Nihon Superior Sha Co. | Date: 2010-10-27
A method by which the amount of nickel contained in an alloy having a composition represented by Sn-X-Ni can be regulated. The method of nickel concentration regulation comprises adding phosphorus to Sn-X-Ni in a molten state (wherein X is one or more elements selected from the group consisting of Ag, Zn, Cu, Bi, Au, Ti, Ge, Ga, Si, and Ce), holding the mixture at 250-400C, and removing the resultant dross floating on the surface of the liquid phase and containing a P-Ni compound and a P-Sn-Ni compound. An example of X is copper, and the content thereof may be 0.3-5 wt%. The phosphorus may be added in the state of a Sn-P alloy. The upper limit of the amount of the phosphorus to be added may be about half the nickel amount in terms of atomic amount.
Nihon Superior Sha Co. | Date: 2011-10-19
The purpose of the present invention is to provide equipment for separating excess copper dissolved in a lead-free solder bath and recovering purified tin with high efficiency. An element X for forming a (CuX)_(6)Sn_(5) compound between copper and tin in molten lead-free solders is added in an precipitation container to separate out a (CuX)_(6)Sn_(5) compound. Tin is recovered by binding the (CuX)_(6)Sn_(5) compound by passing thereof through a multi-perforated plate in a granulation container, further generating swirling currents to precipitate and separate the bound (CuX)_(6)Sn_(5) compounds in a separation container and removing thereof.
Nihon Superior Sha Co. | Date: 2010-08-18
A solder joint manufactured of an alloy essentially composed of 0.01-7.6 wt% Cu, 0.001-6 wt% Ni, and the remaining of Sn. Each of Cu and Ni has a maximum concentration range. The lower limit of the range of Ni is 0.01 wt% and preferably 0.03 wt%. The upper limit of the range of Ni is 0.3 wt% and preferably 0.1 wt%. The lower limit of the range of Cu is 0.1 wt% and preferably 0.2 wt%. The upper limit of the range of Cu is 7 wt% and preferably 0.92 wt%. The invention includes the solder joint essentially having these compositions.