炭化けい素-アルミニウム三次元等方性複合材料の調製と機械的性質
1992 年 42 巻 5 号 p. 293-298
詳細
1992 年 42 巻 5 号 p. 293-298
Using a porous body of silicon carbide which forms a three-dimensional network structure, SiC-aluminum composites were prepared by the liquid phase hot-pressing technique: the porous SiC was infiltrated with molten aluminum under pressure. Each of silicon carbide and aluminum forms a three-dimensional network structure intermingling with each other and the composite shows the following unique properties compared with conventional aluminum matrix composites. The composites are macroscopically isotropic. The compressive strength is 1.2GPa at room temperature and this value is retained up to 473K. Beyond 473K, it decreases gradually with increasing temperature to 0.5GPa at 673K. The bending strength and coefficient of thermal expansion are 480 MPa and 7.5 × 10-6/K, respectively. The Young's modulus is isotropically 230GPa. This value is higher than that of isotropic particle-dispersed aluminum composite, and comparable with that of fiber-reinforced aluminum composite in longitudinal direction but higher than that in transverse direction.
