METHOD OF MAKING ELECTRIC HEATING ELEMENTS

摘要

An electric heating element is disclosed that is capable of cyclic operation at temperatures in excess of 2500 DEG F in an air atmosphere. The heating element consists essentially of molybdenum wire as a substrate and a relatively thin layer of molybdenum disilicide over the substrate. A process consisting of heating the coils in a non-oxidizing atmosphere with boron silicide, sodium fluoride and silicon produces the heating elements under controlled time and temperature conditions.