【摘要】 采用无压渗透法制备了SiCp/Al复合材料,经过不同预处理,以及含不同组元的SiCp/Al复合材料,在热机械分析仪中进行20～180℃热循环,测试复合材料热循环后的长度变化。以单位长度的变化,即残余应变来分析热循环后尺寸稳定性。结果表明,SiCp/Al复合材料在热循环后会产生残余应变,残余应变随热循环次数增加而减小,尺寸趋于稳定。预处理的不同,热循环后残余应变也不同,冷热循环预处理的热循环后残余应变最小。SiCp/Al复合材料中颗粒尺寸较大以及基体较硬,则复合材料热循环后尺寸稳定性也较高。更多还原

【Abstract】 The length changes of different preheated SiCp/Al composites with varied compositions prepared by pressure free infiltration method were measured by TMA (thermal mechanical analysis) after heat recycled at 20～180 ℃,in which the unite length changes,mamely residual strain ,was used to analyze the dimensional stability.The results show that residual strain occuring in heat recycled SiCp/Al composites is reduced to be a constant value with the increase of heat recycling times.There exists different residual strain at different pretreatment,in which the minimum residual strain can be obtained by cooling-heating recycled pretreatment.SiCp/Al composites with a big particle size and hard matrix possesses a higher dimensional stability after heat recycle.更多还原