钛合金的高温固态渗氧-扩散固溶复合处理

Solid Oxygen-Permeation & Diffusion-Solution Treatment of Titanium Alloy at High Temperature

摘要:

为了提高钛合金的表面耐磨性能，发展了一种表面无氧化膜的高温固态渗氧．扩散固溶复合处理方法（OP-DS）。利用TGA，SEM，XRD，XPS及显微硬度计对OP-DS处理后的钛合金进行了研究。结果表明：OP-DS方法能显著提高合金表面层的硬度，硬化层深度随预渗氧时间的延长而增加；预渗氧处理时间对扩散固溶效果有很大的影响，适当的预渗氧时间可在表面形成无膜强化固溶层。从热力学及动力学角度对渗氧．扩散固溶机理进行了探讨。

Abstract:

In order to improve the wear resistance of titanium alloys, a process of oxygen-permeation & diffusion-solution (OP-DS) was developed, by which no oxide film was formed on the surface. The titanium alloy of TC11 was studied by TGA, SEM, XRD, XPS and micro-hardness tester at high temperature. The results indicate that the hardening depth and the hardness of surface layer can be remarkably enhanced, and the surface oxide film is decreased by the OP-DS process. The pre-OP treating time exhibited significant effect on the following DS treatment, even a hardened layer without oxide scale could be produced by proper combination of OP and DS. The OP-DS process was also discussed in terms of thermal diffusion mechanism.