SiC含量对铁基复合材料性能的影响  

Performance of iron-based composites reinforced by different SiC contents

作　　者：黄小琴[1] 左爱文 王哲 肖常安 罗丰华[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]湖南省电力勘测设计院电力设备厂,长沙410007 [3]湖南长高新材料股份有限公司,株洲412001

出　　处：《粉末冶金材料科学与工程》2014年第2期271-277,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：粉末冶金国家重点实验室创新基金资助项目(200902)

摘　　要：采用粉末冶金方法制备不同SiC含量的SiC/Fe-3Cu-C-2Ni-1.5Cr-0.5Mo复合材料，采用硬度计、扫描电镜、电子万能试验机、万能摩擦磨损试验机对材料进行测试，研究SiC含量对铁基合金密度、组织结构、力学性能和干摩擦磨损性能的影响规律，并探讨其摩擦磨损机理。结果表明：当SiC的加入量为0.5%～2%（质量分数）时，复合材料的密度和强度均降低，但硬度和耐磨性能显著提高；当SiC加入量达到5%时，复合材料的密度、强度、硬度及耐磨性能均大幅降低。SiC含量为1.5%的复合材料耐磨性能最佳并能保持良好的力学性能，有望在气门导管、传动小齿轮等机械零部件上得到运用。复合材料的磨损机理为粘着磨损和磨粒磨损。SiC/Fe-3Cu-C-2Ni-1.5Cr-0.5Mo iron-based composites with different contents of SiC were prepared by powder metallurgy. The density, microstructure, mechanical properties, dry friction and wear performance as well as the wear mechanism of the iron-based composites were studied by hardness tester, SEM, electronic universal testing machine, universal friction and wear testing machine. The results show that with the increase of SiC from 0.5% to 2%（mass fraction）, the density and strength of the composites decrease slightly, while hardness and wear resistance increase significantly. When the SiC content reaches 5%, the density, strength, hardness and wear resistance of the composites decrease dramatically. The composite with 1.5% SiC exhibits the best wear resistance and maintains relatively good mechanical properties, which is expected to have potential applications in mechanical components such as valve guide, driving pinion. The wear mechanism of the composite is adhesive wear and abrasive wear.

关 键 词：铁基复合材料 SIC颗粒 耐磨性能 磨损机制 

分 类 号：TB331[一般工业技术—材料科学与工程]