无压浸渍锰白铜合金-W_2C复合涂层的磨损特性研究  

Wear Behavior of Cu-20Ni-20Mn Alloy-W_2C Composite Coatings Prepared by Pressureless Infiltration

作　　者：马红玉[1] 王镇全[1] 张嗣伟[1] 王德国[1] 

机构地区：[1]中国石油大学(北京)机电工程学院,北京102200

出　　处：《摩擦学学报》2007年第4期387-392,共6页Tribology

基　　金：高等学校博士学科点专项科研基金资助项目(20020425005)

摘　　要：采用无压浸渍工艺在45#钢表面制备锰白铜合金-W2C复合涂层,考察了比压、转速及W2C颗粒尺寸对复合涂层耐磨性的影响,并与目前钻机刹车盘用16Mn钢材料的耐磨性进行对比.结果表明：在给定的试验条件下,采用2种不同W2C颗粒粒度的复合涂层的磨损量均随比压及转速的增加而增大;W2C粒度大的涂层由于W2C颗粒在锰白铜基体中分布均匀,形成较好的骨架结构,弥散强化作用较好,比W2C粒度小的涂层具有更优异的耐磨性;由于W2C颗粒能够削弱磨粒的微切削作用,抑制裂纹扩展,其涂层耐磨性比16Mn钢提高10～50倍.Two types of Cu-20Ni-20Mn Alloy-W2C composite coatings with different particle size of W2C were prepared on a substrate of steel 45 using pressureless infiltration technique. Effect of contact pressure, rotating speed and particle size of WE C on the wear of the coatings sliding against a new type of brake-block materials for drilling rigs＇ disc brake were investigated respectively using a Falex friction and wear test machine. The wear of 16Mn steel was studied for comparison with that of the coatings. It is found that wear mass loss of the coatings increased when the contact pressure increased from 0.18 to 0.54 MPa, as well as when the rotating speed increased from 500 to 1 500 r/min. The coating with larger W2C particles had better wear resistance than that with smaller W2C particles, which might attribute to more uniform distribution of larger W2 C particles in Cu based alloy which leading to a better framework and strengthening effect. The wear resistance of the coatings was 10 to 50 times better than that of 16Mn steel, because the hard W2C particles in the coatings weakened the micro-cutting action of abrasives and restrained the growth and spread of cracks in the coatings.

关 键 词：锰白铜合金 W2C粒度 无压浸渍 磨损特性 

分 类 号：TG174.442[金属学及工艺—金属表面处理]