Patent ID: 8535581

Claim:
A method for making a liner for an induction furnace for melting metal where the metal does not connect inductively when the metal is in a solid state but does connect inductively when the metal is in a molten state, the method comprising: mixing graphite particles, silicon carbide particles and a carbon based binder to form a mixture; forming a green liner for an induction furnace from the mixture; heating the green liner to a temperature above about 1100° C. to cure and bake the green liner and make a liner; and adjusting the electrical conductivity of the liner by regulating the ratio of graphite particles and silicon carbide particles in the mixture so that the liner has a higher electrical conductivity than the electrical conductivity of the metal to be melted when the metal is in a solid state but lower than the electrical conductivity of the metal to be melted when the metal is in a molten state, wherein the forming of the green liner is conducted outside an inductive furnace.