TC4钛合金表面激光原位反应制备TiN涂层及性能研究  

In-Situ Synthesized TiN Coating by Laser Nitriding on TC4 Titanium Alloy Surface

作　　者：刘熊 邱长军[1] 刘豪 胡良斌[1] 陈勇[1] LIU Xiong;QIU Changjun;LIU Hao;HU Liangbin;CHEN Yong(School of Mechanical Engineering,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学机械工程学院,衡阳421001

出　　处：《航空制造技术》2018年第23期52-58,共7页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51474130);国家科技重大专项子课题项目(2015ZX06004001-002);湖南省重点学科建设项目(湘教发[2011]76);湖南省高校重点实验室基金项目(湘教发[2014]85);南华大学研究生科学基金项目(2018KYY063)

摘　　要：利用激光原位反应技术在TC4钛合金表面制备了无裂纹、组织均匀致密的TiN涂层,并分析了激光氮化层的显微组织、成分和物相,测试了涂层横截面显微硬度、涂层耐磨性能及抗SiO_2颗粒高速冲蚀的能力。结果表明:在适当的激光参数下制备的氮化钛涂层与TC4基体之间呈现良好的冶金结合,其界面结合强度为240～270MPa;涂层主要为硬质TiN相,涂层硬度高达1550HV_(0.1),约为基材的4.5倍;涂层磨损失重量是TC4钛合金的14.7%;在60o冲蚀角度下,基材的冲蚀质量损失为涂层的2倍。TiN coatings with no crack and uniform compact structure were fabricated on the TC4 titanium alloy by laser micro-fusion in-situ synthesized technology.The micro-structure,chemical composition and phase of the coating were analyzed,in addition,the micro hardness of the coating,bond strength between coating and titanium alloy matrix,and the wear resistance of coating were tested.The resistance of erosion of SiO2 particles with high-speed was also tested.It was found that the bonding strength of TiN coating and TC4 titanium alloy was 240–270MPa due to good metallurgical combination between them.The micro hardness of the coatings was found to reach 1550HV0.1,around 4.5 times of the matrix which is ascribed to the formation of TiN with high hardness.Moreover,the loss weight of coating wear was 14.7% of TC4 titanium alloy and the mass loss of the substrate was twice that of the coating at an erosion angle of 60°.

关 键 词：TC4钛合金 激光微熔 原位反应 TIN涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]