Patent ID: 6102565
Filing Date: 2000-08-15
Classification: G01K

Abstract:
A ceramic sheath type thermocouple comprising:a protective tube made of a ceramics selected from silicon nitride, SiAlON and silicon carbide and having an end face of a front end portion thereof closed, the front end portion constituting a temperature measuring portion;a pair of W--Re wires of different compositions installed inside the protective tube and connected together in a region of the front end portion of the protective tube;a first filler filled into the front end portion of the protective tube to enclose the W--Re wires, said first filler being made mainly of a reaction-sintered Si.sub.3 N.sub.4 ceramic and particles selected from the group consisting of AlN, SiC, and Si.sub.3 N.sub.4 ; anda second filler filled into the protective tube other than the front end portion, said second filler being made of a material having a heat conductivity smaller than that of the first filler.