机械合金化制备Al-Al_2O_3-ZrO_2-Y_2O_3复合涂层及其性能研究  

Preparation of Al-Al_2O_3-ZrO_2-Y_2O_3 Composite Coating by Mechanical Alloying and its Properties

作　　者：郭燕[1] 沈以赴[1] 李博[1] 丁润东[1] 胡永志[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《稀有金属与硬质合金》2012年第3期18-22,共5页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金资助项目(51075205)

摘　　要：通过机械合金化在室温下于304不锈钢表面成功制得Al-Al2O3-ZrO2-Y2O3复合涂层。通过相关实验分析了复合涂层的组织形貌、显微硬度及高温氧化性能。结果表明:随着球磨时间的增加,涂层厚度先增加后减小;当球磨时间为8h时,涂层最为致密,平均厚度约为200μm;当球磨时间为14h时,涂层部分剥落,涂层厚度减小。涂层的显微硬度明显高于基体,且从表层到基体呈梯度下降,最高显微硬度值达HV0.1525,为基体硬度的2倍多。Al-Al2O3-ZrO2-Y2O3复合涂层的抗高温氧化性能良好。Al-Al2O3-ZrO2-Y2O3composite coating was prepared successfully on the surface of 304 stainless steel by mechanical alloying at room temperature. The structure and morphology, micro-hardness and high-temperature oxidation resistance of the coating were investigated by related experiments. The results show that with milling time increasing, the thickness of the coating increases at first and then decreases. The coating prepared by milling for 8 h is the densest with average thickness of 200/~m. When the milling time is prolonged to 14 h, part of the coating is peeled off and its thickness decreases. The micro-hardness of the coating is significantly higher than that of the substrate, and declines gradually from the top surface to the inner substrate. The maximum micro-hardness of the coating is up to HV0.1 525, more than 2 times the hardness of the substrate. Furthermore, the high-temperature oxidation resistance ofAl-Al2O3-ZrO2-Y2O3 composite coating is high.

关 键 词：机械合金化 高能球磨 Al-Al2O3-ZrO2-Y2O3 复合涂层 显微硬度 高温氧化 

分 类 号：TG174.445[金属学及工艺—金属表面处理]