PRODUCTION OF POTASSIUM FLUOROALUMINATE, POTASSIUM FLUOROALUMINATE AND FLUX SOLDERING ALUMINUM

PROBLEM TO BE SOLVED: To obtain the subject compd. having a lower m.p. than the conventional one by allowing Al(OH)3 , HF and KOH to undergo a reaction under specified conditions to deposit a potassium fluoroaluminate having a specified m.p. SOLUTION: Al(OH)3 , HF and KOH are allowed to react in a l...

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Bibliographische Detailangaben
Hauptverfasser:	RUDOLPH WERNER DR, SANDER RUEDIGER, BELT HEINZ-JOACHIM DR
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING INORGANIC CHEMISTRY MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain the subject compd. having a lower m.p. than the conventional one by allowing Al(OH)3 , HF and KOH to undergo a reaction under specified conditions to deposit a potassium fluoroaluminate having a specified m.p. SOLUTION: Al(OH)3 , HF and KOH are allowed to react in a liq. medium (e.g. water) in 1:5±0.2:2±0.05, preferably 1:5±0.1:2±0.05, molar ratio of Al:F:K preferably at 60 deg.C to the b.p. of the reaction mixture, the reaction product is dried at 80 deg.C in vacuum, and a potassium fluoroaluminate having 546-550 deg.C m.p. measured by DSC is deposited. The deposited potassium fluoroaluminate is separated from the liq. medium and dried. This potassium fluoroaluminate is excellently used as the flux in soldering Al because of its low m.p.