SiC颗粒增强Al基复合材料的热膨胀性能

采用气压浸渗方法制备了SiCp/Al(SiC颗粒增强铝基复合材料),由于浸渗程度的不同导致了复合材料密度的不同,研究了复合材料的工程CTE和物理CTE随密度的变化关系.实验结果表明,对于给定的SiC颗粒增强Al基复合材料,随着密度的增加工程CTE会出现3个不同斜率近似线性的增长,同时密度的增加会导致工程CTE下降,物理CTE突变点的温度升高,但是物理CTE突变点的值却不受密度的影响.

THERMAL EXPANSION PROPERTIES OF SILICON CARBIDE PARTICLE REINFORCED ALUMINUM

Silicon carbide particle reinforced AlSi12 composite was fabricated by vacuum gas pressure infiltration technology.Different infiltration extent resulted in varied density.The relationship of density and CTE(linear and physics) was studied.In the condition of same SiC particle and aluminum matrix,the experiment results show that increasing of density results in three different slopes,which are approximate to linear.And the increasing of density leads to falling of linear CTE and increasing of the temperature of phys CTE's inflexion spot,however density has no effect on phys CTEs.