(1. 江蘇科技大學 江蘇省先進焊接技術重點實驗室，鎮(zhèn)江 212003；
2. Korea Institute of Machinery and Materials，Changwon 641—010，Korea)
摘 要: 以Al2O3陶瓷球為對偶材料，借助UMT-2摩擦磨損試驗機詳細研究溫度變化對復合材料干滑動摩擦磨損特性的影響，并用SEM、EDS、奧林巴斯激光共焦掃描顯微鏡分析鑄態(tài)SiCp/A356復合材料的高溫摩擦磨損行為。結果表明：復合材料的磨損率對溫度變化很敏感，在200 ℃以下，磨損率及其變化較小，以氧化磨損機制為主，屬于輕微磨損；當溫度達到250 ℃及以上時，磨損率開始急劇上升，磨損表面出現(xiàn)嚴重塑性流動痕跡，磨損面上出現(xiàn)磨屑粘著堆積的凸起，同時形成大量的大尺寸的磨屑，此時以粘著磨損機制為主，同時存在少量的氧化磨損。氧化磨損階段，摩擦因數雖有變化，但相對穩(wěn)定；但粘著磨損階段，摩擦因數變得極度不穩(wěn)定，出現(xiàn)尖銳的峰值。
關鍵字: SiCp/A356復合材料；制動盤；滑動摩擦；磨損
（1. Provincial Key Laboratory of Advanced Welding Technology,
Jiangsu University of Science and Technology, Zhenjiang, 212003, China；
2. Korea Institute of Machinery and Materials，Changwon 641-010, Korea）
Abstract:The influence of temperature change on the dry sliding friction and wear characteristics of as-cast SiCp/A356 composite was investigated on UMT-2 tribometer by using Al2O3 ceramic ball as dual material. The high temperature friction and wear behavior of the composite material were analyzed by SEM, EDS and Olympus confocal laser scanning microscope. The results show that the wear rate of the composites is very sensitive to the change of temperature. When temperature is less than 200 ℃, the wear rate and its change are relatively smaller. The wear mechanism is mainly oxidation wear, which is one form of mild wear. When the temperature reaches or is above 250 ℃, the wear rate increases quickly. And on the wear surface, there are severe plastic flowing wear traces, the bulge of stacked swarf adhesion and a large number of large sized wear debris. The wear mechanism mainly is adhesive wear and there is a small amount of oxidation wear as well. At oxidation wear stage, although the friction coefficient changes, but it is relatively stable. While at adhesion wear stage, the friction coefficient becomes extremely unstable, and a sharp peak appears.
Key words: SiCp/A356 composite; brake disc; sliding friction; wear
