Aqueous aluminum base solder paste

A brazing-based, water-based technology, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of poor environmental performance and storage difficulties of aluminum-based brazing paste, and achieve easy cleaning, easy storage, strong The effect of stability

Inactive Publication Date: 2012-07-25
ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of poor environmental performance and difficult storage of the existing aluminum-based brazing paste

Method used

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  • Aqueous aluminum base solder paste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A water-based aluminum-based brazing paste is composed of the following components: aluminum alloy brazing powder accounting for 65% of the total weight of the water-based aluminum-based brazing paste, and the aluminum alloy is composed of: Al 90%, Si 10% ; Account for the soldering flux of 20% of the total weight of the solder paste, the weight percentage of the soldering flux is composed of: AlF 3 54%, KF 46%; account for the paste body of 15% of the total weight of the solder paste, the weight percentage of the paste body is composed of: sodium carboxymethyl cellulose 1%, hydroxyethyl cellulose 1%, polyoxygen Ethylene 3%, water 20%, formamide 70%, propylene glycol 5%.

Embodiment 2

[0019] The solder paste of this example is composed of: aluminum alloy base solder powder accounting for 30% of the total weight of the solder paste, and the weight percentage of the aluminum alloy is composed of: Al 88%, Si12%; accounting for 30% of the total weight of the solder paste, its weight The percentages are grouped into: AlF 3 43.2%, KF 36.8%, NaF 15%, KCl 5%; accounting for 40% of the total weight of the solder paste, its weight percentage is composed of: ethyl cellulose 10%, polyvinylpyrrolidone 5%, N, N- Dimethylformamide 40%, N-methylpyrrolidone 25%, ethylene glycol 20%.

Embodiment 3

[0021] The solder paste of this example is composed of: aluminum alloy-based solder powder accounting for 60% of the total weight of the solder paste, and the weight percentage of the aluminum alloy is: Al 62%, Si10%, Cu 28%; accounting for 10% of the total weight of the solder paste Soldering flux, its weight percentage composition: AlF3 48.5%, KF 41.5%, CsF 10%; Accounting for the paste body of 30% of the total weight of solder paste, its weight percentage composition is: hydroxypropyl cellulose 1%, polyethylene oxide 1 %, water 13%, formamide 30%, dimethylformamide 60%, ethanol 5%, glycerol 10%.

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Abstract

The invention relates to an aqueous aluminum base solder paste that is good in environmental friendliness and storage, which consists of aluminum base solder powder, scaling powder and an aqueous paste forming body. The aqueous aluminum base solder paste consists of 30-70% of aluminum base solder powder, 5-35% of scaling powder and 10-40% of an aqueous paste forming body based on the weight of the aluminum base solder paste. The aluminum base solder powder is aluminum alloy solder powder. The aluminum alloy comprises the following elements by weight: 10-12% of Si, 0-30% of Cu, 0-35% of Zn and the balance of A1. The scaling powder comprises the following components by weight: 0-55% of AlF3, 10-48% of KF, 0-20% of CsF, 0-20% of NaF, and 0-15% of KCl based on the weight of the scaling powder. The paste forming body comprises the following components by weight: 0.1-20% of an aqueous thickening dispersant, 5-20% of an aqueous assistant and 60-95% of an aqueous solvent based on the weight of the paste forming body. The invention is suitable for being used as a solder paste.

Description

technical field [0001] The invention relates to a water-based aluminum-based brazing paste, which is suitable for aluminum-aluminum (aluminum alloy) and aluminum-stainless steel furnace brazing. Background technique [0002] There are various forms of solder used in aluminum-aluminum (aluminum alloy) and aluminum-stainless steel brazing in the industry, such as strips, strips, rings, powders, etc. However, these forms of solder are supplied in specific shapes. Once the shape of the finished product is made, it is difficult to change it, so the adaptability of the process is not strong. As a paste-like brazing material, solder paste can be applied to the weld seam by manual brushing or automatic injection feeding, etc. The dosage is controllable, and the shape of the weld seam can be changed arbitrarily; Welding processing of weldments with high dimensional accuracy. [0003] Traditional oil-based or solvent-based aluminum solder pastes have problems such as large smoke, he...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/363
Inventor 张玉张腾辉余国华金霞
Owner ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL
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