用无压浸渗的方法制备了高体积分数的SiC/Al复合材料.通过改变SiC预制样品的烧结工艺来改变SiC和Al的界面状况,分析了SiC表面SiO2层的变化对SiC/Al复合材料的热膨胀系数的影响.用无压浸渗的方法可得到常温下热膨胀系数为(5.68～7.12)×10-6/K的SiC/Al复合材料.颗粒大小一定时,复合材料的热膨胀系数随着SiO2界面层的厚度增加而减小.当界面SiO2层厚度从45 nm增加到2100 nm时,常温下热膨胀系数从7.12×10-6/K减小到5.68×10-6/K.
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