Flux used for brazing aluminum-based alloy
AssigneeCalsonic Corporation
InventorTatuya Fujiyoshi
Life of this patent
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Abstract
Fluxes for use in brazing aluminum-based alloy pieces are disclosed. One is a flux which comprises 70 to 90% wt % K.sub.2 SiF.sub.6 and 30 to 10 wt % AlF.sub.3. The other is a flux which comprises 98.5 to 94 wt % base composition which includes K.sub.2 SiF.sub.6 whose amount is 70 to 90 wt % of the base composition and AlF.sub.3 whose amount is 30 to 10 wt % of the base composition; 0.5 to 3 wt % LiF; and 1 to 3 wt % NaF. In order to facilitate the application of the flux to the pieces to be brazed, polybutene is used as a dispersing agent.
Claims9
A flux for use in brazing aluminum-based alloy pieces, comprising:
- 70 to 90 wt % K.sub.2 SIf.sub.6 ;
- and
- 30 to 10 wt % AlF.sub.3.
A flux for use in brazing aluminum-based alloy pieces, comprising:
- 98.5 to 94 wt % base composition, said base composition including K.sub.2 SiF.sub.6 whose amount is 70 to 90 wt % of the base composition and AlF.sub.3 whose amount is 30 to 10 wt % of the base composition;
- 0.5 to 3 wt % LiF;
- and
- 1 to 3 wt % NaF.
A method of brazing aluminum-based alloy pieces, comprising by steps:
- (a) preparing a flux which comprises 70 to 90 wt % K.sub.2 SiF.sub.6 and 30 to 10 wt % AlF.sub.3 ;
- (b) uniformly dispersing said flux in a polybutene to provide a suspension, said polybutene being a copolymer containing isobutylene as a major part and having at its terminal end a double bond and represented by the following formula:
- ##STR3## (c) applying said suspension to portions which are to be brazed and brazing said pieces.
A method of brazing aluminum-based alloy pieces, comprising by steps:
- (a) preparing a flux which comprises 98.5 to 94 wt % base composition, said base composition including K.sub.2 SiF.sub.6 whose amount is 70 to 90 wt % of the base composition and AlF.sub.3 whose amount is 30 to 10 wt % of the base composition;
- 0.5 to 3 wt % LiF;
- and 1 to 3 wt % NaF;
- (b) uniformly dispersing said flux in a polybutene to provide a suspension, said polybutene being a copolymer containing isobutylene as a major part and having at its terminal end a double bond and represented by the following formula:
- ##STR4## (c) applying said suspension to outer surfaces of aluminum-based alloy pieces which are to be brazed and brazing said pieces.
A method of brazing aluminum-based alloy pieces, comprising by steps:
- (a) preparing a flux which comprises 65.6 to 99.9 wt % KAlF.sub.4 and 34.4 to 0.1 wt % K.sub.3 AlF.sub.6 ;
- (b) uniformly dispersing said flux in a polybutene to provide a suspension, said polybutene being a copolymer containing isobutylene as a major part and having at its terminal end a double bond and represented by the following formula:
- ##STR5## (c) applying said suspension to outer surfaces of the aluminum-based alloy pieces which are to be brazed and brazing said pieces.
A flux for use in brazing aluminum-based alloy pieces, comprising:
- 98 to 90 wt % base composition, said base composition including potassium fluorosilicate whose amount is 30 to 90 wt % to said base composition and zinc fluoride whose amount is 70 to 10 wt % to the base composition;
- 1 to 3 wt % sodium fluoride;
- and
- 1 to 7 % aluminum fluoride.
A method of brazing aluminum-based alloy pieces, comprising by steps:
- (a) preparing a flux which contains 98 to 90 wt % base composition, said base composition including potassium fluorosilicate whose amount is 30 to 90 wt % to said base composition and zinc fluoride whose amount is 70 to 10 wt % to the base composition;
- 1 to 3 wt % sodium fluoride;
- and 1 to 7 % aluminum fluoride;
- (b) uniformly dispersing said flux in a polybutene to provide a suspension, said polybutene being a copolymer containing isobutylene as a major part and having at its terminal end a double bond and represented by the following formula:
- ##STR6## (c) applying said suspension to outer surfaces of aluminum-based alloy pieces which are to be brazed and brazing said pieces.
Dependencies are inferred from the claim text.