TA2熔盐电解法渗硼的研究现状及展望

钛及其合金作为21世纪重要的结构材料,具有抗腐蚀、熔点高、密度小、比强度高、无磁性及生物相容性等优点,但表面硬度低、耐磨性差、摩擦系数大,严重限制了其应用范围.熔盐电解法渗硼作为一种金属表面改性技术,具有成本低廉、效果明显等优点,可有效提高钛及其合金的表面硬度和耐磨性.综述了熔盐电解法渗硼的研究现状,从渗硼的工艺参数、机理、热力学和动力学方面进行了分析.综合双相硼化物(TiB和TiB2)渗层的生长动力学的研究结论,可以看出渗硼问题的核心就是活性B原子在固相的扩散,因此研究近相变温度下B原子的扩散行为对渗硼过程尤为重要.

The Research Status and Prospect of Molten Salt Electrolytic Boriding on Titanium

As an important structural material of the 21st century, titanium has a lot of outstanding characteristics, such as excellent anticorrosion, high melting point,low density,high specific strength,non-magnetism and biocompatibility, etc. Nevertheless,the application of titanium under severe wear and friction conditions was strictly restricted due to their poor tribological properties such as high friction coefficient and low hardness. As an effective method for improving the surface hardness and wear resistance of the titanium metal and its alloys, molten salt electrolytic boriding on titanium surface has the advantages of low cost and effectiveness. The research status of molten salt electrolytic boriding on titanium is reviewed, which includes the process parameters, thermodynamics and kinetics study of the boring mechanism. It is found by summarizing the research results that the key points of the boriding process is the diffusion of boron atom in solid phase, hence it is important to carry out research work on the diffusion behavior of boron atom near the phase transition temperature.