Electric heating – Heating devices – With heating unit structure
Reexamination Certificate
1999-11-16
2001-08-14
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
With heating unit structure
C219S553000, C219S505000, C029S611000
Reexamination Certificate
active
06274855
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heating resistor for ceramic heaters, ceramic heaters and a method of manufacturing ceramic heaters, and particularly to a heating resistor for ceramic heaters used for heating glow plugs of a diesel engine or others, ceramic heaters employing the same, and a method of manufacturing the ceramic heaters.
2. Description of the Related Art
There have conventionally been known instruments which employ heating resistors for ceramic heaters provided with various kinds of rising temperature properties (e.g., resistance temperature coefficient) used at high temperatures of 1000° C. or more such as glow plugs, including metals of W, Mo, Ti, Zr and Hf, or their carbides, nitrides and suicides.
However, recently in response to applications, rapidly heightening temperature properties or heating properties at constant temperatures are required, and many applications do not meet the heightening temperature requirements. Since heightening temperature properties are decided by the heating resistor, it was very often difficult to manufacture ceramic heaters having optional heightening temperature properties. In addition, these resistant materials were, when baking, insufficient in sintering, and caused exceptional grain growth and thereby decreased strength.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a heating resistor for ceramic heaters capable of optionally adjusting the resistance temperature coefficient of the heating resistor and having excellent anti-bending strength and electric conductive durability, as well as a ceramic heater employing the heating resistor, and a method of manufacturing the ceramic heater.
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Tatematsu Kazuho
Watanabe Shindo
Hoang Tu Ba
Morgan & Lewis & Bockius, LLP
NGK Spark Plug Co. Ltd.
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