Electric heating – Heating devices – With heating unit structure
Patent
1992-02-07
1993-11-23
Reynolds, Bruce A.
Electric heating
Heating devices
With heating unit structure
219553, 219270, H05B 344, H05B 350, H05B 310
Patent
active
052646815
ABSTRACT:
The invention relates to a ceramic heater for use, e.g., as a glow plug for a diesel engine or as an igniter for an oil or gas burner. The ceramic heater has a nonoxide ceramic body having a heating part and a supporting part and a heating resistor embedded in the heating part of the ceramic body. The material of the heating resistor is W, WC, tungsten alloy or a metal nitride such as TiN or TaN. According to the invention the heating part of the ceramic body is formed of aluminum nitride ceramic, which is high in heat conductivity and resistant to oxidation at high temperatures, at least in a core region in contact with the heating resistor, and the supporting part is formed of silicon nitride ceramic which is low in heat conductivity at least in a surface region. The ceramic body is made by uniting a heating part entirely formed of aluminum nitride ceramic and a supporting part entirely formed of silicon nitride ceramic with interposal of a joint part which is formed of mixed ceramic of aluminum nitride and silicon nitride with a gradient of the proportion of aluminum nitride to silicon nitride, or by thoroughly covering a core formed of aluminum nitride ceramic with silicon nitride ceramic.
REFERENCES:
patent: 4786781 (1988-11-01), Nozaki et al.
patent: 4804823 (1989-02-01), Okuda et al.
patent: 4912305 (1990-03-01), Tatemasu et al.
patent: 4963717 (1990-10-01), Woelfle
Horiki Kiminori
Iwai Masakazu
Nozaki Shunkichi
Suzuki Yasuhiko
Tatematsu Kazuho
NGK Spark Plug Co. Ltd.
Reynolds Bruce A.
Switzer Michael D.
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