溅射CoNiCrAlTaY涂层对镍基合金高温氧化行为的影响  

Influence of Sputtered CoNiCrAlTaY Coating on Oxidation Behavior of Ni-Based Superalloy

作　　者：卢旭东[1] 杨诚 郭策安[1] LU Xu-dong;YANG Cheng;GUO Ce-an(School of Equipment Engineering,Shenyang Ligong University,Shenyang 110159,Liaoning,China)

机构地区：[1]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《铸造》2021年第10期1204-1210,共7页Foundry

基　　金：辽宁省高等学校基本科研项目(LG201704);2019年航天一院高校联合创新基金(CALT基金);2021年辽宁省普通本科高等学校校际合作项目(协同创新)。

摘　　要：采用磁控溅射方法在镍基高温合金表面沉积晶粒平均尺寸小于100 nm的CoNiCrAlTaY涂层,通过对镍基高温合金在900℃和CoNiCrAlTaY涂层在1000℃进行氧化动力学曲线测定及组织结构观察,研究了CoNiCrAlTaY涂层对镍基高温合金高温氧化行为的影响。结果表明,在900℃高温氧化期间合金发生外氧化和内氧化,氧化期间合金氧化和氧化物膜剥落交替进行,动力学曲线呈波浪式变化;外层氧化产物主要为TiO_(2)、Cr_(2)O_(3),中间层氧化产物主要为A1_(2)0_(3)、SiO_(2),内层氧化产物主要为A1_(2)0_(3)。镍基合金经溅射CoNiCrAlTaY涂层后在1000℃氧化期间,涂层可有效改善镍基高温合金的抗氧化性能,涂层的氧化动力学曲线仅在氧化初期有轻微增重而后趋于平稳,遵循抛物线规律,涂层表面快速形成连续A1_(2)0_(3)保护性膜,且氧化期间A1_(2)0_(3)薄膜未发生明显剥落,仅在涂层内生成A1_(2)0_(3)内氧化物。CoNiCrAlTaY nanocrystalline coatings with mean grain size less than 100 nm were deposited on Ni-base superalloy substrate by magnetro sputtering.By means of microstructure observation and measurement of the isothermal oxidation mass change curves,the high temperature oxidation characteristic of Ni-base superalloy at 900℃and CoNiCrAlTaY nanocrystalline coatings at 1000 ℃,were investigated.The results show that obvious surface oxidation and internal oxidation for the Ni-based superalloy occur at 900℃,and its oxidation kinetics curve has a wavy change;there are three layers in the oxidation region of Ni-base superalloy,the outer layer consists of Ti0_(2),Cr_(2)0,phases,the middle layer consists of Al_(2)0_(3),Si02 phases,and internal oxidation layer consists of Al_(2)0_(3)phase.The sputtered CoNiCrAlTaY nanocrystalline coating may effectively improve the oxidation resistance of the alloy,and the kinetic curve of the coated sample tested at 1000℃.obeys the parabolic rate law;no spalling of Al_(2)0_(3)films could be detected on the coating surface,and just a few internal oxidation(Al_(2)0_(3))appears inside the coating.

关 键 词：镍基高温合金 CoNiCrAlTaY涂层 高温氧化 纳米晶 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TB114.2[金属学及工艺—金属学]