Production of Rapid Quenched Copper-Based Solder Using the Melt-Extraction Technique

One of the ways to improve the properties of high-temperature solders consists in their achieving an amorphous and crystalline state by rapid quenching from the melted state. To produce wire and bars with a section up to 2 mm, extraction of the melt is proposed. A theoretical solution to the problem of solidification of the melt on the rotating crystallizer is proposed, taking into account the principal technological characteristics of the process: the speed of rotation of the drum, the material of which it is made, the temperature of superheating of the melt, and the depth of immersion of the drum into the melt. The melt is permitted to arrive from the bottom and there is a laminar flow of the liquid along the surface of the crystallizer. The Cu-based high-temperature solders are used as alternatives to Ag-based solders to solder Cu and its alloys, steel or both together. The rapid quenching of high-temperature solders on the basis of the 90Cu--6P--4Sn and 55Cu--40Zn--5Sn systems allows good quality wire to be produced with sufficient productivity with high plasticity to exchange the solders of Ag in automatic ways of brazing, brazing of items with reduced dimensions and with thin walls, in brazing in ovens and in brazing with an rf current. Graphs. 2 ref.--AA