1548 極細熱電対の試作(S14 溶接・接合の動向とその展開,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

抄録

We have developed a microwelding technique using micro electric discharge, and reported that gold particles of 60-80μm in diameter can be welded to a gold substrate. Here, two thin wires, an alumel wire and a chromel wire, were welded to make fine thermocouple by the above microwelding method. The two wires were fixed to cross their tips. A Tungsten needle was placed about 200μm above the cross, and 2kV or more was applied to the needle. The cross was melted and a junction was formed by the electric discharge. The size of the junction is less than 2 times of the wire diameter, while that of common thermocouple is more than 3 times of the wires diameter. Output of the thermocouple fabricated is almost the same with that of thermocouples on the market up to 650℃.