激光与光电子学进展, 2015, 52 (12): 120004, 网络出版: 2015-12-08
提高MCrAlY 涂层抗高温氧化性能方法的研究进展 下载: 567次
Research Progress on Improving the High-Temperature Oxidation Resistance of MCrAlY Coatings
材料 MCrAlY 涂层 氧化机理 抗高温氧化 materials MCrAlY coatings oxidation mechanism high-temperature oxidation resistance
摘要
常规法制备的MCrAlY 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MCrAlY 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MCrAlY 涂层新方法,即将NiCr 粉(或NiCr 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γ-Ni/γ′-Ni3Al 组成、形貌呈多角状以及内部存在大量缺陷的球磨MCrAlY 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MCrAlY 涂层,而且诱使MCrAlY涂层呈柱状晶生长,使其抗高温氧化性能大大提高。
Abstract
MCrAlY coatings prepared by conventional methods have polycrystalline structure, micropores and cracks. The high-temperature oxidation resistance of MCrAlY 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 MCrAlY coatings by laser-induction hybrid cladding (LIHRC) is put forward. NiCr powder (or NiCr 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 γ-Ni/γ′-Ni3Al with large amounts of internal defects. The cryomilled MCrAlY 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 MCrAlY coatings, but also induce the columnar growth in MCrAlY coatings. The high-temperature oxidation resistance of MCrAlY coating is improved significantly.
周圣丰, 刘佳, 熊征, 戴晓琴, 李玲华, 张泽忠, 顾梦豪. 提高MCrAlY 涂层抗高温氧化性能方法的研究进展[J]. 激光与光电子学进展, 2015, 52(12): 120004. Zhou Shengfeng, Liu Jia, Xiong Zheng, Dai Xiaoqin, Li Linghua, Zhang Zezhong, Gu Menghao. Research Progress on Improving the High-Temperature Oxidation Resistance of MCrAlY Coatings[J]. Laser & Optoelectronics Progress, 2015, 52(12): 120004.