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为改善钛合金室温和高温摩擦学性能,分别采用锆-氮离子共渗(Zr+N)与离子渗锆后渗氮(Zr/N)两种工艺在TC4钛合金表面制备锆-氮改性层。利用球盘磨损试验机对比研究了两种Zr-N改性层在室温和600℃高温环境下的摩擦学性能。结果表明,两种工艺制备的Zr-N改性层均由ZrN相组成,Zr/N改性层还包含少量TiN相和较厚的Zr-Ti固溶体,两种等离子表面合金化层均使钛合金表面硬度显著提高。Zr/N改性层比Zr+N离子共渗层表面硬度更高,渗层更深,表面承载能力更强。室温和600℃高温下,Zr/N改性层磨损率比TC4钛合金基材分别降低43倍和21倍;Zr+N共渗改性层磨损率比TC4钛合金基材分别降低24倍和5倍。
In order to improve the tribological properties of titanium alloy at room temperature and high temperature, zirconium - nitrogen ion osmosis (Zr + N) and nitriding (Zr / N) Floor. The tribological properties of two kinds of Zr-N modified layers were investigated at room temperature and high temperature of 600 ℃ by ball-plate wear tester. The results show that both Zr-N modified layers prepared by the two processes are composed of ZrN phase, the Zr / N modified layer also contains a small amount of TiN phase and thicker Zr-Ti solid solution. Both plasma surface alloying layers make titanium Alloy surface hardness increased significantly. The surface hardness of Zr / N modified layer is higher than that of Zr + N ion-permeable layer, the diffusion layer is deeper and the surface carrying capacity is stronger. At room temperature and 600 ℃, the wear rate of Zr / N modified layer is 43 times and 21 times less than that of TC4 titanium alloy respectively. The wear rate of Zr + N co-modified modified layer is 24 times lower than that of TC4 titanium alloy respectively 5 times.