粉浆浇注-溶渗法制备Fe-WC-Cu复合材料.pdfVIP

维普资讯 学兔兔 第 18卷第3期 粉 末 冶 -~-zr．业 Vo1．18 No．3 2008年 6月 POWDER METALLURGY INDUSTRY June 2008 粉浆浇注一溶渗法制备Fe—WC—Cu复合材料 邹仕民，曹顺华，李春香’ (中南大学 粉末冶金国家重点实验室，长沙 410083) 摘 要：利用粉浆浇注一熔渗法制备了Fe-WC—Cu复合材料。研究了球磨时间、PH值、六偏磷 酸钠(NaPO。) 含量对粉浆流动性的影响。利用浇注方向上等距离位置硬度的变化，定性地 研究了WC的分布，并用金相结果进行佐证。结果表明：当球磨时间为24 h、pH值为11、加入 (NaPO。) 为0．5 时，粉浆具有最好的流动性；Fe—WC生坯密度在粉末装载量为75 时达到 最大值；采用合适的预烧工艺可以调节其孔隙度；在Fe—WC—Cu复合材料中WC不产生偏析。 关键词：粉浆浇注；梯度；Fe基复合材料 中图分类号：TF124．35 文献标识码：A 文章编号：1006—6543(2008)03—0005—04 PREPARATIoN oF Fe—WC—Cu CoMPoSITE BY SLIP CASTING／INFILTRATIoN ZOU Shi—min，CAO Shun-hua，LI Chun-xiang (State Key Laboratory of Powder Metallurgy，Central South University，Changsha 410083，China) Abstract：Fe—WC-Cu composite was produced by slip casting and infiltration．The effects of pH value and sodium hexametaphosphate(NaPO3)6 content on slurry fluidity were stud— ied．Change in hardness of composite with the distance from casting stream was used to deter— mine the distribution of WC，and the results were examined by metallographical observa— tion．The results show that slurry with pH value of 1 1 and(NaPO3)6 content of 0．5 had best fluidity；Green density of samples with 75 loading was the highest；The porosity could be controlled by appropriate pre—sintering process；No segregation of WC in Fe—WC-Cu com— posite was observed． Key words：slip casting；gradient；Fe—based composite 颗粒增强金属基复合材料(MMCs)因其优异 本实验通过合理调节Fe—WC浆料的流动性，制 的综合性能和良