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为解决传统电镀工艺在进行金刚石磨料表面改性时所产生的能耗及环境污染问题,采用溶胶-凝胶工艺在金刚石表面涂覆了一层致密的TiO2薄膜。通过扫描电镜、能谱、红外光谱、Raman光谱和综合热分析等手段对涂膜后的金刚石磨料表面形貌、结构和性能进行表征。结果显示:表面涂覆TiO2薄膜的金刚石磨料在空气中开始氧化并发生质量损失的温度为700℃,较未涂膜的金刚石磨料的起始氧化温度提高150℃。用涂TiO2膜金刚石磨料制备的陶瓷结合剂金刚石砂轮,其硬度较未涂膜磨料制备的砂轮提高13%,对硬质合金的摩耗比提高2.2倍。
In order to solve the energy consumption and environmental pollution caused by the traditional electroplating process, the diamond surface is coated with a dense TiO2 thin film by sol-gel process. The surface morphology, structure and properties of the diamond-coated diamond abrasive were characterized by scanning electron microscopy, energy dispersive spectroscopy, infrared spectroscopy, Raman spectroscopy and comprehensive thermal analysis. The results show that the initial oxidation temperature of diamond abrasive coated with TiO2 thin film on air is about 700 ℃, which is higher than that of the uncoated diamond abrasive at 150 ℃. The ceramic bonded diamond grinding wheel with TiO2 film coated diamond abrasive has a hardness of 13% higher than that of the uncoated abrasive and 2.2 times higher than that of cemented carbide.