Flux coated brazing sheet
First Claim
Patent Images
1. A method of making a flux-coated aluminum brazing sheet comprising:
- (a) combining a brazing flux with polyvinyl butyral binder and optionally an organic solvent to form a first mixture;
(b) shearing said first mixture to form a second mixture having uniformly dispersed brazing flux particles in said second mixture;
(c) combining said second mixture with an organic solvent to form a brazing flux mixture;
(d) coating at least a portion of the surface of an aluminum brazing sheet with said brazing flux mixture; and
(e) drying said brazing flux mixture on said aluminum brazing sheet surface.
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Abstract
A brazing flux mixture comprised of brazing flux, a polyvinyl butyral resin binder, and an organic solvent which can be applied over an entire aluminum alloy brazing sheet, or can be applied on the brazing sheet only where metallurgical bonds or joints are required, that is sufficiently durable to withstand processing operations and also provides good metallurgical bonds upon brazing.
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Citations
25 Claims
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1. A method of making a flux-coated aluminum brazing sheet comprising:
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(a) combining a brazing flux with polyvinyl butyral binder and optionally an organic solvent to form a first mixture;
(b) shearing said first mixture to form a second mixture having uniformly dispersed brazing flux particles in said second mixture;
(c) combining said second mixture with an organic solvent to form a brazing flux mixture;
(d) coating at least a portion of the surface of an aluminum brazing sheet with said brazing flux mixture; and
(e) drying said brazing flux mixture on said aluminum brazing sheet surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a brazing flux mixture comprising:
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(a) combining a brazing flux with a polyvinyl butyral binder to form a first mixture;
(b) shearing said first mixture to form a second mixture having uniformly dispersed brazing flux in said binder; and
(c) combining said second mixture with an organic solvent to form a brazing flux mixture. - View Dependent Claims (10, 11, 12, 13, 14)
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- 15. An unformed aluminum alloy brazing sheet product, having at least a portion of said sheet surface coated with a brazing flux compound comprising brazing flux and polyvinyl butyral.
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19. A method of making a shaped metal alloy product comprising:
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(a) combining a brazing flux with polyvinyl butyral binder and optionally an organic solvent to form a first mixture;
(b) shearing said first mixture to form a second mixture having uniformly dispersed brazing flux particles in said second mixture;
(c) combining said second mixture with an organic solvent to form a brazing flux mixture;
(d) coating at least a portion of the surface of at least two aluminum alloy brazing sheets with said brazing flux mixture;
(e) drying said brazing flux mixture on said aluminum alloy brazing sheet surfaces;
(f) forming said flux coated aluminum alloy brazing sheets into flux coated parts having predetermined shapes; and
(g) brazing said parts together to form a shaped metal alloy product.
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20. A brazing flux mixture for coating brazing sheet prior to sheet formation into a shaped product, said mixture comprising:
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(a) brazing flux;
(b) a polyvinyl butyral resin binder; and
(c) an organic solvent selected from the group consisting of ethyl acetate, n-butyl acetate, n-propyl acetate, acetone, cyclohexanone, ethyl alcohol, isopropyl alcohol, n-butanol, n-propyl alcohol, diacetone alcohol, dipropylene glycol monomethyl ether, propylene glycol methyl ether acetate and mixtures thereof. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification