热压烧结Al_2O_3/Fe-28Al-5Cr复合材料的组织和性能  

Microstructures and Properties of Al_2O_3 /Fe-28Al-5Cr Composites Prepared by Hot-Pressed Sintering

作　　者：徐建林[1] 甄乾[1] 张兴华[2] 马吉强[2] 李斐[2] 杨军[2] 

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000

出　　处：《机械工程材料》2013年第10期34-38,43,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51275507;51201172)

摘　　要：在自制的Fe-28Al-5Cr合金粉中加入质量分数为10%和20%Al2O3陶瓷颗粒,采用热压烧结技术制备了Fe-28Al-5Cr基复合材料,研究了Al2O3加入量对复合材料组织、力学性能及高温耐磨性能的影响。结果表明:所制备复合材料的相对密度达到99%以上,复合材料由Fe3Al基体和Al2O3增强相组成;Al2O3在复合材料中主要分布在晶界处,当Al2O3的加入量为20%时,形成了连续的网状结构;复合材料的强度比基体合金的低,且其强度随Al2O3含量的增加而降低,但加入20%Al2O3的复合材料的高温耐磨性能比基体合金的有明显改善。Fe-28AF5Cr based composites were prepared by adding 10wt% and 20wt% Al2O3 ceramic particles into self-made Fe28Al-SCr alloy powders and following hot-pressed sintering, and the effects of Al2O3 content on microstructure, mechanical and high-temperature wear properties of the composites were studied. The results show that the relative density of the composites up to 99%0, and the composites were composed of FeaAl matrix and Al203 enhanced phase. A1203 mainly distributed at grain boundary of FeaA1, which leaded to the formation of net-structured Al203 when Al203 adding contents reached to 20wt% . The strength of the composites was lower than that of the matrix, and it decreased with the increase of Al203 adding contents, but the high temperature wear resistance of the composite with 20wt% Al203 was improved obviously comparing with that of the matrix.

关 键 词：金属间化合物 Fe3Al基复合材料 AL2O3 热压烧结 强度 高温磨损 

分 类 号：TB332[一般工业技术—材料科学与工程]