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Corrosion-resistant and high-strength anisotropic welding material and preparation method thereof

A welding material and high-strength technology, applied in the direction of welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of solder corrosion, environmental pollution, complex process, etc., and achieve the effect of improving corrosion resistance and strength

Pending Publication Date: 2020-05-08
程斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that welding between different metals is relatively difficult, but the development of modern technology requires more and more requirements for welding different metals together, especially in various special industries. At the same time, traditional steel or iron Materials can not meet the requirements of modern industry, various metals, including non-ferrous metals and alloys are more and more widely used
[0003] Therefore, for the welding between different metals, most of the welding methods are improved, such as fusion welding, pressure welding, spot welding, ultrasonic welding, argon arc welding, laser welding, etc. Some of these welding methods have complicated equipment and some Soldering fluid must be used for welding, which causes complex process and must be cleaned after welding, which will also cause environmental pollution. At present, there are some researches on welding materials of heterosexual metals, such as Japanese Open Patent Gazette, Zhao 61-154788, and other such as CN001039986 and CN001041556, the technology provided by these patent documents can weld some different metals, but the welding performance still has many shortcomings
CN1094666A discloses a rare-earth heterosexual metal welding material and its manufacturing method, which can better realize the welding of two metals, but its components are many, the preparation process is too complicated, and it is not suitable for industrial production
However, electronic equipment used in data communication bureau equipment, automobiles, military equipment, space-related equipment, outdoor entertainment equipment, etc. are often installed outdoors, and corrosion of solder becomes a problem.
At present, there is no research on the application of liquid crystal polymers in solder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation of embodiment 1-2 and comparative example 1-8

[0024] a. Put the Pb-Bi-Mn-Ca master alloy in the ratio of 1:1:0.5:1 into the crucible for melting, raise the temperature to 400°C, add the Pb-Bi master alloy in ratio of 1:1 after the metal is melted, keep the temperature and stir After melting, add Sn and the remaining other metals at the end, stir well, and the specific addition amount is shown in the table below;

[0025] b. Then naturally cool down the molten metal above to 330°C to 350°C for 15-20 minutes;

[0026] c. Take out the impurities on the surface of the molten alloy, then add the liquid crystal polymer, stir well, and put it into the mold. .

[0027] Example 1 Example 2 Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6 Comparative example 7 Comparative example 8 sn 62.3% 69.1% 71.4% 62.3% 62.3% 62.8% 63.2% 80.4% 68.5...

Embodiment 3

[0029] a. Put all the formula shown in Example 1 into the crucible for melting and heat up to 400°C, and fully stir after the metal is melted;

[0030] b. Then cool down the molten metal above naturally to 330°C to 350°C for 15-20 minutes;

[0031]c. Take out the impurities on the surface of the molten alloy, then add the liquid crystal polymer, stir well, and put it into the mold. .

[0032] The processability of each solder was evaluated. Rolling and annealing were repeated on the processed solder (thickness 1.5mm). If cracks or fractures occurred, the processing was stopped immediately. If no cracks or fractures occurred, processing was performed until the thickness reached 50 μm.

[0033] Use the 0.1mm thick plate obtained by pressing, after brazing between ceramic sheets of 10mm×10mm×20mm at 400°C in a vacuum atmosphere, cut out a test piece of 3mm×4mm×40mm, and pass the four-point bending test according to JIS R1601 measures the breaking strength at 10 points each. (...

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PUM

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Abstract

The invention provides a corrosion-resistant and high-strength anisotropic welding material. The welding material is characterized by being prepared from components in percentage by mass as follows: 50%-70% of Sn, 10%-40% of Bi, 5%-20% of Pb, 0.1%-1% of Mn, 0.1%-2% of Ca and 5%-20% of a liquid crystalline polymer; and the thermotropic liquid crystalline polymer is wholly aromatic copolyester withp-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, resorcinol and 4,4'-dihydroxybiphenyl as polymerization monomers and has the melting point being 300-380 DEG C, the ratio of Bi toPb is 2:1, and the ratio of Sn to the liquid crystalline polymer is 10:1. The welding material has outstanding corrosion resistant capability and excellent mechanical property, is simple to prepare,contains few components and is suitable for industrial production.

Description

technical field [0001] The invention relates to a metal welding material and a preparation method thereof. Background technique [0002] When welding two different metals, many difficulties will be encountered. For example, when the melting temperature is very different, one of the metals is already in a molten state, and the other metal is still in a solid state; the expansion coefficients of the two metals are different. When it is very large, a large thermal stress will be generated during the welding process, and this thermal stress cannot be eliminated. When the thermal conductivity and specific heat of the metal to be welded are different, the temperature field distribution during welding will be changed, thus requiring Changes the crystallization conditions of the weld, which are the conditions that determine the wettability characteristics of metals with higher melting points. The ability to obtain a satisfactory welded joint for dissimilar metals depends first on t...

Claims

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Application Information

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IPC IPC(8): B23K35/40B23K35/26
CPCB23K35/262B23K35/40
Inventor 程斌
Owner 程斌