CERAMIC HEATER AND GLOW PLUG

PROBLEM TO BE SOLVED: To provide a ceramic heater for suppressing specific resistance of a heating resistor while securing strength and inhibiting cracks from being generated in the heating resistor.SOLUTION: A ceramic heater includes: a base material made of insulating ceramics; and a heating resis...

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Bibliographic Details
Main Author IHARA AKIO
Format Patent
LanguageEnglish
Japanese
Published 05.01.2017
Subjects
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
EXTINGUISHING-DEVICES
HEATING
IGNITION
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a ceramic heater for suppressing specific resistance of a heating resistor while securing strength and inhibiting cracks from being generated in the heating resistor.SOLUTION: A ceramic heater includes: a base material made of insulating ceramics; and a heating resistor which is formed in the base material and contains tungsten carbide (WC) and silicon nitride (SiN). In an arbitrary cross-section of a heating resistor 20, the ratio of an area of a tungsten carbide portion to the whole area is 33 to 67% and an average diameter of tungsten carbide aggregate measured by a line intercept method is 1.4 to 7.0 μm.SELECTED DRAWING: Figure 4 【課題】強度を確保しつつ発熱抵抗体の比抵抗を抑える共に、発熱抵抗体におけるクラック発生を抑えセラミックヒータを提供する。【解決手段】セラミックヒータは、絶縁性セラミックからなる基体と、基体内に形成されて炭化タングステン（ＷＣ）および窒化珪素（Ｓｉ３Ｎ４）を含有する発熱抵抗体と、を備える。発熱抵抗体２０の任意の断面において、全面積に対する炭化タングステン部分の面積の割合が３３〜６７％であり、ラインインターセプト法により計測した炭化タングステン凝集体の平均径が、１．４〜７．０μｍである。【選択図】図４
Bibliography:Application Number: JP20150121117