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Crystallization of Cordierite Glass Ceramics for Joining SiC: Must Phase Separation Via Spinodal Decomposition Precede Nucleation?

Published online by Cambridge University Press:  02 July 2020

Warren J. MoberlyChan ,
T. J. Perham  and
L. C. DeJonghe
Warren J. MoberlyChan
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, CA94720
T. J. Perham
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, CA94720
L. C. DeJonghe
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, CA94720
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The crystallization of glass ceramics provides processing advantages for difficult shapes. Machining and sintering are limited to produce complex parts; similarly (superplastic) forming is limited to special ceramics. In theory, however, a liquid (or glass) may be simply poured into any shape, and then crystallized (or partially crystallized) to provide a strong, tough ceramic. In this work, a thin layer of glass ceramic, cordierite (2MgO.2Al2O3.5SiO2), joins SiC [1]. Tailoring secondary phases and percent crystallization provide flexible control of the coefficient of thermal expansion to minimize strain mismatches between the joint components.

Three processing steps are involved in crystallization of glass ceramics: first a fast quench produces the initial glass; the second step is a lower temperature “nucleation” anneal, where phase separation and/or precursors and/or the final structure is nucleated and ideally as a fine dispersion; the third step is the higher temperature “crystallization” anneal, where renucleation and/or growth develops a homogeneous (ideally fine grained) final crystalline product [2, 3].

Type
Atomic Structure and Mechanisms at Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 631 - 632
Copyright
Copyright © Microscopy Society of America 1997

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References

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The authors gratefully acknowledge the NCEM staff. Support was by DOE #ACO3-76SF00098.Google Scholar