Platinum thermocouple wire
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United States of America Patent
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Oct 30, 2018
Grant Date -
Apr 13, 2017
app pub date -
Feb 6, 2015
filing date -
Apr 4, 2014
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Abstract
A platinum wire in which crystal grain growth is slowed in order to prevent damage caused by creep without dispersing a metal oxide, and occurrence of slip at crystal grain boundaries is slowed. A platinum thermocouple wire that is used in a negative electrode of a platinum-based thermocouple and has a nitrogen mass concentration of 10 to 100 ppm, and when structure observation of the cross section of the wire in a longitudinal direction is performed, a structure is observed in which there is a plurality of crystal grains, which have an aspect ratio {(length of major axis)/(length of minor axis perpendicular to major axis)} of 5 or more and elongate in the longitudinal direction of the wire, in a wire thickness direction.
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