6 The sponge electrode is then placed inside a vacuum arc furnace for melting. On this water-cooled, copper container, an electric arc is used to melt the sponge electrode to kind an ingot. The significant sublimation temperature of SiC (approximately 2,700 °C) makes it helpful for bearings and furnace elements. https://jeffreylmkig.wikicorrespondence.com/5076440/rumored_buzz_on_chemical_formula_for_lithium_and_sulfur