期刊文献+
共找到2,812篇文章
< 1 2 141 >
每页显示 20 50 100
Effects of plasma spraying process on microstructure and mechanical properties of Cr2AlC/410 composite coatings
1
作者 Yihu Ma Chaosheng Ma +1 位作者 Guozheng Ma Wenbo Yu 《High-Speed Railway》 2024年第2期110-115,共6页
To investigate the influences of Cr2AlC mass fraction and supersonic plasma spraying process on the microstructure and mechanical properties of Cr2AlC reinforced 410 stainless steel composite coatings,the coatings con... To investigate the influences of Cr2AlC mass fraction and supersonic plasma spraying process on the microstructure and mechanical properties of Cr2AlC reinforced 410 stainless steel composite coatings,the coatings containing different mass fractions of Cr2AlC were prepared and investigated.The composite coating exhibited low porosity and high adhesion strength.The addition of Cr2AlC significantly enhanced the hardness of the composite coatings through particle strengthening.However,when the mass fraction of Cr2AlC was 20%,the aggregation of Cr2AlC resulted in a strong decrease in the coating preparation efficiency,as well as a decline in adhesion strength.In the supersonic plasma spraying process,the Ar flow rate mainly influenced the flight velocity of the particles,while the H2 flow rate and the current mainly affected the temperature of the plasma torch.Consequently,all of them influenced the melting degree of particles and the quality of the coating.The lowest porosity and the highest hardness and adhesion strength could be obtained when the Ar flow rate is 125 L/min,the H2 flow rate is 25 L/min,and the current is 385 A. 展开更多
关键词 MAX phase plasma spray PARAMETER coating
下载PDF
HVOF-sprayed HAp/S53P4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants
2
作者 Carlos A.Poblano-Salas John Henao +6 位作者 Astrid L.Giraldo-Betancur Paola Forero-Sossa Diego German Espinosa-Arbelaez Jorge A.González-Sánchez Luis R.Dzib-Pérez Susana T.Estrada-Moo Idelfonso E.Pech-Pech 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期345-360,共16页
Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HA... Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro conditions.In the present work,75%wt.HAp-25%wt.S53P4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53P4 BG composite coatings on a bioresorbable AZ31 alloy.The study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those coatings.Different characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite coatings.The results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal expansion.It was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the coatings.In addition,in-vitro electrochemical studies were performed on the obtained HAp/S53P4 BG composite coatings and compared against the uncoated AZ31 alloy.The results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF). 展开更多
关键词 coatings Composites Thermal spray Temporary implants Hydrogen evolution
下载PDF
Study on the Attack of Molten Silicates on Plasma-Sprayed Thermal Barrier Coatings
3
作者 Roberto Fernando Martins Karl Friehe +3 位作者 Cecília Chaves Guedes e Silva Dolores Ribeiro Ricci Lazar Antônio Augusto Couto Carlos Roberto Camello Lima 《Journal of Minerals and Materials Characterization and Engineering》 2023年第5期115-130,共16页
Thermal barrier coating (TBC) revolutionized the industry by allowing higher operating temperatures for equipment, such as gas turbines in the aeronautical industry. However, at high temperatures, the TBC is exposed t... Thermal barrier coating (TBC) revolutionized the industry by allowing higher operating temperatures for equipment, such as gas turbines in the aeronautical industry. However, at high temperatures, the TBC is exposed to the attack of molten silicates, known as CMAS (Calcium-Magnesium-Alumino-Silicate), which are particles from the environment that infiltrate the TBC, causing delamination. In this study, samples coated with TBC by thermal spray and covered with CMAS were evaluated at temperatures of 1200˚C and 1250˚C. For each temperature, exposure times of 1 h and 5 h were used. Samples with longer exposure time had a considerable volume increase. The main contribution of this work was to demonstrate the non-wettability of the CMAS, even in the 5-h heat treatments, which prevented its infiltration in the deeper regions. The conditions to guarantee the formation of the silicate and its consequent wettability are also discussed. 展开更多
