Ceramic material and insulating coating made thereof

• US 5,334,462 A
• Filed: 06/11/1993
• Issued: 08/02/1994
• Est. Priority Date: 09/08/1989
• Status: Expired due to Term

• Current Assignee: United Technologies Corporation (Rtx Corporation)
• Original Assignee: United Technologies Corporation (Rtx Corporation)
• Inventors: Vine, Raymond W., Anderson, Neal P.
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US08/075,870
• Time in Patent Office: 417 Days
• Field of Search: 501/134, 501/152, 428/697, 428/701, 428/702, 106/286.1, 106/286.8
• US Class Current: 428/697
• CPC Class Codes: C04B 35/50 based on rare-earth compounds non-oxide rare earth compounds C04B35/5156
• CPC Class Codes: C23C 14/025 Metallic sublayers
• CPC Class Codes: C23C 14/08 Oxides C23C14/10 takes precedence
• CPC Class Codes: C23C 4/02 Pretreatment of the material to be coated, e.g. for coating on selected surface areas
• CPC Class Codes: C23C 4/11 Oxides
• CPC Class Codes: F01D 5/288 Protective coatings for blades

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

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.

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

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

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