高電圧放電接合法で作製した極細熱電対の評価(<小特集>M&P2009機械材料・材料加工部門技術講演会)

概要

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Performance of six fine thermocouples of type-K, which were fabricated to weld a chromel wire and an alumel wire of 50μm by non-contact discharge welding method, was examined. The sizes of the hot junction were estimated from SEM images, and the response rates were measured by blowing hot air for a short period. The sizes of hot junctions ranging from 43 to 126μm can be controlled by the butt angle of two wires before the welding. The size tends to decrease with an increasing butt angle, and it was less than 100μm when the butt angle is larger than 100 degrees. The ratio of the size of hot junction to wire diameter is smaller than common thermocouples even if the butt angle is greater than 100 degrees. The response rate increases with a decrease in the size of the junction.
2010-06-25