Volume no :2, Issue no: 1, July (2010)

A MODEL ALUMINA BASED INVESTMENT CASTING CERAMIC CORE BODY SYSTEM

Author's: Yexia Qin and Wei Pan
Pages: [11] - [25]
Received Date: April 4, 2010
Submitted by:

Abstract

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.

Keywords

ceramic core composites, property, investment casting, alumina-based, in situ synthesized.