摘要
以电解铜粉、还原铁粉、石墨等为主要原料,采用粉末冶金加压烧结工艺制备风电用铜基粉末冶金制动闸片,利用高温膨胀仪测定压坯在氢气气氛下的烧结动力学曲线,并表征烧结样品的显微组织与力学性能和摩擦磨损性能。结果表明:该制动闸片的最佳烧结温度为830℃;在此温度下烧结的制动闸片的布氏硬度为42.7 HBS,抗压强度达到222 MPa,抗弯强度为108 MPa;在MM-1000Ⅱ摩擦磨损试验机上进行20次动摩擦实验,摩擦因数稳定在0.3左右,磨损率仅为0.021 6 cm3/MJ,具有良好的制动性能,能够满足我国风力发电用制动闸片的使用性能要求。
The copper-based P/M brake pad for wind turbine was prepared by pressure sintering using electrolytic copper powder, reduced iron powder and graphite as main raw materials. The sintering kinetics curves were investigated and the microstructure was characterized. Moreover, the mechanical properties and friction and wear performance were tested. The results indicate that the optimum sintering temperature of the brake pad is 830 ℃, the Brinell Hardness, the compressive strength and the bending strength are 42.7 HBS, 222 MPa and 108 MPa, respectively. Twenty dynamic friction experiments were carried out on the MM-1000II-type friction and wear testing machine. The friction coefficient is stabilized around 0.3 and the wear rate is only 0.021 6 cm3/MJ. Excellent braking performance can satisfy the requirements of brake pad for wind turbine.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第1期66-70,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家高技术研究发展计划(863计划)资助项目(2013AA031104)
关键词
粉末冶金
制动闸片
烧结动力学
摩擦磨损
powder metallurgy
brake pad
sintering kinetics
friction and wear
