Improvement of Friction and Wear Characteristics for Advanced Al-Si Alloy Matrix Composites

先进铝硅合金基复合材料摩擦磨损特性的改善

基本信息

批准号：
13650158
负责人：
GOTO Hozumi
金额：
$ 2.18万
依托单位：
Fukuoka Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650158/
关键词：
Al alloy-graphite composite Friction and wear Adhered film Material combination Drop feed lubrication Al-Si alloy Graphite アルミ炭素複合材アルミニウム合金基複合材料摩擦・摩耗材料の組み合せ潤滑油

项目摘要

Unlubricated pin-on-disk type wear tests of an Al-Si alloy impregnated graphite composite in contact with a bearing steel were conducted in dry and wet gas environments of argon, nitrogen, air and oxygen. The properties of an adhered film generated on the sliding surface of the bearing steel were investigated and then friction and wear characteristics of the composite were elucidated. The composite, having a humidity dependency, exhibits wear resistance and friction performance better than the matrices (Al-Si alloy and graphite) in wet gases, indicating that the improvement of tribological characteristics has been made by composing the matrices. The adhered film is generated on the sliding surface of the bearing steel just after the start of the tests and serves as an effective solid lubricating film, especially in wet gases. The mixture of Al-Si alloy wear particles in graphite powder promotes the formation of the films under press-slide fattening action. More compared films are gener … More ated with decreasing oxygen in the wet gas environment and contribute to the improvement of wear resistance of the composite. Pin lifting i.e. negative wear takes place in wet gases during the initial stage and subsequently lower wear occurs with increasing pin lifting height.In order to investigate the good mating materials in sliding contact with the Al-Si alloy impregnated graphite, pin-and-disk type wear tests were conducted and the material combination showing minimum friction and wear was obtained. The composite in contact with itself yields low friction and wear, indicating the best material combination. Ferrous metals such as mild steel, cast iron, bearing steel and commercial thrust bearing in contact with the composite exhibit low friction and middle levels of wear rate, showing better material combinations. The composite in contact with its matrices gives the middle levels of friction and wear, showing bad combinations. Titanium in contact with the composite brings about high friction and wear, resulting in an inadequate combination. Graphite, copper, brass and titanium in contact with the composite causes wear damage to themselves, leading to the most inadequate combinations for sliding surfaces.Unidirectional sliding wear tests of the Al-Si alloy impregnated graphite composite and it matrices (pin) in contact with the bearing steel (disk) were conducted using engine base oil to investigate the tribological characteristics under the lubrication methods of immersion feed or oil-drop feed only before the tests. In the case of the composite pin, as the amount of oil drop is increased, the friction coefficient and wear rate reach the values for the immersion test. The breakdown of oil film does not occur even with very small amount of oil-drop. For the Al-Si alloy pin, the sliding distance to the breakdown of an oil film tends to increase with the amount of oil drop. The wear scarcely occurs but the friction coefficient fluctuates greatly before the oil film breakdown and afterwards the friction and wear rapidity increase. In the case of the graphite pin, the friction coefficient and wear rate under oil-drop feed are lower than those under the immersion feed but the wear rate does not change irrespective of the amount of oil drop. These results suggest that the composite is one of the good sliding materials even under severe lubricating conditions compared with the matrices. Less

在与轴承钢接触的Al-Si合金浸渍石墨复合材料的非化合销型磨损试验中，在氩气，氮，空气和氧气的干燥和湿气体环境中进行。研究了在轴承钢的滑动表面上产生的粘附膜的性能，然后阐明了复合材料的摩擦和磨损特性。具有湿度依赖性的复合材料比湿气体中的材料（Al-Si合金和石墨）更好地表现出耐磨性和摩擦性能，这表明通过组成这些物品来改善摩擦学特征。在测试开始后，粘附的膜就在轴承钢的滑动表面产生，并用作有效的实心润滑膜，尤其是在湿气体中。 Al-Si合金在石墨粉末中磨损颗粒的混合物促进了在新闻滑动的肥胖作用下形成膜的形成。在湿气环境中，比较薄膜的比较较大，而氧气的减少则更多，并有助于提高复合材料的耐磨性。销钉提升，即在初始阶段进行负磨损，随后发生较低的磨损，并随着销钉的增加而发生。为了调查与Al-Si合金浸渍石墨的滑动接触时，进行了良好的交配材料，进行了销钉和磁盘型磨损测试，并获得了最小的摩擦和磨损的材料组合。与自身接触的复合材料会产生低摩擦和磨损，表明最佳材料组合。亚铁金属（例如低碳钢，轴承钢和商业推力）与复合暴露的低摩擦和中间磨损速率接触，显示出更好的材料组合。与其物质接触的复合材料可提供摩擦和磨损的中间水平，显示出不良的组合。与复合材料接触的钛会带来高摩擦和磨损，导致组合不足。与复合材料接触的石墨，铜，黄铜和钛会对自身的损害造成磨损，导致滑动表面的组合最不足。al-SI合金浸透石墨复合物和IT材料（PIN）的Unixirectional滑动磨损测试，使用发动机钢（DISK）进行机油，以调查机油（DISK）在机油中进行了供应，以进行机油（DISK）进行了进来。仅在测试之前进食。在复合引脚的情况下，随着油滴的量增加，摩擦系数和磨损速率达到了浸入式测试的值。即使用少量的油滴，油膜的崩溃也不会发生。对于Al-Si合金引脚，与油脂破裂的滑动距离往往会随着油滴的量增加。磨损几乎没有发生，但摩擦系数在石油膜破裂之前发生了很大的波动，然后摩擦和磨损速度增加。在石墨引脚的情况下，油滴进料下的摩擦系数和磨损速率低于浸入式饲料下的摩擦系数和磨损速率，但是无论油脂量的量如何，磨损速率都不会改变。这些结果表明，即使在严重的润滑条件下，该复合材料也是良好的滑动材料之一。较少的