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Brazing aluminum alloy powder composition

A composite, aluminum alloy technology, applied in welding media, welding equipment, metal processing equipment, etc., can solve the problem of uneconomical brazing powder, and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2003-04-09
MITSUBISHI ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to these problems, conventional brazing powders are not economical

Method used

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  • Brazing aluminum alloy powder composition
  • Brazing aluminum alloy powder composition
  • Brazing aluminum alloy powder composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] As shown in Table 1, several aluminum alloy powder samples were provided according to the present invention, each containing different amounts of Si and Zn (their maximum particle size was 75 μm and the average particle size was 20-30 μm). In addition, there are also provided brazing fluxes composed of fluorides and adhesives composed of acrylic resins. Then the three are mixed according to the weight ratio of 10:1:1 to obtain brazing powder. For comparison with these inventive samples, non-inventive samples containing Al-Si alloys or Al-Si-Zn alloys were provided.

[0087] Use the above sample to weld if Figure 5 The two metal parts shown have an inverted T configuration by applying different amounts of paint to the space between the two parts and this test is done to check how well the space is filled. Specifically, a metal member 30 is placed horizontally, and the member is made of JIS A 3003 aluminum alloy as a butt welding metal, and its dimensions are 30 mm hig...

Embodiment 2

[0101] In this example, atomized Al-Si-Zn ternary alloy powders having the composition and average particle size shown in Table 2 were prepared, which included molten Al. The Al-Si-Zn ternary alloy also includes pure Si powder with an average particle size shown in Table 2. Several solder powder samples of the present invention were thus obtained. Each of these samples, numbered 1-10, contained total amounts of Si and Zn, respectively, in the ratios listed in Table 2. These samples are referred to as "invention samples". For comparison with these samples, non-inventive samples 1-5 were also prepared. These samples were referred to as "non-inventive samples".

[0102] There is also provided another non-inventive sample called "Prior Art Sample" which contains Al-Si binary alloy powder. Then add 1 part of brazing auxiliary agent and 1 part of binding agent in each sample 1-10 of the present invention, non-invention sample 1-5 and prior art sample of 10 parts by weight, all b...

Embodiment 3

[0107] The brazing powder was prepared as follows, firstly the Al-Si powder (75wt% Al and 25wt% Si) was prepared by mechanical pulverization method, the average particle size of the powder was 40 μm (actual particle size was 5-60 μm), and the average particle size was prepared by atomization method Zn powder with a particle size of 20 μm (the actual particle size is 3-35 μm), followed by preparation of fluoride-based brazing flux, acrylic resin binder, isopropanol solvent, and Al-Si powder: Zn powder: Agent: binder: solvent in a weight ratio of 4:1:10:2:25 and mix them together.

[0108] The brazing powder composition is placed in the container 13 in the coating system of the above-described embodiment, using the coating system to apply the brazing powder composition at 20 g / m 2 The average speed is coated on the surface of extruded flat tubes used as tubes made of JIS A3003 aluminum alloy. For comparison, in addition, a comparative brazing powder composition was coated on th...

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Abstract

A brazing powder comprises a single powder or mixture powder that is composed of one or more type of elements consisting of Al, Si and Zn, having the composition of Al-Si-Zn hypereutectic alloy in terms of the total amount. The brazing powder comprises above 15% but up to 60% by weight of Si and 5% to 30% by weight of Zn. The brazing powder may also comprises a brazing flux, a binder resin and a solvent that are mixed with the above composition into a slurry form. A coating of the resulting mixture may be applied onto an object made of aluminum or aluminum alloy, such as mechanical assembly parts, etc., which is heated to allow the surface of the object to be melted, thereby forming a Zn-contained layer. The object is then brazed by soldering.

Description

technical field [0001] The present invention relates to a brazing powder composition for welding articles such as aluminum alloy or aluminum machine parts, components, parts, etc., and a method of using the brazing powder composition to weld such parts. One possible application is in the manufacture of heat exchanger components. Background technique [0002] As a method of brazing joining one or more articles made of aluminum or an aluminum alloy, powdery brazing material is used, and the brazing material is applied to the joining surfaces of the articles to be joined. A typical example is disclosed in US3971501, wherein the brazing powder can be used without or being limited by the shape, form, etc. Some of the items handled, such as objects with complex configurations. In this regard, the above-mentioned U.S. patents have attracted considerable attention. [0003] The brazing powder disclosed in the above-mentioned patent uses an Al-Si eutectic alloy whose melting point...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28
Inventor 兵库靖宪桃崎博人当摩建
Owner MITSUBISHI ALUMINUM CO LTD
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