Vacuum high temp. electric heating pipe and product tech. thereof

A vacuum high temperature heater tube includes a refractory steel outer guard tube and a hot wire, in which, a mixed filling layer is set between the surrounding of the hot wire and the guard tube, a seal casing cap is set at the line end, an insulation porcelain base is set out of the seal casing cap, a screw cutting sleeve is set at the outer end of the insulation porcelain base and the back of the cutting sleeve is fixed to the outer wall of the guard tube. The production technology includes: cleaning the guard tube, drying, removing hydrogen, winding the carbon hot wire on a stainless steel rod in twist and putting it at the center of the guard tube, filling a matched MgO compound material uniformly and vibrating it to draw out the stainless steel rod steadily to be filled, shrinking the tube, heating it to 150deg.C for 1 hour to be vacuumed and removing moisture till 500Kohm insulation resistance, filling a seal casing cap, pressing tightly the insulation porcelain base with the screw cutting sleeve to be welded with the outer wall of the guard tube, shaping, testing and verifying and packing the product.