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以氧化结合制备的SiC多孔骨架为先驱体,采用无压渗透工艺制备出致密、增强体分布高度均匀的纯铝基复合材料。SiC预成形坯渗入纯铝后无形状和尺寸的变化。加入SiC后,铝基体的强度提高至300MPa以上,弹性模量提高至120GPa以上且随SiC含量的增加而增大。复合材料的热膨胀性能可通过SiC的含量来调整,当SiC的体积含量介于39%至62%之间时,室温至100℃的平均线热膨胀系数介于12.9×10-6/℃至9.11×10-6/℃之间。
The porous SiC matrix prepared by oxidative bonding was taken as the precursor, and the pure aluminum matrix composites with dense and reinforced body distribution were prepared by pressureless infiltration process. SiC preform infiltration pure aluminum without shape and size changes. After SiC was added, the strength of the aluminum matrix was increased to more than 300MPa, the elastic modulus increased to above 120GPa and increased with the SiC content increasing. The thermal expansion of the composites can be adjusted by the content of SiC. When the volume fraction of SiC is between 39% and 62%, the average linear thermal expansion coefficient from room temperature to 100 ℃ is between 12.9 × 10-6 / ℃ and 9.11 × 10-6 / ℃ between.