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Title: Ternary ceramic alloys of Zr-Ce-Hf oxides

Abstract

A ternary ceramic alloy is described which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce[sub x]Hf[sub y]Zr[sub 1[minus]x[minus]y]O[sub 2], is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites. 1 fig.

Inventors:
;
Publication Date:
OSTI Identifier:
7268612
Patent Number(s):
US 4971933; A
Application Number:
PPN: US 7-323633
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; EDB-94-116461
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Patent File Date: 14 Mar 1989
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM OXIDES; CRYSTAL STRUCTURE; DENSITY; MECHANICAL PROPERTIES; SYNTHESIS; HAFNIUM OXIDES; ZIRCONIUM OXIDES; CONCENTRATION RATIO; CRYSTAL-PHASE TRANSFORMATIONS; FRACTURE PROPERTIES; CERIUM COMPOUNDS; CHALCOGENIDES; HAFNIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; REFRACTORY METAL COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360200* - Ceramics, Cermets, & Refractories

Citation Formats

Becher, P.F., and Funkenbusch, E.F.. Ternary ceramic alloys of Zr-Ce-Hf oxides. United States: N. p., 1990. Web.
Becher, P.F., & Funkenbusch, E.F.. Ternary ceramic alloys of Zr-Ce-Hf oxides. United States.
Becher, P.F., and Funkenbusch, E.F.. Tue . "Ternary ceramic alloys of Zr-Ce-Hf oxides". United States. doi:.
@article{osti_7268612,
title = {Ternary ceramic alloys of Zr-Ce-Hf oxides},
author = {Becher, P.F. and Funkenbusch, E.F.},
abstractNote = {A ternary ceramic alloy is described which produces toughening of zirconia and zirconia composites through the stress transformation from tetragonal phase to monoclinic phase. This alloy, having the general formula Ce[sub x]Hf[sub y]Zr[sub 1[minus]x[minus]y]O[sub 2], is produced through the addition of appropriate amounts of ceria and hafnia to the zirconia. Typically, improved toughness is achieved with about 5 to about 15 mol % ceria and up to about 40 mol % hafnia. The preparation of alloys of these compositions are given together with data as to the densities, tetragonal phase content, hardness and fracture toughness. The alloys are useful in preparing zirconia bodies as well as reinforcing ceramic composites. 1 fig.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 20 00:00:00 EST 1990},
month = {Tue Nov 20 00:00:00 EST 1990}
}