The effect of milling and sintering techniques on mechanical properties of Cu-graphite metal matrix composite prepared by powder metallurgy route
The effect of milling and sintering techniques on mechanical properties of Cu-graphite metal matrix composite prepared by powder metallurgy route
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DOI：
10.1016/j.jallcom.2013.03.122
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发表时间：
2013-08-25
影响因子：
6.2
通讯作者：
Chaira, D.
中科院分区：
文献类型：
--
作者：
Samal, C. P.;Parihar, J. S.;Chaira, D.
当铜用作电滑动触点时，需要大的接触力以维持有效的电流传输，而另一方面，建议具有尽可能小的接触力以减少滑动部件的磨损。在本研究中，铜-石墨金属基复合材料（MMC）是使用传统粉末冶金路线和放电等离子烧结（SPS）技术制备的。已经发现，由于石墨的软性质，在铜中添加石墨不会导致硬度的太大改善。然而，传统烧结样品和 SPS 样品的相对密度分别为 90% 和 97%。由于压力和火花等离子体效应的综合作用，通过 SPS 制造 Cu-1 vol.% 石墨 MMC 时，其最大维氏硬度达到了 100 左右。然而，当采用传统方法在 900 摄氏度下烧结 1 小时制造该复合材料时，其硬度值为 65。研究发现，研磨 20 小时后，MMC 的密度和硬度会因薄片形成和尺寸增加而降低，此后，随着颗粒形状变为不规则且尺寸减小，这些值会增加。 (C) 2013 Elsevier B.V. 保留所有权利。
When copper is used as electrical sliding contacts, a large contact force is desirable to maintain effective current transfer, whilst on other hand it is advisable to have as small as contact force as possible in order to reduce the wear of the sliding components. In the present investigation Cu-graphite metal matrix composites (MMCs) were prepared by conventional powder metallurgy route using conventional and spark plasma sintering (SPS) techniques. It has been found that addition of graphite into copper does not result in much improvement on the hardness due to the soft nature of graphite. However, 90% and 97% of relative density have been obtained for conventional sintered and SPS samples respectively. Maximum Vickers hardness of around 100 has been achieved for Cu-1 vol.% graphite MMC when it is fabricated by SPS due to the combined effect of pressure and spark plasma effect. However, a hardness value of 65 has been obtained for the same composite when it is fabricated by conventional sintering at 900 degrees C for 1 h. It has been found that density and hardness of MMCs decreases up to 20 h of milling due to flake formation and increase in size and after that these values increases as particle shape changes to irregular and size reduction takes place. (C) 2013 Elsevier B. V. All rights reserved.