热等静压成形Ti6Al4V制件的石墨控形精度与Ni耐磨涂层性能的研究  

Study on Graphite as Material of Control-shaped Core Accuracy and Tribological Behavior of Ni Layer in Ti6Al4V Alloy Powder Fabricated by Hot Isostatic Pressing

作　　者：蔡超[1] 薛鹏举[1] 吴言[1] 史玉升[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《电加工与模具》2016年第4期49-52,61,共5页Electromachining & Mould

摘　　要：热等静压粉末近净成形技术在航空航天发动机关键零部件制造上有其独特的优势,但采用传统不锈钢或碳钢为控形型芯材料时,往往会造成制件内部变形大、控形不精准,且此类零部件成形后还需后续的表面处理,大大增加了该零部件的加工生产周期。基于此,提出了一种热等静压成形复杂结构同时完成功能层在线制备的成形方法。该方法选用石墨为控形型芯材料,热等静压前在石墨表面沉积一层耐磨涂层,使热等静压过程中预涂层原位扩散到正在成形的制件表面,实现复杂结构与功能涂层一体化成形。以Ni作为预涂层材料、Ti6Al4V为粉末成形材料,研究了石墨的控形效果及致密体成形后表面Ni涂层的耐磨性能,验证了该方法的可行性。Hot isostatic pressing （HIP） technology has unique advantages on the fabrication of the key part in aerospace engine. However,serious deformation would be formed in the internal parts during HIP process, when steel or carbon steel is as the material of the control-core. Those components need subsequently machining to improve the surface quality before application. Therefore,a new method that complex-shaped components with high surface quality and a Ni coating was in-situ manufactured during HIP was proposed in this study. In the present work,a nickel coating was attempted to be in-suit fabricated on the Ti6Al4V parts. And a graphite core was used for controlling the HIPped Ti6Al4V parts.

关 键 词：热等静压 航空航天 TI6AL4V 耐磨涂层 

分 类 号：TG669[金属学及工艺—金属切削加工及机床]