Glühkerze

Details

Veröffentlichungs-Nr.

EP2889541

Aktenzeichen

EP14191900

Anmeldetag

5. November 2014

Veröffentlichung

23. Mai 2018

Erteilung

23. Mai 2018

Rechtsraum

EP

IPC

F23Q7/00

Abstract

A glow plug (10) comprising: a heat-generating element (820) formed of an iron-based alloy; a sheath tube (810) formed of a nickel-based alloy, disposed around the heat-generating element (820) and extending in an axial line (O) direction; a fusion zone (850) formed through welding of the sheath tube (810) and the heat-generating element (820), and closing a forward end of the sheath tube (810), wherein in a cross section including the axial line (O), the fusion zone (850) has an iron content of 20 mass% to 60 mass% at a measurement point of maximum iron content in a region having a depth of 0.5 mm or less from an outer surface of the fusion zone (850). The measurement point is determined through EPMA analysis (WDS: wavelength-dispersive X-ray spectrometer) of the region at an acceleration voltage of 20 kV, a probe current of 2.5 x 10-8 A, a beam irradiation diameter of 10 µm, and a measurement interval of 10 µm.

Anmelder

Firma

NGK Spark Plug Co., Ltd.

Land

🇯🇵 Japan

Fachgebiete