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Tribofilm Formation by Tribo-Sintering of Nanometer-Sized Particles

通过纳米尺寸颗粒的摩擦烧结形成摩擦膜

基本信息

批准号：
16360082
负责人：
KATO Hirotaka
金额：
$ 7.42万
依托单位：
Fukui National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

When nanometer-sized particles, which have high surface energy, are artificially supplied on rubbing surfaces, wear-protective tribofilms are formed on the surfaces. The previous study has demonstrated that the supply of nanoparticles of an oxide of high diffusion rate, such as Fe_2O_3, SnO_2, CuO, or Bi_2O_3, induced transition to mild wear with sliding distance. The mild wear was due to the formation of the wear-protective tribofilms on the rubbing steel surfaces, and observations confirmed that the tribofilms were produced by tribo-sintering of the supplied oxide particles. Therefore, it is expected that the tribofilms produced by the supply of nanoparticles reduce wear even if no particles exist on the surfaces.The purpose of this project is to study wear behavior of the tribofilms produced by the supply of nanoparticles on the steel surfaces. Particularly, the influences of the type and size of supplied particles on the wear of the produced tribofilms have been investigated in detail.Tribofilms were produced in air or vacuum(8x10^<-4> Pa) by using a pin-on-disc wear machine. The pin and disc specimen material is normalized 0.45 mass% carbon steel. The supplied particles were CuO(mean particle diameter : 48nm), Fe_2O_3(30nm), SnO_2(21nm) or Bi_2O_3(51nm) oxide in the case of air atmosphere, and Cu(50nm, 1μm) in the case of vacuum atmosphere.It was found that the tribofilms produced by the supply of nanoparticles on the rubbing surfaces reduced the wear considerably, depending on the type of the supplied particles. Particularly the sliding distance of the mild wear transition was the longest for the tribofilms by the supply of Bi_2O_3 oxide particles, resulting in low total wear volume.

当具有高表面能的纳米颗粒被人工施加到摩擦表面上时，在表面上形成耐磨摩擦膜。先前的研究表明，高扩散速率的氧化物纳米颗粒，如Fe_2O_3，SnO_2，CuO或Bi_2O_3的供应，诱导过渡到轻度磨损与滑动距离。轻微磨损是由于摩擦钢表面上的磨损保护摩擦膜的形成，并且观察证实摩擦膜是由所提供的氧化物颗粒的摩擦烧结产生的。因此，即使在表面不存在颗粒的情况下，通过纳米颗粒的添加所产生的摩擦膜也有望降低磨损。本项目的目的是研究通过纳米颗粒的添加在钢表面所产生的摩擦膜的磨损行为。采用销盘式摩擦磨损试验机，在空气和真空（8 × 10 ~（-6）Pa）条件下制备摩擦膜，研究了颗粒种类和粒径对摩擦膜磨损性能的影响<-4>。销和盘试样材料是归一化的0.45质量%碳钢。在空气气氛下，添加的颗粒为CuO（平均粒径48 nm）、Fe_2O_3（30 nm）、SnO_2（21 nm）或Bi_2O_3（51 nm）氧化物，在真空气氛下，添加的颗粒为Cu（50 nm，1μm）。特别是氧化铋颗粒的加入使摩擦膜的轻度磨损转变滑动距离最长，从而使总磨损量最小。