TC4钛合金表面激光合金化制备Ti-Si涂层  

Ti-Si Coating by Laser Alloying on TC4 Titanium Alloy

作　　者：吴桂兰[1] 许晓静[1] 戈晓岚[1] 陶俊[1] 刘庆辉[1] 仲奕颖 何星华[1] 

机构地区：[1]江苏大学,江苏镇江212013

出　　处：《稀有金属材料与工程》2017年第7期1949-1953,共5页Rare Metal Materials and Engineering

基　　金：江苏大学拔尖人才基金(1211110001);江苏省优势学科资助基金

摘　　要：以Ti、Si单质元素混合粉末为原料,采用激光合金化技术在钛合金表面成功制备出了Ti-Si合金涂层。分析了涂层的组织形貌、成分和物相组成,测试了涂层的显微硬度及与YG6在干摩擦磨损条件下的摩擦磨损性能。结果表明:在合适的激光合金化参数下制备的Ti-Si涂层整体均匀致密,无裂纹且与TC4基体呈良好的冶金结合;涂层组织主要由针状的α-Ti基体和网状分布的Ti_5Si_3/β-Ti共晶体(室温下为Ti_5Si_3/α-Ti)组成;自下而上涂层组织细化,硬度HV在6600~7300 MPa之间,与TC4钛合金相比,平均摩擦系数降低(0.39 vs 0.45),耐磨性提高2.4倍。Ti-Si alloy coating was fabricated on the surface of titanium alloy by laser alloying using Ti and Si elemental elements mixed powder as staring material. Morphology, composition and phase of the coating were investigated. Microhardness and tribological properties under dry friction and wear conditions were tested. The results show that the Ti-Si coating prepared under appropriate parameters of laser alloying is uniform and dense, crack-free, and exhibits good metallurgical bonding with TC4 base; the microstructure of the coating consists of needle-like α-Ti matrix and Ti_5Si_3/β-Ti eutectic（Ti_5Si_3/α-Ti at room temperature） of network distribution; the hardness HV of the coating is between 6600~7300 MPa; compared with that of TC4 titanium alloy, the average friction coefficient of the coating decreases（0.39 vs 0.45） and its wear resistance increases by 2.4 times.

关 键 词：TC4钛合金 激光合金化 Ti-Si合金 组织 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]