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金刚石表面涂覆TiO2/Al2O3薄膜及性能

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Abstract:

采用溶胶-凝胶法在金刚石磨料表面涂覆TiO2/Al2O3薄膜。通过环境扫描电子显微镜、能谱仪、Fourier变换红外光谱仪、X射线衍射、热重-差示扫描量热、金刚石抗压强度检测等方法,对涂膜后金刚石表面形貌、结构、抗氧化性能和抗压强度进行分析,同时研究了TiO2/Al2O3薄膜对陶瓷结合剂金刚石砂轮磨削性能的影响。结果表明涂膜金刚石较未涂膜金刚石抗氧化温度提高了175℃,抗压强度提高26.4%;TiO2/Al2O3薄膜改善了高温状态下陶瓷熔料对金刚石的润湿性;与未涂膜金刚石陶瓷结合剂砂轮相比,涂膜金刚石砂轮表面硬度提高8.7%,对硬质合金(YG8)的磨耗比提高66.1%。

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