Thermal Properties of Diamond Particle Dispersed Aluminum Matrix Composites Fabricated in Continuous Solid-Liquid Co-Existent State by SPS
Thermal Properties of Diamond Particle Dispersed Aluminum Matrix Composites Fabricated in Continuous Solid-Liquid Co-Existent State by SPS
复制标题
SPS连续固液共存状态下制备金刚石颗粒分散铝基复合材料的热性能
DOI：
10.2497/jjspm.56.438
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Y. Makino
中科院分区：
文献类型：
--
作者：
K. Mizuuchi;K. Inoue;Y. Agari;Y. Morisada;M. Sugioka;Motohiro Tanaka;T. Takeuchi;J. Tani;M. Kawahara;Y. Makino
采用放电等离子烧结（SPS）技术，以金刚石粉末、纯Al粉末和Al-5mass%Si合金粉末为原料，在连续固液共存状态下制备了金刚石颗粒弥散分布的Al基复合材料。研究了复合材料的微观结构和导热性能。在SPS过程中，通过在798 K和876 K之间的温度范围内加热1.56 ks，这些复合材料都得到了很好的固结。在本研究中所采用的烧结条件下制备的复合材料的扫描电子显微镜观察金刚石颗粒和Al基体之间的界面处没有反应。在金刚石的体积分数为45%至50%的范围内，所制造的金刚石-Al复合材料的相对堆积密度为99%或更高。含有50体积%的金刚石-Al复合材料的热导率金刚石的热导率达到552 W/mK，约为使用Maxwell-Eukken方程估计的理论热导率的95%。复合材料的热膨胀系数落在Kerner模型的上线，表明复合材料中金刚石颗粒与Al基体之间存在较强的结合。
Diamond-particle-dispersed-aluminum (Al) matrix composites were fabricated in continuous solid-liquid co-existent state by Spark Plasma Sintering (SPS) process from the mixture of diamond powders, pure Al powders and Al-5mass%Si alloy powders. The microstructures and thermal conductivities of the composites fabricated were examined. These composites were all well consolidated by heating at a temperature range between 798 K and 876 K for 1.56 ks during SPS process. No reaction at the interface between the diamond particle and the Al matrix was observed by scanning electron microscopy for the composites fabricated under the sintering conditions employed in the present study. The relative packing density of the diamond-Al composite fabricated was 99 % or higher in a volume fraction range of diamond between 45 % and 50 %. Thermal conductivity of the diamond-Al composite containing 50 vol.% diamond reached 552 W/mK, approximately 95 % the theoretical thermal conductivity estimated using Maxwell-Eucken's equation. The coefficient of thermal expansion of the composites fell in the upper line of Kerner model, indicating strong bonding between the diamond particle and the Al matrix in the composite.