Preparation and properties of diamond abrasive coated with titania/alumina film

Abstract

A titania/alumina (TiO2/Al2O3) film was coated on the surface of diamond abrasive by a sol-gel method. The surface morphology, structure, oxidation resistance properties and compressive strength of the film coated diamond were analyzed by environmental scanning electron microscope, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray diffractometer, thermogravimetry-differential scanning calorimetry and single particle compressive strength test. The grinding performance of a vitrified-bond grinding wheel prepared by the TiO2/Al2O3 film coated diamond was investigated. The results show that compared to the uncoated diamond, the oxidation resistance temperature of the film coated diamond is increased by 175 °C, and the compressive strength is increased by 26.4%. It was also found that the TiO2/Al2O3 film could give a wettability between diamond and vitrified-bond matrix at high temperatures. Compared to the uncoated diamond, the hardness of the vitrified-bond grinding wheel prepared by the TiO2/Al2O3 film coated diamond was increased by 8.7% and the grinding ratio to carbide alloy (YG8) was increased by 66.1%.