| 摘要 |
<p>PURPOSE:To obtain a terminal electrode part whose cost is low, whose solderability is good, whose drop in a solderability due to oxidation on the surface of an element is small and whose relaxation effect of a thermal shock property to the element during a soldering operation is excellent by a method wherein a metal phase contained in the terminal electrode part is composed of a copper alloy containing at least one component out of a group composed of lead, tin and zinc. CONSTITUTION:A terminal electrode part which contains a metal phase and an inorganic glass phase is provided; the metal phase is composed of a copper alloy containing at least one component out of a group composed of lead, tin and zinc. A cross section of the terminal electrode part is constituted so as to have the following: an intermediate layer composed of a metal phase composed mainly of copper or nickel, a metal phase composed mainly of lead, zinc or tin and a mixed texture phase containing at least two kinds selected from a group composed of intermetallic compound layers of these or a solid solution alloy phase; and a surface layer whose content of lead, tin or zinc is more than the intermediate layer as an average composition. Thereby, it is possible to obtain the terminal electrode part whose cost is low, solderability is good, drop in a solderability due to oxidation on the surface of an element is small and relaxation effect of a thermal shock property to the element during a soldering operation is excellent.</p> |
