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镀钛金刚石/铜复合材料的热导率

DOI: CNKI:11-1801/TB.20110720.1333.002, PP. 184-188

Keywords: 金刚石/铜复合材料,热导率,界面,钛镀层

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Abstract:

采用粉末冶金法在高温热压炉中制备金刚石/铜复合材料,研究了钛镀层、烧结温度、金刚石颗粒体积分数对金刚石/铜复合材料热导率的影响。结果表明:钛镀层能改善金刚石/铜复合材料的界面浸润性,降低孔隙率,提高热导率。烧结温度低于980℃时,烧结驱动力不足,致使金刚石/铜复合材料的致密度下降,热导率降低;烧结温度高于980℃时,由于铜和金刚石的热膨胀性能相差较大,冷却过程中铜和金刚石颗粒容易在界面处分离,致使金刚石/铜复合材料的致密性和热导率降低。随着高热导金刚石颗粒体积分数的增加,铜不能充分填充金刚石颗粒之间的孔隙,降低了金刚石/铜复合材料的致密度,致使热导率先增加后降低。

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