不同SiC含量注射成形SiCP/Cu复合材料的显微组织与力学性能

采用粉末注射成形工艺成形了SiCP/Cu复合材料,再采用溶剂脱脂、热脱脂和烧结的工艺制备了复合材料试样。研究了成形过程中复合材料显微组织的变化,并研究了烧结后的显微组织、力学性能、磨损性能。研究结果表明：SiCP/Cu复合材料在1050°C且在H2保护下烧结状况良好；复合材料的抗拉强度取决于SiC颗粒的体积分数以及其在基体中的分布状况；SiC含量为5vol.%和10vol.%,微裂纹萌生于SiC颗粒与基体的界面处；SiC含量为15vol.%,微裂纹萌生于SiC颗粒与基体。SiC体积分数为5%、10％、15％的SiCP/Cu复合材料的抗拉强度分别为254MPa、 291 MPa和278MPa。复合材料的力学性能随SiC含量的升高先升高后降低,而其磨损性能随SiC含量的增加而增加。

Microstructure and mechanical properties of metal injection molded SiCP/ Cu composites with different SiC contents

SiCP/Cu composite was preformed by Powder Injection Molding process, and was solvent degreased and hot degreased subsquently, and then was sintered. Microstructure evolution, mechanical properties and wear resistance of SiCP/Cu composite were investigated. The research results show that SiCP/Cu were sintered sucessfully at a temperature of 1050°C with hydrogen protection. The tensile strength of the composite depends on the fraction of SiC particles and their distribution in the matrix. Microcracks nucleate at the interface of the matrix and SiC particles in the composite of 5vol.%SiC and 10vol.%SiC, while they nucleate in the Cu matrix between SiC particles in the composite of 15 vol.%SiC. The tensile strengths of 5vol.%, 10vol.%, and15vol.%SiCP/Cu are 254MPa, 291MPa and 278MPa separately. Mechanical property of the composite increases with SiC particle volume fraction increasing to 10% and then decreases with volume fraction of the SiC particle increasing further. Wear resitance of the composite enhances with particle volume fraction increaseing from 10% to 15%.