关键词 Thermal Barrier coatings Molten Silicates Thermal spray
下载PDF
Effects of Ce in novel bronze and its plasma sprayed coating 被引量:6
4
作者 李文生 刘毅 +2 位作者 王智平 马超 王顺才 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第9期2139-2145,共7页
A novel aluminum bronze over the Cu-Al binary alloy eutectoid Cu-14Al-4.5Fe was prepared by a jointly-charging one-melting technique and conventional sand casting. The bronze coatings were atmospherically plasma spray... A novel aluminum bronze over the Cu-Al binary alloy eutectoid Cu-14Al-4.5Fe was prepared by a jointly-charging one-melting technique and conventional sand casting. The bronze coatings were atmospherically plasma sprayed on the 45# medium carbon steel substrate. The effect of rare earth Ce on the microstructures and Vickers hardness of the cast alloy and coatings were characterized by scanning electron microscopy, X-ray diffraction, electronic probe microanalysis, transmission electron microscopy and microhardness measurements. The results indicate that the hardness of both as-cast alloy and coating are enhanced by the addition of 0.6% Ce due to the refinement of κ phases which are well distributed in the matrix. The rapid solidification in the plasma spray processing retains Fe-supersaturated in the Al-bronze alloy coatings, which avoids the formation of eutectoid (α+γ2) phase and stacking faults are found in the coatings with Ce added, accordingly improves the mechanical properties. 展开更多
关键词 rare earth CE aluminum bronze plasma spraying coating
下载PDF
HOT CORROSION OF A PLASMA SPRAYED CoNiCrAlTaSiY COATING
5
作者 杨涛 叶锐曾 +2 位作者 孙金贵 吕反修 李冰 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1995年第2期78+71-77,共8页
Hot corrosion(HC) of the APS(atomospheric plasma spraying)CoNiCrAlTaSiY coating on a nickel-base superalloy GH864 has been studied. The effect of laser-treatment on hot corrosion resistance was also examined.It was sh... Hot corrosion(HC) of the APS(atomospheric plasma spraying)CoNiCrAlTaSiY coating on a nickel-base superalloy GH864 has been studied. The effect of laser-treatment on hot corrosion resistance was also examined.It was shown that CoNiCrAlTaSiY coating had superior properties in resistance to hot corrosion due to the readiness of the formation of a protective Cr2O3 scale on the coating surface.A model for the mechanism of hot corrosion of this coating has been suggested. Hot corrosion resistance of this coating was significantly increased by the laser treatment simply because the surface of the as sprayed coating was densified by the high power laser beam. 展开更多
关键词 hot corrosion plasma spraying coating
下载PDF
Effect of TiO_2 content on properties of Al_2O_3 thermal barrier coatings by plasma spraying 被引量:14
6
作者 贾胜凯 邹勇 +2 位作者 徐计元 王静 余蕾 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期175-183,共9页
Al2O3 thermal barrier coatings with different TiO2 contents were deposited on 6061 aluminum alloy by plasma spraying. The corrosion resistance, thermal insulation property and phase composition of these coatings were ... Al2O3 thermal barrier coatings with different TiO2 contents were deposited on 6061 aluminum alloy by plasma spraying. The corrosion resistance, thermal insulation property and phase composition of these coatings were investigated. The results indicate that all the feedstock powders exhibit phase transformation during the spray process. With the increase of the TiO2 content in the powder, the corrosion resistance of the coating is enhanced but the thermal insulation property is decreased. This can be attributed to the higher thermal conductivity but lower melting point and brittleness of TiO2 than those of Al2O3, so it is easy for TiO2 to disperse in the brittle Al2O3 substrate during spraying, in which these dispersively distributed TiO2 play the role of hole sealing, releasing stress and reducing cracks. 展开更多
关键词 plasma spray corrosion resistance thermal insulation property phase transformation TiO2
下载PDF
A super wear-resistant coating for Mg alloys achieved by plasma electrolytic oxidation and discontinuous deposition 被引量:1
7
作者 Xixi Dong Mingxu Xia +4 位作者 Feng Wang Hailin Yang Gang Ji E.A.Nyberg Shouxun Ji 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第8期2939-2952,共14页
Magnesium alloys are lightweight materials with great potential,and plasma electrolytic oxidation(PEO)is effective surface treatment for necessary improvement of corrosion resistance of magnesium alloys.However,the∼1... Magnesium alloys are lightweight materials with great potential,and plasma electrolytic oxidation(PEO)is effective surface treatment for necessary improvement of corrosion resistance of magnesium alloys.However,the∼14µm thick and rough PEO protection layer has inferior wear resistance,which limits magnesium alloys as sliding or reciprocating parts,where magnesium alloys have special advantages by their inherent damping and denoising properties and attractive light-weighting.Here a novel super wear-resistant coating for magnesium alloys was achieved,via the discontinuous sealing(DCS)of a 1.3µm thick polytetrafluoroethylene(PTFE)polymer layer with an initial area fraction(A_(f))of 70%on the necessary PEO protection layer by selective spraying,and the wear resistance was exceptionally enhanced by∼5500 times in comparison with the base PEO coating.The initial surface roughness(Sa)under PEO+DCS(1.54µm)was imperfectly 59%higher than that under PEO and conventional continuous sealing(CS).Interestingly,DCS was surprisingly 20 times superior for enhancing wear resistance in contrast to CS.DCS induced nano-cracks that splitted DCS layer into multilayer nano-blocks,and DCS also provided extra space for the movement of nano-blocks,which resulted in rolling friction and nano lubrication.Further,DCS promoted mixed wear of the PTFE polymer layer and the PEO coating,and the PTFE layer(HV:6 Kg·mm^(−2),A_(f):92.2%)and the PEO coating(HV:310 Kg·mm^(−2),A_(f):7.8%)served as the soft matrix and the hard point,respectively.Moreover,the dynamic decrease of Sa by 29%during wear also contributed to the super wear resistance.The strategy of depositing a low-frictional discontinuous layer on a rough and hard layer or matrix also opens a window for achieving super wear-resistant coatings in other materials. 展开更多
关键词 Magnesium alloy coating plasma electrolytic oxidation Discontinuous deposition Wear resistance MECHANISM
下载PDF
Microstructure and corrosion resistance of Fe/Mo composite amorphous coatings prepared by air plasma spraying 被引量:9
8
作者 Chao-ping Jiang Ya-zhe Xing Feng-ying Zhang Jian-min Hao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第7期657-662,共6页
Fe/Mo composite coatings were prepared by air plasma spraying (APS) using Fe-based and Mo-based amorphous and nanocrys- talline mixed powders. Microstructural studies show that the composite coatings present a layer... Fe/Mo composite coatings were prepared by air plasma spraying (APS) using Fe-based and Mo-based amorphous and nanocrys- talline mixed powders. Microstructural studies show that the composite coatings present a layered structure with low porosity due to adding the self-bonded Mo-based alloy. Corrosion behaviors of the composite coatings, the Fe-based coatings and the Mo-based coatings were in- vestigated by electrochemical measurements and salt spray tests. Electrochemical results show that the composite coatings exhibit a lower polarization current density and higher corrosion potentials than the Fe-based coating when tested in 3.5wt% NaC1 solutions, indicating supe- rior corrosion resistance compared with the Fe-based coating. Also with the increase in addition of the Mo-based alloy, a raised corrosion re- sistance, inferred by an increase in corrosion potential and a decrease in polarization current density, can be found. The results of salt spray tests again show that the corrosion resistance is enhanced by adding the Mo-based alloy, which helps to reduce the porosity of the composite coatings and enhance the stability of the passive films. 展开更多
