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:
- Issue Date:
- OSTI Identifier:
- 7268612
- Patent Number(s):
- 4971933
- Application Number:
- PPN: US 7-323633
- Assignee:
- Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
- 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.
@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}
}
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