Copper welding paste for automatic brazing and its preparing method

A copper solder paste and brazing technology, which are applied in the fields of paste-forming components and their preparation, copper flux, copper-phosphorus-tin-based solder, and the composition of copper solder paste, can solve the problem of increasing wettability and easy drying. It can solve the problems of chemical change and low boiling point, so as to achieve the effect of good fluidity, ensuring the appearance status, and increasing the surface binding force.

Inactive Publication Date: 2005-03-02
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1029407C discloses a copper-based solder paste and a welding method for copper ornaments. Although the patent CN1029407C and the product of this patent invention are all composed of copper solder, copper-based solder and organic paste, both The copper brazing flux, copper-based brazing filler metal and organic paste are obviously different in composition and preparation process. The brazing flux mentioned in patent CN1029407C is traditional FB102 and FB103, which have moisture absorption; in terms of brazing filler metal, this patent adds Trace elements increase wettability, corrosion resistance, etc. In terms of paste formation, the paste mentioned in patent CN1029407C has a low boiling point and is easy to dry, which is not suitable for automatic feeding

Method used

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Experimental program
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preparation example Construction

[0050] A kind of preparation method of above-mentioned copper solder paste, at first respectively make solder, brazing flux and paste body, its respective preparation steps are as follows:

[0051] a. Brazing material:

[0052] (1) According to the composition of the solder;

[0053] (2) Smelting under vacuum conditions;

[0054] (3) Refining and purification;

[0055] (4) Ultrasonic inert airflow pulverizes the molten metal flow into droplets;

[0056] (5) The liquid droplets are solidified and cooled under a protective atmosphere;

[0057] (6) Powder particle size classification;

[0058] (7) vacuum treatment;

[0059] (8) Intermediate products.

[0060] b. Flux:

[0061] Quickly condense the molten flux and grind at a high speed to prepare -160 mesh flux.

[0062] c, into a paste:

[0063] Select low, medium and high molecular weight polyisobutylene mixtures and organic solvents, non-ionic surfactants, additives, mix and heat to 80-150 ° C and fully stir to make an o...

Embodiment approach

[0067] The further principle of the present invention and technical scheme and embodiment are as follows:

[0068] (1) Solder

[0069] Brazing material is the main component of solder paste, which has a key influence on the brazing process and welding strength. The solder involved in the present invention uses Cu as the matrix, adds appropriate amount of alloy elements and adopts an original powder making process, so that the solder powder has the characteristics of fine structure, uniform composition, smooth and spherical surface of powder particles, etc. The defects of brazing filler metal, such as high weld brittleness, low strength, poor air tightness and poor electroplating performance due to the existence of P, are greatly improved, and the mechanical properties and brazing process performance of the brazing filler metal are well improved.

[0070] The brazing filler metal used in this solder paste is prepared by vacuum smelting ultrasonic airflow atomization powder mak...

Embodiment 1

[0089] Example 1 The components in the solder are: P: 5.5%, Sn: 6%, Ni: 0.5%, B and a trace amount of rare earth elements, and the balance Cu. In the flux after melting, B: 13.5%, K: 30.2%, F: 45.6%, O: balance. Polyisobutylene mixed in organic paste (7.75%): 15.6%, C 6 -C 15 : 82.3%, Surfactant: 1.2%, Additive: 0.9%. Brazing filler metal: brazing flux = 84.5: 15.5.

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Abstract

The copper base welding paste for automatic brazing includes brazing material, brazing agent and paste forming material. The brazing material has Cu as main material and added alloy elements P, Sn, Ni, B, Ti, In and RE; the brazing agent consists of chemically synthesized intermediate polyboride M, potassium fluoroborate N and flux Q; and the paste forming material consists of mixture of polyisobutylene in different molecular weight and organic solvent. The copper base welding paste has good flowability, wetability and gap-filling performance, etc. and is suitable for industrial production.

Description

technical field [0001] The invention relates to a copper solder paste for automatic brazing, in particular to a composition of the copper solder paste-copper phosphorus tin-based solder, copper flux, components for forming a paste and a preparation method thereof. Background technique [0002] With the advancement of brazing science and technology and the miniaturization, diversification and complexity of the shape of brazing workpieces, the brazing processing industry has gradually replaced backward manual production with highly efficient automated production lines. The brazing operation process is to manually dip the wire-shaped, strip-shaped or sheet-shaped solder with flux, and then fix the solder coated with flux to the part of the workpiece to be brazed, and then heat the workpiece to melt the solder. The welding of the workpiece has extremely low production efficiency, which is extremely disharmonious with the modern high-speed economic development. It will be replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F23/70B23K35/30B23K35/365C22C1/02
Inventor 陈志祥杨凯珍曾燕刘宏江刘凤美黄齐博蔡志红蔡沛沛刘福平陈平周美霞黄云帅张碧波钟文晨
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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