Patent Number: 6,168,745

Title: Method for forming t'-phase zirconia for high temperature applications

Abstract: A t'-phase zirconia shapes with superior properties are made by forming a zirconia powder containing a rare-earth-oxide dopant into sintered bodies. The sintered bodies are heat treated in an oxygen atmosphere at a temperature high enough to form a cubic phase. The heated body is then cooled rapidly to form a t'-phase. The t'-phase is characterized with a large grain size, is resistant to transformation, low temperature degradation, and has excellent toughness, and creep resistance. Rare earth-oxide dopants include yttria, scandia, erbia, and ceria. For yttria doped materials, the sintered body is doped with between 2.5 and 5 mole percent yttria.

Inventors: Jue; Jan-Fong (Salt Lake City, UT), Virkar; Anil Vasudeo (Salt Lake City, UT)

Assignee: Materials and Systems Research, Inc.

International Classification: C04B 35/486 (20060101); C04B 35/64 (20060101); H05B 006/00 (); B29C 071/00 ()

Expiration Date: 01/02/2018