(1. 湖南大学 材料科学与工程学院，长沙 410082；
2. 湘潭大学 低维材料及其应用教育部重点实验室，湘潭 411105)
摘 要: 采用溶胶−凝胶法在金刚石表面涂覆TiO2薄膜。利用扫描电镜、能谱以及红外光谱等手段对涂膜后金刚石磨料表面形貌、结构和成键情况进行分析，研究在不同进刀量时TiO2薄膜对金刚石磨削性能的影响。结果表明：磨料表面的TiO2薄膜可以保护金刚石磨料在烧结过程中不受结合剂中碱金属氧化物的侵蚀，提高结合剂对金刚石的润湿性；在进刀量为5 μm/s时，与未涂膜金刚石砂轮相比，涂膜金刚石砂轮对硬质合金(WC，6%(质量分数)Co)的磨耗比提高121%。
关键字: TiO2薄膜；金刚石；陶瓷结合剂；溶胶−凝胶法；磨削性能
（1. College of Materials Science and Technology, Hunan University, Changsha 410082, China;
2. The Key Laboratory of Low Dimensional Materials and Application Technology, Ministry of Education,
Xiangtan University, Xiangtan 411105, China）
Abstract:TiO2 films were prepared on the surface of diamond through sol-gel method. The surface morphologies, structures and chemical bond of TiO2 film/C were studied through SEM, EDS and FTIR. The effect of TiO2 film on the diamond wear performance under different cut depths was discussed. The results show that the compact TiO2 film coated on the diamond surface by sol-gel method can protect the diamond from reacting with the metal oxides in matrix and increase the bonding strength between the matrix and diamond. When the depth of cut is 5 μm/s and work piece is carbide (WC, 6%-Co), the grinding ratio of the vitrified bonded wheel prepared by Ti-film-coated diamond is increased by 121% when compared with the wheel prepared by general diamond.
Key words: TiO2 film; diamond; vitrified bond; sol-gel method; wear performance
