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Building a Sintering Front through Fast Firing
Author(s) -
García Daniel E.,
Hotza Dachamir,
Janssen Rolf
Publication year - 2011
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2011.02609.x
Subject(s) - materials science , sintering , composite material , front (military) , layer (electronics) , heat transfer , flux (metallurgy) , metallurgy , mechanics , mechanical engineering , physics , engineering
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.