一种新型半金属刹车片材料的研究.pdf

兔兔ww. xli ILI.ceon
第27卷第1期
粉末治金技术
2009年2月
Powder Metallurgy Technology
Feb.2009
应用
种新型半金属刹车片材料的研究
尹国洪董元源
(江阴职业技术学院机电工程系,江苏江阴2143)
摘要:研究了加有菜武氏相强化的铁基抗磨合金细粉末、纳米级丁腈橡胶粉、纳米级A20和BN、促进剂
DPTT和DMTD等组分的无石棉刹车片材料,试样通过了XD-MSM机定速试验和 Chase机试验。结果表
明:定速试验的磨损率较低,摩擦稳度在0.84以上; Chase试验表明,300℃的高温摩擦系数达0.428
0.497,热衰退很小,其摩擦稳度a更强,多数在0,92以上,甚至于达到0.998;用此材料制成的产品试运行情
况良好。文章分析了添加的合金粉末和纳米级丁腈橡胶粉的作用机理,指出了合金菜武氏相金属互化物的原
子键合和特殊的晶体结构对高的高温摩擦系数和稳度aα、低的热衰退和粘着磨损所起的关键作用;纳米级丁
腈橡胶粉韧化基体,与其它添加剂优化组合,对减少磨损、提高稳度as、防止噪音起重要作用。
关键词:摩擦学特性;菜武氏相强化铁基抗蘑合金;多组分复合材料
Investigation of a new type simi-metallic brake material
Yin Guohong, Dong Yuanyuan
Department of Mechanic &Electronic Engineering, Jangyin Polytechnic College, Jiangyin Jiangsu, 214433, China)
Abstract: A new type of brake material added Fe base wear resistant alloy powder strengthened by Laves phase
rubber-carboxylic nirile-butadicne nanopowder, A and B nanopowder, accelerator DPTT, DMTD etc without
asbestos has been investigated. Specimens were tested by constant speed XD-MSM machine and Chase machine
The results show that the new material has higher friction coefficient at high temperature, very low thermo-decline
less abrasion, especially excellent friction stability a. The pad brake of new material has run well. The active
mechanism of Laves phase and rubber-carboxylie nitrile-butadiene nanopowolet have been analysed. It indicates that
the special bond and crystalline structure of the alloys contribute to friction stabilityast, higher hardness, low
abrasion, low adhesive wear and that the nano-scale rubber possesses ability to cooperate with orther additives to
toughen the base of composite, to improve wear rate, noise and a s
Key words: tribological characteristics, Fe base wear resistant alloys strengthened by Laves phase, composite with
multi-components
刹车片广泛应用于机动车辆,是依靠摩擦作用的材料配方、改善摩擦材料的性能是刹车片的研究
来实现制动功能的部件,关系到机动车辆能否安全重点和方向。笔者研究了采用高温摩擦系数大、高
可靠地行驶。摩擦材料是刹车片上的关键性材料,温耐磨性好的菜武氏相( Laves)强化铁基合金粉末
其性能好坏直接影响制动装置的制动效果。理想的作为填充剂,以多组分强化纤维代替石棉,使用多组
摩擦材料应有良好的热稳定性,使刹车片在高温下分粘结剂,以及多组分改性填充剂等原料,优化配
摩擦系数变化小,热磨损小,提高工作可靠性,延长制,以便获得性能优异的刹车片用摩擦材料。
使用寿命;有较小的制动噪音,改善车辆舒适性,减
小对环境的噪音污染;另外,还应有良好的机械强1试验
度、对偶面磨损较小、环保效果好。因此,研制新型
原料配制
米尹国洪(1960-),男,副教授,高级工程师。E- mail: jyygh(@ sohu,com
收稿日期:2007-12-25