液相渗硅法和原位反应法制备硅化石墨及性能研究

Preparation of siliconized graphite by liquid silicon infiltration and in-situ reaction method

摘要:

分别采用液相渗硅法和原位反应法制备了硅化石墨,讨论了石墨基体密度和渗硅方法对硅化石墨力学性能和摩擦性能的影响。结果表明：两种方法都能明显提升石墨的抗弯强度,液相渗硅法制得的硅化石墨表面有一层浓度梯度分布的SiC层,石墨基体的耐磨性能得到明显改善。综合力学性能和摩擦性能考虑,选择低密度的石墨通过石墨化处理并采用液相渗硅法可以制备得到性能更优的硅化石墨。

Abstract:

Silicified graphite was prepared by liquid-phase siliconizing method and in-situ reaction method. The influence of graphite matrix density and siliconizing method on the mechanical properties and friction properties of siliconized graphite was discussed. The results show that the two methods can significantly improve the flexural strength of graphite. The surface of the siliconized graphite prepared by the liquid-phase siliconizing method has a SiC layer with a concentration gradient, which can significantly improve the wear resistance of the matrix. Considering the comprehensive mechanical properties and friction properties, choosing low-density graphite through graphitization treatment and adopting the liquid phase siliconizing method can prepare silicified graphite with better performance.