A homogeneous and stable amorphous-type cordierite (2MgO·2Al 2O 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.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of the American Ceramic Society|
|State||Published - Oct 1 1998|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry