Thermal barrier coating having high phase stability

Patent · Tue Jan 01 04:00:00 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
• 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

-05ltoreqxltoreq05
/428/416/427/
10
22
28
30
40
agd
ala
asupnsub2-x
barrier
bhf
bsupmsub2x
bti
bzr
ceramic
ceramic thermal
characterized
chemical
chemical formula
coating
combinations
comprising
consisting
crystal
deposited
device
elements
equ1
eu
excluding
following
formula
gaps
gd
hf
layer
microstructure
mixtures
osub7-y
phase
phase stability
pyrochlore
selected
stability
structure
substrate
tb
thermal
tm
valence
x0
y0
zr