Patent ID: 9185812
Filing Date: 2015-11-10
Classification: B23K,H05K

Abstract:
1. A solder paste consisting of a Sn—Zn based lead-free solder alloy powder having a particle diameter of 20-40 μm, 0.01-2.0 mass percent of particles disposed on the surface of the solder alloy powder and having a particle diameter of 5-300 nm and each consisting of elemental Ag, Au, or Cu, and a flux mixed with the solder alloy powder and the particles, wherein the solder paste is prepared by mixing a dispersion of the particles in an alcoholic solvent, which solvent is incorporated into the flux by the mixing, with the solder alloy powder and the components of the flux prior to incorporation of the alcoholic solvent contained in the dispersion into the flux.