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

Abstract

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.

Authors:
Publication Date:
Research Org.:
California Univ., Los Angeles, CA (USA)
OSTI Identifier:
5940472
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; FABRICATION; MECHANICAL PROPERTIES; BORON NITRIDES; SILICATES; SILICON OXIDES; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; DISPERSIONS; EXPERIMENTAL DATA; GRAIN DENSITY; HOT PRESSING; PARTICLE SIZE; SINTERING; SOL-GEL PROCESS; ALUMINIUM COMPOUNDS; BORON COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; DATA; INFORMATION; MATERIALS; MATERIALS WORKING; MICROSTRUCTURE; NITRIDES; NITROGEN COMPOUNDS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; PRESSING; SILICON COMPOUNDS; SIZE; 360601* - Other Materials- Preparation & Manufacture; 360603 - Materials- Properties

Citation Formats

Nazeri-Eshghi, A. Superabrasive cubic boron nitride-oxide composites prepared by sol-gel processing. United States: N. p., 1989. Web.
Nazeri-Eshghi, A. Superabrasive cubic boron nitride-oxide composites prepared by sol-gel processing. United States.
Nazeri-Eshghi, A. Sun . "Superabrasive cubic boron nitride-oxide composites prepared by sol-gel processing". United States.
@article{osti_5940472,
title = {Superabrasive cubic boron nitride-oxide composites prepared by sol-gel processing},
author = {Nazeri-Eshghi, A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Miscellaneous:
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