关键词 composite coatings plasma spraying AMORPHOUS corrosion resistance MICROSTRUCTURE
下载PDF
Plasma Spray Forming of Nanostructured Composite Coatings 被引量:7
9
作者 XianliangJIANG EricH.Jordan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第3期287-288,共2页
The nanostructure composite coating is obtained via plasma spraying of Al2O3-13 wt pct TiO2 powder. Brittle and hard lamella results from melted nanostructured powder. Ductile nanostructured matrix forms from unmelted... The nanostructure composite coating is obtained via plasma spraying of Al2O3-13 wt pct TiO2 powder. Brittle and hard lamella results from melted nanostructured powder. Ductile nanostructured matrix forms from unmelted nanostructured particles. Through the adjustment of constituent and nanostructure, hardness/strength and toughness/ductility are balanced and overall properties of the structure composite are achieved. 展开更多
关键词 plasma spray forming Nanostructured coating Mechanical Property
下载PDF
Effect of Thermal Treatment on the Grain Growth of Nanostructured YSZ Thermal Barrier Coating Prepared by Air Plasma Spraying 被引量:10
10
作者 王振波 周春根 +1 位作者 徐惠彬 宫声凯 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2004年第2期119-123,共5页
A nanostructured thermal barrier coating is prepared by air plasma spraying using the 8wt% Y_2O_3 partially stabilized zirconia nano-powder with an average grain size of 40 nm. The microstructure and phase composition... A nanostructured thermal barrier coating is prepared by air plasma spraying using the 8wt% Y_2O_3 partially stabilized zirconia nano-powder with an average grain size of 40 nm. The microstructure and phase composition of feedstock nano-powder and coating are investigated using SEM, TEM and XRD. It is found that the as-sprayed zirconia coating has an average grain size of 67 nm and mainly consistes of metastable tetragonal phase, together with some monoclinic phase and tetragonal phase. Thermal treatment results show that the grains of the nanostructured coating grow slightly below 900℃, whereas over 1000℃ the gains grow rapidly and monoclinic phase noticeably appeares. 展开更多
关键词 NANOSTRUCTURE thermal barrier coating air plasma spraying
下载PDF
Effect of Laser Remelting on the Microstructure and Corrosion Resistance of Plasma Sprayed Fe-based Coating 被引量:7
11
作者 姜超平 WANG Junxing +4 位作者 HAN Jianjun LU Yuan XING Yazhe CHEN Yongnan SONG Xuding 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第4期804-807,共4页
Fe-based amorphous and nanocrystalline coatings were fabricated by air plasma spraying. The coatings were further treated by laser remelting process to improve their microstructure and properties. The corrosion resist... Fe-based amorphous and nanocrystalline coatings were fabricated by air plasma spraying. The coatings were further treated by laser remelting process to improve their microstructure and properties. The corrosion resistance of the as-sprayed and laser-remelted coatings in 3.5wt% NaC1 and 1 mol/L HCI solutions was evaluated by electrochemical polarization analysis. It was found that laser-remelted coating appeared much denser than the as-sprayed coating. However, laser-remelted coating contains much more nanocrystalline grains than the as-sprayed coatings, resulting from the lower cooling rate in laser remelting process compared with plasma spraying process. Electrochemical polarization results indicated that the laser-remelted coating has great corrosion resistance than the as-sprayed coating because of its dense structure. 展开更多
关键词 plasma spraying coating laser remelting CORROSION
下载PDF
Deformation Behavior of Nanostructured Ceramic Coatings Deposited by Thermal Plasma Spray 被引量:4
12
作者 XianliangJIANG EricJordan +1 位作者 LeonShaw MauriceGell 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第4期479-480,共2页
