H - Electricity – 05 – B
Patent
H - Electricity
05
B
31/113
H05B 3/12 (2006.01) H01B 3/10 (2006.01) H05B 3/48 (2006.01)
Patent
CA 1093295
ABSTRACT OF THE DISCLOSURE: An electrical heating element composition comprises orystals of a fused magnesium oxide and 0.05 to 5% by weight, based on the amount of the fused magnesium oxide, of a granular magnesium additive composition having a mineralogical composition within the MgO-SiO2-A12O3 system. The additive composition con- sists essentially of amorphous phases and micro- to crypto- crystalline phases, the crystal sizes of the crystalline portions not exceeding 10 microns; the additive has excellent lubricating properties in respect of the magnesium oxide crystals and reacts therewith at 800° to l050° C with active conductivity centers at the surface of one or more adjacent magnesium oxide crystals. The electrical heating element composition of the invention exhibits a marked reduction in the electrical conductivity and is used as an electrical insulating material in tubular heating elements.
253997
Bockstiegel Gerd-Edzard
Neidhardt Manfred
Rehfeld Gerhard
Dynamit Nobel Aktiengesellschaft
Robic Robic & Associes/associates
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