以不同孔隙率(17％,23％,28％,34％)RSiC 陶瓷为基体,以 ZL102铝合金为第二相,采用真空压力熔渗法制备了Al/RSiC复合材料,研究了 RSiC 陶瓷孔隙率对该复合材料性能的影响。结果表明：Al/RSiC复合材料具有双连续三维互穿网络结构,陶瓷相和金属相在三维空间连续分布；当RSiC陶瓷孔隙率由34％下降到17％时,复合材料的抗弯强度先略有升高后下降,当陶瓷孔隙率为28％时达到最大,为181 MPa；复合材料的热膨胀系数随着陶瓷孔隙率的减小而降低,且低于理论计算值,RSiC陶瓷的三维网络结构对复合材料的热膨胀性能起决定性作用。
With RSiC ceramics of different porosities (17%,23%,28%,34%)as substrate and ZL102 Al alloy as second phase,the Al/RSiC composites were prepared by vacuum pressure infiltration method and the effects of the porosities of RSiC ceramics on their properties were investigated.The results show that the Al/RSiC composites had the co-continuous three-dimensional interpenetrating network structure, meaning a continuous distribution of ceramics and metal phases in three-dimensional space.When the porosity of RSiC ceramics decreased from 34% to 17%,the bending strength of the composite first increased slightly then decreased,and reached the largest value of 181 MPa with the ceramics of 28% porosity.The thermal expansion cofficient of the composite decreased with the decrease of ceramics porosity and was below the theoretical calculation value.The three dimensional network structure of RSiC ceramics played a decisive role on the thermal expansion cofficients of the composites.
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