US 8,075,706 B2Granted

Paste composition for aluminum brazing

AssigneesHarima Chemicals, Inc., Denso Corporation

InventorsTomoaki Akazawa, Masaki Teruse, Ichiro Taninaka, Shoei Teshima, Kinya Yamamoto, Akira Itoh, Ken Muto

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Abstract

A paste composition for aluminum brazing of the invention contains 40 to 65% by weight of a metal powder for brazing (a), 5 to 35% by weight of a fluoride type flux (b), 1 to 10% by weight of a methacrylic acid ester type polymer (c), and 10 to 40% by weight of an organic solvent (d); and the component (d) is a hydrocarbon type organic solvent having no aromatic ring and no hydroxyl group and the composition is in a paste-like state having a viscosity of 6,000 to 200,000 mPa·s at 23° C. and accordingly, the storage stability and applicability (practically, discharge property and pressure stability by using a dispenser) and brazing property can be improved in good balance.

Claims8

Dependent claims

A paste composition for aluminum brazing comprising

40 to 65% by weight of a metal powder for brazing (a),
5 to35% by weight of a fluoride type flux (b),
1 to 10% by weight of a methacrylic acid ester type polymer (c), and
10 to 40% by weight of an organic solvent (d),
wherein the organic solvent (d) is a naphthene type alicyclic hydrocarbon having no aromatic ring and no hydroxyl group, where the naphthene type alicyclic hydrocarbon type organic solvent has a boiling point of 150° C. or higher, the methacrylic acid ester type polymer(c) is a polymer selected from the group consisting of homopolymers of C1 to C18 alkyl esters of methacrylic acid and copolymers of C1 to C18 alkyl esters of methacrylic acid and hydroxyl group-containing methacrylic acid esters, where the hydroxyl group-containing methacrylic acid esters have neither a carboxyl group nor a sulfonic acid group, and the composition is a paste-like state having a viscosity of 6,000 to 200,000mPa·at 23° C.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/340,196Filed 19 Dec 2008
Priority: JP 2007-33112121 Dec 2007
Published: US 2009/0165893 A12 Jul 2009
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B23K 35/0244
For use in soldering or brazing: powders, particles or spheres; Preforms made therefrom
B23K 35/025
Powders, particles or spheres; Preforms made therefrom: pastes, creams or slurries
B23K 35/22
Rods, electrodes, materials, or media, for use in soldering, welding, or cutting: characterised by the composition or nature of the material
B23K 35/286
With the principal constituent melting at less than 950°C: al as the principal constituent