等离子束表面冶金(Cr,Fe)_7C_3/γ-Fe金属陶瓷复合涂层工艺  

Process of(Cr,Fe)_7C_3/γ-Fe ceramal composite coating formed by plasma surface metallurgy

作　　者：刘均波[1] 

机构地区：[1]潍坊学院机电系,山东潍坊261061

出　　处：《焊接学报》2007年第4期17-20,共4页Transactions of The China Welding Institution

基　　金：山东省自然科学基金资助项目(Y2002F12)

摘　　要：研究了工艺参数对等离子束表面冶金涂层的影响。当工作电流降低或扫描速度增加时,冶金层组织趋于细化。由此确定最佳工作电流值为300 A,扫描速度为500mm/min。采用优化的工艺参数,以Fe-Cr-C-Nb-Al粉末为原料,在Q 235钢表面制得以原位生成(Cr,Fe)7C3为增强相,以γ-Fe固溶体与少量(Cr,Fe)7C3构成的共晶为基体的复合涂层。涂层组织致密,与基材完全冶金结合。The effect of process parameters on the(Cr,Fe)7C3/γ-Fe ceramal composite coating formed by plasma surface metallurgy on Q235 steel substrate was researched.With the increase of scanning speed or decrease of working current,microstructure of coating was refined.Therefore,it can be ascertained that the optimum working current is 300 A and the optimum scanning speed is 500 mm/min.A in situ reinforcing phase(Cr,Fe)7C3 ceramal composite coating was fabricated on substrate of Q235 steel by plasma surface metallurgy with the Fe-Cr-C-NbAl alloy powders.The ceramal composite coating has a rapidly solidified microstructure consisted of primary(Cr,Fe)7C3 and the(Cr,Fe)7C3/γ-Fe eutectics,and is metallurgically bonded to Q235 steel substrate.

关 键 词：等离子束表面倚金 工艺参数 显微组织 屁微硬度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]