Thermal barrier coating having high phase stability

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874429

Subramanian, Ramesh ^[1]

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1. Oviedo, FL

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.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (United States)
• DOE Contract Number: AC05-95OR22242
• Assignee: Siemens Westinghouse Power Corporation (Orlando, FL)
• Patent Number(s): US 6387539
• OSTI ID: 874429
• Country of Publication: United States
• Language: English

Related Subjects

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
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