Al2O3-13 wt pet TiO2 coating deposited by direct current plasma spray consists of nanostructured region and micro-lamellae. Bend test shows that the ceramic coating can sustain some deformation without sudden failure.... Al2O3-13 wt pet TiO2 coating deposited by direct current plasma spray consists of nanostructured region and micro-lamellae. Bend test shows that the ceramic coating can sustain some deformation without sudden failure. The deformation is achieved through the movement of nano-particles in the nanostructured region under tensile stress. 展开更多
关键词 NANOSTRUCTURE Ceramic coating Deformation mechanism Thermal plasma spray
下载PDF
Preparation and characterization of nanostructured Al_2O_3-13wt.%TiO_2 ceramic coatings by plasma spraying 被引量:4
13
作者 WANG Dongsheng TIAN Zongjun +2 位作者 SHEN Lida LIU Zhidong HUANG Yinhui 《Rare Metals》 SCIE EI CAS CSCD 2009年第5期465-470,共6页
Nanostructured and conventional Al2O3-13wt.%TiO2 ceramic coatings were prepared by plasma spraying with nanostructured agglomerated and conventional powders, respectively. The microstructure and microhardness of the c... Nanostructured and conventional Al2O3-13wt.%TiO2 ceramic coatings were prepared by plasma spraying with nanostructured agglomerated and conventional powders, respectively. The microstructure and microhardness of the coatings were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and microhardness measurement. Meanwhile, the friction and wear behaviors were analyzed and compared using a ball-on-disk tribometer. The results show that the conventional coating has lamellar stacking characteristic and has some pores. However, the nanostructured coating shows a bimodal microstructure, which is composed of both fully melted regions and partially melted regions. According to the microstructural difference, the partially melted regions can be divided into liquid-phase sintered regions (a three-dimensional net or skeleton-like structure: Al2O3-rich submicron particles embedded in the TiO2-rich matrix) and solid-phase sintered regions (remained nanoparticles). The microstructural characteristics of the liquid-phase sintered region are formed due to the selective melting of TiO2 nanoparticles during plasma spraying. On the other hand, the TiO2 and Al2O3 nanoparticles of the solid-phase sintered regions are all unmelted during plasma spraying. Due to the existence of nanostructured microstructures, the nanostructured coating has a higher microhardness, a lower friction coefficient, and a better wear resistance than the conventional coating. 展开更多
关键词 surface coating nanostructured coating plasma spraying MICROSTRUCTURE MICROHARDNESS wear resistance
下载PDF
Abrasive wear behavior of cast iron coatings plasma-sprayed at different mild steel substrate temperatures 被引量:4
14
作者 Ya-zhe Xing Qiu-lan Wei +1 位作者 Chao-ping Jiang Jian-min Hao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第8期733-738,共6页
Three kinds of cast iron coatings were prepared by atmospheric plasma spraying. During the spraying, the mild steel substrate temperature was controlled to be averagely 50, 180, and 240℃, respectively. Abrasive wear ... Three kinds of cast iron coatings were prepared by atmospheric plasma spraying. During the spraying, the mild steel substrate temperature was controlled to be averagely 50, 180, and 240℃, respectively. Abrasive wear tests were conducted on the coatings under a dry friction condition. It is ibund that the abrasive wear resistance is enhanced with the substrate temperature increasing. SEM observations show that the wear losses of the coatings during the wear tests mainly result from the spalling of the splats. Furthermore, the improved wear resis- tance of the coatings mainly owes to the formation of oxides and the enhancement in the mechanical properties with the substrate temperature increasing. 展开更多
关键词 cast iron coatingS plasma spraying wear bonding
下载PDF
High-temperature frictional wear behavior of MCrAlY-based coatings deposited by atmosphere plasma spraying 被引量:4
15
作者 Chong Tao Lei Wang Xiu Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第2期222-228,共7页
