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research-article

Development of Highly Durable Thermal Barrier Coating by Suppression of Thermally Grown Oxide

[+] Author and Article Information
Masahiro Negami

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
negami_masahiro@khi.co.jp

Shinya Hibino

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
hibino_shinya@khi.co.jp

Akihito Kawano

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
kawano_akihito@khi.co.jp

Yoshimichi Nomura

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
nomura_ym@khi.co.jp

Ryozo Tanaka

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
tanaka_r@khi.co.jp

Kenichiroh Igashira

Kawasaki Heavy Industries, Ltd., 1-1, Kawasaki-Cho, Akashi City, Japan
igashira_kenichiroh@khi.co.jp

1Corresponding author.

ASME doi:10.1115/1.4038607 History: Received August 01, 2017; Revised September 14, 2017

Abstract

Durability of thermal barrier coating (TBC) systems is important because of recent rising of TIT (Turbine inlet temperature) for improved efficiency of industrial gas turbine engines. For improving durability of TBC, we focused on thermal pre-oxidation methods as a means for forming an alpha-Al2O3 barrier layer on the bond coat. The alpha-Al2O3 barrier layer is effective in reducing the growth rate of thermally grown oxide (TGO). We studied the suitable pre-oxidation conditions for forming barrier layer. In this study, we analyzed the oxidation behavior of the bond coat surface during pre-oxidation heat treatment by means of in-situ synchrotron X-ray diffraction (XRD) analysis. As a result, if the thermal treatment is conducted under some specific low oxygen partial pressure condition, only alpha-Al2O3 is formed without formation of metastable alumina. TEM analysis of oxide scale formed after pre-oxidation heat treatment revealed that a monolithic alpha-Al2O3 layer is formed on the bond coat if pre-oxidation is performed under specific oxygen partial pressure conditions. We performed a durability evaluation test of TBC with the monolithic alpha-Al2O3 layer formed by pre-oxidation of the bond coat. An isothermal oxidation test confirmed that the growth of TGO in the TBC that had undergone pre-oxidation was more favorably suppressed than that in the TBC without pre-oxidation.

Copyright (c) 2017 by ASME
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