Tensile fracture behavior of thermal barrier coatings on superalloy

被引：44

作者：

Chen, Z. B. ^{[1
]}

Wang, Z. G. ^{[1
]}

Zhu, S. J. ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[2] Fukuoka Inst Technol, Dept Intelligent Mech Engn, Higashi Ku, Fukuoka 8110295, Japan

来源：

SURFACE & COATINGS TECHNOLOGY | 2011年 / 205卷 / 15期

关键词：

Thermal barrier coating; Air plasma spraying; High velocity oxygen fuel; Tensile fracture; Interface fracture toughness; MECHANICAL-PROPERTIES; INTERFACE; CRACK; TBCS;

D O I：

10.1016/j.surfcoat.2011.02.005

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Tensile fracture behavior of thermal barrier coatings (TBCs) on superalloy was investigated in air at room temperature (RT). 650 degrees C and 850 degrees C. The bond coat NiCrAlY was fabricated by either high velocity oxygen fuel (HVOF) or air plasma spraying (APS), and the top coat 7%Y2O3-ZrO2 was deposited by APS. Thus two kinds of the TBC system were formed. It was shown that the coating had little effect on tensile stress-strain curves of the substrate and similar tensile strength was obtained in two kinds of the TBC system. However, the cracking behavior in the two kinds of TBC system at RT was different, which was also different from that at 650 degrees C and 850 degrees C by scanning electron microscopy. The interface fracture toughness of the two kinds of TBC system was evaluated by the Suo-Hutchinson model and the stress distribution in the coating and substrate was analyzed by the shear lag model. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：3931 / 3938

页数：8

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