Patent · US Expired

Low-melting potassium fluoroaluminate

US5985233A · kind A · utility

3Cited by

4References

5Claims

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	Oct 10, 1997
Grant date	Nov 16, 1999
Priority date	—
Expiry date	Oct 10, 2017

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.degree. C. under vacuum, the resulting potassium fluoroaluminate has a differential scanning calorimetry melting point of about 548.degree. C.

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