高频感应辅助燃烧合成Ti-Al涂层及其性能研究  

Properties of Ti-Al coating synthesized by high-frequency induction-assisted combustion technique

作　　者：潘成刚[1] 赵新[1] 史记 房成洁 马开江 任鸿鑫 Pan Chenggang;Zhao Xin;Shi Ji;Fang Chengjie;Ma Kaijiang;Ren Hongxin(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Wuhan Ruike Fiber Laser Technology Co.,Ltd.,Wuhan 430233,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点试验室,湖北武汉430081 [2]武汉锐科光纤激光技术股份有限公司,湖北武汉430233

出　　处：《武汉科技大学学报》2022年第5期335-341,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(57135353).

摘　　要：采用高频感应辅助燃烧合成技术,在5CrNiMo钢表面制备低孔隙率Ti-Al涂层,分析了涂层组织、物相组成、显微硬度及抗铝液腐蚀性能。结果表明,Ti-Al涂层主要物相为Ti;Al、TiAl、TiAl;以及残留的Ti,未发现残留的Al及TiAl;。Ti-Al涂层形成受固-液反应机制控制,涂层组织遵循“球核环状”模型,压坯固有孔隙、间隙中气体及Al粉熔化后留下的位置在热爆反应过程中膨胀为该Ti-Al涂层的成孔机制。涂层平均硬度HV;为377.18,并且在涂层-基体界面处硬度波动最大。Ti-Al涂层在铝合金熔体中的腐蚀机制由液-固界面生成化合物及液态金属扩散进涂层联合控制,而非涂层溶解机制。Ti-Al coating with low porosity was prepared on the surface of 5 CrNiMo steel by using high-frequency induction-assisted combustion synthesis method.Its microstructure,phase composition,microhardness and corrosion resistance to molten aluminum alloy were analyzed.The results show that the as-prepared Ti-Al coating is mainly composed of Ti;Al,TiAl,TiAl;and residual Ti,and no residual Al and TiAl;are detected.The formation of Ti-Al coating is controlled by the solid-liquid reaction mechanism,and the coating structure follows the“spherical core ring”model.The inherent pores of compact,the gas in the gap and the expansion of position left by melting of aluminum powders during the thermal explosion reaction can be regarded as the pore-forming mechanism for the as-prepared Ti-Al coating.The average microhardness HV;of the coating is 377.18,and the greatest fluctuation of coating microhardness is located at the coating-substrate interface.The corrosion mechanism of the Ti-Al coating in molten aluminum alloy is controlled by the combination of compounds formed at the liquid-solid interface and diffusion of liquid metal into coating,rather than coating dissolution.

关 键 词：Ti-Al金属间化合物 Ti-Al涂层 高频感应辅助燃烧合成 显微硬度 物相组成 成孔机制 铝合金熔体腐蚀 

分 类 号：TG702[金属学及工艺—刀具与模具]