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Liquid Phase Sintering of Alumina, III. Effect of Trapped Gases in Pores on Densification
Author(s) -
Dong Weimin,
Jain Himanshu,
Harmer Martin P.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00149.x
Subject(s) - sintering , materials science , porosity , aluminosilicate , microstructure , calcium aluminosilicate , liquid phase , phase (matter) , porous glass , composite material , metallurgy , mineralogy , chemical engineering , catalysis , chemistry , physics , organic chemistry , thermodynamics , engineering , biochemistry
The microstructure evolution and densification kinetics of alumina containing 10 and 20 vol% calcium aluminosilicate glass were studied, for sintering under vacuum and air at 1600°C. Residual porosity was always present in the air‐fired samples. The kinetic analysis lent strong support to the notion that trapped gases inhibited the densification and limited the attainment of full density. The samples containing 20 vol% glass were able to reach full density during vacuum sintering. However, the samples containing 10 vol% glass contained some residual porosity even after vacuum sintering, which was attributed to the preferential volatalization of liquid phase.