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材料工程  2014, Vol. 0 Issue (6): 74-78    DOI: 10.11868/j.issn.1001-4381.2014.06.014
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
DZ466合金热障涂层CoCrAlY黏结层1050℃氧化行为
任维鹏1, 李青1, 肖程波1, 宋尽霞1, 何利民2, 黄光宏2, 曹春晓1
1. 北京航空材料研究院 先进高温结构材料重点实验室, 北京 100095;
2. 北京航空材料研究院 金属腐蚀与防护研究室, 北京 100095
Oxidation Behavior of CoCrAlY Bond Coating for Thermal Barrier Coating on DZ466 Super Alloy at 1050℃
REN Wei-peng1, LI Qing1, XIAO Cheng-bo1, SONG Jin-xia1, HE Li-min2, HUANG Guang-hong2, CAO Chun-xiao1
1. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Metal Corrosion and Surface Protection Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China
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摘要 采用电子束物理气相沉积(EB-PVD)法在一种新型定向合金DZ466试样上沉积CoCrAlY黏结层和Y2O3部分稳定的ZrO2(YSZ)陶瓷层,对试样进行1050℃循环氧化实验并研究其氧化行为。采用X射线衍射仪、扫描电镜以及电子探针对涂层进行显微组织分析。结果表明:在1050℃氧化1500h(热循环31次)后,热障涂层未出现脱落现象。沉积态CoCrAlY黏结层主要由β-CoAl相和γ-Co固溶体相组成;1050℃氧化后,在黏结层与陶瓷层界面生成热生长氧化物(TGO)层,黏结层逐渐发生退化,β-CoAl相逐渐转化为γ-CoNi固溶体;氧化1200h后,TGO/黏结层界面出现由活性元素效应导致的氧化物栓;TGO层皱曲行为导致TGO/陶瓷层界面出现微裂纹,并且该微裂纹沿界面横向扩展。TGO的厚度增长模式符合分段抛物线规律,初期氧化速率常数约为6.1×10-14cm2/s,氧化400h后,氧化速率常数减小,为3.5×10-14cm2/s。
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任维鹏
李青
肖程波
宋尽霞
何利民
黄光宏
曹春晓
关键词 DZ466合金CoCrAlY黏结层热生长氧化物氧化速率常数    
Abstract:CoCrAlY bond coating and Y2O3 partially stabilized ZrO2 ceramic coating were deposited by electron beam physical vapor deposition (EB-PVD), and the cyclic oxidation behavior of the samples were measured at 1050℃. X-ray diffraction, scanning electron microscopy and electron probe microanalysis were employed to examine the microstructure. The results show that the thermal barrier coating (TBC) remains intact after exposure at 1050℃ for 1500h (31 cycles). As-deposited CoCrAlY bond coating consists of β-CoAl phase and γ-Co solid solution, thermally grown oxide (TGO) appears at the interface of bond coating and ceramic coating during exposure at 1050℃ and meanwhile degradation of bond coating occurs, β-CoAl phase gradually transforms into γ-Co solid solution. Oxide pegs form at the TGO/bong coating interface due to reactive elements effect after oxidation for 1200h. Rumpling of TGO induces micro-cracks at interface of TGO/ceramic coating, and the micro-cracks propagate along the interface. Thickness growth mode of TGO follows staged parabolic law, the initial oxidation rate constant is about 6.1×10-14cm2/s, after exposure for 400h, the oxidation rate constant decreases to 3.5×10-14cm2/s.
Key wordsDZ466 alloy    CoCrAlY    bond coating    thermally grown oxide    oxidation rate constant
收稿日期: 2014-01-05     
1:  TG174.451  
基金资助:国家863计划资助项目(2012AA03A511);工信部科技专项资助项目(2012ZX04007-021-03)
作者简介: 任维鹏 (1984- ),男,博士,主要研究方向为高温合金及其防护涂层,联系地址:北京81信箱1分箱(100095),E-mail:weipengrxx@126.com
引用本文:   
任维鹏, 李青, 肖程波, 宋尽霞, 何利民, 黄光宏, 曹春晓. DZ466合金热障涂层CoCrAlY黏结层1050℃氧化行为[J]. 材料工程, 2014, 0(6): 74-78.
REN Wei-peng, LI Qing, XIAO Cheng-bo, SONG Jin-xia, HE Li-min, HUANG Guang-hong, CAO Chun-xiao. Oxidation Behavior of CoCrAlY Bond Coating for Thermal Barrier Coating on DZ466 Super Alloy at 1050℃. Journal of Materials Engineering, 2014, 0(6): 74-78.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2014.06.014      或      http://jme.biam.ac.cn/jme/CN/Y2014/V0/I6/74
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