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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%。
The surface of diamond abrasive was coated with TiO2 / Al2O3 film by sol - gel method. The surface topography, structure, anti-oxidation properties of diamond after coating were characterized by means of environmental scanning electron microscopy, energy dispersive spectrometer, Fourier transform infrared spectroscopy, X-ray diffraction, TG-DTA and diamond compressive strength testing And compressive strength were analyzed. At the same time, the influence of TiO2 / Al2O3 film on the grinding performance of ceramic bond diamond grinding wheel was studied. The results show that the anti-oxidation temperature of the coated diamond is 175 ℃ and the compressive strength is increased by 26.4% compared with the uncoated diamond. The TiO2 / Al2O3 film improves the wettability of the ceramic melt under high temperature and the uncoated diamond The surface hardness of the coated diamond wheel increased by 8.7% compared with that of the ceramic bonded wheel, and the abrasion ratio of the cemented carbide (YG8) increased by 66.1%.