Exploratory research on silicon nitride composites. Final report

Technical Report · Fri Jun 25 04:00:00 EDT 1982

OSTI ID:5264720

Fischbach, D B; McLaren, D

Possibilities of making silicon nitride composites, reinforced with various ceramic fibers, by reaction bonding of particulate silicon matrices were explored with the objective of increasing material toughness. Two fabrication methods were developed using low volume fractions of fibers: lamination of CVD filaments between thin foils of polymer-bonded silicon; and casting of composites containing continuous or chopped fine fibers or filaments with aqueous or non-aqueous silicon slips. Further work is required to increase matrix density, optimize fiber/matrix bonding and increase fiber volume fraction. Both high modulus chemical vapor deposited silicon carbide filaments and low modulus boron nitride fine fibers were found to be compatible with reaction bonding processing. Poor matrix bonding resulted with fine silicon carbide fibers made from a polycarbosilane polymer precursor, because of a surface degradation reaction.

• Research Organization: Washington Univ., Seattle (USA). Dept. of Mining and Metallurgical and Ceramic Engineering
• DOE Contract Number: FG01-78ET13389
• OSTI ID: 5264720
• Report Number(s): DOE/ET/13389-T1; ON: DE82017286
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
CARBIDES
CARBON COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
FABRICATION
FLEXURAL STRENGTH
MATERIALS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES