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Binder Design for Fabricating Internal Crack-Free Injection-Molded Si3N4-Based Ceramics

Published online by Cambridge University Press:  25 February 2011

Sophia R. Su
Sophia R. Su*
Affiliation:
GTE Laboratories Incorporated 40 Sylvan Road Waltham, MA 02254, U.S.A.
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Abstract

Binder design is an important issue in ceramic injection molding technology. The binder decomposition mechanism, which involves thermodynamics, kinetics, as well as heat and mass transfer, controls the binder removal process. This process, in turn, is governed by the thermal and physical characteristics of the organic waxes used, and is the most critical step in injection molding ceramics. In this paper, we present the binder design philosophy and the method of binder selection. A systematic binder removal study focusing on heating rate, setter powder, and sublimable materials was carried out with the selected compositions. As a result of this study, we concluded that the fluid wicking controls the binder removal at the molten temperature of the binder, and the diffusion and permeation-controlled mechanism dominate at the decomposition temperature range of the binder. With the right binder selection, it is feasible to produce internal and external crack-free large cross-section injection-molded ceramic parts.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 249: Symposium Q – Synthesis and Processing of Ceramics: Scientific Issues , 1991 , 345
Copyright
Copyright © Materials Research Society 1992

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References

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