The invention belongs to the technical field of
electric heating tube manufacture, and relates to an
electric heating tube using
hexagonal boron nitride or mixture of
hexagonal boron nitride and
magnesium oxide as a
heat conducting material, in particular to a mixed
heat conducting material for a novel
electric heating tube. A main body structure comprises a
metal tube body, a mixed filler, a
resistance wire and accessories comprising a fixed plate, porcelain beads,
sealant, a plastic plug, a leading-out bar, a terminal electrodes and screws; a cavity structure of the
metal tube body is invariantly bent into a circular, elliptical or spiral geometric structure; parallel structures at two end sections of the
metal tube body are fixed on the fixed plate in an interval penetration mode, and fixed screws are arranged at two ends of the fixed plate; and the
resistance wire is fixed and electrically connected on the central axis of the cavity of the metal tube body and parallel to two end points on two sides of the tube wall, and the mixed filler is filled between the
resistance wire and the side wall of the metal tube body. The electric heating tube has the advantages of high stability and
heat conducting efficiency, high-temperature
softening prevention in
inert gas, long service life, high quality, good insulating property, low
dielectric constant and
dielectric loss, and safe use.