Patent ID: 11931828
Assignee: ZHENGZHOU RESEARCH INSTITUTE OF MECHANICAL ENGINEERING CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 4:
5. A preparation method of the copper-phosphorus-tin brazing wire according to claim 1, comprising following steps:
(a) taking a Cu wire, and calculating a mass of Cu, the Cu-14P alloy and Sn, and a required thickness of a Cu-14P layer and an Sn layer according to a mass of the Cu wire and a mass ratio of Cu, P, and Sn elements in the brazing wire;
(b) heating and smelting the Cu-14P alloy into a Cu-14P alloy liquid;
(c) heating and smelting Sn into a Sn metal liquid;
(d) making the Cu wire of the step (a) pass through the Cu-14P alloy liquid at a first speed, and then pass through the Sn metal liquid at a second speed; and
(e) making the brazing wire coming out from the Sn metal liquid pass through a shaping die and wound up to obtain the copper-phosphorus-tin brazing wire.