Titanium diboride-chromium diboride-yttrium titanium oxide ceramic composition and a process for making the same

Patent · Tue May 07 00:00:00 EDT 1991

OSTI ID:5771051

Holcombe, C E; Dykes, N L

This patent describes a ceramic composition. 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.

• Assignee: Martin Marietta Energy Systems, Inc., Oak Ridge, TN (USA)
• Patent Number(s): US 5013694; A
• Application Number: PPN: US 7-513337; TRN: 92-008333
• OSTI ID: 5771051
• Resource Relation: Patent File Date: 20 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CHEMICAL COMPOSITION
POWDERS
FABRICATION
HARDNESS
STOICHIOMETRY
TITANIUM BORIDES
TITANIUM OXIDES
YTTRIUM OXIDES
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties