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镁合金基体超音速等离子喷涂Al-Al_(2)O_(3)复合涂层组织与耐腐蚀性能研究
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作者 任东亭 王文权 +2 位作者 张新戈 杜文博 朱胜 《材料导报》 EI CAS CSCD 北大核心 2024年第16期207-213,共7页
镁合金的耐腐蚀性能差,在工程应用中往往因腐蚀而发生失效,通过表面工程技术对镁合金进行表面改性或防护,是工程应用中采用的重要手段。本工作采用超音速等离子喷涂(Supersonic plasma spray,SPS)工艺在AZ61镁合金表面制备Al-Al_(2)O_(3... 镁合金的耐腐蚀性能差,在工程应用中往往因腐蚀而发生失效,通过表面工程技术对镁合金进行表面改性或防护,是工程应用中采用的重要手段。本工作采用超音速等离子喷涂(Supersonic plasma spray,SPS)工艺在AZ61镁合金表面制备Al-Al_(2)O_(3)复合涂层,其中Al_(2)O_(3)的质量分数分别为30%、50%和70%(下文简称AA30、AA50、AA70)。研究了Al_(2)O_(3)含量对Al-Al_(2)O_(3)复合涂层微观组织、孔隙率、电化学性能以及盐雾耐腐蚀性能的影响。结果表明,涂层的表面呈现熔滴铺展堆叠形成的浪花状形貌,粉末熔化充分,涂层内部结合紧密,各涂层均由Al、α-Al_(2)O_(3)和γ-Al_(2)O_(3)三种物相组成。AA70涂层的孔隙率较AA30和AA50明显升高,达到了6.71%;电化学极化试验研究表明,各涂层比AZ61镁合金基体表现出更高的电极电位和较低的自腐蚀电流密度,AZ61镁合金基体自腐蚀电流密度为5.144 mA·m^(-2),而AA30、AA50和AA70的自腐蚀电流密度分别为2.950 mA·m^(-2)、3.084 mA·m^(-2)和2.496 mA·m^(-2),三种涂层相比母材AZ61表现出较低的电化学腐蚀速率。电化学阻抗测试结果表明,三种涂层的R ct达到了AZ61镁合金基体的两倍左右,显示出较低的阳极溶解活性。在盐雾试验中,AZ61镁合金基体产生大量的腐蚀产物和龟裂纹;涂层AA30和AA50由于腐蚀产物的积累产生了大量裂纹,在涂层与基体的界面处发生了电偶腐蚀,最终随着基体表面的腐蚀,涂层产生了剥落;涂层AA70腐蚀程度最小,表现出最佳的抗腐蚀性能。 展开更多
关键词 超音速等离子喷涂 al-al_(2)o_(3)复合涂层 镁合金 孔隙率 耐腐蚀性能
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Al_(2)O_(3)在储能材料中的应用研究进展
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作者 王妍 魏诗诗 +2 位作者 赵昊雯 李健 王甲泰 《电源技术》 CAS 北大核心 2024年第8期1533-1540,共8页
Al_(2)O_(3)作为陶瓷材料、催化剂、催化剂载体及研磨磨料等有广泛的应用。因氧化铝具有优良的抗酸碱腐蚀性和力学等性能且热稳定性好、来源丰富,所以近年来逐渐开始应用在储能材料领域,进一步拓展了氧化铝的应用范围。主要针对氧化铝... Al_(2)O_(3)作为陶瓷材料、催化剂、催化剂载体及研磨磨料等有广泛的应用。因氧化铝具有优良的抗酸碱腐蚀性和力学等性能且热稳定性好、来源丰富,所以近年来逐渐开始应用在储能材料领域,进一步拓展了氧化铝的应用范围。主要针对氧化铝包覆后的二次储能电池正极材料、负极材料,以及改进隔膜的力学性能等方面进行研究。报道了近年来氧化铝在锂离子电池、钠离子电池、锂硫电池、电解液、隔膜方面的应用研究进展。 展开更多
关键词 储能材料 电极材料 al2o3 改性 电化学性能
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Modification of Nano-α-Al2O3 and Its Influence on the Surface Properties of Waterborne Polyurethane Resin Composite Passivation Films
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作者 Jiankang Fu Changshuai Ma +2 位作者 Yameng Zhu Jing Yuan Qianfeng Zhang 《Journal of Materials Science and Chemical Engineering》 2024年第5期29-48,共20页
Silane coupling agent KH560 was used to modify the surface of nano-α-Al<sub>2</sub>O<sub>3</sub> in ethanol-aqueous solution with different proportions. The particle size of nano-α-Al<sub&... Silane coupling agent KH560 was used to modify the surface of nano-α-Al<sub>2</sub>O<sub>3</sub> in ethanol-aqueous solution with different proportions. The particle size of nano-α-Al<sub>2</sub>O<sub>3</sub> was determined by nano-particle size analyzer, and the effects of nano-α-Al<sub>2</sub>O<sub>3</sub> content, ethanol-aqueous solution ratio and KH560 dosage on the dispersion and particle size of nano-α-Al<sub>2</sub>O<sub>3</sub> were investigated. The material structure before and after modification was determined by Fourier transform infrared spectroscopy (FTIR). Aqueous polyurethane resin and inorganic components are combined with modified nano-α-Al<sub>2</sub>O<sub>3</sub> dispersion to form chromium-free passivation solution. The solution is coated on the galvanized sheet, the adhesion and surface hardness are tested, the bonding strength of the coating and the surface hardness of the substrate are discussed. The corrosion resistance and surface morphology of the matrix were investigated by electrochemical test, neutral salt spray test and scanning electron microscope test. The chromium-free passivation film formed after the modification of nano-α-Al<sub>2</sub>O<sub>3</sub> increases the surface hardness of galvanized sheet by about 85%. The corrosion resistance of the film is better than that of a single polyurethane film. The results show that the surface hardness and corrosion resistance of polyurethane resin composite passivation film are significantly improved by the introduction of nano-α-Al<sub>2</sub>O<sub>3</sub>. 展开更多
关键词 Micro-Nano α-al2o3 Waterborne Polyurethane Resin Particle Size Surface Hardness Corrosion Resistance
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Influence of pyrolytic carbon coatings on complex permittivity and microwave absorbing properties of Al_2O_3 fiber woven fabrics 被引量:5
