三维互穿网络结构Al/RSiC复合材料的制备及性能

Preparation and Property of Al/RSiC Composites with Three Dimensional Interpenetrating Network Structure

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181MPa;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 34G to 17G, the bending strength of the composite first increased slightly then decreased, and reached the largest value of 181 MPa with the ceramics of 28G 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 eofficients of the composites.