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Title: Thermal barrier coating having high phase stability

Abstract

A device (10) comprising a substrate (22) having a deposited ceramic thermal barrier coating characterized by a microstructure having gaps (28) where the thermal barrier coating comprises a first thermal barrier layer (40), and a second thermal barrier layer (30) with a pyrochlore crystal structure having a chemical formula of A.sup.n+.sub.2-x B.sup.m+.sub.2+x O.sub.7-y, where A is selected from the group of elements consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and mixtures thereof, where B is selected from the group of elements consisting of Zr, Hf, Ti and mixtures thereof, where n and m are the valence of A and B respectively, and for -0.5.ltoreq.x.ltoreq.0.5, ##EQU1## and excluding the following combinations for x=0, y=0: A=La and B=Zr; A=La and B=Hf; A=Gd and B=Hf; and A=Yb and B=Ti.

Inventors:
 [1]
  1. Oviedo, FL
Issue Date:
Research Org.:
Westinghouse Electric Corp., Pittsburgh, PA (United States)
OSTI Identifier:
874429
Patent Number(s):
6387539
Assignee:
Siemens Westinghouse Power Corporation (Orlando, FL)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
DOE Contract Number:  
AC05-95OR22242
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
thermal; barrier; coating; phase; stability; device; 10; comprising; substrate; 22; deposited; ceramic; characterized; microstructure; gaps; 28; layer; 40; 30; pyrochlore; crystal; structure; chemical; formula; asupnsub2-x; bsupmsub2x; osub7-y; selected; elements; consisting; eu; gd; tb; tm; mixtures; zr; hf; valence; -05ltoreqxltoreq05; equ1; excluding; following; combinations; x0; y0; ala; bzr; bhf; agd; bti; chemical formula; phase stability; ceramic thermal; /428/416/427/

Citation Formats

Subramanian, Ramesh. Thermal barrier coating having high phase stability. United States: N. p., 2002. Web.
Subramanian, Ramesh. Thermal barrier coating having high phase stability. United States.
Subramanian, Ramesh. Tue . "Thermal barrier coating having high phase stability". United States. https://www.osti.gov/servlets/purl/874429.
@article{osti_874429,
title = {Thermal barrier coating having high phase stability},
author = {Subramanian, Ramesh},
abstractNote = {A device (10) comprising a substrate (22) having a deposited ceramic thermal barrier coating characterized by a microstructure having gaps (28) where the thermal barrier coating comprises a first thermal barrier layer (40), and a second thermal barrier layer (30) with a pyrochlore crystal structure having a chemical formula of A.sup.n+.sub.2-x B.sup.m+.sub.2+x O.sub.7-y, where A is selected from the group of elements consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and mixtures thereof, where B is selected from the group of elements consisting of Zr, Hf, Ti and mixtures thereof, where n and m are the valence of A and B respectively, and for -0.5.ltoreq.x.ltoreq.0.5, ##EQU1## and excluding the following combinations for x=0, y=0: A=La and B=Zr; A=La and B=Hf; A=Gd and B=Hf; and A=Yb and B=Ti.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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