SiC_p颗粒增强耐热铝基复合材料孔隙率与力学性能

来源期刊：中南大学学报(自然科学版)2002年第2期

论文作者：李云平 李溪滨

文章页码：177 - 180

关键词：耐热铝基复合材料;颗粒;热挤压;孔隙率

Key words：heat resistant aluminummatrix composites; particulate; hot extrusion; viscosity

摘    要：通过真空热压、热挤压工艺制备的SiC_p/Al-Fe-V-Si复合材料,在室温和高温时的强度均高于基体材料在室温和高温时的强度:SiC_p体积分数分别为5%,10%和15%时,复合材料Al-Fe-V-Si在室温时的断裂强度分别比基体材料的断裂温度增加了48.2%,63.3%,24.4%;在400℃时其断裂强度分别比基体的断裂强度增加了49.6%,53.3%,19.0%.复合材料随着SiC_p含量的增加而使孔隙率增加,导致材料力学性能的增加幅度降低.此外,通过分析材料力学性能与材料孔隙率的关系,研究了SiC_p/Al-Fe-V-Si复合材料的颗粒强化机制与材料孔隙率交互作用机理,得出了复合材料孔隙率θ,φ(SiC_p)与材料断裂强度σ_b¹的关系,对颗粒增强耐热铝基复合材料的生产具有理论意义.

Abstract: The strengths of SiC_p/Al-Fe-V-Si at different temperatures are higher than that of the matrix, the composites were produced by vacuum hot pressing and hot extrusion. The tensile strengths of three kinds of composites 5% SiC_p/Al-Fe-V-Si, 10% SiC_p/Al-Fe-V-Si, 15% SiC_p/Al-Fe-V-Si are increased by 48.2%, 63.3%, 24.4% at ambient temperature, and increased by 49.6%, 53.3%, 19.0% at400℃respectively. The authors have also studied interaction of strengthening mechanism of SiC_p with material and the viscosity produced by SiC_p. The relationship of content of SiC_p, viscosity (θ) and the tensile strength of material (σ¹_b) was studied, which would be of great importance in research and production.