abstract |
The present invention provides a molten metalntemperature measuring ceramic thermocouple that has anlong life, improves temperature measurementnresponsiveness and measuring accuracy and enablesnrepetitive use. In this molten metal temperaturenmeasuring ceramic thermocouple, a pair of tungstenrheniumnalloy strands(6,7,26,27,46,47) of dissimilarncompositions are installed in the protecting tube(2,21,n41) of ceramics such as silicon nitride, and the outernprotecting tube(1,22,42,44) made of cermet having Mo asna base is arranged on the outer side of the protectingntube(2,21,41). The interiors of the protecting tube(2,n21,41) and the outer protecting tube(1,22,42,44) arenfilled with the filler members(3,4,23,43) havingnsilicon nitride as a main component with the strands(6,n7,26,27,46,47) embedded therein. The end portion ofnthe protecting tube(2,21,41) is fitted with the sealingnmembers(8,9,10,28,48) comprising heat resisting membersnand heat resisting glass members. |