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AlN Matrix Composites Fabricated via an Infiltration and Reaction Approach
Author(s) -
Aghajanian Michael K.,
Biel John P.,
Smith Russell G.
Publication year - 1994
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.1151-2916.1994.tb07071.x
Subject(s) - materials science , composite material , flexural strength , ceramic , ceramic matrix composite , melting point , infiltration (hvac) , alloy , chemical vapor infiltration
Novel AlN‐based ceramic matrix composites were produced using a two‐step infiltration and reaction process. Molten Al alloy was infiltrated without pressure into preforms containing Si 3 N 4 particles (mixed α and β phases). The resultant composites were heat‐treated, causing hard phases (AlN and Si) to form by reaction of the soft Al with Si 3 N 4 . The ceramic content of the final composites was higher than that of the original preform due to volume changes that occurred during the reaction heat treatment. Initial characterization of mechanical properties demonstrated that the composites had hardnesses, Young's moduli, and compresive strengths that compared favorably with traditionally processed AlN. Flexural strength measurements above the melting point of Si indicated that the composites possessed an interconnected skeleton of ceramic.