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�������պ����ѧѧ�� 2004, Vol. 30 Issue (03) :272-275    DOI:
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Residual stress analysis of thermal barrier coatings
Li Zhihua, Li Huanxi, Xu Huibin, Gong Shengkai*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� An expression for calculating residual stresses in a thermal barrier coating structure was developed. Effects of Young's modulus, coefficients of thermal expansion (CTE) and thicknesses of the ceramic coating and thermally grown oxide (TGO) were analyzed based on the expression. The main results are as follows: compressive in-plane residual stresses are generated with lowering temperature in both ceramic coating and TGO, which exhibits a linear relationship with the temperature drop. And the greater the Young's modulus or the less the CTE, the greater the residual stress in ceramic coating or in TGO. While the influence of thickness on residual stress is negligible. The maximum residual stress in ceramic coating is about 300?MPa, much less than the compressive strength of bulk ceramic material. On the above results, it is suggested that buckling of delaminated ceramic coating should be responsible for its final spallation.
Keywords�� thermal barrier coatings   residual stress   failure analysis     
Received 2003-02-09;
About author: ��־��(1971-),��,�ӱ���ɽ��,˶ʿ��, tslizhihua@tom.com.
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��־��, ���ϲ, ��ݱ�, ������.����Ϳ��IJ���Ӧ������[J]  �������պ����ѧѧ��, 2004,V30(03): 272-275
Li Zhihua, Li Huanxi, Xu Huibin, Gong Shengkai.Residual stress analysis of thermal barrier coatings[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(03): 272-275
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2004/V30/I03/272
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