Ceramic heater, especially a sintered heater rod e.g. a heater plug, has interior insulation and exterior conductor layers formed from different starting compositions comprising silicon nitride, molybdenum disilicide, alumina and yttria

摘要

The invention relates to a sintered stick-shaped heater formed of a composite ceramic material structure. Said heater is essentially provided with an inner insulating layer (1) and an outer conductive layer (2). The insulating layer (1) can be produced with 51-57 % Si3N4 by mass, 37-42 % MoSi2 by mass, 2.4-2.8 % Al2O3 by mass and 3.2-3.6 % Y2O3 by mass and the conductive layer (2) can be produced with 38-42 % Si3N4 by mass, 53-58 % MoSi2 by mass, 1.8-2.0 % Al2O3 by mass and 2.4-2.7 % Y2O3 by mass.