镍包覆Y_2O_3颗粒弥散强化镍基高温合金的抗热腐蚀性能  

Hot Corrosion Resistance of Ni Coated Y_2O_3 Powders Dispersion Strengthened Nickel-Based Superalloy

作　　者：孔涛[1] 熊惟皓[1] 张志力[1] 李小峰[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《机械工程材料》2013年第11期43-48,54,共7页Materials For Mechanical Engineering

基　　金：高等学校博士点专项科研基金资助项目(20080480032);国家自然科学基金重点资助项目(50634060)

摘　　要：为改善Hastelloy X合金的抗热腐蚀性能,通过化学镀镍法制备了镍包覆Y2O3颗粒,并以之为弥散强化相,以Hastelloy X合金为基体相,制备了质量分数为5%的镍包覆Y2O3颗粒弥散强化高温合金,然后在其表面涂覆由75%Na2SO4和25%NaCl组成的混合盐溶液,在850℃下进行热腐蚀试验,并将其与基体合金、普通Y2O3增强合金进行对比。结果表明:镍包覆Y2O3颗粒能更加均匀地弥散于基体中,均匀弥散的Y2O3颗粒可为Cr2O3提供形核位置,促进保护性氧化膜Cr2O3的形成;同时镍包覆Y2O3颗粒还能提高氧化膜的附着力,阻碍氧化膜剥落,改善基体合金的抗热腐蚀性能。In order to improve hot corrosion resistance of Hastelloy X alloy, the Ni coated Y2O3 powders were prepared by electroless nickel plating method, and then taking them as dispersion phase and Hastelloy X particles as suhstrate to prepare a dispersion strengthened nickel-based superalloy. A salt solution, including 75wt% Na2SO4 and 25wt% NaC1, were coated on the alloy and following hot corrosion test at 850℃ The hot corrosion resistance of the alloy, substrate alloy and ordinary Y203 strengthened alloy were compared. The result show that nickel plating could make Y2O3 particles uniform dispersion in the substrate, dispersed Y2O3 particles acted as heterogeneous nucleation sites for CrzO3, boosting the formation of a protective Cr2O3 oxide scale. At the same time, Ni coated Y2O3 particles could promote the adhesive force of oxide scale, impede the spallation of oxide scale, and enhanced hot corrosion resistance of substrate alloy.

关 键 词：镍包覆Y2O3颗粒 弥散强化 热腐蚀 

分 类 号：TG146.1[一般工业技术—材料科学与工程]