钛及钛合金因与生物肌体组织相容性好，在组织体液中耐蚀性优异，密度比铁和钴基合金小得多，因而越来越广泛地用作植入件、外科手术器械等．但钛不耐磨，而传统的表面改性方法虽可使其耐磨性增大，却使疲劳抗力降低．室温下钛表面离于注入Ｎ和Ｃ可使其耐磨性和疲劳抗力同时提 Titanium and titanium alloys are more and more widely used as implants, surgical instruments and the like because of their good compatibility with biological tissues, their excellent corrosion resistance in body fluids and their much lower density than iron and cobalt-based alloys . However, titanium is not wear-resistant, while the traditional method of surface modification may increase its wear resistance, fatigue resistance decreased. Ti surface at room temperature from the injection of N and C can make its wear resistance and fatigue resistance simultaneously