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Fine‐Grained Silicon Nitride Ceramics Prepared from β‐Powder
Author(s) -
Mitomo Mamoru,
Hirotsuru Hideki,
Suematsu Hisayuki,
Nishimura Toshiyuki
Publication year - 1995
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.1151-2916.1995.tb08385.x
Subject(s) - materials science , ceramic , microstructure , grinding , sintering , silicon nitride , particle size , hot pressing , grain size , metallurgy , composite material , composite number , pressing , micrometer , particle (ecology) , sedimentation , silicon , chemical engineering , paleontology , oceanography , physics , optics , sediment , engineering , biology , geology
Fine β‐powder with an average particle size of 0.28 μm was prepared by grinding and centrifugal sedimentation of sub‐micrometer β‐powder. Fine‐ and uniform‐grained ceramics were fabricated from the powder by hot pressing. The average grain size of the ceramic was 0.21 μm. It was shown that this kind of microstructure was desirable for the matrix of in situ composite. It was also shown that the ceramics could be superplastically deformed at a temperature as low as 1500°C.