α/γ相比率调控对超音速等离子喷涂Al_2O_3阻氚涂层微结构及性能的影响  

Microstructure and Property of Al_2O_3 Tritium Resistance Coating with Different Ratios of α/γ Phase Sprayed by Supersonic Atmospheric Plasma Spraying

作　　者：蒲国 刘波[1] 林黎蔚[1] PU Guo;LIU Bo;LIN Liwei(Key Laboratory of Radiation Physics and Technology of Ministry of Education,Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China)

机构地区：[1]四川大学原子核科学技术研究所教育部辐射物理及技术重点实验室,四川成都610064

出　　处：《原子能科学技术》2019年第3期465-470,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(11605116)

摘　　要：采用超音速等离子喷涂技术在中国低活化马氏体钢表面制备不同α/γ相比率的Al_2O_3阻氚涂层,研究了α/γ相比率调控对Al_2O_3涂层微观结构、力学性能和耐电化学腐蚀性能的影响。利用掠入射X射线衍射(GIXRD)和扫描电子显微镜(SEM)表征Al_2O_3涂层的微观结构、粘结拉伸试验法和纳米压痕仪表征涂层的力学性能、动电位极化曲线法测试涂层的耐电化学腐蚀性能。研究结果显示:通过调控特征喷涂参数(CPSP),Al_2O_3涂层中α相含量从78.6%至24.4%可控调节,且孔隙率从2.8%降低至1.5%;α相含量为78.6%的Al_2O_3涂层硬度为(11.500±0.575) GPa,约为高γ相含量(75.6%)涂层的2倍;且高α相含量(78.6%)涂层的腐蚀电流密度较高γ相含量(75.6%)涂层的腐蚀电流密度低1个数量级。以上结果表明,高α相含量(78.6%)的Al_2O_3涂层具有更优异的力学性能、耐电化学腐蚀性能以及耐Cl^-扩散穿透能力,具有应用于聚变堆结构材料表面阻氚涂层的潜能。Al2O3 tritium resistance coatings with different ratios of α/γ phase were sprayed on China low activation martensitic steels by supersonic atmospheric plasma spraying technology. The effects of ratio of α/γ phase on microstructures and properties of Al2O3 coatings were investigated. GIXRD and SEM were carried out to characterize the microstructures of the Al2O3 coatings, tensile test and nano-indentation test were performed to measure mechanical properties of the Al2O3 coating, and the potentiodynamic polarization method was performed to test the property of corrosion resistance. The results show that the content of α phase in the Al2O3 coating is controlled from 78.6% to 24.4% by adjusting the critical plasma spray parameters(CPSP). And the porosity of the Al2O3 coatings decreases from 2.8% to 1.5%. The hardness is(11.500±0.575) GPa of the sample with α phase content of 78.6%, which is about twice the hardness of the coating with γ phase content of 75.6%. Compared with the Al2O3 coating with γ phase content of 75.6%, the corrosion current density of Al2O3 coating with α phase content of 78.6% decreases by one order of magnitude. The above results indicate that the Al2O3 coating with high α phase content of 78.6% displays better mechanical properties, electrochemical corrosion resistance and Cl- diffusion penetration resistance, and possesses potential application in the tritium resistance coatings on the surface of structural materials of fusion reactor.

关 键 词：超音速等离子喷涂 Al2O3阻氚涂层 微结构 力学性能 耐电化学腐蚀性能 

分 类 号：TG156.88[金属学及工艺—热处理]