喷砂、喷丸前处理对TC21钛合金超音速火焰喷涂WC-17Co涂层的影响  

Effect of Grit Blasting and Shot Peening Pretreatment on WC-17CO Coating of TC21 Titanium Alloy by Supersonic Flame Spraying

作　　者：王浩军 胡生双 孟保利 张兵宪 赵虎 舒文芳 张颖云 WANG Haojun;HU Shengshuang;MENG Baoli;ZHANG Bingxian;ZHAO Hu;SHU Wenfang;ZHANG Yingyun(Avic Xi'an Aircraft Industry Group Company Ltd.,Xi'an 710089,China)

机构地区：[1]中航西安飞机工业集团股份有限公司,陕西西安710089

出　　处：《热加工工艺》2025年第4期38-41,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51761029,51864035)。

摘　　要：对TC21钛合金表面进行了喷砂、喷丸前处理及超音速火焰WC-17Co喷涂,研究了喷砂、喷丸前处理对TC21钛合金超音速火焰喷涂WC-17Co涂层的影响。结果表明,喷砂和喷丸前处理WC-17Co涂层均呈现组织均匀,与基材良好结合的形貌特征。喷砂前处理后涂层与基材结合面突起或凹陷较为尖锐,且还会存在外来氧化铝砂粒的嵌入,而喷丸前处理后结合面凸凹圆润,不引入外来杂质。喷砂对TC21钛合金表面粗糙度的影响比喷丸更加显著,但喷砂和喷丸前处理后WC-17Co涂层表面粗糙度差别不明显,WC-17Co涂层表面粗糙度可达4.602μm;喷砂和喷丸前处理WC-17Co涂层硬度变化规律相似,硬度达1600~1800 HK0.98,高于基体硬度4倍以上;喷砂与喷丸前处理的WC-17Co涂层孔隙率相差不大,但涂层与基体界面附近,喷砂前处理后WC-17Co涂层孔隙率高于喷丸前处理的。The surface of TC21 titanium alloy was treated by pretreatment of grit blasting and shot peening and high velocity oxy-fuel spraying WC-17Co.The effects of grit blasting and shot peening pretreatment on TC21 titanium alloy by supersonic flame spraying WC-17Co coating were studied.The results show that the microstructure of WC-17Co coating with grit blasting and shot peening pretreatment is uniform and well combined with the substrate.The protrusion or sag of the bonding surface between the coating and the substrate is sharper after grit blasting,and there is the embedding of foreign alumina sand particles,while the bonding surface after shot peening pretreatment is convex and concave,without introducing foreign impurities.The effect of grit blasting on the surface roughness of TC21 titanium alloy is more significant than that of shot peening pretreatment,but the surface roughness of WC-17Co coating is not significantly different with grit blasting and shot peening pretreatment,and the surface roughness of WC-17Co coating can reach 4.602μm.The hardness of WC-17Co coating with grit blasting and shot peening pretreatment is similar,and the hardness is 1600-1800 HK0.98,which is more than 4 times higher than the hardness of matrix.The porosity of the coating with grit blasting and shot peening pretreatment is not different,but near the interface between coating and substrate,the porosity of WC-17Co coating with grit blasting pretreatment is higher than that with shot peening pretreatment.

关 键 词：喷砂、喷丸前处理 超音速火焰喷涂 WC-17Co涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]