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采用离子束增强沉积方法,在p型(100)单晶硅衬底上,通过不同能量的氙离子辅助轰击,以不同的沉积速率制备了Ti-B超硬薄膜。X射线衍射分析结果表明,Ti-B薄膜呈TiBx多晶结构,其晶化程度随蒸发速率的不同而变化,而其缺位值x随氙离子轰击能量的不同而变化。超显微硬度的测试结果表明,氙离子束能量为60keV,沉积速率为0.6nm/s时,可以获得性能最佳的Ti-B超硬薄膜,其本征硬度在测试负荷为5mN时达28.6GPa,超过了TiB体材料的硬度水平,是衬底硅片的3.2倍。利用SEM观察了Ti-B薄膜的横断面,并讨论了工艺参数对Ti-B超硬薄膜韧性的影响。
Ti-B superhard films were prepared on p-type (100) monocrystalline silicon substrates by xenon ion bombardment with different energies at different deposition rates by ion beam enhanced deposition. The results of X-ray diffraction analysis show that Ti-B thin films have TiBx polycrystalline structure, and the degree of crystallization changes with the evaporation rate, while the vacancy value x changes with the xenon ion bombardment energy. The test results of the ultra-microhardness show that the Ti-B superhard film with the best performance can be obtained when the xenon beam energy is 60keV and the deposition rate is 0.6nm / s. The intrinsic hardness of the Ti-B ultrahard film reaches 5mN 28.6GPa, exceeding the hardness of the TiB material, which is 3.2 times that of the substrate silicon. The cross section of Ti-B film was observed by SEM, and the influence of process parameters on the toughness of Ti-B superhard film was discussed.