アルミナ短繊維およびVGCFハイブリッド強化アルミニウム合金複合材料の諸特性

抄録

In order to obtain a material having the high-temperature strength, wear resistance and damping capacity, the preforms of VGCF adhered to the surface of short alumina fibers were prepared and infiltrated with molten aluminum alloy using the squeeze casting. The volume fraction of alumina fiber was 15 vol% and that of VGCF was varied from 0~9 vol%. Optical and electron microscopy, wear test under dry sliding conditions and damping tests were carried out. Although there was no agglomeration of the VGCF in the composite when the volume fraction of VGCF was 3 vol%, agglomeration was observed when 6 and more volume percent of VGCF was added. The hardness of the composite with 9 vol% VGCF was smaller than the unreinforced alloy, but that with 3 and 6 vol% VGCF was equivalent to that of the unreinforced alloy. While there was no clear improvement in wear resistance due to the reinforcements under low-sliding velocity, the wear loss of the composites was significantly lower than that of the unreinforced alloy under high-sliding velocity.