G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 1/067 (2006.01) G01N 15/02 (2006.01) G01N 15/12 (2006.01) G01N 27/00 (2006.01) G01N 33/20 (2006.01) G01N 15/00 (2006.01)
Patent
CA 2302121
The present invention relates to quality control of liquid metals and an apparatus for monitoring, on line, the flowing molten metal. It has long been a desirable goal to be able to measure the quality of liquid metals in terms of the numbers and sizes of inclusions within a melt. Since the 1960s, owing to the increasing use of foil and thin gauge products such as the aluminium beverage cans, aluminium companies such as Reynolds and Alcan had attempted to develop ultrasonic methods to detect inclusions in molten aluminium. These met with little success, Alcan's twenty years of effort being abandoned following the successful introduction of the LiMCA, trade-mark of Limca Research Inc., (Liquid Metal Cleanliness Analyser) method by Doutre and Guthrie. This technique relies on the Electric Sensing Zone Principle (ESZ), and was well known for aqueous systems, since the Coulter patents of 1954. The equivalent LiMCA method for liquid metals is also based on the ESZ principle, and is now in world-wide use in cast houses making critical quality alloys (AA3001, 3004) for the production of aluminium beverage cans, sheet and lithographic plates. The commercial equipment is manufactured under licence, by Bomem, Quebec City, and is able to monitor, on line, the quality (number and size distribution of inclusions) of molten aluminium flowing from the holding furnaces through a launder, into the moulds of a DC (Direct Chill) casting machine. See U. S. Patent 4,555,662, Doutre and Guthrie, issued November 26, 1985, and U. S. Patent 4,600,880, for instance. Several other patents have since been obtained by Alcan International.
Guthrie Roderick I.l.
Li Mei
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