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采用粉末冶金法制备体积分数为50%、不同SiC颗粒尺寸(平均尺寸为23、38和75μm)的Al/SiC复合材料。研究SiC颗粒尺寸和退火对Al/SiC复合材料组织和性能的影响。结果表明,在所得复合材料中,SiC颗粒均匀分布在铝基体中。粗Si C颗粒能提高材料的热膨胀系数和热导率,细SiC颗粒降低材料的热膨胀系数和提高抗弯强度。经过400°C、6 h退火后,SiC颗粒的尺寸和形态没有发生变化,但材料的热膨胀系数和抗弯强度降低,热导率增大。退火后,SiC颗粒尺寸为75μm复合材料的热导率为156 W/(m·K),热膨胀系数为11.6×10~(-6)K~(-1),抗弯强度为229 MPa。
Al / SiC composites with volume fraction of 50% and different SiC particle sizes (average size 23, 38 and 75 μm) were prepared by powder metallurgy. The effects of SiC particle size and annealing on microstructure and properties of Al / SiC composites were investigated. The results show that in the resulting composite, the SiC particles are uniformly distributed in the aluminum matrix. Coarse Si C particles can improve the thermal expansion coefficient and thermal conductivity of materials, fine SiC particles reduce the thermal expansion coefficient of the material and improve the bending strength. After annealing at 400 ° C for 6 h, the size and morphology of SiC particles did not change, but the thermal expansion coefficient and flexural strength decreased, and the thermal conductivity increased. After annealing, the thermal conductivity of SiC composites with a size of 75 μm was 156 W / (m · K), the thermal expansion coefficient was 11.6 × 10 -6 K -1, and the flexural strength was 229 MPa.