Method for producing a glow plug

Details Method for producing a glow plug Method for producing a glow plug

2006-04-04

2006-04-04

Tugbang, A. Dexter (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S03300H, C029S611000, C029S619000, C029S860000, C123S1690PB, C219S267000, C219S270000

Reexamination Certificate

active

07020952

ABSTRACT:
A green ceramic heater including a green heating resistor formed of an electrically conductive ceramic (e.g., silicide or carbide of a metal element such as W, Ta, or Nb) and an insulative ceramic (e.g., silicon nitride) and power supply leads (e.g., made of W), a first end of each power supply lead being connected to a corresponding end of the green heating resistor, the green heating resistor and the power supply leads buried in a green substrate formed of a material (e.g., silicon nitride) is fired, and subsequently, the resultant ceramic heater is heat-treated at 900 to 1,600° C., to thereby enhance flexural strength of the ceramic heater. The heat treatment is preferably carried out prior to forming a glass layer on an outer circumferential surface of the ceramic heater. When the heat treatment is performed after the fired ceramic heater has been polished so as to expose a second end of each power supply lead from a surface of the substrate, the heat treatment is preferably carried out in an inert atmosphere.

REFERENCES:
patent: 5750958 (1998-05-01), Okuda et al.
patent: 06-051068 (1995-05-01), None

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