TC4钛合金表面氧化锆催渗渗硼工艺的优化  

Optimization of Zirconium Oxide Infiltration Process on Surface of TC4 Titanium Alloy

作　　者：何星华[1] 戈晓岚[1] 许晓静[1] 刘云辉[1] 陶俊[1] 宋振华[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《中国表面工程》2013年第6期52-56,共5页China Surface Engineering

基　　金：江苏大学优秀学术青年骨干培养对象基金(1211110001);扬州市"八大产业"科技攻关与成果转化项目(YZ2011039)

摘　　要：以渗层厚度和表面硬度为评定依据,采用正交试验对TC4钛合金表面氧化锆催渗渗硼工艺进行了优化,其中渗硼温度影响最大,其次为渗硼时间和ZrO2含量,B4C含量影响最小,最优工艺为:渗硼温度1 050℃,渗硼时间25h,渗硼剂配比(质量分数):B4C 20%,ZrO24%,SiC 76%。利用X射线衍射仪和光学显微镜对渗层的物相组成和厚度进行分析,结果表明:渗层表面主要由TiB2、TiB、TiB12、TiC、TiN组成,渗层厚度为46.67μm。与基础渗硼剂所得渗层相比,渗硼层厚度、渗层硬度、界面结合力和耐磨性都有所提高。Zirconium oxide infiltration process on surface of TC4 titanium alloy was optimized by orthogona[ experiments,which was based on the thickness and hardness of boronizing layer. It is concluded that boronizing temperature has the most important effect , the next are boronizing time and content of ZrO2, and the last is the content of B4C. The optimum process is as follows： boronizing temperature is 1 050 ℃, boronizing time is 25 h, and the mass fraction of B4C, ZrO2 , SiC is 20%, 4% and 76%, respectively. The phase composition and thickness of the boronizing layer were analyzed by X-ray diffraction （XRD） and optical microscope. The result shows that the boronizing layer is mainly composed of TiB2 , TiB, TiB^2 , TiC, TiN and the thickness of the bo- ronizing layer is 46.67 μm. Compared with the basic formula, thickness, hardness, interface bonding force and ab- rasive resistance of titanium alloy surface is obviously improved.

关 键 词：TC4钛合金 固体渗硼 正交试验 氧化锆 催渗工艺 

分 类 号：TG174.445[金属学及工艺—金属表面处理] TG156.87[金属学及工艺—金属学]