Patent ID: 6463763
Filing Date: 2002-10-15
Classification: B01F,C03B

Abstract:
A stirrer apparatus for stirring a glass melt comprising:a stirring element comprising an impeller and a shaft element, both made of a refractory metal or a refractory metal alloy as a first metal; a drive shaft constructed of a second non-refractory metal or alloy, said shaft element and said drive shaft each having an end portion, the end portion of the shaft element being adapted to mechanically attach to the end portion of the drive shaft; and a casing made of platinum and disposed over at least one of the end portions of the shaft element and the drive shaft over a length suitable to isolate at least one of said end portions against corrosive attack from the glass melt within a range of surface levels of the glass melt, said casing not extending substantially above a maximum level of the glass melt and not extending substantially below a minimum level of the glass melt.