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US 2019/0099845 A1Published application
Low melting point potassium aluminum fluoride flux agent
AssigneeHoneywell International Inc.
InventorsElisabeth Memmel, Jessica Maurer, Christian N. Werner, Anja Nieland
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Abstract
The present disclosure provides a potassium aluminum fluoride (KAlF4) flux agent having improved properties such as a lower melting point which allows for the use of solders and alloys with lower melting points. The potassium aluminum fluoride (KAlF4) flux agent may also allow for faster brazing of standard alloys.
Claims15
A KAlF4 flux agent comprising:
- a K:Al ratio between 1.3:1 and 1.5:1;
- a K:F ratio between 1.3:4 and 1.5:4;
- and
- a melting point between 530° C. and about 550° C.
1 more element
A KAlF4 flux agent, comprising:
- a K:Al ratio between 1.3:1 and 1.5:1;
- a K:F ratio between 1.3:4 and 1.5:4;
- a Al:F ratio of 1:4;
- and
- a phase composition of KAlF4 between about 5 wt. % and about 60 wt. % and of K2AlF5(H2O) between 40 wt. % and 95 wt. %, based on the total composition of the KAlF4 and K2AlF5(H2O) phases in the flux agent.
2 more elements
A method of producing a flux agent, comprising:
- providing a reaction vessel containing water;
- adding aluminum oxide to the reaction vessel under agitation;
- adding an aqueous hydrofluoric acid to form a reaction mixture, the aqueous hydrofluoric acid having a concentration between 50 wt. % and 75 wt. %;
- adding an aqueous potassium hydroxide to the reaction mixture, wherein the aqueous potassium hydroxide has a concentration between 45 wt. % and 55 wt. %;
- and
- cooling the reaction mixture to between 35° C. and 45° C.;
- and
- spray drying the reaction mixture to produce the flux agent, wherein the flux agent has a K:Al ratio between 1.3:1 and 1.5:1.
5 more elements
Dependencies are inferred from the claim text.