渗碳处理对等离子喷涂TaC涂层结构和物相组成的影响  

Effect of Carburizing Treatment on Microstructure and Phase Composition of TaC Coating Prepared by Plasma Spray

作　　者：洪督 黄利平[1] 黄山松[1] 钟鑫 石旻昊 丁毅 牛亚然[1] 郑学斌[1] Hong Du;Huang Liping;Huang Shansong;Zhong Xin;Shi Minhao;Ding Yi;Niu Yaran;Zheng Xuebin(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《热喷涂技术》2023年第2期13-18,共6页Thermal Spray Technology

摘　　要：TaC涂层在还原气氛下能耐酸、碱、盐等物质的腐蚀,是优异的表面防护涂层材料。本文结合喷雾干燥与等离子球化技术制备TaC粉体,并采用真空等离子喷涂技术制备TaC涂层。采用真空碳管炉对涂层进行渗碳处理,比较研究不同渗碳温度对涂层结构和物相组成的影响。结果发现,相较于喷雾造粒,等离子球化处理的TaC粉体呈致密球形,该粉体制备的涂层较为致密,孔隙率较低。此外,喷涂过程中TaC发生脱碳产生Ta_(2)C相,而渗碳反应可以将喷涂过程中产生的Ta_(2)C相转化成TaC相。Ta_(2)C与C反应生成TaC的过程受动力学控制,当渗碳温度超过900℃时,几乎完全转化为TaC相。TaC coating has excellent corrosion resistance to acid,alkali and salt in reducing atmosphere,which is a good protection coating material.The spherical TaC powders were fabricated by spray drying and induction plasma spherodization(IPS),and the TaC coatings were prepared by vacuum plasma spray(VPS)technology.The TaC coatings were carburized by carbon tube furnace,and the influence of carburizing temperature on the microstructure and phase composition of TaC coating was studied.The results showed that the TaC powders fabricated by IPS were denser and more spherical compared with spray drying.The corresponding TaC coating was also dense and had a low porosity.In addition,TaC decarburized and generated some Ta_(2)C in spraying process,while Ta_(2)C was converted into TaC by carburization.Ta_(2)C reacted with C to form TaC,which was influenced by dynamics,and almost all Ta_(2)C was converted into TaC over 900℃.

关 键 词：TAC Ta_(2)C 等离子喷涂 渗碳 

分 类 号：TG174.4[金属学及工艺—金属表面处理]