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), Journal Name: Sov. Powder Metall. Met. Ceram. (Engl. Transl.); (United States) Vol. 27:1; ISSN SPMCA
- Country of Publication:
- United States
- Language:
- English
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BORON COMPOUNDS
BORON NITRIDES
CERAMICS
CHEMICAL REACTIONS
CROSS-LINKING
CRYSTAL STRUCTURE
FABRICATION
HARDENING
HEAT RESISTANT MATERIALS
HEAT TREATMENTS
HOT PRESSING
IMPREGNATION
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALLURGY
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
PNICTIDES
POLYMERIZATION
POROSITY
POWDER METALLURGY
PRESSING
PYROLYSIS PRODUCTS
SINTERING
TEMPERATURE EFFECTS