Microwave sintering of titanium diboride
Titanium diboride was heated to high temperatures using microwaves. The highest temperature obtained was 2245/degree/C. Unfortunately, oxidation was a problem, especially at the higher temperatures, although an argon flush and a carbon getter were used. To completely stop oxidation, the oxygen potential must be below 10/sup /minus/18/ atmospheres. Using an argon flush and a carbon getter, titanium diboride was successfully densified to 82% of theoretical without measurable oxidation by heating with microwaves to 1860/degree/C. Density actually decreased upon reaching temperatures above 1860/degree/C due to void formation adjacent to the surface. Void formation is thought to be due to the formation of B/sub 2/O/sub 3/(g) which evolves rapidly above 1860/degree/C because of the loss of a TiO/sub 2/ protective film which melts at this temperature. 9 refs., 12 figs., 2 tabs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6361012
- Report Number(s):
- LA-UR-89-533; CONF-890130-2; ON: DE89007988
- Resource Relation:
- Journal Volume: 10; Conference: 13. annual conference on composites and advanced ceramics, Cocoa Beach, FL, USA, 15 Jan 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TITANIUM BORIDES
SINTERING
BORON OXIDES
DENSITY
MICROSTRUCTURE
MICROWAVE HEATING
OXIDATION
PHASE DIAGRAMS
STABILITY
VERY HIGH TEMPERATURE
VOIDS
BORIDES
BORON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DIAGRAMS
FABRICATION
HEATING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies