Pre-treated carbon based composite material for molten metal

Details Pre-treated carbon based composite material for molten metal Pre-treated carbon based composite material for molten metal

2000-01-21

2000-11-14

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

266235, 428408, 428469, 428472, 428701, 428702, B32B 1500, B22B 1800

Patent

active

061464430

ABSTRACT:
An improved shaft suitable for use in the treatment of molten aluminum including pumping or fluxing employing an impeller, comprised of a shaft material comprised of a carbon or graphite surface treated to provide a reacted surface and a refractory layer provided to cover the reacted surface of the shaft. The refractory layer is resistant to attack by the molten metal. The refractory layer and the carbon or graphite material have a coefficient of thermal expansion less than 5.times.10.sup.-6 in/in/.degree. F., the refractory layer has a ratio of coefficient of thermal expansion in the range of 5:1 to 1:5.

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