Ceramic particles reinforced iron matrix composites were prepared by the dynamic temperature resistant hot press technology.The wear resistance of the iron matrix composites reinforced by monolithic particles (SiC,TiC,TiN) and hybrid particles mixture (TiC+TiN,SiC+TiN,SiC+TiC) under high volume fraction of 25％,30％ and 35％ were investigated.The results show that when using monolithic particle as reinforcement,the wear resistance of the TiNp/Fe composite is the best among the three monolithic composites,the TiCP/Fe is the second and the SiCP/Fe is the worst.The wear resistance of (TiC+TiN)P/Fe is better than that of the composites reinforced by corresponding monolithic particles,which represents the great effect of hybrid strengthening.When the volume fraction of particles is 30％,the wear resistance of the (TiC+TiN)P/Fe composite increases the most and the wear loss decreases by 51.9％ and 44.1％ than that of the TiCP/Fe and TiNp/Fe,respectively.However,the wear resistance of (SiC+TiC)P/Fe and (SiC+TiN)P/Fe composites are between that of the two corresponding monolithic composites.The microstructure of worn surfaces shows that the wear mechanism of the (TiC+TiN)P/Fe composite is abrasive wear,while that of the (SiC+TiN)P/Fe and (SiC+TiC)P/Fe are fatigue and abrasive wear.%采用电流直加热动态热压烧结工艺制备陶瓷颗粒增强铁基复合材料,研究高体积分数(25％,30％,35％)下,单一类型颗粒(SiC,TiC,TiN)及混合类型颗粒(TiC+TiN,SiC+ TiN,SiC+TiC)作为增强相对铁基复合材料磨损性能的影响.结果表明:单一类型粒子强化时,TiNP/Fe复合材料的耐磨性最好,TiCP/Fe次之,SiCp/Fe最差.混合粒子作为增强体时,(TiC+ TiN)P/Fe复合材料磨损性能显著优于其对应的单一颗粒增强材料;其中粒子含量为30％时,(TiC+TiN) P/Fe复合材料磨损性能提高最大,其磨损量比TiCP/Fe降低了51.9％,比TiNp/Fe复合材料降低了44.1％,体现出可贵的混合增强价值.(SiC+TiC)P/Fe和(SiC+ TiN)P/Fe复合材料的磨损性能分别处于对应的两个单一颗粒增强材料之间.磨损表面观察表明,耐磨性好的(TiC+ TiN)P/Fe复合材料的磨损机理为磨粒磨损,而(SiC+ TiC)P/Fe和(SiC+TiN)P/Fe复合材料除磨粒磨损外还存在明显的疲劳磨损现象.
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