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Processing and Properties of Sol–Gel‐Derived Alumina/Silicon Carbide Nanocomposites
Author(s) -
Hareesh Unnikrishnan Nair Saraswathy,
Sternitzke Martin,
Janssen Rolf,
Claussen Nils,
Warrier Krishna Gopakumar
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.1551-2916.2004.01024.x
Subject(s) - boehmite , materials science , calcination , silicon carbide , sintering , sol gel , nanocomposite , chemical engineering , precipitation , composite material , aluminium , nanotechnology , catalysis , chemistry , biochemistry , physics , meteorology , engineering
Dense alumina/5 vol% SiC nanocomposites were prepared by sol–gel processing using nanosized (180 nm) precoated SiC powders and a commercial boehmite sol. The SiC powder was precoated with boehmite by a controlled heterogeneous precipitation from an aluminum nitrate solution. The coated SiC powder was then dispersed in a boehmite sol, gelled, calcined, and densified by gas pressure sintering under argon atmosphere at 7–8 MPa pressure. The dependence of the calcination conditions on densification, the effect of seeding on the microstructural development, as well as the mechanical behavior of the sintered specimens, are presented and discussed.