Journal of Materials Science and Engineering with Advanced TechnologyAuthor's: Yexia Qin and Wei Pan
Pages: [11] - [25]
Received Date: April 4, 2010
Submitted by:
A family of alumina ceramic core composites sintered at 
and 
for 5h were in situ synthesized and
characterized to understand its complex behavior. The sintered product
exhibits a microstructure consisting of in situ synthesized 
phase throughout the predominant 
matrix. The ceramic cores of theoretical
20wt% in situ synthesized 
contents show excellent phase stability in
temperature regimes, where 
generally undergo severe phase decomposition.
Thermal expansion coefficients as low as 
(
to 
) were observed. The low thermal expansion is
attributed to a combination of the microcracking, the porosities, and
the phase stability. The ceramic cores of theoretical 20wt% in situ
synthesized contents sintered at for 5h have almost no creep deformation in
the present research. With proper processing, the composites represent
a low thermal expansion, high-temperature stability, and almost no
creep deformation makes them potential candidates for commercial
applications for investment casting.
ceramic core composites, property, investment casting, alumina-based, in situ synthesized.
