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- 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