摘要
为了在降低摩擦材料成本的同时,保证摩擦材料性能良好,在原有配方基础上尝试改变铁粉粒度和种类,即把80~300目的泡沫铁粉替换成粒度大小为20~120目的泡沫铁粉或325目的还原铁粉,采用相同的热压成型技术和热处理工艺制备摩擦材料试样。采用洛氏硬度计测试试样的硬度,采用定速式摩擦试验机测试试样的摩擦磨损性能,采用扫描电镜观察试样的磨损面形貌,研究其磨损机制。结果表明:当采用较大的泡沫铁粉粒度时,随着其含量的增加,平均摩擦因数和磨损率会提高,但摩擦因数稳定性提高;还原铁粉具有明显的增摩作用和热衰退现象,尤其在恢复过程,摩擦因数变化大且不稳定,但磨损率低。20~120目泡沫铁粉可提高材料的摩擦因数稳定性,且可相对减轻材料的磨粒磨损和疲劳磨损,因而可用于代替80~300目泡沫铁粉。
In order to reduce the cost of friction materials,and at the same time to ensure the good performance of friction materials,based on the original formula of the friction materials,the foam iron powder of the size from 80 mesh to 300 mesh was replaced by the foam iron powder of the size from 20 mesh to 120 mesh or by reduced iron powder of the size of325 mesh,and the samples of friction material were prepared with the same hot-pressing technique and heat treatment process. The hardness of the samples was measured by using the Rockwell hardness tester,the friction and wear properties were tested using a constant velocity friction tester,the wear surface morphology was observed with scanning electron microscopy,and the wear mechanism was analyzed. The results show that when the particle size of foam iron becomes larger,the average friction coefficient and wear rate are increased with the increase of its content,but the stability of friction coefficient is improved. The reduced iron powder has obvious effect of increasing friction and heat fading phenomenon,especially in the recovery process,the friction coefficient has large change and is unstable,but the wear rate is low. The foam iron powder from 20 mesh to 120 mesh can improve the the stability of friction coefficient and reduce the abrasive wear and fatigue wear of friction material,which can be used to replace the foam iron powder from 80 mesh to 300 mesh.
作者
钟厉
李永建
ZHONG Li;LI Yongjian(School of Mechatronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,Chin)
出处
《润滑与密封》
CAS
CSCD
北大核心
2018年第5期87-91,共5页
Lubrication Engineering
基金
重庆市基础与前沿研究计划项目(cstc2015jcyj BX0140)
