Patent · US Expired

Low-melting potassium fluoroaluminate

US6350424B1 · kind B1 · utility

1Cited by

5References

6Claims

0Family size

Assignee

SOLVAY FLUOR und DERIVATE GmbH · DE

Inventors

Heinz-Joachim Belt · Burgwedel, DE
Ruediger Sander · Sehnde, DE
Werner Rudolph · Hannover, DE

Key dates

Filing date	Aug 18, 1999
Grant date	Feb 26, 2002
Priority date	—
Expiry date	Aug 18, 2019

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K35/3605
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The production of a potassium fluoroaluminate having a low melting point, which can be used as a flux when soldering aluminum. The potassium fluoroaluminate is prepared in an aqueous medium from aluminum hydroxide, hydrogen fluoride and potassium hydroxide in a molar ratio of aluminum:fluorine:potassium of approximately 1:5:2. After drying at 80° C. under vacuum, the resulting potassium fluoroaluminate has a differential scanning calorimetry melting point of about 548° C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.