(1. 蘭州理工大學 甘肅省有色金屬新材料省部共建國家重點實驗室，蘭州 730050；
2. 蘭州交通大學 化學與生物工程學院，蘭州 730070)
摘 要: 采用超音速等離子噴涂技術在45#鋼基體上制備高鋁銅合金粗粉涂層，對涂層進行邊界潤滑摩擦實驗，分析涂層的摩擦磨損特征及表面元素的質量損失。結果發(fā)現：涂層的摩擦因數隨外加載荷的增加呈逐漸下降趨勢；盡管磨損量隨載荷的增大逐漸增加，但磨損率呈下降趨勢，表明隨外加載荷的增加涂層耐磨性能逐漸增強。涂層在中低載荷下以磨粒磨損為主，當載荷達到高載荷540 N時，涂層由磨粒磨損向疲勞磨損轉變，并在犁溝邊緣發(fā)生疲勞磨損的同時表現出輕度的粘著磨損。邊界潤滑條件下，涂層元素的質量磨損主要表現為Cu元素的損失，磨粒磨損留下的犁溝為O元素進入摩擦界面提供通道，使涂層表面形成微氧化膜。
關鍵字: 高鋁銅合金；粉體涂層；超音速等離子；摩擦；磨損
（1. State Key Laboratory of Gansu Advanced Nonferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China;
2. School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China）
Abstract:The high-aluminium copper alloy coarse powders coating was fabricated on 45# steel substrate by supersonic plasma spraying. The friction experiment was carried out in the boundary lubrication conditions, and then, the frictional and wear characteristics and the surface elements mass loss of the coating were analyzed. The results show that the friction coefficient of the coating has a gradual decline trend with the increase of the loads, although the wear loss gradually increases with the increase of the loads, the wear rate shows the downward trend, indicating that the wear-resisting performance of the coating is gradually strengthened with the increase of loads. The main wear mechanism of the coating is abrasive wear in the conditions of the low and middle loads, and then the mechanism transforms to fatigue wear when the load reaches 540 N. At the same time, fatigue wear of the coating not only happens in furrows edge, but also mild adhesion appears. In the boundary lubrication conditions, the wear mass loss of the coating elements mainly shows the loss of Cu element, and the furrows left by abrasive wear provide the channels for O element into friction interface, bringing about the tiny oxidation film on surface of the coating.
Key words: high-aluminium copper alloy; powder coating; supersonic plasma; friction; wear
