Arc melting high-purity carbon electrode and application thereof

摘要

An arc melting high-purity carbon electrode is capable of forming stable arc at the time of arc discharge, and it is possible to produce a vitreous silica crucible with good properties, which does not cause local lack of the electrode and does not create black foreign materials or concave portions on the inner surface of the crucible. The arc melting high-purity carbon electrode is a carbon electrode used to heat and melt silica powder by arc discharge, in which the density of the carbon electrode is equal to or more than 1.60 g/cm3 and equal to or less than 1.80 g/cm3, and is formed of high-purity carbon particles having a diameter of 0.05 mm or less.