颗粒尺寸对真空浸渗SiC／Al复合材料性能的影响.pdfVIP

学兔兔 第19卷第6期 粉 末 冶 -~．-r业 VoL 19 NO．6 2009年12月 P0WDER METALLURGY INDUSTRY Dec．2009 颗粒尺寸对真空浸渗SiC／A1复合材料 能的影响 李飞舟 (宝鸡文理学院机电工程系，陕西 宝鸡 721007) 摘 要：采用无压浸渗法制备了sic／Al复合材料，考察了复合材料中SiC颗粒尺寸对复合材 料的组织结构、抗弯强度、摩擦磨损性能的影响。结果表明：随着SiC颗粒尺寸的减小，SiC／Al 复合材料的残余气孔率逐渐减小，密度和抗弯强度逐渐增加；粒度配比有利于提高复合材料的 抗弯强度。与灰铸铁配副时，材料的摩擦系数与磨损率明显依赖于碳化硅颗粒尺寸，二者均随 颗粒尺寸的增大而先降低后增大。粒度配比能明显改善复合材料的干摩擦磨损性能。粗细颗 粒的粒度配比具有相互强化的作用，有利于降低摩擦系数和磨损率，并使其趋于稳定。 关键词：sic／Al；复合材料；颗粒尺寸 中图分类号：TF123．3 1 文献标识码：A 文章编号：1006—6543(2009)06—0044—05 INFLUENCE OF PARTICLES SIZE ON PROPERTIES OF SiC／Al COMPOSITES PREPARED BY VACAUM INFILTRATION TECHNIQUE LIFei-zhou (Department of Mechanical and Electrical Engineering Baoji university of arts and scinces，Baoji 721007，China) ， Abstract：The effect of particle size on microstructure，bending strength，friction and wear properties of SiC／A1 composite produced by pressureless infiltration technique were investi— gated．It was shown that density，bending strength and dry frictional and wear properties of SiC／A1 composite was improved obviously with particles size reduction due to reduction of residual porosity．Thus the bending strength of composite could be increased by optimum sige blending．When matched with gray cast iron，friction coefficient and wear rate of the corn— posite are greatly dependent on the particle size．Both of them firstly are decreased and then increased with the inc