聚碳硅烷对注射成形Fe-2Ni基复合材料显微组织和力学性能的影响

Influence of Polycarbosilane addition on mechanical properties and microstructure of Fe-2Ni matrix composites prepared by MIM

采用粉末注射成形工艺,以聚碳硅烷（PCS）为先驱材料,制得SiC颗粒增强的Fe-2Ni基复合材料;研究PCS对Fe-2Ni合金的致密度、显微组织、力学性能及断口的影响。结果表明：PCS裂解生成的SiC增强相颗粒细小,在基体材料中分布均匀,加入5%-10%（体积分数）PCS可使材料抗拉强度提高43%-62%,洛氏硬度提高40%-47%,但伸长率下降,由韧性断裂转变成脆性断裂;Fe-2Ni基复合材料的强度和硬度达到了MIM协会的标准,优于SiC颗粒增强的Fe基复合材料。

The influences of Polycarbosilane（PCS） on density, microstructure, mechanical properties and fracture of injection molded Fe-2Ni matrix composit are investigated. The results show that： the reinforced phase of SiC pyrolysised by PCS distributes homogeneously in matrix, comparig with the samples without PCS the tensile strength of the composites with 5%-10%PCS increases about 43%-62% and the HRB hardness increases about 40%-47%, while the elongation rate obviously drops down and the fracture changes from tough fracture to brittle fracture. The above strength and hardness of the Fe-2Ni composites satisfies the standard of the Metal Injection Molding（MIM） Association and are better than SiC/Fe matrix composites.