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Building a Sintering Front through Fast Firing

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High‐density alumina was produced by fast firing (5 min, temperatures ≤1550°C). Most of densification occurred under nonisothermal conditions. High densification rates observed are related to a change in the internal structure of the compact. The formation of a dense outer alumina layer controlled the heat flux to the interior of the compact, and increased the amount of energy available for sintering. Sintering in fast firing occurred as a densification front moving from the outer surface toward the sample center. As long as the rate of heat transfer is enough to sustain its advance, no differential densification occurs.
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Document Type: Research Article

Affiliations: 1: Group of Ceramic and Glass Materials (CERMAT), Department of Chemical Engineering (EQA) and Department of Mechanical Engineering (EMC), Federal University of Santa Catarina, 88040-900 Florianópolis, SC, Brazil 2: Institute of Advanced Ceramics, Hamburg University of Technology (TUHH), 21071 Hamburg, Germany

Publication date: 2011-11-01

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