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Paste composition for aluminum brazing

一种组合物、铝钎焊的技术，应用在焊接介质、焊接设备、焊接/切割介质/材料等方向，能够解决热分解性能差、产生黑色残渣物等问题，达到钎焊性优异、简便涂布作业的效果

Active Publication Date: 2009-06-24
HARIMA CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, in the invention described in the aforementioned Japanese Patent Laid-Open No. 7-155987, since a polyalkylene oxide resin is used as a binder, the thermal decomposition performance is essentially poor.
Therefore, when the atmosphere (oxygen concentration) during brazing is high, there is a problem that black residues are generated

Method used

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  • Paste composition for aluminum brazing
  • Paste composition for aluminum brazing

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Examples 1 to 3 are examples in which the component (a), that is, the metal powder for brazing (brazing filler metal powder) is different in type, but the other components and compositions are the same. Example 4 is an example in which the type of methacrylate polymer which is the component (c) is different from Example 1. Example 5 is an example in which the overall composition is different from Examples 1-4. That is, as the above-mentioned component (c) (binder), in Examples 1 to 3 and 5, a homopolymer of 2-ethylhexyl methacrylate (methacrylate polymer (A)) was used, In Examples 4 and 6, a copolymer of 2-ethylhexyl methacrylate and 2-hydroxyethyl methacrylate (methacrylate-based copolymer (C)) was used.

[0062]On the other hand, among Comparative Examples 1 to 8 below, Comparative Example 1 is an example in which the viscosity of the solder paste composition exceeds the upper limit of the suitable range of the present invention. Comparative Example 2 is an example ...

Embodiment 1～6 and comparative example 1～8

[0065] Each compounding component was mixed with the composition shown in Table 1 and Table 2, and the solder paste composition for aluminum brazing which has the viscosity (23 degreeC) shown in Table 1 and Table 2 was manufactured. Then, the viscosities at 23° C. were measured using a screw pump viscometer (“PCU-205” manufactured by Malcolm Co., Ltd.) at a stirring rate of 10 rpm, and the following (i) to (vi) were performed for each of the obtained solder paste compositions. various evaluation tests. The results are shown in Tables 1 and 2 together.

[0066] In addition, the details of each compounding component shown in Table 1 and Table 2 are as follows.

[0067]

[0068] ・Al-12Si alloy: average particle size = 52μm

[0069] ・Al-10Si alloy: average particle size = 55 μm

[0070] ・Al-10Si alloy-1Zn alloy: average particle size = 49 μm

[0071]

[0072] Fluoride-based flux (potassium fluoroaluminate): "Nocoloc Flux 100" manufactured by Solvay Co., Ltd.

[0073]

...

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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 DEG 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. Additionally, the invention provides an aluminum brazing method used for brazing aluminum members, wherein the above paste composition for aluminum brazing is coated on aluminum members so as to heat the aluminum members in a predetermined structure.

Description

technical field [0001] The present invention relates to a solder paste composition for aluminum brazing that is excellent in storage stability, applicability, and solderability. Background technique [0002] For example, members made of aluminum or an aluminum alloy are used in aluminum heat exchangers for automobiles represented by evaporators, condensers, and the like mounted on vehicles. When these members are brazed, a composition obtained by mixing a flux for brazing or a mixture of flux and brazing filler metal with an adhesive for uniform adhesion to the joint is applied to the brazed portion, assembled, heated, for brazing operations. [0003] The following (1)-(6) are mentioned as a prior art of the said composition for aluminum brazing. [0004] (1) Japanese Patent No. 2681380 [0005] Disclosed is a brazing material composition for aluminum or an aluminum alloy containing metal powder for brazing, an acrylic resin (binder) with a molecular weight of 1,000 to 10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
CPCB23K35/025B23K35/362B23K35/0244B23K35/286B23K35/22B23K35/3613B23K35/361
Inventor 赤泽知明照濑正树谷中一朗手岛圣英山本钦也伊藤彰武藤健
Owner HARIMA CHEM INC
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