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Journal of Materials Science

, Volume 42, Issue 24, pp 10296–10298 | Cite as

Supercooling of metal in fine filters

  • Derya DispinarEmail author
  • John Campbell
Letter

A commercially available technique for assessing the quality of liquid aluminium alloys is the Prefil-Footprinter test in which a quantity of liquid metal is forced to pass through a fine filter. Normally the filtration rate is measured and compared with recorded information. A clean melt retains the open pore structure of the filter keeping its resistance to a minimum and achieving a high rate of filtration. In contrast, a low flow rate would indicate the build up of inclusions leading to partial choking of the filter [1]. The curve of filtrate weight versus time provides a measure of the relative cleanliness of an aluminium melt by comparison with a wide variety of benchmark results [2]. The filter and its deposit can be subsequently sectioned and the inclusions identified by metallographic techniques.

Some of the most important and common types of inclusions detectable by the test are those entrained from the surface as films, such as oxides. The entrainment mechanism is a folding...

Keywords

Rapid Freezing Good Metal Fine Filter Gravity Casting Liquid Aluminium Alloy 

References

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    Rochette P, Simard AA (2000) Cleanliness measurement using the Prefil-Footprinter instrument. Aluminium, 76(1/2): 20–26Google Scholar
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    Walker JL (1959) In: StPierre GR (ed) The physical chemistry of process metallurgy, Part 2. Interscience, New York, p 845; summary in B. Chalmers (1964) Principles of solidification. Wiley, New YorkGoogle Scholar
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    Liu RP, Herlach DM, Vandyoussefi M, Greer AL (2004) Metall Mater Trans 35A:607–612CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Materials and ChemistrySINTEFTrondheimNorway
  2. 2.The Department of Metallurgy and MaterialsThe University of BirminghamBirminghamUK

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