Patent ID: 8855168

Claim:
A method of forming an electric channel inductor assembly comprising the steps of: forming an outer shell of the a electric channel inductor assembly; locating one or more bushings in the electric channel inductor assembly; locating a hollow, substantially nonmagnetic, channel mold conformed to a shape of one or more flow channels between the interior wall of the outer shell and exterior surfaces of the one or more bushings, the exterior walls of the channel mold spaced apart from the interior wall of the outer shell and the exterior surfaces of the one or more bushings to form a refractory volume; installing refractory in the refractory volume; circulating a heated fluid medium through the hollow channel mold to heat the walls of the channel mold whereby the refractory adjacent to the outer surfaces of the hollow channel mold is subjected to a heat treatment to form a sealed refractory wall; and supplying a liquid to the hollow interior of the channel mold to chemically dissolve the hollow channel mold in the liquid.