(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 湘雅口腔医院，长沙 410078；
3. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 金刚石薄膜可以加强牙科用钛合金(TC4)基台止动螺钉稳定性，延长其使用寿命。通过热丝辅助化学气相沉积(HFCVD)在TC4上沉积微米晶金刚石(MCD)和纳米金刚石(NCD)薄膜，分别采用SEM、AFM和Raman光谱对金刚石薄膜的形貌和质量进行表征，采用划痕实验检测了薄膜的结合强度。结果表明：沉积得到的NCD和MCD薄膜连续致密，表面粗糙度小，结合良好；金刚石薄膜有效地降低了TC4表面的摩擦因数和磨损率，NCD的摩擦因数约为0.09~0.15，MCD的约为0.18~0.22，其中在人工唾液环境下表现出更低的摩擦因数；金刚石薄膜人工唾液环境中能有效地提升材料的耐腐蚀性能，TC4表面沉积所得NCD薄膜的各项性能指标均优于MCD薄膜的。
关键字: 金刚石薄膜；钛合金；结合强度；摩擦学性能；耐腐蚀性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Xiangya Stomatological Hospital, Central South University, Changsha 410078, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The diamond coatings may strengthen the stability of the titanium abutment screw in dentistry for improving its lifespan. The nanocrystalline diamond (NCD) and microcrystalline diamond (MCD) films were deposited on titanium alloy (TC4) by hot-？lament-assisted chemical vapor deposition (HFCVD). The morphology and quality of the diamond films were evaluated by SEM, AFM and Raman spectroscopy, respectively. The adhesive strength between the film and substrate was characterized by scratch test. The results show that as-deposited NCD and MCD films have continuous, dense, small surface roughness and good adhesion. The friction experiments indicate that diamond coating lowers the friction coefficient and friction rate. The friction coefficient of NCD and MCD are about 0.09-0.15 and 0.18-0.22, wherein, the artificial saliva exhibit even lower. MCD coating also promotes the corrosion resistance in artificial saliva. All the results present that TC4 surface deposited with NCD film provides superior performances than MCD film.
Key words: diamond film; titanium alloy; adhesive strength; tribological behavior; corrosion resistance
