超音速火焰喷涂WC-10Co-4Cr和CoCrW涂层的微动磨损特性研究

 徐涛,祁学潮,张六泉

(西南交通大学 机械工程学院 摩擦学研究所,四川 成都 610031)
摘要:为提高Inconel690合金管的耐磨性,在Inconel690合金管外表面,采用超音速火焰喷涂技术(HVOF)制备WC-10Co-4Cr和CoCrW两种涂层,管状试样与1Cr13圆柱体配副件以“十”字交叉接触方式,位移幅值为100~200 μm;法向载荷为30~90 N;频率为2 Hz;循环次数为3×104次;环境温度为室温,在PLINT微动磨损试验机上进行微动磨损试验。试验结果表明:载荷一定时,涂层的摩擦系数随着位移的增加而变大。两种涂层的耐磨性均显著优于Inconel690合金;WC-10Co-4Cr涂层的耐磨性略优于CoCrW涂层。清洗后的磨痕表面存在剥落坑和剥层现象,两种涂层的磨损机制主要是剥层和磨粒磨损为主。
关键词:WC-10Co-4Cr涂层;CoCrW涂层;超音速火焰喷涂;微动磨损
中图分类号:TL214+.6 文献标志码:A doi:10.3969/j.issn.1006-0316.2016.09.009
文章编号:1006-0316 (2016) 09-0039-06
Fretting Wear Behavior of HVOF Sprayed WC-10Co-4Cr and CoCrW Coatings
XU Tao,QI Xuechao,ZHANG Liuquan
( Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China )
Abstract:In order to improve the wear of Inconel690 alloy, High Velocity Oxy-Fuel (HVOF) spraying technique was used to achieve the WC-10Co-4Cr and CoCrW coatings on the surface of Inconel690 alloy tube. The fretting wear behavior of the coatings tube in contact with crossed 1Cr13 cylindrical sample has been investigated on the PLINT fretting wear tester. Different experimental conditions have been taken into consideration, (i.e. tangential displacement amplitudes range from 100 μm to 200 μm, normal loads range from 30 N to 90 N, fretting frequency at 2 Hz, cycles at 3×104, environmental temperature at 25 ℃). The experimental results show that when the normal load unchanged, with the displacement amplitude increasing, the friction coefficient of the coatings become large. The two coatings wear resistance is significantly better than Inconel690 alloy. And WC-10Co-4Cr coating slightly better than CoCrW. After cleaning, a lot of flaking pits and delamination are showed up on the worn surface according to surface morphological analysis. The main wear damage mechanism of coatings is abrasive wear and delamination.
Key words:WC-10Co-4Cr coating;CoCrW coating;HVOF;fretting wear 
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收稿日期:2016-04-21
作者简介:徐涛(1989-),男,湖北荆州人,硕士研究生,主要研究方向为微动磨损;祁学潮(1989-),男,甘肃兰州人,硕士研究生,主要研究方向为微动腐蚀。
 

 

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