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Study on Wear of a Ceramics/Metal Composite

陶瓷/金属复合材料的磨损研究

基本信息

批准号：
03650121
负责人：
KATO Takahisa
金额：
$ 1.34万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650121/
关键词：
Composite Wear Friction Frictional Heating Elastic Deformation セラミクス

项目摘要

In order to understand characteristics of friction and wear of composites, a composite slider consisting of ceramics (MnNiO ceramics) and metal (CoNbZr amorphous metal) is tested against a rotating disk made of zirconia. The results show that gross wear rate of composites is governed by the inverse rule to some extent. The inverse rule is useful for material design since it is possible to predict gross wear volume of composites by using the this rule.On the other hand, when a composite material is worn out, an uneven worn surface with a level difference is generally formed between constituents. It is necessary to clarify the mechanism of formation of the uneven surface in order to understand the mechanism of wear of composites. We carry out wear tests of composites with respect to the uneven surface, and then take applied load and sliding velocity as parameters of test conditions. It is observed that the shape and the level difference between ceramics surface and metal surface strongly depend on the sliding conditions. The notable features are as follows: (1) With the increase of pressure, the level difference between constituents becomes large. (2) In case of large pressure and high sliding velocity, a shape like a hawk nose appears at the leading edge of ceramics surface and a relatively deep groove at the leading edge of metal surface. In this study, the mechanism of formation of the uneven surfaces is also investigated theoretically by using the theories of elastisity and heat conduction. It is obtained from the numerical analysis that elastic deformation of constituents and local reduction in strength due to frictional heating play important roles in forming uneven worn surfaces of composites.

为了了解复合材料的摩擦磨损特性，由陶瓷（MnNiO陶瓷）和金属（CoNbZr非晶金属）组成的复合材料滑块对氧化锆制成的旋转盘进行了测试。结果表明，复合材料的总磨损率在一定程度上服从逆规律。相反，当复合材料发生磨损时，通常会在各组分之间形成具有台阶差的不均匀磨损表面。为了更好地理解复合材料的磨损机理，有必要阐明表面不平整的形成机理。以载荷和滑动速度为试验条件参数，对复合材料在非平整表面上进行了磨损试验。结果表明，陶瓷表面和金属表面的形状和水平差强烈依赖于滑动条件。其显著特点是：（1）随着压力的增加，组分之间的位差变大。(2)在大压力和高滑动速度下，陶瓷表面前缘出现类似鹰钩鼻的形状，金属表面前缘出现较深的沟槽。在本研究中，不平坦表面的形成机制也从理论上探讨了使用弹性理论和热传导理论。数值分析表明，摩擦热引起的材料弹性变形和局部强度降低是复合材料非均匀磨损表面形成的主要原因。