Electric heating – Heating devices – With heating unit structure
Patent
1992-07-07
1993-08-03
Reynolds, Bruce A.
Electric heating
Heating devices
With heating unit structure
219544, 219553, 219270, H05B 302
Patent
active
052331660
ABSTRACT:
A ceramic heater comprising a ceramic sintered body of silicon nitride matrix and a heating resistor of an inorganic conductor embedded in the sintered body, characterized in that the ceramic sintered body of silicon nitride matrix comprises 8 to 19 weight % of a rare earth element when calculated by conversion in terms of the amount of oxide, 2 to 7 weight % of silicon oxide (SiO.sub.2) and 7 to 20 weight % of molybdenum silicide or titanium nitride, and that electrode clamps holding lead wires are brazed to the side surfaces of the ceramic heater respectively via metalized layers so that the heating resistor is electrically connected to the lead wires via the electrode clamps.
The ceramic heater of the present invention is free from breakage of the heating resistor, change in resistance and deterioration in the structure of the ceramic sintered body of silicon nitride matrix, is superior in oxidation resistance, durability and quick temperature rising characteristics, and can be used continuously for an extended period of time at high temperatures while maintaining the excellent strength of the ceramic sintered body of silicon nitride matrix.
REFERENCES:
patent: 4357526 (1982-11-01), Yamamoto
patent: 4376652 (1983-03-01), Buljan
patent: 4440707 (1984-04-01), Shimamori et al.
patent: 4746636 (1988-05-01), Yokoyama
patent: 4912305 (1990-03-01), Tatemasu et al.
Kobe Toshihiko
Maeda Masahito
Ohno Michio
Kyocera Corporation
Reynolds Bruce A.
Switzer Michael D.
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