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Silver brazing paste and preparation method thereof

A silver brazing and silver welding technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve problems such as complex methods, and achieve the effects of simple preparation process, accelerated brazing process, and simple and effective operation.

Active Publication Date: 2016-06-08
研迈电子材料(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method solves the problem of graphene agglomeration and floating by plating metal on the surface of graphene, which is too complicated

Method used

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  • Silver brazing paste and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing a high thermal and conductive silver solder paste, the basic steps are as follows:

[0034] In the first step, weigh 2g of graphite powder and put it into a clean ball mill tank, and weigh stainless steel balls according to the ball-to-material ratio of 10:1 (number ratio of 5mm to 15mm in diameter is 4:1). Then add 100ml of absolute ethanol, cover and seal it, put it into a planetary ball mill for ball milling for 4 hours (rotation 1200rpm, revolution 600rpm), take it out and dry it to obtain dry graphene.

[0035] In the second step, the graphene obtained in the first step is added to the mixed colloid of polyethylene and vaseline (viscosity 5000cp, polyethylene and vaseline mass ratio is 1:1) with an addition of 5wt%, to obtain graphene / carrier decentralized system. Even better, the graphene and the carrier can also be stirred to obtain a graphene / carrier dispersion system.

[0036] In the third step, add silver-coppe...

Embodiment 2

[0040] This embodiment provides a kind of preparation method of high thermal conductivity silver solder paste, and the difference with embodiment 1 is: increase the addition ratio of graphene in the solder paste, increase the number of times of grinding of the three-roll mill, and simultaneously Other related parameters were changed.

[0041] The basic operation steps of the preparation of the present embodiment 2 high thermal conductivity silver solder paste are as follows:

[0042] In the first step, weigh 20g of graphite powder and put it into a clean ball mill jar, and weigh stainless steel balls according to the ball-to-material ratio of 5:1 (number ratio of 5mm to 15mm in diameter is 4:1). Then add 50ml of absolute ethanol, cover and seal it, put it into a planetary ball mill for ball milling for 24h (1200rpm rotation, 600rpm revolution), take it out, dry it and grind it to obtain dry graphene.

[0043] In the second step, the graphene obtained in the first step is added ...

Embodiment 3

[0048] This embodiment provides a kind of preparation method of high thermal conductivity silver solder paste, and the difference with embodiment 1 is: increase the number of times of grinding of the three-roll mill and increase the viscosity of the carrier in the solder paste, and change the Types of solder powder and flux, and related parameters.

[0049] The basic operation steps of the preparation of the present embodiment 3 high thermal conductivity silver solder paste are as follows:

[0050] In the first step, weigh 10g of graphite powder and put it into a clean ball mill jar, and weigh stainless steel balls according to the ball-to-material ratio of 15:1 (number ratio of 5mm to 15mm in diameter is 4:1). Then add 75ml of absolute ethanol, cover and seal, put into a planetary ball mill for ball milling for 15h (1200rpm rotation, 600rpm revolution), take out, dry and grind to obtain dry graphene.

[0051] In the second step, the graphene obtained in the first step is add...

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Abstract

The invention provides silver brazing paste and a preparation method thereof. The method comprises the following steps: (1) graphene is dispersed in a carrier with a certain viscosity to obtain a graphene / carrier dispersion system; (2) silver welding powder and a brazing agent are added in the graphene / carrier dispersion system to obtain a graphene / carrier / silver welding powder / brazing agent mixed system; and (3) the mixed system, obtained in the step (2), is grinded to obtain the high heat conductivity and high electricity conductivity type solver brazing paste with uniformly dispersed graphene. The silver brazing paste can effectively solve the problems of weak electricity and heat conductivity and long welding time in traditional welding paste. The method has such advantages as simple operation and high practicability, and greatly improves all performances of the traditional welding paste.

Description

technical field [0001] The invention belongs to the technical field of soldering, in particular to a silver brazing paste and a preparation method thereof. Background technique [0002] Silver solder paste has a low melting point, good wettability and the ability to fill gaps. After welding, the joint has the advantages of high strength, excellent electrical conductivity and corrosion resistance. It has been widely used in refrigeration, electrical appliances, aerospace and other fields. During the automatic brazing process, the solder paste can be quantitatively spread on the place to be soldered, and it can be quickly and accurately dispensed with automatic welding equipment, thus greatly improving the brazing efficiency, and is generally favored by users. In the induction welding process, the heat generated by the eddy current resistance of the surface of the metal to be welded and the metal powder in the solder paste is used as the heat source, and at the same time, hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40
CPCB23K35/025B23K35/40
Inventor 毛琳王鹏鹏陈乐生沈敏华
Owner 研迈电子材料(上海)有限公司
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