【摘要】 采用粉末注射成形／无压浸渗法成功制备出了 SiC 体积分数为63％的 SiC_p／Al 复合材料．重点研究了主要工艺参数对 SiC 骨架及复合材料性能的影响规律．研究表明,采用粉末注射成形制备的 SiC 骨架经1100℃预烧后,仍具有很高的开口孔隙率,达到总孔隙率的97．9％．SiC 颗粒经高温氧化处理后所生成的 SiO₂薄膜可明显改善铝合金熔液与 SiC 颗粒之间的润湿性,显著提高复合材料的密度．通过对工艺参数的优化可使铝液较好地润湿 SiC 骨架,获得最高相对密度可超过 97％的复合材料．更多还原

【Abstract】 SiCp/Al composites with 63% SiC in volume fraction were successfully prepared by powder injection molding and pressureless infiltration.The effects of major processing parameters on the properties of SiC preforms and SiCp/Al composites were investigated.The results showed that SiC preforms pre-fired at 1 100℃or lower temperature exhibited high open porosity,which is over 97.9% of the whole porosity. The SiO₂ film resulting from the oxidation of SiCp at high temperature can remarkably enhance the wetta- bility of SiCp by A1 alloy liquid,leading to a significant increase in density of the composites.After opti- mization of the processing parameters,the SiC performs were well wetted by Al alloy liquid.As a result,an SiCp/Al composite with a higher relative density of over 97% was obtained.更多还原