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Crystallization and Densification of Nano‐Size Amorphous Cordierite Powder Prepared by a PVA Solution‐Polymerization Route
Author(s) -
Lee SangJin,
Kriven Waltraud M.
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.tb02667.x
Subject(s) - cordierite , materials science , calcination , amorphous solid , chemical engineering , crystallization , microstructure , vinyl alcohol , specific surface area , polymerization , mineralogy , composite material , polymer , catalysis , chemistry , crystallography , organic chemistry , ceramic , engineering
A homogeneous and stable amorphous‐type cordierite (2MgO2Al 2 O 3 5SiO 2 ) powder was prepared by a solution‐polymerization route employing a Pechini resin or a poly(vinyl alcohol) (PVA) solution as the polymeric carrier. After calcination at 800°C for 1 h under atmospheric conditions, the bulky precursor changed into a very soft and porous powder. A 30 nm size, amorphous‐type cordierite powder was prepared by attrition milling the calcined powder, which was made using a PVA precursor solution. The nano‐size powder, which had a high specific surface area of 181 m 2 /g, was obtained after milling for <1 h. The sintered cordierite grains did not show the presence of any amorphous SiO 2 phase and had a dense microstructure with a relative density of 99% and a thermal expansion coefficient of 2.1 10 ‐6 /°C.