DZ466合金热障涂层CoCrAlY黏结层1050℃氧化行为

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...

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Bibliographic Details
Published in材料工程 no. 6; pp. 74 - 78
Main Author 任维鹏 李青 肖程波 宋尽霞 何利民 黄光宏 曹春晓
Format Journal Article
LanguageChinese
Published 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%北京航空材料研究院金属腐蚀与防护研究室,北京,100095 2014
Subjects
CoCrAlY
DZ466合金
氧化速率常数
热生长氧化物
黏结层
CoCrAlY
DZ466 alloy
oxidation rate constant
热生长氧化物
thermally grown oxide
氧化速率常数
DZ466合金
bond coating
黏结层
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ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2014.06.014

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Summary: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^-14cm^2/s,氧化400h后,氧化速率常数减小,为3.5×10^-14cm^2/s。
Bibliography: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（31cycles）.As-deposited CoCrAlY bond coating consists ofβ-CoAl phase andγ-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 intoγ-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 p
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2014.06.014