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US 4,376,245 AGranted
Electrical heating element
AssigneeBulten-Kanthal AB
InventorsNils Lindskog, Ingvar Oderstig, Lars Berg
Life of this patent
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Abstract
An electrical tubular element with an outer, metallic casing (1) surrounding a resistor element (2) of a Fe-Cr-Al alloy embedded in an insulating material (3), is given improved durability by adding to the resistor alloy Y, Hf, Sc or one or more lanthanides in an amount of 0.01-1 percent by weight.
Claims4
An electrical heating element having an improved durability at a high temperature comprising:
- (a) a resistor element in the form of an elongated wire of an alloy which is resistant to nitriding in an oxygen-deficient, nitrogen-containing atmosphere, said resistor element comprising 12-25 percent by weight Cr, 3-6 percent by weight Al, 0.01-1 percent by weight of at least one member of the group consisting of Y, Hf, Sc, and the lanthanides, a minor amount of at least one member selected from the group consisting of Si, Mn, and Co, and the balance Fe;
- (b) an insulating material comprising MgO in which said resistor element is embedded;
- and
- (c) an outer metallic casing surrounding said insulating material and said resistor element embedded therein.
1 more element
Dependencies are inferred from the claim text.