Patent ID: 6143055
Filing Date: 2000-11-07
Classification: B01F,C22B,C23C,F27D,Y02P,Y10T

Abstract:
An improved shaft suitable for use in the treatment of molten aluminum including pumping or fluxing employing an impeller, comprised of:(a) a shaft comprised of a carbon or graphite material having an exterior surface; and(b) a refractory layer comprised of consolidated particles to cover said exterior surface of said shaft, the refractory layer resistant to attack by said molten metal, said refractory layer and said carbon or graphite material having a coefficient of thermal expansion less than 5.times.10.sup.-6 in/in/.degree. F., said refractory layer and said carbon or graphite material having a ratio of coefficient of thermal expansion in the range of 5:1 to 1:5.