不同载荷下碳化钽/灰铸铁表面复合材料的摩擦磨损行为及机理  

Friction and Wear Behavior and Mechanism of Tantalum Carbide/Iron Surface Composites under Different Load

作　　者：薛培婧[1] 钟黎声[1] 赵娜娜[2] 王亮亮[1] 

机构地区：[1]西安建筑科技大学材料与矿资学院,陕西西安710055 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《材料保护》2013年第3期11-14,3+2,共4页Materials Protection

基　　金：国家自然科学基金面上项目(50974101);国家863高科技研究发展计划项目(2013AA031803)资助

摘　　要：为了节省资源,降低成本并制备具有优异摩擦磨损性能的碳化物表面复合材料,采用原位反应方法制备了碳化钽/灰口铁(TaC/Fe)表面复合材料。通过扫描电镜(SEM)和磨损试验分析了其组织结构,重点研究了增强相颗粒TaC的形貌特征与分布特点,同时研究了该复合材料与45钢配副时的摩擦磨损特性,并分析了载荷对摩擦系数和磨损量的影响,分析了其摩擦磨损机理。结果表明:TaC/Fe复合材料增强层分为2层,组织结构均匀,表现出较典型的梯度复合特点;复合材料摩擦系数随载荷的增加逐渐降低,下降趋势逐渐变缓;复合材料磨损量随载荷的增加而下降,总体磨损量较小;复合材料的磨损机制主要包括黏着磨损、磨粒磨损、疲劳磨损、硬质颗粒的脆性断裂和剥落。Tantalum carbide-iron (denoted as TaC/Fe) surface composites were prepared by insitu reaction. The morphology and distribution of TaC reinforcing particulates in as-prepared TaC/Fe surface composites were analyzed with a scanning electron microscope. In the meantime, the friction and wear behavior of as-prepared TaC/Fe composites coupled with 45 steel was evaluated. The effect of load on the friction coefficient and wear mass loss of the composites was investigated, and the friction and wear mechanisms were discussed. It was found that as-prepared TaC/Fe surface composites contained evenly distributed reinforcing layer and possessed typical gradient structure and composition. At the same time, the friction coefficient and wear mass loss of as-prepared composites declined with increasing load, and the total wear mass loss of the composites was relatively small. Besides, the main wear mechanisms of as-prepared composites included adhesion wear, abrasive wear, fatigue wear and brittle fracture and flaking of hard particles.

关 键 词：原位反应 表面复合材料 碳化钽 灰铸铁(TaC Fe) 摩擦磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]