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Tribological properties of PM Cu-based dry friction clutch

机译：永磁铜基干摩擦离合器的摩擦学性能

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摘要

Sintered Cu-based frictional materials were developed by using powder metallurgy (PM) method. The materials are aimed for application in a passenger car as a dry friction clutch. Effects of sintering temperature and composition on mechanical and tribological properties were determined. It was found that improper frictional material formulations caused inferior properties, particularly when the sintering temperatures were increased. Admixing of high Sn content (8 wt. %) resulted in decreases of sintered density and hardness with increasing sintering temperature. High Sn contents caused swelling of the sintered materials. Tribological properties (friction coefficient and wear rate) of the sintered specimens of the investigated materials were insensitive to sintering temperatures in the range of 800-950 ℃ but they were strongly influenced by chemical compositions. Addition of 3 wt. % graphite lowered the friction coefficient, which subsequently lowered the wear rate of the sintered material. To increase friction coefficient, one of the crucial properties of the dry friction clutch, of the sintered Cu-based frictional materials, two approaches were employed. In the first approach, substitution of graphite by SiO_2 powders could improve the material friction coefficient. In the second approach, decreases of graphite content from 3 to 1 wt. % and of Sn content from 8 to 2 wt. % were conducted. The latter approach not only improved friction coefficient but also improved sintered density and hardness of the Cu-based frictional materials.
机译：烧结铜基摩擦材料是通过粉末冶金（PM）方法开发的。这些材料旨在用作干摩擦离合器的乘用车。确定了烧结温度和组成对机械和摩擦学性能的影响。已经发现，不合适的摩擦材料配方会导致性能变差，特别是当烧结温度升高时。随着烧结温度的升高，高锡含量（8 wt。％）的掺混导致烧结密度和硬度的降低。高的锡含量导致烧结材料膨胀。所研究材料的烧结试样的摩擦学性能（摩擦系数和磨损率）对800-950℃范围内的烧结温度不敏感，但受化学成分的强烈影响。添加3重量％。 ％的石墨降低了摩擦系数，随后降低了烧结材料的磨损率。为了增加摩擦系数，这是干式摩擦离合器，铜基摩擦材料的关键性能之一，采用了两种方法。在第一种方法中，用SiO_2粉末代替石墨可以提高材料的摩擦系数。在第二种方法中，石墨含量从3 wt％降低到1 wt％。 ％和8至2重量％的锡含量。 ％ 进行了。后一种方法不仅提高了摩擦系数，而且还提高了铜基摩擦材料的烧结密度和硬度。

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  • 会议地点 Bangkok(TH)
  • 作者

    Jirapat Prapai; Monnapas Morakotjinda; Thanyaporn Yotkaew; Bhanu Vetayanukul; Ruangdaj Tongsri; Panya Kamsuwan; Masahiko Yoshino;

  • 作者单位

    Automotive Engineering, International College, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;

    Powder Metallurgy Research and Development Unit (PM-RDU), Nation Metal and Materials Technology Center, National Science and Technology Development Agency, Pathum Thani, 12120 Thailand;

    Powder Metallurgy Research and Development Unit (PM-RDU), Nation Metal and Materials Technology Center, National Science and Technology Development Agency, Pathum Thani, 12120 Thailand;

    Powder Metallurgy Research and Development Unit (PM-RDU), Nation Metal and Materials Technology Center, National Science and Technology Development Agency, Pathum Thani, 12120 Thailand;

    Powder Metallurgy Research and Development Unit (PM-RDU), Nation Metal and Materials Technology Center, National Science and Technology Development Agency, Pathum Thani, 12120 Thailand;

    Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;

    Tokyo Institute of Technology, Tokyo, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Sintered dry friction clutch; friction coefficient; wear rate;

    机译：烧结干摩擦离合器；摩擦系数;磨损率;

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