Compositions for erosion and molten dust resistant environmental barrier coatings

Patent metadata

Field	Value
Publication number	US-10696601-B2
Application number	US-201715689406-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Aug 29, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

Compounds are generally provided, which may be particularly used to form a layer in a coating system. In one embodiment, the compound may have the formula: A x B b Ln 1−x−b Hf 1−t−d Ti t D d MO 6 , where: A is Al, Ga, In, Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Fe, Cr, Co, Mn, Bi, or a mixture thereof; x is about 0.01 to about 0.99; b is 0 to about 0.5, with 1−x−b being 0 to about 0.99 such that Ln is present in the compound; Ln is a rare earth or a mixture thereof that is different than A; t is 0 to about 0.99; D is Zr, Ce, Ge, Si, or a mixture thereof; d is 0 to about 0.5; the sum of t and d is less than 1 such that Hf is present in the compound; and M is Ta, Nb, or a mixture thereof.

First claim

What is claimed is:

1. An aluminum containing hafnium tantalate having the formula:
Al 1−x−y A′ x A″ y HfTaO 6

where:
A′ is Er, Sm, or a mixture thereof;
x is about 0.3 to about 0.45;
A″ is In, Ga, or a mixture thereof;
y is about 0.15 to about 0.35; and
(x+y) is about 0.5 to about 0.7.

2. The aluminum containing hafnium tantalate of claim 1 , wherein A′ is Er or Sm, and wherein A″ is In or Ga.

3. The aluminum containing hafnium tantalate of claim 1 , having the formula: Er 0.33 Al 0.37 In 0.3 HfTaO 6 .

4. The aluminum containing hafnium tantalate of claim 1 , having the formula: Sm 043 Al 0.4 Ga 0.17 HfTaO 6 .

5. The aluminum containing hafnium tantalate of claim 1 , having the formula: Sm 0.29 Al 0.42 In 0.29 HfTaO 6 .

6. The aluminum containing hafnium tantalate of claim 1 , having the formula: Sm 0.36 Al 047 In 0.17 HfTaO 6 .

Assignees

• Gen Electric

Inventors

• Kirby Glen Harold

Classifications

• C04B35/495 Primary

  based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title

• C04B2235/3272

  Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · CPC title

• C04B2235/3298

  Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate · CPC title

• C04B2235/3287

  Germanium oxides, germanates or oxide forming salts thereof, e.g. copper germanate · CPC title