摘要
采用原位反应结合热压烧结工艺制备了Al2O3质量分数为10%和20%的Fe-28Al-5Cr基复合材料,研究了它们的物相、显微组织、力学性能,以及室温和200,400,600,800℃下的摩擦磨损性能,并与采用外加Al2O3方法制备的相同复合材料进行了对比。结果表明:原位合成Al2O3制备的复合材料由Fe3Al和Al2O3两相组成,Al2O3主要分布在晶界处;随着Al2O3含量的增多,复合材料的硬度逐渐增大,抗弯强度明显降低;当Al2O3质量分数为20%时,复合材料的耐磨性能得到了明显改善;与外加20%Al2O3制备的复合材料相比,原位合成Al2O3制备的复合材料具有较高的硬度和强度,在室温和200,800℃下的磨损率稍低。
Fe-28Al-5Cr based composites with 10wt% and 20wt% in situ formed Al2O3 ceramic were produced by hot-pressing sintering method.Their phase,microstructure,mechanical properties and the friction and wear properties at room temperature,200,400,600,800℃ were investigated.In addition,as contrast materials, Al2O3/Fe-28Al-5Cr composite was produced by the method of adding Al2O3ceramic directly.The results show that the composites in-situ formed Al2O3ceramic were composed of Fe3Al and Al2O3 phases,and Al2O3 distributed predominately on the grain boundary of Fe3Al.The hardness of the composites increased gradually but the bending strength decreased dramatically with increasing Al2O3content,and when the mass fraction of Al2O3 was 20%,the wear resistance of the composite was obviously improved.Compared with the composite prepared by directly adding 20% Al2O3,the composite in-situ formed Al2O3ceramic possessed higher hardness and strength and lower wear rate at room temperature,200and 800℃
出处
《机械工程材料》
CSCD
北大核心
2014年第5期26-32,共7页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51275507
51201172)
