【摘要】 通过添加适量的Al₂W₃O₁₂负热膨胀粉体来优化碳化硅颗粒增强铝基（SiC_p/Al）复合材料的热膨胀系数。实验采用固相法制备负热膨胀性能的Al₂W₃O₁₂粉体,并按10%,20%,30%的体积比添加至SiC_p/Al复合粉体中,利用粉末冶金工艺制备SiC_p/Al₂W₃O₁₂/Al复合材料。实验结果表明:制备的复合材料组织分布均匀,致密度良好。室温到200℃内,在Al基体质量分数不变的前提下,Al₂W₃O₁₂的加入有效降低了复合材料的热膨胀系数。更多还原

【Abstract】 Suitable amount of negative thermal expansion materials Al₂W₃O₁₂ was added to optimize the thermal expansion coefficient of SiC_p/Al composite materials.Negative thermal expansion Al₂W₃O₁₂ powders were firstly prepared by solid state reaction.By adding 10%,20%,30%（volume ratio）Al₂W₃O₁₂to the SiC_p/Al composite powders,SiC_p/Al₂W₃O₁₂/Al composites were fabricated by powder metallurgy（P/M）technology.The experimental results showed that the composites with uniform organization and relatively high density were obtained.In the temperature range from room temperature to 200℃,the thermal expansion coefficient of the composites with the same mass ratio of Al was effectively reduced by increasing the amount of Al₂W₃O₁₂.更多还原