Shah, Sandeep R. ; Chokshi, Atul H. ; Raj, Rishi (2008) Porous Al2O3 - spinel based polycrystals that resist free-sintering Journal of the American Ceramic Society, 91 (10). pp. 3451-3454. ISSN 0002-7820
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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1551-...
Related URL: http://dx.doi.org/10.1111/j.1551-2916.2008.02622.x
Abstract
We show that increasing MgO content in Al2O3 from 0.25 to 10 wt% has a remarkable effect on the sintering behavior. While 0.25 wt% specimens sinter to near full density, the higher weight percent sample could be sintered to a maximum of 92% relative density even when held for 24 h at 1673 κ . The resistance of the pores to sintering is ascribed to a reduction in the driving force for sintering (rather than to kinetics). The volume fraction of the pores increases with the fraction of the spinel phase, which forms by a reaction between magnesia and alumina. These findings raise the promise of membranes that can be tailored for pore size and pore volume, for high temperature applications.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| ID Code: | 84178 |
| Deposited On: | 24 Feb 2012 11:29 |
| Last Modified: | 24 Feb 2012 11:29 |
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