为了提高TC4钛合金的表面硬度及耐磨性,对其进行了820℃×10 h 的低压渗氮处理；通过X射线衍射仪、光学显微镜、扫描电子显微镜、显微硬度计及磨损试验机研究了表面渗氮层的显微组织与耐磨性能。结果表明：渗氮处理后,该钛合金表面形成了由表面氮化物层和次表面氮扩散层组成的渗氮层,其物相组成为TiN、Ti2 AlN和Ti3 Al；渗氮层的表面硬度为800~900 HV,比基体的提高了近3倍,截面硬度随着深度的增加而下降；在相同条件下,渗氮后试样的磨损质量损失比未经渗氮处理的小,且随载荷的增加磨损质量损失增加更缓慢,耐磨性得到了极大的改善。
The low pressure nitriding treatment at 820 ℃ for 10 h was conducted on the surface of TC4 titanium alloy to improve its surface hardness and wear resistance,and then the microstructure and wear resistance of the surface nitrided layer were studied by X-ray diffraction,optical microscope,scanning electron microscope, microhardness tester and wear testing machine.The results show that after nitriding treatment,the nitrided layer consisted of surface nitride layer and subsurface nitrogen diffusion layer was formed on the surface of TC4 titanium alloy.The nitrided layer was mainly composed of TiN,Ti2 AlN and Ti3 Al.The surface hardness of the layer was 800-900 HV,which was 3 times as much as that of the substrate,and the sectional hardness decreased with the increase of depth.Under the same condition,the wear mass loss of the nitrided sample was lower than that before nitriding treatment and increased more slowly with the increase of load,showing the great improvement of wear resistance.
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