Performance of TBCs system due to the different thicknesses of top ceramic layer

被引：27

作者：

Fang, Xufei ^{[1
]}

Zhang, Guobing ^{[1
]}

Feng, Xue ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Engn Mech, AML, Beijing 100084, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2015年 / 41卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Thermal barrier coating; Ceramic layer thickness; Porosity; Oxidation; THERMAL-BARRIER COATINGS; INTERFACIAL DELAMINATION; MECHANICAL-PROPERTIES; SURFACE CRACKING; GROWN OXIDE; POROSITY; SPRAY; YSZ;

D O I：

10.1016/j.ceramint.2014.10.105

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) with thicknesses of 200 mu m and 400 mu m were sprayed using supersonic plasma spraying (SPS) on FeNi-based substrate and Ni-based substrate, respectively. Bonding strengths of FeNi-based substrate and Ni-based substrate with different thicknesses of coatings were investigated. Bonding strength tests revealed different fracture mechanisms for the specimens with thin topcoat and thick topcoat. Scanning electron microscope (SEM) and metallographic microscope observation of the crossing sections revealed that the porosity of the thin coating was smaller than that of the thick coating, and the distribution of the porosity further determines the location of the fracture zones. Thermally grown oxide (TGO) with different thicknesses grows on the interface of the bond coat (BC) and top ceramic layer due to oxidation. Analysis validates that thickness of the topcoat plays an important role in the diffusion of oxygen and oxidation rate of the TGO while the porosity has little effect on the oxidation rate. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：2840 / 2846

页数：7

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