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作者 丁冬海 周万城 +1 位作者 罗发 朱冬梅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期354-359,共6页
The pyrolytic carbon (PyC) coatings were fabricated on A1203 fiber fabrics by the method of chemical vapor deposition (CVD). The microstructures of A1203 fibers with and without PyC coatings were characterized by ... The pyrolytic carbon (PyC) coatings were fabricated on A1203 fiber fabrics by the method of chemical vapor deposition (CVD). The microstructures of A1203 fibers with and without PyC coatings were characterized by SEM and Raman spectroscopy. The influence of deposition time of PyC on the DC conductivity (ad) of A1203 filaments and complex permittivity of fabrics at X band (8.2-12.4 GHz) were investigated. The values of Crd and complex permittivity increase with increasing deposition time of PyC. The electron relaxation polarization and conductance loss were supposed to be contributed to the increase of ε' and ε", respectively. In addition, the reflection loss (RL) of fabrics was calculated. The results show that the microwave absorbing properties of Al2O3 fiber fabrics can be improved by PyC coatings. The best RL results are for 60 min-deposition sample, of which the minimum value is about -40.4 dB at about 9.5 GHz and the absorbing frequency band (AFB) is about 4 GHz. 展开更多
关键词 complex permittivity pyrolytic coating al2o3 fiber fabric
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Interface characteristics of Al_2O_3-13%TiO_2 ceramic coatings prepared by laser cladding 被引量:3
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作者 高雪松 田宗军 +1 位作者 刘志东 沈理达 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2498-2503,共6页
Al2O3-13%TiO2 (mass fraction) coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and cer... Al2O3-13%TiO2 (mass fraction) coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and ceramic coating were characterized by SEM, XRD and EDS. The results show that two-layer substructure exists in the ceramic coating: one layer evolving from fully melted region where the sintered grains grow fully; another layer resembling the liquid-phase-sintered structure consisting of three-dimensional net where the melted Al2O3 particles are embedded in the TiO2-rich matrix. The mechanism of the two-layer substructure formation is also explained in terms of the melting and flattening behavior of the powders during laser cladding processing. The spinel compounds NiAl2O4 and acicular compounds Cr2O3 are discovered in the interface between bond coating and ceramic coating. It proves that the chemical reactions in the laser cladding process will significantly enhance the coating adhesion. 展开更多
关键词 ceramic coating nickel alloy laser cladding al2o3-Tio2 high frequency induction
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Impedance spectroscopy study of high-temperature oxidation of Gd_2O_3-Yb_2O_3 codoped zirconia thermal barrier coatings 被引量:2
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作者 张丹华 郭洪波 宫声凯 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第5期1061-1067,共7页
3Gd2O3-3Yb2O3-4Y2O3 (mole fraction, %) co-doped ZrO2 (GY-YSZ) thermal barrier coatings (TBCs) were produced by electron beam physical vapor deposition (EB-PVD). The oxidation behavior of GY-YSZ at 1 050 ℃ was... 3Gd2O3-3Yb2O3-4Y2O3 (mole fraction, %) co-doped ZrO2 (GY-YSZ) thermal barrier coatings (TBCs) were produced by electron beam physical vapor deposition (EB-PVD). The oxidation behavior of GY-YSZ at 1 050 ℃ was investigated using impedance spectroscopy (IS) combined with scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffractometry (XRD). Various electrical responses observed in the impedance spectra corresponding to GY-YSZ grains and grain boundaries were explained using circuit modeling. The change in the conduction mechanism of GY-YSZ was found to be related to the O^2- vacancy and lattice distortion due to the stabilizer diffusion during the oxidation. The results also suggested that the specific oxidation information about the GY-YSZ grains and grain boundaries should be acquired at a moderate measurement temperature, which was related to the resistance value in the impedance spectra. The resistance values of the GY-YSZ grains and grain boundaries should be measured at 200 ℃ and 300 ℃, respectively. 展开更多
