Aluminium Powder Metallurgy in Perspective

Liddiard, P. D.

doi:10.1179/pom.1984.27.4.193

Cited by 9 publications

(2 citation statements)

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“…compaction by the application of mechanical force or hydrostatic pressure also represents an important and widely used processing method for many granular materials across various industrial sectors, including metals [Liddiard 1984, German 2005, Kim et al 2013 and ceramics [Rahman 2003, Pizette et al 2013. It would be interesting, therefore, to explore whether the SAXS method could also prove useful in studying the compaction behaviour of other materials.…”

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Using small-angle X-ray scattering to investigate the compaction behaviour of a granulated clay

Laity

Asare-Addo

Sweeney

et al. 2015

Applied Clay Science

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ABSTRACT:The compaction behaviour of a commercial granulated clay (magnesium aluminium smectite, gMgSm) was investigated using macroscopic pressure-density measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray microtomography (XµT) and small-angle X-ray scattering (SAXS). This material was studied as a potential compaction excipient for pharmaceutical tabletting, but also as a model system demonstrating the capabilities of SAXS for investigating compaction in other situations.Bulk compaction measurements showed that the gMgSm was more difficult to compact than polymeric pharmaceutical excipients such as spheronised microcrystalline cellulose (sMCC), corresponding to harder granules. Moreover, in spite of using lubrication (magnesium stearate) on the tooling surfaces, rather high ejection forces were observed, which may cause problems during commercial tabletting, requiring further amelioration. Although the compacted gMgSm specimens were more porous, however, they still exhibited acceptable cohesive strengths, comparable to sMCC. Hence, there may be scope for using granular clay as one component of a tabletting formulation.Following principles established in previous work, SAXS revealed information concerning the intragranular structure of the gMgSm and its response to compaction. The results showed that little compression of the intragranular morphology occurred below a relative density of 0·6, suggesting that granule rearrangements or fragmentation were the dominant mechanisms during this stage. By contrast, granule deformation became considerably more important at higher relative density, which also coincided with a significant increase in the cohesive strength of compacted specimens.Spatially-resolved SAXS data was also used to investigate local variations in compaction behaviour within specimens of different shape. The results revealed the expected patterns of density variations within flat-faced cylindrical specimens. Significant variations in density, the magnitude of compressive strain and principal strain direction were also revealed in the vicinity of a debossed feature (a diametral notch) and within biconvex specimens. The variations in compaction around the debossed notch, with a small region of high Clay compaction SAXS -revised PRL 2015-01-03

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mentioning

confidence: 99%

Using small-angle X-ray scattering to investigate the compaction behaviour of a granulated clay

Laity

Asare-Addo

Sweeney

et al. 2015

Applied Clay Science

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“…[1]. De la pendiente de la recta que se obtiene al representar InCA/Z/^) frente a 1/T, se calcula la energía de activación del proceso de sinterización E. [2] siendo:…”

Section: Procedimientounclassified

Obtención de polvo de aluminio por atomización

Krivij¹,

Suwardjo²,

Frades³

et al. 1996

REVMETAL

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Resumen En una planta piloto de pulvimetalurgia se obtiene polvo de aluminio destinado a la fabricación de piezas sinterizadas. Se determina la distribución granulométrica y se realizan la caracterización tecnológica y el estudio morfométrico del polvo de aluminio. Se estudia la sinterabilidad del polvo de aluminio mediante la sinterización isotérmica de las muestras prensadas a diferentes temperaturas y tiempos de retención.Palabras clave: Polvo de aluminio. Atomización. Pulvimetalurgia. Obtaining of aluminium powder by atomization AbstractIn a powder metallurgy pilot plant aluminium powder for the production of sinterized details has been obtained. The granulometric distribution, technological characterization and microstructure analysis of the aluminium powder has been studied by means of the isothermic sintering of the pressing samples to different temperatures and retention times.

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