(19)
(11) EP 2 608 629 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.09.2014 Bulletin 2014/38

(43) Date of publication A2:
26.06.2013 Bulletin 2013/26

(21) Application number: 12199164.0

(22) Date of filing: 21.12.2012
(51) International Patent Classification (IPC): 
H05B 3/14(2006.01)
(84) Designated Contracting States:
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 States:
BA ME

(30) Priority: 21.12.2011 JP 2011279122
17.09.2012 JP 2012203784

(71) Applicant: NGK Spark Plug Co., Ltd.
Nagoya-shi, Aichi 467-8525 (JP)

(72) Inventor:
  • Kan, Yohei
    Nagoya, Aichi 4678525 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Ceramic heater and manufacturing method therefor, and heating apparatus


(57) A ceramic heater having a substrate and a heat-generating element. The substrate is formed from an electrically insulating ceramic and extends rearward from the forward end of the ceramic heater in the direction of the axis. The heat-generating element has a heat-generating portion formed from an electrically conductive ceramic which contains silicon nitride and an electrically conductive material, disposed in a forward end portion of the substrate, and having a shape resembling the letter U as viewed along the direction of the axis. The heat-generating portion has a fracture toughness of 4.3 Mpa·m0.5 or more.







Search report


















Search report