摘要
采用粉芯丝材和高速电弧喷涂技术制备了Fe -Al金属间化合物涂层及Fe-Al/WC复合涂层 ,研究了从室温至 65 0℃不同试验温度下两种涂层的滑动磨损性能。结果表明 ,在高温下磨损面发生摩擦氧化反应形成大面积的氧化物保护层 ,降低了涂层的摩擦系数 ;剥层磨损是涂层的主要磨损机理。涂层中Fe3Al和FeAl金属间化合物相较高的高温强度和硬度 ,能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂 ,从而使Fe -Al涂层及Fe -Al/WC复合涂层表现出优异的高温耐磨性。添加WC硬质相后提高了复合涂层的平均硬度 ,从而提高了涂层的耐磨性 ;但高温下WC易发生氧化和分解 。
The iron aluminide based coatings (Fe-Al intermetallic coating and Fe-Al/WC composite coating) were produced by cored wire and high velocity arc spraying (HVAS). And the sliding wear properties from room temperature up to 650℃ of the two coatings have been investigated. The reasons of the friction coefficient decreasing at elevated temperatures are that protective oxide films formed on the worn surface during sliding wear process. And delamination is the predominant wear mechanism of the coatings. The Fe3Al and FeAl intermetallics which have higher strength and hardness at elevated temperatures can effectively resist crack initiation, propagation and splat fracture, thus resulting in excellent high temperature wear resistance of the composite coatings. The composite coatings show higher microhardness after adding WC hard phases, thus exhibit higher wear-resistance than that of Fe-Al coating from room temperature to 650℃. But the oxidation and decarburization of WC at elevated temperature will reduce the wear-resistance of the composite coatings.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2004年第9期828-831,共4页
China Mechanical Engineering
基金
国家自然科学基金资助重大项目 ( 5 0 2 3 5 0 3 0 )
国家自然科学基金资助项目 ( 5 0 0 0 5 0 2 4)
