Dry sliding wear behaviour of Al(Mg)/Al2O3 interpenetrating composites produced by a pressureless infiltration technique
Dry sliding wear behaviour of Al(Mg)/Al2O3 interpenetrating composites produced by a pressureless infiltration technique
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DOI：
10.1016/j.wear.2009.07.014
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发表时间：
2010-01-04
期刊：
影响因子：
5
通讯作者：
Higginson, Rebecca
中科院分区：
文献类型：
--
作者：
Chang, Hong;Binner, Jon;Higginson, Rebecca
用陶瓷颗粒或纤维增强的铝合金，由于其优越的性能，是高性能应用的理想材料。本文采用al - 8wt .% Mg合金对凝胶铸造的Al2O3泡沫进行了无压渗透。在干滑动条件下测试了合金和Al(Mg)/Al2O3互渗复合材料的磨损率；研究了不同载荷和滑动距离下Al2O3泡沫密度和孔尺寸对复合材料耐磨性的影响。在最初的250 m滑动距离后，所有复合材料都观察到“犁地”机制，而具有较高泡沫密度的复合材料随着滑动距离呈现“两阶段”磨损。第二阶段磨损率的降低主要是由于Al2O3网络从磨损表面伸出，保护了反球对Al（Mg）合金的直接磨损。在研究的范围内，更大的电池尺寸可以获得更好的耐磨性。(C) 2009 Elsevier B.V.版权所有
Aluminium alloys, reinforced with ceramic particles or fibres, are desired materials in high performance applications due to their superior properties. In this paper, gel-cast Al2O3 foams were pressurelessly infiltrated using an Al-8 wt.% Mg alloy. The wear rates of the alloy and the Al(Mg)/Al2O3 interpenetrating composites were tested under dry sliding conditions; effects of Al2O3 foam density and cell size on the composite wear resistance under different loads and sliding distances were investigated. A 'ploughing' mechanism was observed in all the composites after an initial 250 m sliding distance, whilst the composites with the higher foam density show a 'two-stage' wear with sliding distance. The decrease in the wear rate in the second stage in the latter is attributed to an Al2O3 network protruding out of the worn surface, which protects the direct wear of the Al(Mg) alloy by the counter ball. Within the range studied, a larger cell size is preferred for better wear resistance. (C) 2009 Elsevier B.V. All rights reserved.