关键词 rare earth oxide GD2o3 YB2o3 thermal barrier coatings (TBCs) oXIDATIoN impedance spectroscopy (IS)
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Preparation of Al_2O_3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel 被引量:1
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作者 高俊国 陆峰 +2 位作者 汤智慧 王长亮 何业东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2491-2497,共7页
Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employ... Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure. 展开更多
关键词 al2o3/Au composite coatings magnetron sputtering oxidation resistance spallation resistance
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Tribological behavior and mechanism of NiCrBSi-Y_2O_3 composite coatings 被引量:1
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作者 蔡滨 谭业发 +2 位作者 谭华 敬奇锋 张中威 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2002-2010,共9页
The NiCrBSi-Y2O3 composite coatings were prepared on the surface of 45 carbon steel by plasma spray, the microstructure and tribological properties of the coatings were investigated. The results show that the NiCrBSi-... The NiCrBSi-Y2O3 composite coatings were prepared on the surface of 45 carbon steel by plasma spray, the microstructure and tribological properties of the coatings were investigated. The results show that the NiCrBSi-Y2O3 composite coatings are mainly composed of γ-Ni, CrB, Cr7C3 and Y2O3. With addition of Y2O3, hard phases such as CrB, Cr7C3 emerge in composite coating, and the density of the composite coatings also increases. The NiCrBSi-0.5Y2O3 composite coating presents excellent tribological properties. Its friction coefficient is 0.175, which is about 37% of that of the pure NiCrBSi coating. The mass wear loss is 1.2 mg, which is reduced by 43% compared with the pure NiCrBSi coating. When the loads are 6-10 N, the NiCrBSi-0.5Y2O3 composite coating suffers from slight wear and the wear mechanisms are mainly adhesive wear accompany with slight micro-cutting wear and micro-fracture wear. As the load increases to 12 N, the wear mechanisms are adhesive wear and severe micro-cutting wear. 展开更多
关键词 plasma spray composite coating NICRBSI Y2o3 friction WEAR
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INVESTIGATION ON MICROSTRUCTURE AND TRIBOLOGICAL PROPERITIES OF CORED WIRE ARC SPRAYED Al/Al _2 O_3 COATINGS 被引量:7
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作者 Y.L.Zhu,S.N.Ma,C.H.Yang and R.F.Fu Surface Engineering Research Inst., CMES, Beijing 100072,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期988-994,共7页
Cored wires for electric arc spraying of Al/Al 2 O 3 MMC coatings were developed, with Al 2 O 3 powder as the core material and commercial aluminium strip as the retaining sheath. The bond strength, ... Cored wires for electric arc spraying of Al/Al 2 O 3 MMC coatings were developed, with Al 2 O 3 powder as the core material and commercial aluminium strip as the retaining sheath. The bond strength, Al 2 O 3 content, microstructure, micro-hardness and wear resistance of coatings produced by arc spraying of the cored wires were experimentally investigated and were compared with those of pure aluminum coating. 展开更多
关键词 al 2 o 3 aluminium coating arc spray cored wire
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Microstructure of nanometer Al_2O_3 dispersion strengthened Ni-based high-temperature protective coatings by laser cladding 被引量:9
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作者 王宏宇 左敦稳 +2 位作者 孙玉利 徐锋 张丹 《中国有色金属学会会刊:英文版》 EI CSCD 2009年第3期586-591,共6页
