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Tape Casting, Pressureless Sintering, and Grain Growth in Ti 3 SiC 2 Compacts
Author(s) -
Murugaiah A.,
Souchet A.,
ElRaghy T.,
Radovic M.,
Sundberg Mats,
Barsoum M. W.
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.1551-2916.2004.00550.x
Subject(s) - materials science , grain growth , sintering , metallurgy , annealing (glass) , microstructure , grain boundary , grain boundary strengthening , grain size , titanium , composite material
In this work we demonstrate that fine Ti 3 SiC 2 powders can be tape‐cast and/or cold‐pressed and pressureless‐sintered in Ar‐ or Si‐rich atmospheres to produce fully dense, oriented microstructures in which the basal planes are parallel to the surfaces. Carbon‐ and/or Si‐rich environments suppress grain growth. In the case of the tape casting, the C‐residue from binder burnout results in small core grains relative to the surface grains that can grow significantly. When sintering in high Si activities, titanium silicide phases form at the grain boundaries that slow grain growth. Annealing the latter in Ar at 1600°C, for extended periods (30 h), rids the samples of these grain‐boundary phases, which in turn results in grain growth. The advantage of the latter process is that the final grain size distribution is more uniform from surface to bulk.