Document Type and Number:
Japanese Patent JPS4817150
Kind Code:
B1
Abstract:
The magnesia insulation of a conventional sheathed electrical resistance heating element includes lithium oxide up to 0.010 mole per cent in order to give the insulation a fraction of ionic conductivity to total conductivity no higher than 0.6 at 1000 DEG C. A comparison is made between insulation with and without lithium oxide, and characteristics are given for such specimens showing the variation of their fraction of ionic conductivity with temperature, Fig. 2 (not shown). Variation of the ionic conductivity and electronic conductivity of the insulation with temperature is also discussed.
More Like This:
Application Number:
JP8725969A
Publication Date:
May 26, 1973
Filing Date:
November 01, 1969
Export Citation:
International Classes:
E04G21/12; B21F31/00; B28B21/56; B28B23/02; C04B35/03; H05B3/18; H05B3/48