金刚石表面涂覆TiO_2/Al_2O_3薄膜及性能  

Preparation and Properties of Diamond Abrasive Coated with Titania/Alumina Film

作　　者：胡伟达[1] 万隆[1] 刘小磐[1] 陈茂开[1] 万众[2] 钱琦[2] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]吉林大学物理学院,长春130021

出　　处：《硅酸盐学报》2011年第5期829-835,共7页Journal of The Chinese Ceramic Society

基　　金：湖南省科技计划项目(2009GK3140);长沙市科技计划项目(K09050121-11)资助

摘　　要：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%。A titania/alumina（TiO2/Al2O3） film was coated on the surface of diamond abrasive by a sol–gel method.The surface mor-phology,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,thermogra-vimetry–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 dia-mond,the oxidation resistance temperature of the film coated diamond is increased by 175 ℃,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 tem-peratures.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%.

关 键 词：金刚石 溶胶–凝胶法 薄膜 氧化钛 氧化铝 

分 类 号：TG146.4[一般工业技术—材料科学与工程]