Yb2Si2O7 Environmental Barrier Coatings Deposited by Various Thermal Spray Techniques: A Preliminary Comparative Study

被引：125

作者：

Bakan, Emine ^{[1
]}

Marcano, Diana ^{[1
]}

Zhou, Dapeng ^{[1
]}

Sohn, Yoo Jung ^{[1
]}

Mauer, Georg ^{[1
]}

Vassen, Robert ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energy & Climate Res IEK 1, D-52425 Julich, Germany

来源：

JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2017年 / 26卷 / 06期

关键词：

ceramic matrix composite (CMC); environmental barrier coating (EBC); thermal spray; ytterbium silicate; SIO2 SCALE VOLATILITY; COMBUSTION CONDITIONS; PLASMA; RECESSION; MICROSTRUCTURE; CERAMICS; MULLITE; MODEL;

D O I：

10.1007/s11666-017-0574-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Dense, crack-free, uniform, and well-adhered environmental barrier coatings (EBCs) are required to enhance the environmental durability of silicon (Si)-based ceramic matrix composites in high pressure, high gas velocity combustion atmospheres. This paper represents an assessment of different thermal spray techniques for the deposition of Yb2Si2O7 EBCs. The Yb2Si2O7 coatings were deposited by means of atmospheric plasma spraying (APS), high-velocity oxygen fuel spraying (HVOF), suspension plasma spraying (SPS), and very low-pressure plasma spraying (VLPPS) techniques. The initial feedstock, as well as the deposited coatings, were characterized and compared in terms of their phase composition. The as-sprayed amorphous content, microstructure, and porosity of the coatings were further analyzed. Based on this preliminary investigation, the HVOF process stood out from the other techniques as it enabled the production of vertical crack-free coatings with higher crystallinity in comparison with the APS and SPS techniques in atmospheric conditions. Nevertheless, VLPPS was found to be the preferred process for the deposition of Yb2Si2O7 coatings with desired characteristics in a controlled-atmosphere chamber.

引用

页码：1011 / 1024

页数：14

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