| 摘要 |
<p>PURPOSE:To improve the reliability of sealing with glass, and to discriminate its polarity simply by mounting a metallic chromium layer to a wire, in which a copper coated layer is fitted to a Fe-Ni alloy conductor, and setting up a chromium oxide layer to the surface of the metallic chromium layer. CONSTITUTION:A copper coated layer 2 is mounted on a Fe-Ni alloy conductor 1, a chromium (Cr) layer 3 at a weight ratio of 10% or less is fitted outside the layer 2, and a chromium oxide layer 4 is formed on the surface through a surface treatment. When the chromium layer 3 is shaped in thickness at a weight ratio of 10% or more, an effect having the thermal expansion coefficient of a Dumet wire cannot be ignored because the thermal expansion coefficient of chromium is large, and there is poossibility in which cracks are generated in glass on sealing. Since the surface has the chromium oxide layer, it looks green, thus easily discriminating the titled Dumet wire from normal one with a cuprous oxide layer (red).</p> |