The nanometer Al2O3 dispersion strengthened NiCoCrAlY high-temperature protective coatings by crosscurrent CO2 laser on Ni-based superalloy GH4033 were produced. Microscopic morphologies, phase constitutions of claddi... The nanometer Al2O3 dispersion strengthened NiCoCrAlY high-temperature protective coatings by crosscurrent CO2 laser on Ni-based superalloy GH4033 were produced. Microscopic morphologies, phase constitutions of cladding coatings and distribution of nano-Al2O3 particles were examined using SEM and XRD. The results show that the interface grains, after adding proper nano-Al2O3, grow from epitaxial to non-epitaxial shape gradually, and the columnar dendrites become thinner and denser with cellular shape. Cracks in the substrate close to the interface are eliminated. Moreover, dispersive nano-Al2O3 particles mainly distribute around cellular substructure and on grain-boundaries, which prevents the diffusion of alloying elements and restrains the formation of new phase. There is a critical value of nano-Al2O3 addition, and the most suitable content of nano-Al2O3 is 1% (mass fraction) in this experimental conditions. The "nanometer effect" of nano-Al2O3 particles plays an important role in the improvement of coating microstructure. 展开更多
关键词 纳米al2o3 NICoCRalY 高温防护涂层 弥散强化 激光熔覆 微观结构 al2o3微粒 al2o3颗粒
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Preparation of Al2O3 nanowires on 7YSZ thermal barrier coatings against CMAS corrosion 被引量:7
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作者 Xiao-feng ZHANG Shao-peng NIU +5 位作者 Zi-qian DENG Min LIU Hong LI Chun-ming DENG Chang-guang DENG Ke-song ZHOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第11期2362-2370,共9页
The commonly-employed material for thermal barrier coatings(TBCs)is 7 wt.%Y2O3 ZrO2(7YSZ),generally deposited by electron beam-physical vapor deposition(EB-PVD).Due to the increasing demand for higher operating temper... The commonly-employed material for thermal barrier coatings(TBCs)is 7 wt.%Y2O3 ZrO2(7YSZ),generally deposited by electron beam-physical vapor deposition(EB-PVD).Due to the increasing demand for higher operating temperature in aero-derivative gas turbines,a lot of effort has been made to prevent the premature failure of columnar 7YSZ TBCs,which is induced by the microstructure degradation,sintering and spallation after the deposition of infiltrated siliceous mineral(consisting of calcium magnesium aluminum silicate(CaO MgO Al2O3 SiO2,i.e.,CMAS)).A new method called Al-modification for columnar 7YSZ TBCs against CMAS corrosion was present.The Al film was magnetron-sputtered on the surface of the columnar 7YSZ TBCs,followed by performing vacuum heat treatment of the Al-deposited TBCs.During the heat treatment,the molten Al reacted with ZrO2 to formα-Al2O3 overlay that effectively hindered CMAS infiltration.Moreover,the Al film could evaporate and re-nucleate,leading to the generation of Al2O3 nanowires,which further restrained the moving of molten CMAS. 展开更多
关键词 thermal barrier coating CMAS corrosion al-modification al2o3 nanowires
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Effect of MoSi_2 content on dielectric and mechanical properties of MoSi_2/Al_2O_3 composite coatings 被引量:5
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作者 WU Zhi-hong ZHOU Wan-cheng +1 位作者 LUO Fa ZHU Dong-mei 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期111-116,共6页
Molybdenum disilicide (MoSi2) sheath and aluminum oxide (Al2O3) core blended powders were fabricated by spray drying. A derived coating material was produced for the application as microwave absorbers using the as... Molybdenum disilicide (MoSi2) sheath and aluminum oxide (Al2O3) core blended powders were fabricated by spray drying. A derived coating material was produced for the application as microwave absorbers using the as prepared powders by atmospheric plasma spray (APS) technology. The effects of MoSi2/Al2O3 mass ratio on the dielectric and physical mechanical properties of the composite coatings were investigated. When the MoSi2 content of the composites increases from 0 to 45%, the flexure strength and fracture toughness improve from 198 to 324 MPa and 3.05 to 4.82 MPa-m1/2 then decline to 310 MPa and 4.67 MPa-m1/2, respectively. The dielectric loss tangent increases with increasing MoSi2 content, and the real part of permittivity decreases conversely over the frequency range of 8.2-12.4 GHz. These effects are due to the agglomeration of early molten MoSi2 particles and the increase of the electrical conductivity with increasing MoSi2 content. 展开更多
