Patent ID: 6146443
Filing Date: 2000-11-14
Classification: B01F,C22B,C23C,F27D,Y02P,Y10T

Abstract:
An improved shaft suitable for use in the treatment of molten aluminum, comprised of:(a) a shaft comprised of a carbon or graphite material, said shaft treated at a temperature of at least 1000.degree. F. for a time sufficient to provide a reacted surface thereon; and(b) a refractory layer comprised of consolidated particles applied to said reacted 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.