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Phase‐Pure Mullite from Kaolinite
Author(s) -
Yamuna Ammini,
Devanarayanan Sankaranarayana,
Lalithambika Malathi
Publication year - 2002
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.1151-2916.2002.tb00289.x
Subject(s) - mullite , kaolinite , sintering , phase (matter) , materials science , mineralogy , chemical engineering , metallurgy , ceramic , chemistry , organic chemistry , engineering
Sintering of kaolinite in the presence of certain carbonate mineralizers, viz., CaCO 3 , Na 2 CO 3 , and K 2 CO 3 , has been conducted at 950°–1350°C. The influence of these mineralizers at the above temperatures is evaluated using XRD and SEM techniques. A comparative study of phase formation of the above compositions shows that the sodium‐ and calcium‐fluxed samples give rise to multiphase systems, while K 2 CO 3 ‐incorporated samples give phase‐pure mullite. The observation that kaolinite in the presence of K 2 CO 3 can act as a precursor material for phase‐pure mullite is of great industrial significance.