# US 5,334,462 A · Ceramic material and insulating coating made thereof

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- Number: US 5,334,462 A
- Document ID: US5334462A
- Status: Granted
- Kind: A
- Application number: 08/075,870
- Filed: 1993-06-11
- Granted: 1994-08-02
- Earliest claimed: 1989-09-08
- Assignees: United Technologies Corporation
- Inventors: Raymond W. Vine; Neal P. Anderson
- Web page: https://patentgrep.com/patent/US5334462A

## CPC

- C23C 4/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C04B 35/50: based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)}
- C23C 4/11: Oxides
- C23C 14/025: {Metallic sublayers}
- C23C 14/08: Oxides (C23C14/10 takes precedence)
- F01D 5/288: {Protective coatings for blades}
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)

## Abstract

A yttria strengthened ceria material is disclosed. The addition of a small amount of yttria (for example 0.5%) significantly strengthens the ceria. The yttria modified ceria is useful as a thermal barrier coating.

## Claims

### Claim 1

A hard insulating single phase ceramic material consisting essentially of ceria and an amount of yttria sufficient to increase the room temperature hardness by at least 50% over the room temperature hardness of ceria when measured according to the Vickers Hardness test using a 500 gram load.

### Claim 2 (depends on 1)

A material as in claim 1 wherein sufficient yttria is added to increase the room temperature Vickers hardness by at least 100%.

### Claim 3 (depends on 1)

Material as in claim 1 containing from about 0.1 to about 5 wt. % yttria.

### Claim 4 (depends on 1)

Material as in claim 1 containing from about 0.2 to about 2 wt. % yttria.