Multilayer environmental barrier coatings

Patent metadata

Field	Value
Publication number	US-10351480-B2
Application number	US-201715424041-A
Country	US
Kind code	B2
Filing date	Feb 3, 2017
Priority date	Mar 12, 2013
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A method of making a multilayer environmental barrier coating for a ceramic matrix composite is provided, comprising the steps of: plasma spray coating an oxide-based bond coat over top of the ceramic matrix composite and depositing a columnar top coat over the oxide-based bond coat.

First claim

What is claimed is:

1. An article comprising:
a ceramic matrix composite;
an oxide-based bond coat over the ceramic matrix composite, wherein the oxide-based bond coat consists of HfSiO 4 +SiO 2 +Al 2 O 3 +Si, and wherein the Si is present in the oxide-based bond coat in an amount between about 10 wt. % and about 40 wt. %, the SiO 2 is present in the oxide-based bond coat in an amount between about 10 wt. % and about 30 wt. %, the Al 2 O 3 is present in the oxide-based bond coat in an amount between about 0.1 wt. % and about 10 wt. %, and the balance of the oxide-based bond coat is HfSiO 4 ; and
a top coat over the oxide-based bond coat.

2. The article of claim 1 , wherein the top coat is selected from the group consisting of RE 2 Si 2 O 7 and RE 2 SiO 5 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), RE 2 O 3 -stabilized ZrO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), and RE 2 O 3 -stabilized HfO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium).

3. The article of claim 1 , wherein the top coat has a columnar microstructure.

4. An article comprising:
a ceramic matrix composite;
an oxide-based bond coat over the ceramic matrix composite, wherein the oxide-based bond coat consists of HfSiO 4 +Al 2 O 3 +Si, and wherein the Si is present in the oxide-based bond coat in an amount between about 10 wt. % and about 40 wt. %, the Al 2 O 3 is present in the oxide-based bond coat in an amount between about 0.1 wt. % and about 10 wt. %, and the balance of the oxide-based bond coat is HfSiO 4 ; and
a top coat over the oxide-based bond coat.

5. The article of claim 4 , wherein the top coat is selected from the group consisting of RE 2 Si 2 O 7 and RE 2 SiO 5 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), RE 2 O 3 -stabilized ZrO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), and RE 2 O 3 -stabilized HfO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium).

6. The article of claim 4 , wherein the top coat has a columnar microstructure.

7. An article comprising:
a ceramic matrix composite;
an oxide-based bond coat over the ceramic matrix composite, wherein the oxide-based bond coat consists of HfSiO 4 +Si; and wherein the Si is present in the oxide-based bond coat in an amount between about 10 wt. % and about 40 wt. %, and the balance of the oxide-based bond coat is HfSiO 4 ; and
a top coat over the oxide-based bond coat.

8. The article of claim 7 , wherein the top coat is selected from the group consisting of RE 2 Si 2 O 7 and RE 2 SiO 5 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), RE 2 O 3 -stabilized ZrO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium), and RE 2 O 3 -stabilized HfO 2 (wherein RE is selected from the group consisting of at least one of lutetium, ytterbium, thulium, erbium, holmium, dysprosium, terbium, gadolinium, europium, samarium, promethium, neodymium, praseodymium, cerium, lanthanum, yttrium, and scandium).

9. The article of claim 7 , wherein the top coat has a columnar microstructure.

Assignees

• Rolls Royce Corp

Inventors

• Lee Kang N

Classifications

• C04B35/806

  Chemistry & Metallurgy · mapped topic

• C04B2235/3427

  Silicates other than clay, e.g. water glass · CPC title

• C04B35/62222

  obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23) · CPC title

• C04B41/52 Primary

  Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation} · CPC title

• C04B41/5037

  Clay, Kaolin · CPC title