Role of Solute Segregation at Grain Boundaries During Final–Stage Sintering of Alumina
Authors:
- 1 July 1964
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 47 (7) , 332-338
Abstract
The addition of minor amounts of MgO or NiO to Al 2 O 3 inhibits grain growth during sintering and allows the sintering process to proceed to theoretical density by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries. The inhibition of grain growth is accomplished by the segregation of solute at the grain boundaries, causing a decrease in the grain–boundary mobility. The segregation of MgO or NiO at the grain boundaries can be inferred from the results of the microhardness studies presented and is substantiated by autoradiographic experiments and also by lattice parameter determinations as a function of grain size.Keywords
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