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A kind of manufacturing method of low-melting point solder spherical powder

A spherical powder, manufacturing method technology, applied in manufacturing tools, welding/cutting media/materials, welding media, etc., can solve the problem that the composition and process of low melting point solder are not specifically involved and studied, and achieve the consistency of microstructure Good, high powder sphericity, no macrosegregation effect

Active Publication Date: 2017-05-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not specifically involve and study the composition and process of low melting point solder

Method used

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  • A kind of manufacturing method of low-melting point solder spherical powder

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Experimental program
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Effect test

Embodiment 1

[0020] For the preparation of spherical tin powder, take 1 gram of tin oxide powder and graphite powder with a size of about 400nm, and mix them uniformly by mechanical stirring at a ratio of 1:1 by weight. Put the mixed tin oxide / 400nm graphite mixed powder into the alumina crucible, put the crucible into the heating zone of the annealing furnace, pass in hydrogen gas, the pressure is 0.02MPa, heat to 500°C, keep it for 30 minutes, then stop heating, with the furnace cool down. The tin / graphite mixed powder is soaked in water, and the tin balls are obtained by ultrasonic cleaning. figure 1 This is the scanning electron micrograph of the appearance of the obtained solder balls, and the size of the spherical particles is between 40 μm and 80 μm. According to the manufacture method of tin spherical powder of the present invention, as figure 1 As shown, it was confirmed that solder balls could be obtained.

Embodiment 2

[0022] For the preparation of AgCu30ln5 alloy spherical powder, first, the purchased irregular silver-copper-indium alloy powder prepared by water mist method with a thickness of about 100 μm is used as a raw material. Take 1 gram of the raw material powder and the graphene powder whose size is less than about 1 μm, and mix them uniformly after mechanical stirring at a ratio of 5:1 by weight.

[0023] Put the mixed silver-copper-indium alloy / graphene mixed powder into an alumina crucible, put the crucible into the non-heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, the heating zone of the annealing furnace is heated to 820°C, and the crucible with silver-copper-indium alloy / graphene powder is pushed into the heating zone at 820°C, and after 5 minutes of insulation, the crucible with silver-copper-indium alloy / graphene powder The crucible is pulled out of the heating zone to cool. The silver-copper-indium alloy / graphene mixed powder is soaked in water, and t...

Embodiment 3

[0025] Metal oxides are used to manufacture low melting point solder spherical powder. Weigh silver acetate, copper oxide and tin oxide powders according to the mass percent (Ag:Cu:Sn=68:27:5wt%) of required silver-based alloy components and mix evenly, get 1 gram of this mixed powder and size is 400nm The left and right graphite powder is mixed according to the mass ratio of 1:1, mechanically stirred, and mixed evenly again.

[0026] Put the mixed powder of the above-mentioned metal oxide / 400nm graphite powder into an alumina crucible, put the crucible into the heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, pass in hydrogen 0.02MPa, heat to 450°C for reduction, keep warm for 60 minutes, evacuate to 10Pa, heat the heating zone of the annealing furnace to 780°C, keep warm for 10 minutes, the obtained silver-copper-tin alloy / 400nm graphite The crucible of powder is pulled out of the heating zone to cool. The alloy / 400nm graphite mixed powder is soaked in wa...

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Abstract

The invention discloses a spherical low-melting-point brazing filler metal powder manufacturing method. The spherical low-melting-point brazing filler metal powder manufacturing method comprises the specific steps of preparing low-melting-point brazing filler metal powder, preparing an even mixture formed by the low-melting-point brazing filler metal powder and carbon material powder or ceramic material power, enabling low-melting-point brazing filler metal to be molten and to solidify into metal balls, and separating the carbon material powder or the ceramic material power to obtain the spherical low-melting-point brazing filler metal. The low-melting-point brazing filler metal is stannum-based brazing filler metal, indium-based brazing filler metal, silver-based brazing filler metal, lead-based brazing filler metal, cadmium-based brazing filler metal, zinc-based brazing filler metal or bismuth-based brazing filler metal. The spherical low-melting-point brazing filler metal spherical powder manufacturing method is simple and environment-friendly and can be used for scale production of spherical low-melting-point brazing filler metal powder.

Description

technical field [0001] The invention belongs to the technical field of alloy solder powder processing for the metallurgical industry and the electronic industry, and in particular relates to a method for manufacturing low melting point solder spherical powder. Background technique [0002] The spherical solder manufacturing technology is quite mature and widely used in ball grid array packaging (BGA), laser cladding, thermal spraying, surfacing welding and other fields. The main technologies for preparing spherical solder are: the gas atomization method and the centrifugal atomization method in which liquid droplets are sprayed and solidified into balls. For example, the patent CN100484669C discloses a manufacturing device for tiny solder alloy solder balls, which adopts gas pressure injection, liquid metal Spheroidization in an inert gas, the patent is mainly improved on the device; the shredding or punching remelting method of mechanical shearing into balls is suitable for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/24B23K35/36
CPCB23K35/24B23K35/36B23K35/3601B23K35/3606B23K35/40
Inventor 唐少龙程振之雷成龙黄海富都有为
Owner NANJING UNIV
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