Boron nitride ceramics: problems and development perspectives
The heat resistance, high thermal shock resistance, chemical inertness, structure, and lubricating ability of boron nitride ceramics are discussed along with its uses in high temperature and abrasive applications. Problems are reviewed in sintering, hardening, and impurity control procedures. The most effective strengthening agents for boron nitride ceramics were determined to be organosilicon compounds. A method using molecular thermal cross-linking to incorporate these agents into the ceramic is outlined. The method consists of applying thin layers to powder particles, performing heat treatment until these layers break down and impregnate the pore structure and then cross-link with active pyrolysis products. Comparative data are tabulated for pyrolytic, hot pressed, and sintered boron nitrides with several strengthening agents.
- OSTI ID:
- 6336239
- Journal Information:
- Sov. Powder Metall. Met. Ceram. (Engl. Transl.); (United States), Vol. 27:1; Other Information: Translated from Poroshkovaya Metallurgiya; 27: No. 1, 23-31(Jan 1988)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON NITRIDES
POWDER METALLURGY
CERAMICS
CROSS-LINKING
HARDENING
HEAT RESISTANT MATERIALS
HEAT TREATMENTS
HOT PRESSING
IMPREGNATION
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
ORGANIC SILICON COMPOUNDS
POROSITY
PYROLYSIS PRODUCTS
SINTERING
TEMPERATURE EFFECTS
BORON COMPOUNDS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
FABRICATION
MATERIALS
MATERIALS WORKING
METALLURGY
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
PNICTIDES
POLYMERIZATION
PRESSING
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties