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Microstructural Observations on Hot‐Pressed Si 3 N 4
Author(s) -
Greskovich C.
Publication year - 1981
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.1151-2916.1981.tb09568.x
Subject(s) - materials science , microstructure , hot pressing , phase (matter) , metallurgy , grain growth , mineralogy , chemistry , organic chemistry
The development of microstructure in hot‐pressed Si a N 4 was studiehd for a typical Si 3 N 4 powder with and without BeSiN 2 as a densification aid. The effect of hot‐pressing temperature on density, α‐ to β‐Si 3 N 4 conversion and specific surface area showed that BeSiN 2 appears to increase the mobility of the system by enhancing densification, α‐ to β‐Si 3 N 4 transformation, and grain growth at temperatures between 1450° and 1800°. These processes appear to occur in the presence of a liquid phase.