(1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082；
2. 湘潭大學(xué) 低維材料及其應(yīng)用教育部重點(diǎn)實(shí)驗(yàn)室，湘潭 411105)
摘 要: 采用溶膠−凝膠法在金剛石表面涂覆TiO2薄膜。利用掃描電鏡、能譜以及紅外光譜等手段對涂膜后金剛石磨料表面形貌、結(jié)構(gòu)和成鍵情況進(jìn)行分析，研究在不同進(jìn)刀量時TiO2薄膜對金剛石磨削性能的影響。結(jié)果表明：磨料表面的TiO2薄膜可以保護(hù)金剛石磨料在燒結(jié)過程中不受結(jié)合劑中堿金屬氧化物的侵蝕，提高結(jié)合劑對金剛石的潤濕性；在進(jìn)刀量為5 μm/s時，與未涂膜金剛石砂輪相比，涂膜金剛石砂輪對硬質(zhì)合金(WC，6%(質(zhì)量分?jǐn)?shù))Co)的磨耗比提高121%。
關(guān)鍵字: TiO2薄膜；金剛石；陶瓷結(jié)合劑；溶膠−凝膠法；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