关键词 MoSi2/al2o3 composite coating atmospheric plasma spraying mechanical properties dielectric properties
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Laser Remelting of Plasma Sprayed NiCrAlY and NiCrAlY-Al_2O_3 Coatings 被引量:4
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作者 Yingna WU, Gang ZHA NC, Bingchun ZHANG, Zhongchao FENG and Yong LIANG Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Fangjun LIU Key Laboratory for High Energy Density Beam Processing Technology, Beijing Aeronautical Manu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第5期525-528,共4页
Two types of plasma sprayed coatings (NiCrAlY and NiCrAlY-A12O3) were remelted by a 5 kW cw CO2 laser. With increasing laser power and decreasing traverse speed in the ranges of 200-700 W and 5-30 mm/s respectively, t... Two types of plasma sprayed coatings (NiCrAlY and NiCrAlY-A12O3) were remelted by a 5 kW cw CO2 laser. With increasing laser power and decreasing traverse speed in the ranges of 200-700 W and 5-30 mm/s respectively, the melted track grew in width and depth. In the optimum range of laser parameters, a homogeneous remelted layer without voids, cavities, unmelted particles and microcracks was formed. On the surface of remelted layers, Al203 and YAIO3 were detected. As a result of isothermal oxidation tests, weight gains of laser remelted coatings were obviously lower than that only plasma sprayed, especially laser remelted NiCrAlY-Al2O3 coatings. The effects of laser remelting and incorporation of A12O3 second phase in N1CrAlY matrix on high temperature oxidation resistance were discussed. 展开更多
关键词 Ni Laser Remelting of Plasma Sprayed NiCralY and NiCralY-al2o3 coatings TBCS al
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Fabrication and characterization of Al_2O_3-metal composite coating on steel plate with nonpressure combustion synthesis 被引量:3
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作者 Chang-Hao Wang Ze-Hua Wang +3 位作者 Ze-Hua Zhou Shao-Qun Jiang Xiao-Feng Xue Jing-Jing Yao 《Rare Metals》 SCIE EI CAS CSCD 2013年第4期390-396,共7页
Al2O3-metal composite coatings with different reactants and diluents were fabricated on mild steel plate with nonpressure combustion synthesis process. The coat-ings were characterized by means of X-ray diffraction, s... Al2O3-metal composite coatings with different reactants and diluents were fabricated on mild steel plate with nonpressure combustion synthesis process. The coat-ings were characterized by means of X-ray diffraction, scanning electron microscopy, and energy-dispersive spec-trometry, respectively. Thermal shock tests were carried out to determine the bond strength of the coating with the steel substrate. The results indicate that the coating is composed of α-A1203, α-(Fe-Cr) and Al2SiO5 as the main phases. It is found that the coating with the diluents of Al2O3-SiO2 and transition layer of Al2O3-Cr presents the hi.ghest hardness of 2270 HV0.2 and the lowest porosity of 3.93 %. Owing to a metallurgical bond of the coating-to-substrate, the coating exhibits a good thermal shock resistance. 展开更多
关键词 Combustion synthesis al2o3-metalcomposite coating DILUENTS Thermal shock resistance
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Preparation and tribological performance of electrodeposited Ni-TiB_2-Dy_2O_3 composite coatings 被引量:3
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作者 刘小珍 李昕 +1 位作者 余艾冰 黄玮珏 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第3期480-485,共6页
