Low-temperature welding material

Abstract

A low-temp solder for soldering electric capacitors contains Sn (60-64 wt.%), Zn (35.891-39.891 wt.%) and the Cu, Pb, Fe, Sb, As, Al, Bi, Ni and Cd (rest). Its advantages are low smelting temp, no damage to polypropene film, and high adhesion to Al foil.

Description

technical field

[0001] The invention relates to a solder, in particular to a low-temperature solder. Background technique

[0002] At present, the components of the capacitor are in the form of protruding pole plates, using aluminum foil as the pole plate and polypropylene film as the medium. The lead-out of the pole plate is welded by a rotary soldering iron welding process. The ordinary zinc-tin alloy is used, its melting temperature is between 280 and 330°C, and the polypropylene film will be melted during welding, and the combination rate with the aluminum foil is only 70%, which affects the quality of the capacitor, and the loss tangent of the capacitor is 0.04%. . Capacitors have poor tolerance to inrush and harmonic currents. Contents of the invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a low-temperature solder that does not damage the polypropylene film during welding, has a high bonding rate w...