Combustion synthesis of silicon nitride-silicon carbide composites

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06488.x· OSTI ID:5194259

Agrafiotis, C C; Lis, J; Puszynski, J A; Hlavacek, V ^[1]

---

1. Lab. for Reaction and Ceramic Engineering, Dept. of Chemical Engineering, State Univ. of New York at Buffalo, Buffalo, NY (US)

The feasibility of synthesizing silicon nitride-silicon carbide composites by self-propagating high- temperature reactions is demonstrated. Various mixtures of silicon, silicon nitride, and carbon powders were ignited under a nitrogen pressure of 30 atm ({approx equal}3 MPa), to produce a wide composition range of Si{sub 3}N{sub 4}-SiC powder products. Products containing up to 17 vol% of SiC, after being attrition milled, could be hot-pressed to full density under 1700{degrees}C, 3000 psi ({approx equal}21 MPa) with 4 wt% of Y{sub 2}O{sub 3}. The microhardness and fracture toughness of these composites were superior to those of the pure {beta}- Si{sub 3}N{sub 4} matrix material and compared very well with the properties of traditionally prepared composites.

• OSTI ID: 5194259
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 73:11; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
COMBUSTION
COMPOSITE MATERIALS
FABRICATION
HARDNESS
HOT PRESSING
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROHARDNESS
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
PNICTIDES
POWDERS
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
THERMOCHEMICAL PROCESSES