceptibility of the ensemble numerically. The quantum effect, even-odd effect and other special effects existing in the metallic nano-particles are also studied in this article. 展开更多
关键词 nano-particles random matrices theory spin susceptibility
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Heat-Affected Behavior of the Magnetic Properties of Iron Nano-Particles
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作者 柳刚 吕楠 +2 位作者 秦伯雄 范荣焕 郭院波 《Transactions of Tianjin University》 EI CAS 2004年第2期85-90,共6页
The high surface energy makes metal nano-particles reactive and easy to get oxidized or burned in the open air, which results in decreasing or entirely losing their functions and properties. In this paper, the magneti... The high surface energy makes metal nano-particles reactive and easy to get oxidized or burned in the open air, which results in decreasing or entirely losing their functions and properties. In this paper, the magnetic property behavior of iron nano-particle, which is one kind of the typical magnetic nano-materials, has been investigated. The iron nano-particles were heated to different temperatures in an open-air stove. After that, they were firstly examined by TEM to observe the changes of their outline of shapes and then measured by VSM to trace the changes of their magnetic properties. The test results show that iron nano-particles can keep their magnetic property with saturation magnetic induction intensity Bs around 136—161 emu/g,remanent magnetic induction intensity Br around 14.8—17.4 emu/g and coercive force Hc around 290—302 Oe when the temperature goes up to 523 K. The explanation to such outstanding oxidization-proof ability has been given that there exists a single crystal and lattice-shared Gamma-Fe2O3 shell covering the pure iron core, which prevents the spherical iron nano-particles from further oxidization. 展开更多
关键词 nano-particles magnetic properties thermal behavior
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Improvement of the Conductivity of Silver Nanowire Film by Adding Silver Nano-Particles
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作者 沈奕 姚若河 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第3期115-117,共3页
The change of conductivity and transparency of silver nanowire (AgNW) films by adding silver nano-particles (AgNPs) onto their surface is studied. The results show that the conductivity of the AgNW film is greatly... The change of conductivity and transparency of silver nanowire (AgNW) films by adding silver nano-particles (AgNPs) onto their surface is studied. The results show that the conductivity of the AgNW film is greatly improved with its sheet resistance reduced about 78. 7% to 51.9Ω/sq, and there is no obvious reduction of the transmittance. Further studies show that there is a self-assembling process pushing the AgNPs to concentrate at the intersecting points between AgNWs to weld them, which would reduce the intersection resistance between the AgNWs. This self-assembling behavior is led by the surface interactivities among the dispersing liquid of AgNPs, the surface of the substrate and AgNWs when the dispersing liquid is drying. 展开更多
关键词 of on is it by Improvement of the Conductivity of Silver Nanowire Film by Adding Silver nano-particles were
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γ-Fe Nano-particles from Fe(CO)_5 by CW CO_2 Laser-driven
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作者 Xinqing ZHAO Yong LIANG +1 位作者 Keshen XIAO Feng ZHENG and Zhuangqi HU (State Key Lab. of RSA, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1994年第2期148-150,共3页
γ-Fe nano-particles with size of 20-40 nm were produced by SF6-sensitized CW CO2 laser-induced gaseous pyrolysis of Fe(Co) 5, The γ-Fe stabte in reaction zone at above 910℃ was formed.The rapid quenching prevents f... γ-Fe nano-particles with size of 20-40 nm were produced by SF6-sensitized CW CO2 laser-induced gaseous pyrolysis of Fe(Co) 5, The γ-Fe stabte in reaction zone at above 910℃ was formed.The rapid quenching prevents from the γ-Fe transforming to α-Fe as rapidly cooling from high temperature to room temperature, The characteristics of the particles were examined at room temperature by TEM. electron diffraction and XRD. It was proved that about 70% of γ-Fe phase in the particles was present. In addition. the lattice constant of the γ-Fe was 0.364 nm in place of 0.360 nm 展开更多
关键词 Fe nano-particles from Fe by CW CO2 Laser-driven NANO CO CW
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Lubrication Mechanism of Micro/Nano-particles on Sialon
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作者 张文光 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第B10期5-7,共3页
The tribological properties of Sialon sliding against AISI52100 steel ball under the lubrication of solid particle additives, as micro-borate particle and nano-PbS particle, were evaluated by a SRV ball-on-disc test r... The tribological properties of Sialon sliding against AISI52100 steel ball under the lubrication of solid particle additives, as micro-borate particle and nano-PbS particle, were evaluated by a SRV ball-on-disc test rig. The chemical composition of the worn surface was characterized by X-ray photoelectron spectroscopy (XPS). The morphologies of the worn surfaces of Sialon were analyzed by scanning electron microscopy (SEM). The results show that the particles can reduce the friction coefficient of the pairs and the wear volume of Sialon significantly. The wear resistance of micro-borate is superior to that of nano-PbS while the friction-reducing ability of PbS is better than that of borate. According to the XPS and SEM results, the wear resistance of PbS is mainly depended on the tribochemical film mainly composed of PbSO 4, which deposited on the worn surface with good bonding strength. No tribochemical reaction or deposited film was detected or observed on the worn surface of Sialon under the lubrication of borate, indicating that the possible physically deposited film generated from micro particle can also greatly reduce the wear volume of Sialon, though the friction reducing ability of which is inferior to that of nano PbS particle. 展开更多
关键词 sialon ceramic micro/nano-particle ADDITIVE lubrication mechanism
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Hydrothermal Fabrication of Rod-like Rutile Nano-Particles
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作者 José M F Ferreira 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期112-,共1页
Rutile phase exhibits higher refractive index and h id ing power, good chemical stability, and is becoming a candidate material for the high-temperature separation and catalysis applications. The thermodynamically sta... Rutile phase exhibits higher refractive index and h id ing power, good chemical stability, and is becoming a candidate material for the high-temperature separation and catalysis applications. The thermodynamically stable feature of rutile among the three polymorphs of TiO 2 usually hinders ob taining nano-sized rutile phase by a conventional calcining way. However, acid peptization of amorphous TiO 2 is favorable to the formation of rutile phase. I n this work, well-crystallized and well-dispersed rod-like rutile particles w ith specific surface areas of 49.1 and 35.0 m 2/g were prepared by hydrothermal ly treating the acid peptized TiO 2 amorphous sols at relatively low temperatur es of 200 ℃ or 240 ℃, respectively. The formation of non-touching rutile part icles is attributed to high long-range electrostatic forces between particles i n the presence of the high concentration of the peptizer. The acid peptization w ould easily break the ≡Ti-O-Ti≡ bonds to form ≡Ti-OH or HO-Ti-OH species depending on the amount of acid, and create conditions for the formation of rut ile nuclei after structural rearrangements. 展开更多
关键词 TIO Hydrothermal Fabrication of Rod-like Rutile nano-particles
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Comparison of PVDF porous membranes modified by two different methods using composite nano-particles
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作者 赵晴 时文歆 +2 位作者 于水利 吕慧 芦艳 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第6期751-755,共5页
To improve the hydrophilicity and anti-fouling performance in water treatment,both entrapped method and deposited method were used to modify polyvinylidene fluoride(PVDF)porous membrane with composite Al2O3/TiO2 nano-... To improve the hydrophilicity and anti-fouling performance in water treatment,both entrapped method and deposited method were used to modify polyvinylidene fluoride(PVDF)porous membrane with composite Al2O3/TiO2 nano-particles.Neat PVDF membrane was prepared and its property was also compared with that of the modified membranes.Membrane permeation flux and anti-fouling performance were measured using a membrane cell.The contact angle between water and membrane surface was detected in order to denote the membrane hydrophilicity.Membrane morphology and surface structure were examined by atomic-force microscopy(AFM)and scanning electron microscopy(SEM).Experimental results showed that modified membranes had higher permeation fluxes than that of the neat PVDF membrane.The addition of nano-particles altered membrane surface morphology and increased surface roughness.Due to the hydrophilicity of nano-particles,however,the membrane anti-fouling performance was improved instead of worsened.The entrapped membrane exhibited better anti-fouling performance than the deposited membrane and the neat membrane. 展开更多
关键词 PVDF MEMBRANE entrapped METHOD deposited METHOD COMPOSITE nano-particles MEMBRANE FOULING
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PREPARATION OF CdS NANO-PARTICLES IN MIXED SURFACTNT VESICLE SYSTEM
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作者 Guo Xi ZHAO and Wang Lin YU(The Institute of Physical Chemistry, Peking University, Beijing 100871) 《Chinese Chemical Letters》 SCIE CAS CSCD 1994年第12期1071-1074,共4页
CdS particles were generated in the mixed sodium 10- undecenoate--decyltrmethylammonium bromide vesicle dispersions.Depending on the condition and method of preparation. CdSsemi conductor absorption edges were found... CdS particles were generated in the mixed sodium 10- undecenoate--decyltrmethylammonium bromide vesicle dispersions.Depending on the condition and method of preparation. CdSsemi conductor absorption edges were found to range from 526 to 448 nm, corresponding to particle diameter between >5. 0 and 2. 7 nm. 展开更多
关键词 CDS PREPARATION OF CdS nano-particles IN MIXED SURFACTNT VESICLE SYSTEM
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Lichen-Based Nano-Particles, an Emerging Antibacterial Approach
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作者 Taswar Ahsan Liu He +2 位作者 Yu Miao Bingxue Li Yuanhua Wu 《Journal of Materials Science and Chemical Engineering》 2021年第8期10-20,共11页
Bacterial pathogens produced resistance against the existing antimicrobial applications. Scientist trending towards the potent novel eco-friendly and cost effective antimicrobial approaches and fabricating bio-based n... Bacterial pathogens produced resistance against the existing antimicrobial applications. Scientist trending towards the potent novel eco-friendly and cost effective antimicrobial approaches and fabricating bio-based nano-particles. In this regard, several bio-materials have been investigated, such as, bacteria, fungi, algae, lichens and green plants. Lichens are introduced as an emerging source to synthesis bio-based nano-particles. The lichen-based metal nano-materials, especially fabricated by applying green chemistry strategies, have resulted significant alternates to traditional antimicrobial applications. Several studies break out and revealed that lichen-based nano-particle showed strong antimicrobial efficacy, as the lichens are biologically compatible. Current review summarizes an overview of lichen-based nano-materials, their fabrication, their applications, and their molecular action mechanism. As it emerged a broad spectrum antimicrobial agent for pharmaceutical and agricultural applications. 展开更多
关键词 LICHENS nano-particles ANTIMICROBIAL
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Effect of Aluminum Nano-Particles on Microrelief and Dielectric Properties of PE+TlInSe<sub>2</sub>Composite Materials
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作者 E. M. Gojayev Kh. R. Ahmadova +2 位作者 S. I. Safarova G. S. Djafarova Sh. M. Mextiyeva 《Open Journal of Inorganic Non》 2015年第1期11-19,共9页
The paper presents the results of studies surface microrelief, frequency-temperature characteristics of the imaginary part of the dielectric permittivity and dielectric loss of PE+TlInSe2 composite materials in 25。C ... The paper presents the results of studies surface microrelief, frequency-temperature characteristics of the imaginary part of the dielectric permittivity and dielectric loss of PE+TlInSe2 composite materials in 25。C - 150。C temperature and 25 Hz - 1 MHz frequency range before and after application of the aluminum nano-particles with a size of 50 nm. The change in the amount of semicon-ductor filler TlInSe2 and aluminum nano-particles changes the state of the surface and the frequency-temperature characteristics of composite materials PE+xvol.%TlInSe2, which allows to obtain composites with the desired dielectric permittivity and dielectric loss. 展开更多
关键词 Surface MICRORELIEF ALUMINUM nano-particles DIELECTRIC Permeability Tangent of the Angle DIELECTRIC Loss
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Catalytic Decomposition of Nitric Oxide by LaCoO3 Nano-particles Prepared by Rotary CVD
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作者 徐鹏 涂溶 +4 位作者 ZHANG Song YANG Meijun LI Qizhong GOTO Takashi ZHANG Lianmeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第2期368-374,共7页
Catalytic direct decomposition of NO by perovskite-type catalysts has attracted much attention for the various possible components and the unique structure. LaCoO_3 nanoparticles were precipitated on a-Al_2O_3 micro p... Catalytic direct decomposition of NO by perovskite-type catalysts has attracted much attention for the various possible components and the unique structure. LaCoO_3 nanoparticles were precipitated on a-Al_2O_3 micro powders by rotary chemical vapor deposition(rotary CVD) and its catalytic performance for the decomposition of NO was investigated. LaCoO_3 nano-particles with 100 nm in average diameter and 1.5% in mass were uniformly dispersed on a-Al_2O_3 powder. The conversion of NO increased with increasing temperature from 400 to 950 ℃, and reached 28.7% at 950 ℃. The gas velocity of transformed NO on LaCoO_3 nano-particles catalyst per mass unit was 7.7 mL/(g min), showing a good catalytic activity over the calculated results of pure catalysts. After five times of aging performance experiments, the NO conversion kept the same value, showing a good aging performance and thermal stability. 展开更多
关键词 rotary chemical vapor deposition LaCoO3 nano-particles NO decomposition catalyst
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