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Synthesis and Sintering of Cordierite from Ultrafine Particles of Magnesium Hydroxide and Kaolinite
Author(s) -
Sumi Katsuhiro,
Kobayashi Yuichi,
Kato Etsuro
Publication year - 1998
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.1151-2916.1998.tb02442.x
Subject(s) - cordierite , kaolinite , materials science , sintering , amorphous solid , magnesium , hydroxide , ceramic , mineralogy , thermal decomposition , chemical engineering , metallurgy , inorganic chemistry , chemistry , crystallography , organic chemistry , engineering
Thermal reactions of magnesium compounds and kaolinite were investigated to obtain dense cordierite ceramics without additives. Magnesium hydroxide was precipitated from aqueous solution in the form of ultrafine hexagonal tabular particles of about 0.1 µm, and heating this mixture with kaolinite in a mole ratio of MgOAl 2 O 3 2SiO 2 resulted in formation of an amorphous state at about 900°C following thermal decomposition. µ‐Cordierite was then crystallized from the amorphous phase at about 950°C, and gradually transformed into alpha‐cordierite. Firing the pressed specimens yielded a dense alpha‐cordierite ceramic with a relative density of 97.7% at 1350°C.