Patent ID: 11905614
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A terminal material for a connector comprising:
a base material in which at least a surface is made of Cu or Cu alloy;
a Ni layer made of Ni or Ni alloy and formed on the base material;
a Cu—Sn intermetallic compound layer including Cu6Sn5 and formed on the Ni layer; and
an Sn layer made of Sn or Sn alloy and formed on the Cu—Sn intermetallic compound layer, wherein
a thickness of the Ni layer is 0.1 μm or more and 1.0 μm or less, a thickness of the Cu—Sn intermetallic compound layer is 0.2 μm or more and 2.5 μm or less, and a thickness of the Sn layer is 0.5 μm or more and 3.0 μm or less; and
an average crystal grain size Dc is 0.5 μm or more, and a grain size ratio Ds/Dc is five or less where an average crystal grain size of the Cu6Sn5 in the Cu—Sn intermetallic compound layer is Dc and an average crystal grain size of the Sn layer is Ds, when cross sections of the Cu—Sn intermetallic compound layer and the Sn layer are analyzed by the EBSD method with a measuring step 0.1 μm and a boundary in which misorientation between adjacent pixels is 2° or more is deemed to be a crystal boundary.