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Properties of Si 3 N 4 Produced by Nitriding Slip‐Cast Si Containing Si 3 N 4 Grog Additions
Author(s) -
Williams RobertM.,
Ezis Andre,
Caverly John C.,
Onoda G.Y.
Publication year - 1984
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.1151-2916.1984.tb18830.x
Subject(s) - grog , nitriding , slip (aerodynamics) , materials science , metallurgy , mineralogy , composite material , chemistry , thermodynamics , physics , layer (electronics)
The properties of Si 3 N 4 compositions produced by nitriding slip‐cast Si bodies containing up to 16% Si 3 N 4 grog were determined. The introduction of grog consistently lowered the densities, the room‐ and high‐temperature strengths, and the resistance to oxidation. The open structure of the grog‐containing mixes favored low‐temperature gas‐phase reactions leading to α‐Si 3 N 4 formation. In higher‐density compositions containing predominantly Si, gas‐liquid‐solid reactions at higher temperatures produced a relatively greater content of the β phase.