提高MCrAlY涂层抗高温氧化性能方法的研究进展  

Research Progress on Improving the High-Temperature Oxidation Resistance of MCrAlY Coatings

作　　者：周圣丰[1] 刘佳[1] 熊征[2] 戴晓琴[3] 李玲华[1] 张泽忠[1] 顾梦豪 

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]海军工程大学理学院,武汉430033 [3]南昌航空大学信息工程学院,南昌330063

出　　处：《激光与光电子学进展》2015年第12期19-25,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(51261027);江西省自然科学基金(20132BAB206012);航空科学基金(2014ZE56013)

摘　　要：常规法制备的MCr Al Y涂层具有等轴晶形态、微气孔与裂纹等问题,其抗高温氧化性能有待提高。基于此,国内外研究者提出了许多提高MCr Al Y涂层抗高温氧化性能的方法。综述了这些方法,指出其存在的主要问题,并提出了激光-感应复合熔覆球磨诱导柱晶MCr Al Y涂层新方法,即将Ni Cr粉(或Ni Cr粉、Co粉)、Al粉与Y2O3粉在高能球磨机内进行机械合金化处理,获得由g-Ni/g′-Ni3Al组成、形貌呈多角状以及内部存在大量缺陷的球磨MCr Al Y粉末,然后感应预热高温合金基材的同时快速激光熔覆。该方法不仅获得了无裂纹的MCr Al Y涂层,而且诱使MCr Al Y涂层呈柱状晶生长,使其抗高温氧化性能大大提高。MCr Al Y coatings prepared by conventional methods have polycrystalline structure, micropores and cracks.The high-temperature oxidation resistance of MCr Al Y coatings needs to be improved. Many measurements have been put forward by domestic and foreign researchers to improve their high-temperature oxidation resistance. These methods are reviewed and the related problems are also analyzed. Moreover, the method on cryomilling inducing the columnar growth of MCr Al Y coatings by laser-induction hybrid cladding（LIHRC） is put forward. Ni Cr powder（or Ni Cr powder, Co powder）, Al powder and Y2O3 powder are treated by mechanical alloying in high-energy milling apparatus to obtain the cladding powder consisting of g-Ni/g′-Ni3 Al with large amounts of internal defects. The cryomilled MCr Al Y powder presents the polygonal morphology. Preheating the substrate by induction heater is combined with laser cladding simultaneously. This method can not only obtain the crack-free MCr Al Y coatings, but also induce the columnar growth in MCr Al Y coatings. The high-temperature oxidation resistance of MCr Al Y coating is improved significantly.

关 键 词：材料 MCRALY涂层 氧化机理 抗高温氧化 

分 类 号：TG115[金属学及工艺—物理冶金]