Nihon Superior Sha Co.

Suita, Japan

Nihon Superior Sha Co.

Suita, Japan
SEARCH FILTERS
Time filter
Source Type

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.


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.


Patent
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.

Loading Nihon Superior Sha Co. collaborators
Loading Nihon Superior Sha Co. collaborators