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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Influence of particle content and porosity on the wear behaviour of cast in situ Al(Mn)-Al{sub}2O{sub}3(MnO{sub}2) composite
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Influence of particle content and porosity on the wear behaviour of cast in situ Al(Mn)-Al{sub}2O{sub}3(MnO{sub}2) composite

机译：颗粒含量和孔隙率对原位铸造Al（Mn）-Al {sub} 2O {sub} 3（MnO {sub} 2）复合材料磨损性能的影响

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摘要

Aluminium-based tribological materials may reduce the weight of components, leading to significant fuel economy. The aim of the present study is to investigate the wear and friction in cast in situ Al(Mn)-Al{sub}2O{sub}3(MnO{sub}2) composites synthesized by dispersing MnO{sub}2 particles in molten aluminium, which get reduced to form Al{sub}2O{sub}3 particles. Wear tests have been conducted at four normal loads of 9.8, 19.6, 29.4 and 39.2 N and at a constant sliding speed of 1.0.5 m/s using a pin-on-disc wear testing machine, under dry sliding conditions. The results of the investigation indicate that the cumulative volume loss and wear rate of in situ composites are significantly lower than those observed in either the commercial aluminium or Al-Mn base alloy, under similar loading and sliding conditions. The influences of both reinforcing particle and porosity contents on the tribological behaviour of in situ composites were evaluated. It has been found that at a given particle content, the wear rate increases with increasing porosity content due to its combined effect on real area of contact and subsurface cracking. The wear rate of in situ composites with relatively lower porosity decreases with increasing particle content, but does not appear to change significantly or even increases a little with increasing particle content when the composites have relatively higher porosity. In view of large fluctuations in coefficient of friction during sliding, no effect of particle or porosity contents on the coefficient of friction could be determined unambiguously for different in situ composites.
机译：铝基摩擦材料可以减轻组件的重量，从而显着节省燃料。本研究的目的是研究通过将MnO {sub} 2颗粒分散在熔融态中而制备的原位铸造Al（Mn）-Al {sub} 2O {sub} 3（MnO {sub} 2）复合材料的磨损和摩擦铝，它们被还原形成Al {sub} 2O {sub} 3颗粒。使用销盘式磨损试验机在干式滑动条件下，在9.8、19.6、29.4和39.2 N的四个正常载荷下以及1.0.5 m / s的恒定滑动速度下进行了磨损测试。研究结果表明，在相似的载荷和滑动条件下，原位复合材料的累积体积损失和磨损率显着低于商用铝或Al-Mn基合金。评估了补强颗粒和孔隙率含量对原位复合材料摩擦学行为的影响。已经发现，在给定的颗粒含量下，磨损率随着孔隙率含量的增加而增加，这是由于其对接触的实际面积和地下裂纹的综合影响。孔隙率相对较低的原位复合材料的磨损率随颗粒含量的增加而降低，但当孔隙率相对较高时，似乎不会随着颗粒含量的增加而显着变化甚至略有增加。考虑到滑动过程中摩擦系数的较大波动，对于不同的原位复合材料，无法明确确定颗粒或孔隙率含量对摩擦系数的影响。

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