(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 采用超音速火焰噴涂工藝在16Mn鋼上制備了WC-12Co涂層，并測(cè)試了該涂層的力學(xué)性能特別是其抗磨粒磨損性能。結(jié)果表明：WC-12Co涂層的主相為碳化鎢，顯微硬度為(1341.0±134.3)HV，孔隙率為0.21%±0.04%。該涂層的磨損率隨著磨粒硬度、磨粒粒度和加載載荷的增加而增加。當(dāng)磨粒的硬度低于涂層硬度時(shí)，涂層的磨損機(jī)制以磨耗磨損為主，磨損率低；當(dāng)磨粒的硬度超過涂層的硬度時(shí)，涂層的磨損以微切削為主，磨損率高。另外，WC-12Co涂層的耐磨性相對(duì)于16Mn鋼也是隨著磨粒的硬度變化而變化。
關(guān)鍵字: WC-Co涂層；超音速火焰；磨粒磨損
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:WC-12Co coating was deposited on the 16Mn steel by high velocity oxygen flame (HVOF) process. The mechanical performances, especially, the abrasive wear behavior, of WC-12Co coating were investigated. The results show that the hardness and porosity of the coating are (1341.0±134.3) HV and 0.21%±0.04%, respectively. The wear rate of the WC-12Co coating increases with increasing the hardness, the size and the employed loadings of the abrasives. The abrasive wear mechanism of the WC-12Co coating is mainly abrasion wear and the wear rate is low when the hardness of the abrasive is lower than that of the coating. However, the wear mechanism of the WC-12Co coating is mainly micro-cutting and the wear rate is very high when the hardness of the abrasive is higher than that of the coating. In addition, compared to the 16Mn steel, the relative abrasive wear resistance of the WC-12Co varies with the change of hardness of the abrasives.
Key words: WC-Co coating; high velocity oxygen flame; abrasive wear
