Amorphous caesium aluminum fluoride complex, its production and use

摘要

The present invention provides an amorphous caesium aluminum fluoride complex, a process for its production and the use of the complex as a flux, in particular for the soft soldering of aluminum.

主权项

1. A process for the production of an amorphous CsAlF complex comprising:
a) forming a product by binding cesium fluoride dissolved in water to aluminum fluoride in solid form and adding an additive selected from the group consisting of CsHCO3, Cs2CO3, CsOH, dilute hydrofluoric acid and cesium bifluoride to adjust the amorphicity; wherein the reaction time is between 15 minutes and 6 hours; b) establishing a basicity or acidity in the product of a) through the addition of said additive, wherein the molar ratio of additive to AlF3 is between 0.0001:1 and 0.3:1; wherein during a) and b) the temperature is between 95 and 175° C., and the pressure is between 0.4 and 2.5 bar absolute; c) on completion of the reaction, evaporating the water present by applying a vacuum; wherein the pressure is reduced to between 10 and 100 mbar and the time for which the water is evaporated to obtain a solid is between 5 minutes and one hour; d) dewatering the solid obtained in c) at a temperature between 80 and 300° C. and a pressure between 10 and 900 mbar; wherein the amorphous CsAlF complex does not contain oxygen and CsF is not present in the amorphous CsAlF complex.