NiCoCrAlYSi涂层对镍基单晶合金高温氧化特性的影响  

Influences of NiCoCrAlYSi Coating on High Temperature Oxidation Characteristic of Single Crystal Nickel-Base Superalloy

作　　者：杜洪强[1] 田素贵[1] 于兴福[1] 卢旭东[1] 王启民[2] 

机构地区：[1]沈阳工业大学,辽宁沈阳110023 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2008年第9期1555-1559,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50571070)

摘　　要：通过对有/无NiCoCrAlYSi涂层镍基单晶合金高温氧化后的组织结构观察与分析、及等温循环氧化质量变化动力学曲线测定,研究了有/无涂层合金的高温氧化特性。结果表明:在高温氧化期间,无涂层合金表层发生明显的氧化和内氧化,在异形大颗粒内氧化物附近出现贫Al区,使区内γ′相消失;元素贫化区尺寸随时间的变化服从抛物线规律;无涂层合金经不同温度循环氧化具有不同的动力学特征,1040℃循环氧化表现的较大增减重波动幅度的原因是元素Al和Cr的交替选择性氧化;涂层合金经不同温度循环氧化后无明显失重特征,该涂层可有效改善合金的抗氧化性能。By mean of observation of the microstructure of oxide layer for oxidized NiCoCrAIYSi coating and measurement of the isothermal cyclic oxidation mass-change curves, the high temperature oxidation characteristic with and without coating for single crystal nickel-base superalloy has been investigated. The results show that the fact of an obvious oxidation and internal oxidation occurs in the superalloy without coating during oxidation at high temperature, and the poor-aluminum areas appear near the bulk abnormity internal oxides, which leads to the γ＇ phase disappear. The relation between the poor-aluminum areas size and time obeys the parabola regularity. The alloy without coating displays the different dynamics characteristic during cyclic oxidation at different temperatures. A great mass fluctuation during cyclic oxidation at 1040 ℃ for the alloy without coating is due to the alternate selected oxidation of the element AI and Cr. No obvious lost weight was detected in the coating alloy during cyclic oxidation at different temperatures, which proves that NiCoCrAIYSi coating can effectively improve the properties of the oxidation resistance of the superalloy.

关 键 词：镍基单晶合金 NiCoCrAlYSi涂层 高温氧化 循环氧化 

分 类 号：TG132.32[一般工业技术—材料科学与工程]