Si_(3)N_(4)对碳/碳复合材料表面SiC涂层耐磨性的影响  

Effect of Si_(3)N_(4) on the Wear Resistance of SiC Coatings on Surface of Carbon/Carbon Composites

作　　者：毛祖莉 杨丽 伍杰 周术 MAO Zu-li;YANG Li;WU Jie;ZHOU Shu(Research Institute of Automotive Parts Technology,Hunan Institute of Technology,Hengyang 421000,China)

机构地区：[1]湖南工学院汽车零部件技术研究院,湖南衡阳421000

出　　处：《材料保护》2022年第3期41-46,共6页Materials Protection

基　　金：2021年度湖南省大学生创新创业项目“以鸡蛋壳为钙源在C/C复合材料表面制备HA涂层”(湘教通[2021]197号);地方高校全国大学生创新创业训练计划(201711528009);衡阳市科学技术发展计划项目(2016KG67)资助。

摘　　要：为了提高碳/碳复合材料表面SiC涂层的耐磨性,采用包埋法和氮化处理制备SiC/Si_(3)N_(4)涂层。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱分析仪(EDS)及摩擦磨损试验,分别评价SiC涂层与SiC/Si_(3)N_(4)涂层的表面形貌、物相组成、磨损形貌及摩擦磨损性能,并研究涂层显微组织结构与磨损机理之间的联系。结果表明:SiC/Si_(3)N_(4)涂层由Si_(3)N_(4)相、SiC相和C相组成,涂层平整且致密;SiC/Si_(3)N_(4)涂层的摩擦系数低于0.05且更稳定;SiC涂层高摩擦系数值的主要磨损机制是黏着磨损和磨料磨损;SiC/Si_(3)N_(4)涂层中形成了一层较薄的润滑膜,并在摩擦磨损的后续阶段降低摩擦系数。Si_(3)N_(4)相的引入可以有效改善SiC涂层的表面结构,使得SiC涂层摩擦系数更小且更稳定,从而提高涂层耐磨性。Aiming at improving the wear resistance of SiC coatings on surface of carbon/carbon composites, SiC/Si_(3)N_(4)coating was synthesized by pack cementation and nitriding treatment. The surface morphology, phase composition, worn surface, and friction and wear properties of SiC coating and SiC/Si_(3)N_(4)coating were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS) and friction and wear test, respectively. Furthermore, the relationship between microstructure of the coating and wear mechanisms was investigated. Results showed that the SiC/Si_(3)N_(4)coating consisited of the Si_(3)N_(4)phase, SiC phase and C phases. The SiC/Si_(3)N_(4)coating surface was flat and dense. Additionally, SiC/Si_(3)N_(4)coating had lower frictional coefficient(<0.05) and exhibited more stable property. The main wear mechanisms of the high friction coefficient value of SiC coating were adhesive wear and abrasive wear. A thinner lubricating film was formed in the SiC/Si_(3)N_(4)coating and reduced the friction coefficient in the subsequent friction and wear stages. Moreover, the addition of the Si_(3)N_(4)phase could effectively improve the surface structure of the SiC coating, making the friction coefficient of the SiC coating smaller and more stable, thereby improving the wear resistance of the coating.

关 键 词：碳/碳复合材料 SiC/Si_(3)N_(4)涂层 微观结构 磨损机制 

分 类 号：TG335.86[金属学及工艺—金属压力加工]