Microstructure and properties of self-reinforced silicon nitride

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb04010.x· OSTI ID:5519608

Pyzik, A J ^[1]; Beaman, D R ^[2]

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1. Dow Chemical Co., Midland, MI (United States). Advanced Ceramics Lab.
2. Dow Chemical Co., Midland, MI (United States). Analytical Sciences

Problems associated with manufacturing Si[sub 3]N[sub 4]/SiC-whisker composites have been overcome by developing self-reinforced Si[sub 3]N[sub 4] with elongated [beta]-Si[sub 3]N[sub 4] grains formed in situ from oxynitride glass. This Si[sub 3]N[sub 4]-Y[sub 2]O[sub 3]-MgO-SiO[sub 2]-CaO-based material has a flexure strength > 1,000 MPa and fracture toughness > 8 MPa [center dot] m[sup [1/2]]. The optimum combination of mechanical properties has been obtained with Y[sub 2]O[sub 3]:MgO ratios ranging from 3:1 to 1:2, CaO contents ranging from 0.1 to 0.5 wt%, and Si[sub 3]N[sub 4] contents between 90 and 96 wt%.

• OSTI ID: 5519608
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTALS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
WHISKERS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES