Building a Sintering Front through Fast Firing
Abstract: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.
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: November 1, 2011