Patent ID: 6218648
Filing Date: 2001-04-17
Classification: H05B

Abstract:
A ceramic heater which comprisesan insulation sheet comprising 88 to 95 weight % of Al.sub.2 O.sub.3 supplemented with, as sintering aids, 3 to 10 weight % of SO.sub.2, 0.4 to 1.0 weight % of MgO and 1.0 to 2.5 weight % of CaO,a core covered with said insulation sheet,a resistance heating element of high-melting metal as interposed between said insulation sheet and said core,an intermediate layer of an alumina ceramic body having a thickness of 5 to 50 .mu.m, andsaid alumina ceramic body containing 0.05 to 4 weight % of SiO.sub.2, 0.01 to 0.5 weight % of MgO and 0.01 to 1.2 weight % of CaO as interposed between at least a part of said resistance heating element and said core and or between at least a part of said resistance heating element and said insulation sheet.