Results
Title

Effect of pure-solvents without deflocculants for finer SiC particle dispersed MgO based composite.

Authors

Yong-Ho Choa; Noriko Bamba; Hiroyuki Hayashi; Hiroki Kondo; Tohru Sekino; Koichi Niihara

Abstract

The deagglomeration process and its effects on the microstructure have been investigated for fine MgO, SiC powders and SiC particle added MgO mixed powders which were ball-milled under both polar- and non-polar solvent without deflocculants. During the drying, exothermic reactions are observed at 300–450 °C in MgO and SiC powders ball-milled in alcohol. On the other hand, no chemical reaction could be observed for the powders ball-milled using acetone, and nn-hexane. The observed exothermic reactions, then, are believed to be due to the oxide and/or oxide layer-alcohol reaction product formed during milling. This mechano-chemical reaction directly affects to deagglomerate during the drying process after wet-milling. Among the alcohol media, the well-dispersibility and deagglomeration of SiC powders as well as MgO powders seem to be reached by n-butyl alcohol, considering the balance between the steric effects and the dielectric constant of alcohol. These dispersion characteristics also effect on the microstructure of SiC particle dispersed MgO based composites.

Subjects

SILICON carbide; FLOCCULANTS; MAGNESIUM oxide; AGGLOMERATION (Materials); METAL powders; COMPOSITE materials

Publication

Journal of Materials Science, 1999, Vol 34, Issue 15, p3789

ISSN

0022-2461

Publication type

Academic Journal

DOI

10.1023/A:1004696615409