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Combustion Synthesis of Silicon Nitride‐Silicon Carbide Composites
Author(s) -
Agrafiotis Christos C.,
Lis Jerzy,
Puszynski Jan A.,
Hlavacek Vladimir
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06488.x
Subject(s) - materials science , silicon carbide , silicon nitride , fracture toughness , silicon , composite material , carbide , nitride , combustion , carbon fibers , composite number , metallurgy , chemistry , organic chemistry , layer (electronics)
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 (∼ 3 MPa), to produce a wide composition range of Si 3 N 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°C, 3000 psi (∼ 21 MPa) with 4 wt% of Y 2 O 3 . The microhardness and fracture toughness of these composites were superior to those of the pure β‐Si 3 N 4 matrix material and compared very well with the properties of “traditionally” prepared composites.