Ternary ceramic alloys of Zr-Ce-Hf oxides
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.
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
- Patent Number(s):
- US 4971933; A
- Application Number:
- PPN: US 7-323633
- OSTI ID:
- 7268612
- Country of Publication:
- United States
- Language:
- English
Similar Records
Properties of zirconia-ceria-hafnia alloys
High-temperature evaluation of new ferroelastic-toughened ceramic materials. Final report, 15 August 1987-15 February 1988
Related Subjects
360200* -- Ceramics
Cermets
& Refractories
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CONCENTRATION RATIO
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DENSITY
FRACTURE PROPERTIES
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES