Process for making a titanium diboride-chromium diboride-yttrium titanium oxide ceramic composition
A ceramic composition is described. The ceramic composition consists essentially of from about 84 to 96 w/o titanium diboride, from about 1 to 9 w/o chromium diboride, and from about 3 to about 15 w/o yttrium-titanium-oxide. A method of making the ceramic composition is also described. The method of making the ceramic composition comprises the following steps: Step 1--A consolidated body containing stoichiometric quantities of titanium diboride and chromium diboride is provided. Step 2--The consolidated body is enclosed in and in contact with a thermally insulated package of yttria granules having a thickness of at least 0.5 inches. Step 3--The consolidated body enclosed in the thermally insulated package of yttria granules is heated in a microwave oven with microwave energy to a temperature equal to or greater than 1,900 degrees centigrade to sinter and uniformly disperse yttria particles having a size range from about 1 to about 12 microns throughout the consolidated body forming a densified body consisting essentially of titanium diboride, chromium diboride, and yttrium-titanium-oxide. The resulting densified body has enhanced fracture toughness and hardness. No Drawings
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
- Patent Number(s):
- A; US 5108670
- Application Number:
- PPN: US 7-641231
- OSTI ID:
- 7284177
- Country of Publication:
- United States
- Language:
- English
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Titanium diboride-chromium diboride-yttrium titanium oxide ceramic composition and a process for making the same
Titanium diboride-chromium diboride-yttrium titanium oxide ceramic composition and a process for making the same
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHROMIUM BORIDES
CHROMIUM COMPOUNDS
DENSITY
DISPERSIONS
FABRICATION
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
SINTERING
SIZE
TITANIUM BORIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES