镍包覆处理对氧化物弥散强化镍基高温合金组织与性能的影响  

Effect of Nickel Plating Process on Microstructure and Property of Oxide Dispersion Strengthened Nikel-Based High Temperature Alloy

作　　者：李小峰[1] 熊惟皓[1] 李俊[1] 孔涛[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》2012年第9期34-37,68,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金重点资助项目(50634060)

摘　　要：通过表面改性及化学镀镍技术制备出镍包覆Y_2O_3粉,并以不同质量分数(0%～10%)添加到镍基高温合金粉中,采用机械合金化和真空烧结工艺制备出氮化物弥散强化(ODS)镍基高温合金,研究了镍包覆及纳米Y_2O_3添加量对合金组织、相对密度和抗拉强度的影响。结果表明:镍包覆处理降低了片状、网状黑色相Y_2O_3的偏聚,使纳米Y_2O_3粉的最佳添加量(质量分数)、相对密度、抗拉强度由包覆前的1.5%,95.32%,639 MPa增加到了5%,97.45%,725 MPa。Nickel plated Y2O3powders were prepared by surface modifying and chemical nickel plating technology, and was added into nickel-based high temperature alloy powders to prepare oxide dispersion strengthened （ODS） nickel-based high temperature alloy by mechanical alloying and vacuum sintering process, and the effects nickel plating and Y2O3 phase content on microstructure, relative density and tensile strength of the alloy were studied. The results show that nickel plating process improved the segregation of black Y2O3 phase with flake and net-work, and increased the optimal adding amount ofY2O3 powders, relative density and tensile strength from 1.5wt%, 95.32%, 639 MPa, before nickel plating, to 5wt%, 97.45%,725 MPa.

关 键 词：ODS镍基高温合金 镍包覆 抗拉强度 相对密度 

分 类 号：TF125.5[冶金工程—粉末冶金]