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利用溶胶-凝胶法在金刚石表面涂覆一层Ti O_2薄膜,通过扫描电镜、红外光谱、拉曼光谱、X射线衍射、光电子能谱、综合热分析、破裂强度试验等测试方法,表征了热处理温度对金刚石表面Ti O_2薄膜的形貌、相组成、相变、与基体金刚石的成键和涂膜后金刚石抗氧化性能的影响。结果表明:热处理温度上升到600℃时,金刚石表面的Ti O_2薄膜会由无定型态转变为致密的锐钛矿相薄膜,Ti O_2与金刚石基体形成Ti-O-C化学键合;热处理温度为800℃时,Ti O_2薄膜依然为锐钛矿相,金刚石基体产生石墨化,石墨C也能与Ti O_2薄膜形成Ti-O-C化学键合,但薄膜开始出现裂纹。同时,Ti O_2薄膜的热处理温度对金刚石在空气中的抗氧化性能有较大影响,当热处理温度在600℃时,金刚石的起始氧化温度达到最大值754℃,在空气中800℃氧化0.5 h金刚石的氧化失重率达到最小值6.7%,抗压强度达到最大值15.7 N。
The surface of diamond was coated with a thin layer of Ti O_2 by sol-gel method. The properties of the films were characterized by scanning electron microscopy, infrared spectroscopy, Raman spectroscopy, X-ray diffraction, photoelectron spectroscopy, thermal analysis and rupture strength test. Effect of Temperature on the Morphology, Phase Composition and Transformation of Ti O_2 Films on Diamond Surface, and the Bonds with Matrix Diamonds and the Antioxidation Performance of Diamond Films after Drilling. The results show that the Ti O 2 film on the diamond surface changes from an amorphous state to a dense anatase phase film when the heat treatment temperature is raised to 600 ℃, and Ti O 2 is chemically bonded to the diamond matrix. The heat treatment temperature is 800 ℃ , The Ti O_2 film remains anatase, the diamond matrix is graphitized, and the graphite C also forms Ti-OC bond with the Ti O_2 film, but the film begins to crack. At the same time, the heat treatment temperature of Ti O 2 film has a significant effect on the oxidation resistance of diamond in air. When the heat treatment temperature is 600 ℃, the initial oxidation temperature of diamond reaches 754 ℃, and the oxidation temperature of the diamond in air at 800 ℃ for 0.5 h Diamond oxide weight loss rate of 6.7% minimum, compressive strength reached a maximum of 15.7 N.