液相渗硅法和原位反应法制备硅化石墨及性能研究  

Preparation and Properties of Siliconized Graphite by Liquid Silicon Infiltration and In-Situ Reaction Method

作　　者：孙国栋[1] 吕文炯 解静 李辉[1] 罗伟华[1] 贾研 Sun Guodong;Lv Wenjiong;Xie Jing;Li Hui;Luo Weihua;Jia Yan(School of Materials Science and Engineering,Chang’an University,Xi’an 710064,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《稀有金属材料与工程》2021年第12期4509-4515,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51902028);中央高校基本科研业务费专项基金(300102310102,300102310105,300102319302);陕西省自然科学基金重点项目(2020JQ-372,2021JM-172);陕西省重点研发计划(2021GY-252)。

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:2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。Silicified graphite was prepared by liquid-phase siliconizing method and in-situ reaction method.The influences of graphite matrix density and siliconizing method on the mechanical properties and friction properties of siliconized graphite were 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,silicified graphite with better performance can be prepared by choosing low-density graphite through graphitization treatment and adopting the liquid phase siliconizing method.

关 键 词：硅化石墨 液相渗硅法 原位反应法 SiC层 

分 类 号：TB332[一般工业技术—材料科学与工程]