TiB2 and Dy2O3 were used as codeposited particles in the preparation of Ni-TiB2-Dy2O3 composite coatings to improve its performance. Ni-TiB2-Dy2O3 composite coatings were prepared by electrodeposition method with a ni... TiB2 and Dy2O3 were used as codeposited particles in the preparation of Ni-TiB2-Dy2O3 composite coatings to improve its performance. Ni-TiB2-Dy2O3 composite coatings were prepared by electrodeposition method with a nickel cetyltrimethylammonium bromide and hexadecylpyridinium bromide solution containing TiB2 and Dy2O3 particles. The content of codeposited TiB2 and Dy2O3 in the composite coatings was controlled by adding TiB2 and Dy2O3 particles of different concentrations into the solution, respectively. The effects of TiB2 and Dy2O3 content on microhardness, wear mass loss and friction coefficients of composite coatings were investigated. The composite coatings were characterized by X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometer (ICP-AES) and scanning electron microscopy (SEM) techniques. Ni-TiBE-Dy2O3 composite coatings showed higher microhardness, lower wear mass loss and friction coefficient compared with those of the pure Ni coating and Ni-TiB2 composite coatings. The wear mass loss of Ni-TiB2-Dy2O3 composite coatings was 9 and 1.57 times lower than that of the pure Ni coating and Ni-TiB2 composite coatings, respectively. The friction coefficient of pure Ni coating, Ni-TiB2 and Ni-TiB2-Dy2O3 composite coatings were 0.723, 0.815 and 0.619, respectively. Ni-TiBE-Dy2O3 composite coatings displayed the least friction coefficient among the three coatings. Dy2O3 particles in composite coatings might serve as a solid lubricant between contact surfaces to decrease the friction coefficient and abate the wear of the composite coatings. The loading-bearing capacity and the wear-reducing effect of the Dy2O3 particles were closely related to the content of Dy2O3 particles in the composite coatings. 展开更多
关键词 ELECTRoDEPoSITIoN composite coatings nickel TIB2 Dy2o3 friction and wear rare earths
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Comparative study on corrosion behavior of plasma sprayed Al_2O_3, ZrO_2, Al_2O_3/ZrO_2 and ZrO_2/Al_2O_3 coatings 被引量:2
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作者 S.SATHISH M.GEETHA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第5期1336-1344,共9页
ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings were fabricated on low carbon steel using atmospheric plasma spraying technique. The microstructure and phase composition of the as-sprayed coatings were examined by sca... ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings were fabricated on low carbon steel using atmospheric plasma spraying technique. The microstructure and phase composition of the as-sprayed coatings were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The polarization test, salt spray test and immersion test were used to investigate the corrosion behavior of the coatings in 3.5% NaCl solution. The results suggested that the bilayered Al2O3/ZrO2 coating exhibits superior corrosion resistance when compared with the other coatings. This is ascribed to the presence of very few interconnected pores and stable phases in the coating. 展开更多
关键词 bilayered coating al2o3 ZRo2 atmospheric plasma spraying corrosion
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Damage Mechanism of Al_2O_3 Ceramic Coatings Irradiated by CO_2 CW Laser 被引量:2
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作者 李东荣 王富耻 +2 位作者 马壮 王全胜 柳彦博 《Journal of Beijing Institute of Technology》 EI CAS 2008年第2期227-231,共5页
Rules and mechanism of damage in Al2O3 coatings irradiated by CO2 CW laser are studied in order to improve the ability of parts of equipment standing against the high power laser. Al2O3 coatings were sprayed by air pl... Rules and mechanism of damage in Al2O3 coatings irradiated by CO2 CW laser are studied in order to improve the ability of parts of equipment standing against the high power laser. Al2O3 coatings were sprayed by air plasma spray(APS) on the 45^# steel substrate, and then were irradiated by CO2 CW laser from 795 W/cm^2 to 31 830 W/cm^2. As the output power of the laser is increasing, its porosity is increasing and cracks are appearing and spreading quickly, And also the phase will transform from γ-Al2O3 to a-Al2O3 in the damaged areas. When the energy density is 17 507 W/cm^2, the coatings are destroyed completely. The thermal infection field on substrate is rather small. The laser energy is depleted by the phase transformation and cracks in Al2O3 coatings during the laser thermal shock. 展开更多
