一种高性能烧结摩擦材料摩擦剂的选择
来源期刊：中南大学学报(自然科学版)2001年第4期
论文作者：樊毅 张金生 刘伯威 吴芳
文章页码：386 - 389
关键词：摩擦材料;金属基;摩擦剂;碳化硼
Key words：friction material; metal matrix; friction modifier; boron carbide
摘 要：合理选择摩擦组元对改善高性能金属基烧结摩擦材料的性能至关重要.采用粉末冶金工艺制备了以SiO2,SiC,B4C等为摩擦剂的金属基烧结摩擦材料,研究了该摩擦组元对材料的机械性能特别是摩擦磨损性能的影响,探讨了其作用机理.研究结果表明:同时添加SiO2,SiC,B4C作摩擦剂的材料比单独添加SiO2,SiC或SiO2+SiC的材料综合性能优异得多.这是由于除了SiO2,SiC作为摩擦组元具有一些优良性能外,B4C与铁在烧结温度下反应生成了一种高硬度的金属间化合物Fe2B,其综合作用结果使该材料的摩擦因数比其他3种材料高出30%~40%,摩擦因数稳定度高出20%~60%,且磨损小,是一种理想的、可广泛应用于各种高能重载工况下工作的高性能摩擦材料.
Abstract: It is very important to select friction components for metal-base sintering friction materials. Friction materials which contain SiO2, SiC and B4C have been fabricated by powder metallurgy technology. The effects of SiO2, SiC and B4C on mechanical properties, especially friction and wear characteristics have been studied. The results show that using SiO2, SiC and B4C together as friction modifiers of material is much better than using SiO2, SiC respectivelyor SiO2, SiC together. The reason is that reaction between B4C and Fe takes place during sintering. A new product Fe2B appears in matrix of the material. The material which contains this intermetallics together with SiO2, SiC as friction modifiers has excellent properties: its friction coefficient reaches 0.33~0.37, and its stability of friction coefficient reaches about 0.85. The wear rate of both material itself and matching material is low. Therefore, this kind of metal-base sintering friction material can be satisfactory for the use of brake under high and heavy load conditions.
