摘要
磁浮列车中部分制动闸片在服役时一直处于受流状态,导致材料磨损加剧,影响闸片的服役寿命。为研究中低速磁悬浮列车制动闸片在受流工况下的摩擦磨损性能,以制动闸片使用的铜基粉末冶金材料和刹车盘使用的Q235B材料为摩擦副,研究不同制动速度下铜基粉末冶金/Q235B摩擦副的载流摩擦磨损行为。结果表明:无电流时随着滑动速度的增大,摩擦因数及磨损率整体呈现下降的趋势,载流时随着滑动速度的增大,摩擦因数整体呈现下降的趋势,而磨损率则整体呈现上升的趋势;无电流时磨损后的铜基粉末冶金材料表面覆盖着一层靛色的第三体层,该第三体层低速时主要以颗粒状为主,随着速度的增加逐渐被压实成连续致密状,高速时因黏着磨损加剧使得连续致密状第三体被破环,导致材料的摩擦因数和磨损率呈现反向增长的趋势;载流下磨损后的铜基粉末冶金材料表面出现了以机械磨损为主和以电弧烧蚀为主的2个区域,其中以机械磨损为主的区域依然是由靛色的第三体层组成,而以电弧烧蚀为主的区域表面则覆盖了一层金色熔融状物质,并且随着速度的增大,烧蚀区面积也逐渐增大。
Some brake pads of maglev train are always in the current-carrying state during service, resulting in increased material wear and affecting the service life of brake pads.In order to study the friction and wear properties of brake pad materials of medium and low speed maglev trains under current-carrying state, Copper-based powder metallurgy material for brake pads and Q235 B material for brake discs were used as friction pairs, the friction and wear behavior of copper-based powder metallurgy/Q235 B friction pair under different sliding speed was studied.The results show that when there is no current, the friction coefficient and wear rate show a downward trend as a whole with the increase of sliding speed.When there is current, the friction coefficient shows a downward trend as a whole with the increase of sliding speed, while the wear rate shows an upward trend as a whole.When there is no current, the worn surface of copper based powder metallurgy material is covered with an indigo-colored third body layer.The third layer is mainly granular at low speed, and is gradually compacted into a continuous dense shape with the increase of speed.At high speed, the continuous dense third body is broken due to the intensification of adhesive wear, resulting in the reverse growth of the friction coefficient and wear rate of the material.When there is current, there are two areas on the worn surface of Copper-based powder metallurgy material, which are mainly mechanical wear and arc ablation.The area dominated by mechanical wear is still composed of indigo-colored third body layer, while the area dominated by arc ablation is covered by a layer of gold molten material.With the increase of speed, the area of ablation zone is also gradually increasing.
作者
刘中华
刘政
杜慧杰
LIU Zhonghua;LIU Zheng;DU Huijie(R&D Center CRRC Tangshan Railway Vehicle Co.,Ltd.,Tangshan Hebei 064000,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第10期176-184,共9页
Lubrication Engineering
基金
国家自然科学基金项目(51305364)
国家重点研发计划项目(2016YFB1200601-B01)。
关键词
铜基粉末冶金
载流摩擦磨损性能
电弧烧蚀
制动闸片
copper-based powder metallurgy
current-carrying friction and wear behavior
arc ablation
brake pad