Al2O3-r2O03/NiCoCrAIYTa coatings were prepared via atmosphere plasma spraying (APS). The microstructure and phase com- position of the coatings were analyzed by X-ray diffraction (XRD), scanning electron microsco... Al2O3-r2O03/NiCoCrAIYTa coatings were prepared via atmosphere plasma spraying (APS). The microstructure and phase com- position of the coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser confocal scanning microsco- py (LSCM), and transmission electron microscopy (TEM). The dry frictional wear behavior of the coatings at 500℃ in static air was inves- tigated and compared with that of 0Cr25Ni20 steel. The results show that the coatings comprise the slatted layers of oxide phases, unmelted particles, and pores. The hot abrasive resistance of the coatings is enhanced compared to that of 0Cr25Ni20, and their mass loss is approxi- mately one-fifteenth that of 0Cr25Ni20 steel. The main wear failure mechanisms of the coatings are abrasive wear, fatigue wear, and adhe- sive wear. 展开更多
关键词 metal matrix composites composite coatings wear behavior high temperature properties plasma spraying
下载PDF
APPLICATION OF UNIFORM PRECRIPTION DESIGN IN STUDYING OF WEARREISTANT COATING IN PLASMA SPRAYING 被引量:3
16
作者 S.C. Fan 1) , X.H. Wang 2) , J.J. Zhang 2) and J.M. Wan 2) 1)School of Mechanical Engineering, Tianjin University, Tianjin 300070, China 2)School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期765-770,共6页
Plasma spraying technics, a method of strengthening surfaces, shows advantages in wear-resistant, reducing friction, bearing corrosion and enduring higher temperature. While for the coating material, it is important t... Plasma spraying technics, a method of strengthening surfaces, shows advantages in wear-resistant, reducing friction, bearing corrosion and enduring higher temperature. While for the coating material, it is important to improve the ability of the functional coating. In this paper, a coating material of wear-resistant, bearing corrosion and enduring higher temperature in middle and low speed diesel is studied quantificationally with a uniform prescription design method, which reduced the test period as the test points distribute uniformly. An optimized combination is put forward of each part in the coating and a method to develop a new coating material is supplied. 展开更多
关键词 coating uniform prescription design plasma sprayING
下载PDF
Crystallization behavior of plasma-sprayed lanthanide magnesium hexaaluminate coatings 被引量:3
17
作者 Liang-liang Huang Hui-min Meng Jing Tang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第12期1247-1253,共7页
LaMgAl11O19 thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of LaMgAl11O19 powders were researched. The results ... LaMgAl11O19 thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying. The crystallization behavior of the coatings and the synthesis mechanism of LaMgAl11O19 powders were researched. The results showed that the plasma-sprayed coatings conmined some amorphous phase, and LaMgAl11O19 powders were partially decomposed into Al2O3, LaAlO3, and MgAl2O4 in the plasma spraying process. The amorphous phase was reerystallized at a temperature of approximately 1174.9℃, at which level the decomposed Al2O3, LaAl2O3, and MgAl2O4 reacted again. The resynthesis temperature of LaMgAl11O19 in the plasma-sprayed coatings was lower than that of LaMgAl11O19 in the original raw powders. The synthesis mechanism of LaMgAl11O19 powders can be summarized as follows: during the first part of the overall reaction, La2O3 reacts with Al2O3 to form LaAl2O3 at approximately 900℃, and then LaAl2O3 further reacts with Al2O3 and MgAl2O4 to produce LaMgAl11O19 at approximately 1200℃. 展开更多
关键词 thermal barrier coatings HEXAALUMINATES plasma spraying CRYSTALLIZATION
下载PDF
Preparation of Ni60-WC Coating by Plasma Spraying, Plasma Re-melting and Plasma Spray Welding on Surface of Hot Forging Die 被引量:5
18
作者 王俊元 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第4期640-643,共4页
In order to produce the hear-resistant inner layer of hot-forging die, the plasma spraying and plasma re-melting and plasma spray welding were adopted. Substrate material was W6Mo5Cr4V2, including 10%, 20%, 30% tungst... In order to produce the hear-resistant inner layer of hot-forging die, the plasma spraying and plasma re-melting and plasma spray welding were adopted. Substrate material was W6Mo5Cr4V2, including 10%, 20%, 30% tungsten carbide (WC) ceramic powder used as coating material to obtain different Nickel-based WC alloys coating. Micro-structure and micro-hardness analysis of the coating layer are conducted, as well as thermophysical properties for the coating layer were measured. The experimental results show that the coating prepared with 70%Ni60, 30%WC powder has the best properties with plasma spray welding, in which the micro-hardness can achieve 900HV, meanwhile it can improve the thermal property of hot-forging die dramatically. 展开更多
关键词 hot forging die plasma spraying plasma re-melting plasma spray welding thermo physical properties Ni60-WC
下载PDF
Salt spray corrosion test of micro-plasma oxidation ceramic coatings on Ti alloy 被引量:3
19
作者 HAO Guodong YAO Zhongping JIANG Zhaohua 《Rare Metals》 SCIE EI CAS CSCD 2007年第6期560-564,共5页
Ceramic coatings were prepared on Ti-6Al-4V alloy in NaAlO2 solution by micro-plasma oxidation (MPO). The salt spray tests of the coated samples and the substrates were carded out in a salt spray test machine. The p... Ceramic coatings were prepared on Ti-6Al-4V alloy in NaAlO2 solution by micro-plasma oxidation (MPO). The salt spray tests of the coated samples and the substrates were carded out in a salt spray test machine. The phase composition and surface morphology of the coatings were investigated by XRD and SEAM. Severe corrosion occurred on the substrate surface, while there were no obvious corrosion phenomena on the coated samples. The coatings were composed of Al2TiO5 and a little α-Al2O3 and mille TiO2, and the salt spray test did not change the composition of the coatings. The weight loss rate of the coatings decreased with increasing MPO time because of the increase in density and thickness of the coatings. The surface morphology of the coatings was influenced by salt spray corrosion test. Among the coated samples, the coating prepared for 2 h has the best corrosion resistance under salt spray test. 展开更多
关键词 micro-plasma oxidation ceramic coating salt spray corrosion test Ti alloy
下载PDF
Thickness measurement approach for plasma sprayed coatings using ultrasonic testing technique 被引量:7
20
作者 LIN Li LI Xi-meng XU Zhi-hui LEI Ming-kai 《中国有色金属学会会刊:英文版》 CSCD 2004年第z1期88-91,共4页
The special ultrasonic testing system has been developed for thickness measurement of plasma sprayed coatings. The ultrasonic immersion method was used to obtain stable coupling condition and avoid other disadvantages... The special ultrasonic testing system has been developed for thickness measurement of plasma sprayed coatings. The ultrasonic immersion method was used to obtain stable coupling condition and avoid other disadvantages of contact method. Spherical acoustic lens were designed to focus ultrasonic beam so as to improve beam directivity and concentrate ultrasonic energy. To increase testing precision and avoid mussy wave signals, moderate pulse width and frequency of the transducer has been selected. The displacement of transducer in X-Y-Z directions was precisely manipulated by step-controlled system to insure the accuracy of focus length and repetition of measurement. Optimized testing conditions (with the transducer of center frequency of 10 MHz and crystal diameter of 8 mm, focus length of 9.5 mm, diameter of focal column of 0. 1 mm and length of focal column of 0.27 mm) were selected to determine the thickness between 285 -414 μm of ZrO2 coatings plasma sprayed on the nickel based superalloy. The frequency interval of the periodic extremums in ultrasonic power spectra decreases with increasing coating thickness. The ultrasonic results accord with those of metallographical method. 展开更多
关键词 plasma sprayED coatingS thickness MEASUREMENT ULTRASONIC testing INTERFERENCE
下载PDF
上一页 1 2 141 下一页 到第
使用帮助 返回顶部