Influence of milling liquids and additives on particle size reduction and sintering behaviour of Al(sub 2)O(sub 3)
The grinding process reduces particle size, enhances sinter ability, and promotes the development of improved microstructure. A sol-gel derived alumina powder was wet milled at various solids loadings and the optimum loading (solids/water =1.0: 1.0) determined, with respect to particle size reductio...
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Veröffentlicht in: | British ceramic transactions 2002-10, Vol.101 (5), p.200-207. |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The grinding process reduces particle size, enhances sinter ability, and promotes the development of improved microstructure. A sol-gel derived alumina powder was wet milled at various solids loadings and the optimum loading (solids/water =1.0: 1.0) determined, with respect to particle size reduction and an optimised milling time of 6 h. The use of propanol, methanol, and ethanol as milling liquids improved the powder characteristics. Fine particle agglomeration was found to be reduced by the addition of milling additives (magnesium stearate, strontium stearate, and ammonium polyacrylate) at various concentrations. These additives were also found to modify grain growth. Moreover magnesium stearate reduced the grain growth considerably and uniform microstructure was observed. The presence of milling additives increases the fineness of the powder and the sintered density. It is concluded that the presence of milling additives results in adsorption of the long chain additive molecules over the particle surfaces, thus decreasing frictional and cohesive interactions between them, and thereby altering the flow properties of the mill content during grinding, which in turn enhances the overall grinding process. |
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ISSN: | 0967-9782 |
DOI: | 10.1179/096797802225003974 |