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Preparation and Properties of Porous Aluminum Nitride–Silicon Carbide Composite Ceramics
Author(s) -
Hagen Eirik,
Grande Tor,
Einarsrud MariAnn
Publication year - 2004
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.1151-2916.2004.tb07714.x
Subject(s) - materials science , porosity , exothermic reaction , microstructure , microporous material , ceramic , composite material , nitride , composite number , silicon carbide , phase (matter) , silicon nitride , flexural strength , aluminium , grain size , layer (electronics) , chemistry , organic chemistry
Microporous two‐phase AlN–SiC composites were prepared using Al 4 C 3 and either Si (N 2 atmosphere) or Si 3 N 4 (Ar atmosphere) as precursors. The reaction mechanisms of the two synthesis routes and the effect of processing conditions on reaction rate and the material microstructures were demonstrated. The exothermic reaction between Si and Al 4 C 3 under N 2 atmosphere was shown to be a simple processing route for the preparation of porous two‐phase AlN–SiC materials. The homogeneous two‐phase AlN–SiC composites had a grain size in the range of 1–5 μm, and the porosity varied in the range of 36%–45%. The bending strength was 50–60 MPa, in accordance with the high porosity.