EP 2889541 A1 20150701 - GLOW PLUG
Title (en)
GLOW PLUG
Title (de)
Glühkerze
Title (fr)
Bougie d'incandescence
Publication
Application
Priority
- JP 2013237001 A 20131115
- JP 2014180916 A 20140905
Abstract (en)
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.
IPC 8 full level
F23Q 7/00 (2006.01)
CPC (source: EP)
F23Q 7/001 (2013.01)
Citation (search report)
- [I] JP 2009156560 A 20090716 - NGK SPARK PLUG CO
- [A] JP 2009158431 A 20090716 - NGK SPARK PLUG CO
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 14191900 A 20141105