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Electrically Conductive In Situ Formed Nano‐Si 3 N 4 /SiC/TiC x N 1− x Ceramic Composite Consolidated by Pulse Electric Current Sintering (PECS)
Author(s) -
Duan RenGuan,
Garay Javier E.,
Kuntz Joshua D.,
Mukherjee Amiya K.
Publication year - 2005
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.1551-2916.2004.00044.x
Subject(s) - materials science , ceramic , nanocrystalline material , sintering , composite material , amorphous solid , composite number , fracture toughness , electrical resistivity and conductivity , nano , electrical conductor , ceramic matrix composite , nanotechnology , crystallography , engineering , electrical engineering , chemistry
Fully dense nano‐sized Si 3 N 4 /SiC/TiC x N 1− x conductive composites have been synthesized through the reactive‐consolidation of a powder mixture of amorphous polymer precursor‐derived silicon carbonitride and nanocrystalline TiO 2 by pulse electric current sintering. The nano‐Si 3 N 4 and SiC grains, with sizes ranging from 15 to 30 nm, form large aggregate regions up to 20 μm in size. The nano‐TiC 0.3 N 0.7 grains, ranging from 100 to 300 nm in size, form a connected matrix in which the micro‐sized Si 3 N 4 /SiC aggregate regions are distributed. The resultant ceramic composite possesses an excellent electrical conductivity, ∼3.40 × 10 4 (Ω·m) −1 . This ceramic also exhibits favorable mechanical properties, including ∼14 GPa hardness and 6.7 MPa·m 1/2 fracture toughness.