초록 ▼

This ceramic heater is increased in bulk density and decreased in production cost by using an unsintered composite as an unsintered filling member filled in a protective pipe without application thereto of a filling pressure while preventing a heating element from deteriorating. In this ceramic heat

This ceramic heater is increased in bulk density and decreased in production cost by using an unsintered composite as an unsintered filling member filled in a protective pipe without application thereto of a filling pressure while preventing a heating element from deteriorating. In this ceramic heater, the heating element capable of heating by flowing electricity therethrough is disposed in the protective pipe, which is filled with the unsintered composite. In the unsintered composite, inorganic compound particles are disposed between insulating ceramic particles. In this ceramic heater, the heating element is fixed to the inner wall surface of the protective pipe with a heat-resistant glass layer. The heat-resistant glass layer is partially penetrated into the unsintered composite. The open end portion of the protective pipe is hermetically sealed with a heat-resistant sealing member while allowing extension of lead wires from the end portion of the protective pipe.

대표청구항 ▼

[ What is claimed is:] [1.] A ceramic heater comprising a protective pipe constituted of a dense ceramic and having one end closed and the other end open; a heating element having the capability of heating by flowing electricity therethrough, disposed in said protective pipe and connected to lead wi

[ What is claimed is:] [1.] A ceramic heater comprising a protective pipe constituted of a dense ceramic and having one end closed and the other end open; a heating element having the capability of heating by flowing electricity therethrough, disposed in said protective pipe and connected to lead wires; an unsintered composite constituted of a mixture of ceramic particles and inorganic compound particles filled in said protective pipe such that said inorganic compound particles and said ceramic particles are mixed together; and a heat-resistant sealing member hermetically sealing an open end portion of said protective pipe while allowing extension of said lead wires out of an end portion of said protective pipe.