Patent ID: 9073153
Filing Date: 2015-07-07
Classification: B23K,B32B,H05K,Y10T

Abstract:
1. A solder material comprising: a solder/flux mixture of solder particles dispersed in a flux, wherein the solder/flux mixture is a solid at room temperature; solder particles are made of a lead-free soldering alloy, wherein the lead-free soldering alloy is a tin-silver-copper alloy; the flux comprises a primary solids constituent present in an amount greater than about 50 wt. % and one or more secondary constituents selected from solvents, thickeners, and metal oxide reducing agents, wherein the flux includes a polyglycol; the flux has a temperature profile in which the flux is in a non-flowable inactive state at temperatures at and below a maximum storage temperature, a liquid active state at an activation temperature, and a flowable inactive state in a deposition temperature range above the maximum storage temperature and below the activation temperature, the maximum storage temperature being above about 27° C.; and the solder particles are in a liquid state at or above the activation temperature.