Patent ID: 6059900
Filing Date: 2000-05-09
Classification: B23K,C22C

Abstract:
A high lead solder composition for high temperature electrical applications consisting of:(a) about 0.0005-0.1 wt %, based on the total weight of said solder composition, of an alkali metal selected from the group consisting of Na, K and Li;(b) a grain-size controlling additive selected from the group consisting of Ce, Ba, Pr, Nd, Sm, La, Y, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb, Lu, Sc, Mg, Se, Te, oxides thereof and mixtures thereof, effective to control Pb grain size within the alloy to .ltoreq.300 .mu. after exposure for 200 hours at 200.degree. C.; and(c) the remainder being Pb.