Sheath heater

Electric heating – Heating devices – With heating unit structure

Patent

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Details

219548, 219552, 338238, 338257, 428679, 428680, 174102R, H05B 344

Patent

active

042800463

ABSTRACT:
A sheath heater having a heating wire embedded in a ceramic insulator such that the thermal deformation of the heating wire is substantially prevented, wherein the heating wire is formed of a nichrome-based wire having an Al-rich surface layer so as to permit forming an oxidation-protective alumina layer on the surface of the nichrome-based wire.

REFERENCES:
patent: 1736745 (1929-11-01), Lohmann
patent: 2360267 (1944-10-01), Osterheld
patent: 2816200 (1957-12-01), Mudge
patent: 3121154 (1964-02-01), Menzies et al.
patent: 3244861 (1966-04-01), Colburn
patent: 3622755 (1971-11-01), Vedder
Yajima et al., Nihon Kinzoku Gakkai Shi, "Some Experiments on Improvement of Electrical Heat Resisting Wire by Al Diffusion", (Report 2), vol. 19, p. 369, (1980).
Gulbransen et al., J. Electrochemical Soc., "Oxidation Studies on the Nickel-Chromium and Nickel-Chromium-Aluminum Heater Alloys," vol. 106, p. 941, Nov. 1959.

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