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Phase Relations in the Si 3 N 4 ‐Rich Portion of the Si 3 N 4 –AlN–Al 2 O 3 –Y 2 O 3
Author(s) -
Jfukuhara Mlkio
Publication year - 1988
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.1151-2916.1988.tb05942.x
Subject(s) - melilite , phase (matter) , crystallography , materials science , solid solution , r phase , chemistry , microstructure , metallurgy , organic chemistry , spinel , martensite
The phase relations in the Si 3 N 4 ‐rich portion of the Si 3 N 4 –AlN–Y 2 O 3 rystem were investigated using hot‐pressed bodies. The one‐phase fields of β3 and α, the twophase fields of β+α, β+M (M=melilite), and α+M, and the three‐phase fields of β+α+M were observed in the Si 3 N 4 ‐rich portion. The α‐ and β‐sialons are not two different compounds but an allotropic transformation phase of the Si–Al–O–N system, and an α solid solution expands and stabilizes with increasing Y 2 O 3 content. Therefore, the formulas of the two sialons should be the same.