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The densification of powder mixtures containing soft and hard components under static and cyclic pressure
Journal article   Peer reviewed

The densification of powder mixtures containing soft and hard components under static and cyclic pressure

A Zavaliangos and A Laptev
Acta materialia, v 48(10), pp 2565-2570
2000
DOI: https://doi.org/10.1016/S1359-6454(00)00066-5
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Abstract

Composites Creep Powder consolidation Powder processing Pressure oscillation
The effect of pressure cycling on the densification and ejection of Pb–Al 2O 3 powder mixtures is investigated and compared to static loading. The volume fraction of Al 2O 3 is varied between 0 and 80%. The density of all mixtures increases with time under constant pressure even at room temperature. This mechanical behavior is the result of the creep of lead. This effect diminishes with increasing volume fraction of Al 2O 3. Pressure cycling does not have any influence on the final density of lead samples in the absence of Al 2O 3. The influence of cycling becomes, however, noticeable in the presence of Al 2O 3 in the mixture. In this case, the density and strength of specimens are higher than the corresponding ones obtained after static pressing for the same dwell time. This effect is enhanced with increasing Al 2O 3 percentage. A static pressure approximately 50–80% larger than the cyclic one is required to achieve the same density. Moreover, the strength of compacts with high Al 2O 3 content is substantially higher after cyclic pressing than under static pressing. The ejection force is higher after cyclic compaction at a given pressure level owing to the higher density achieved.

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17 citations in Web of Science
20 citations in Scopus

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#12 Responsible Consumption & Production

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Collaboration types
International collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
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