关键词 CW laser plasma spray al2o3 coatings demolishment
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Catalytic graphitization of polyacrylonitrile(PAN)-based carbon fibers with Fe-Cr_2O_3 composite coating 被引量:3
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作者 黄振华 周海晖 +2 位作者 彭奇龄 陈金华 旷亚非 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第8期1418-1423,共6页
The process of electrodepositing Fe-Cr2O3 composite coating on polyacrylonitrile (PAN)-based carbon fibers and its catalytic graphitization were studied. Carbon fibers with and without electrodeposited Fe-Cr2O3 comp... The process of electrodepositing Fe-Cr2O3 composite coating on polyacrylonitrile (PAN)-based carbon fibers and its catalytic graphitization were studied. Carbon fibers with and without electrodeposited Fe-Cr2O3 composite coating were heat treated at different temperatures and the structural changes were characterized by XRD, Raman spectroscopy and SEM. The results indicate that Fe-Cr2O3 composite coating exhibits a significant catalytic effect on graphitization of carbon fibers at low temperatures. When the Fe-Cr2O3-coated carbon fibers were heat treated at 1 300℃ the interlayer spacing (doo2) and ratio of relative peak area (AD/AG) reach 3.364/k and 0.34, respectively. Whereas, the extent of graphitization of pristine carbon fibers is comparatively low even after heat treatment at 2 800℃ and the values of doo2 and AD/AG are 3.414 A and 0.68, respectively. The extent of graphitization of carbon fibers increases not only with the increase of the catalyst gross but also the Cr2O3 content in Fe-Cr2O3 coating. The catalytic effect of Fe-Cr2O3 composite coating accords with the dissolution-precipitation mechanism. 展开更多
关键词 carbon fiber catalytic graphitization Fe-Cr2o3 coating
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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 被引量:3
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作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation (PEO) on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.: The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation (PEO) on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.: The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 al-12Si alloys yttrium ion plasma electrolytic oxidation Zro2-Y2o3 ceramic coating
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Fe-Cr-Y_2O_3 MICRO-CRYSTALLINE COATINGS DEPOSITED BY SERIES ELECTRO-PULSE DISCHARGE 被引量:3
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作者 Q. Xu,Y.D. He,D.R. Wang,H.B. Qi,Z.W. Li and W.Gao Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, China Department of Chemical and Material Engineering, The University of 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第4期331-338,共8页
A new technique-series electro-pulse discharge (SEPD)-was developed as a sur-face coating process. In this technique, both positive and negative poles of a pulse power were used as the depositing electrodes with the s... A new technique-series electro-pulse discharge (SEPD)-was developed as a sur-face coating process. In this technique, both positive and negative poles of a pulse power were used as the depositing electrodes with the substrate alloy as an induction electrode. Fe-Cr and Fe-Cr-Y2O3 micro-crystalline coatings were deposited on stain-less steel (Fe-18Cr-8Ni) surfaces. Oxidation at 950℃ in ambient air showed that the coatings greatly improved the oxidation resistance of the steel. The addition of dis-persed Y2O3 nano-particles into the alloy coatings was found to further reduce the scaling rate and enhance the adhesion of oxide scales. 展开更多
关键词 series electro-pulse discharge Fe-Cr-Y2o3 micro-crystalline al-loy coating high-temperature oxidation
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