Superabrasive cubic boron nitride-oxide composites prepared by sol-gel processing

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5940472

Nazeri-Eshghi, A

Superabrasive cubic boron nitride (CBN) grains were incorporated in different oxide matrices prepared through sol-gel processing. CBN grains of different particle size from 0.5 to 25 microns were homogeneously dispersed in alumina, alumina-silicate and silica gels. Monolithic composites were achieved upon firing to higher temperatures either by sintering or hot-pressing. Densification of these composites versus temperature was monitored by continuous shrinkage measurements in a dilatometer. The effect of particle size and the volume content of CBN on densification of the gel matrix was investigated. Experimental results were compared with the theories on gel shrinkage and densification of heterogeneous ceramic powders. Reactions at the interface between the CBN particles and the gel matrix and some mechanical properties of the composites were studied.

• Research Organization: California Univ., Los Angeles, CA (USA)
• OSTI ID: 5940472
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BORON COMPOUNDS
BORON NITRIDES
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DATA
DISPERSIONS
EXPERIMENTAL DATA
FABRICATION
GRAIN DENSITY
HOT PRESSING
INFORMATION
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PNICTIDES
PRESSING
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SIZE
SOL-GEL PROCESS