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Preparing method of AuSn20 brazing filler metal for improving braze performance

A performance and brazing technology, which is applied in welding equipment, welding/cutting media/materials, manufacturing tools, etc., can solve problems such as uneven composition of alloy solder, high brittleness of alloy solder, and complex process, etc., to improve brazing Welding performance, lower vacuum brazing temperature, uniform chemical composition

Inactive Publication Date: 2017-10-10
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the AuSn20 alloy solder prepared by the gold-tin lamination method is uneven, and the composition deviates from the eutectic point, resulting in a high melting point and poor welding performance; the casting process is complicated, and the prepared AuSn20 alloy solder is brittle, difficult to process, and clean. Not enough, the oxidation slag generated on the surface during brazing leads to unreliable brazing; the plating speed of the electroplating deposition method is slow, the foil produced is very thin, lacks flexibility, and the application is limited

Method used

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  • Preparing method of AuSn20 brazing filler metal for improving braze performance
  • Preparing method of AuSn20 brazing filler metal for improving braze performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare the gold-tin raw material, the mass percentage of tin and gold is 1:4, put the weighed gold-tin raw material into a graphite crucible, heat it in a vacuum induction furnace, take it out after the melt is cooled, and cast the obtained gold-tin alloy The ingot was put into the graphite crucible again, and heated in a vacuum induction furnace. After repeating this three times, the gold-tin alloy ingot was obtained. Smash the massive gold-tin alloy ingot and put it into a quartz tube with a rectangular opening at the bottom. The distance between the bottom of the quartz tube and the copper roller is 2mm. Turn on the single roller stripping device, adjust the roller speed to 3000r / min, and then adjust the nitrogen gas flow pressure to 0.2Mpa. The gold-tin alloy ingot in the quartz tube is heated by induction heating. After heating for 4 minutes, it is directly sprayed onto the copper roller and moves with the roller surface to finally obtain the gold-tin alloy foil w...

Embodiment 2

[0020] Prepare the gold-tin alloy raw material, weigh it according to the mass percentage of gold and tin at 4:1, put the weighed gold-tin raw material into a graphite crucible, heat it in a vacuum induction furnace, take it out after the melt is cooled, and put the obtained gold-tin The alloy ingot was put into the graphite crucible again, and heated in a vacuum induction furnace. After repeating this for three times, the gold-tin alloy ingot was obtained. Smash the massive gold-tin alloy ingot and put it into a quartz tube with a rectangular opening at the bottom. The distance between the bottom of the quartz tube and the copper roller is 4mm. Turn on the single-roller stripping device, adjust the roll speed to 2800r / min, and then adjust the nitrogen gas flow pressure to 0.3Mpa. The gold-tin alloy ingot in the quartz tube is heated by induction heating. After heating for 5 minutes, it is directly sprayed onto the copper roller and moves with the roller surface, and finally t...

Embodiment 3

[0022] Prepare the gold-tin alloy raw material, weigh it according to the mass percentage of gold and tin at 4:1, put the weighed gold-tin raw material into a graphite crucible, heat it in a vacuum induction furnace, take it out after the melt is cooled, and put the obtained gold-tin The alloy ingot was put into the graphite crucible again, and heated in a vacuum induction furnace. After repeating this for three times, the gold-tin alloy ingot was obtained. Smash the massive gold-tin alloy ingot and put it into a quartz tube with a rectangular opening at the bottom. The distance between the bottom of the quartz tube and the copper roller is 5mm. Turn on the single-roller stripping device, adjust the roll speed to 2000r / min, and then adjust the nitrogen gas flow pressure to 0.3Mpa. The gold-tin alloy ingot in the quartz tube is heated by induction heating. After heating for 4 minutes, it is directly sprayed onto the copper roller and moves with the roller surface, and finally t...

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Abstract

The invention discloses a preparing method of AuSn20 brazing filler metal for improving braze performance. A single roller melt-spinning quick set technology is adopted for preparing the AuSn20 foil brazing filler metal, and the preparing method comprises the following steps that (1) raw materials are prepared, wherein tin and gold raw materials with the purity being 99.99% are selected, and the raw materials are prepared according to the mass percentage being 1:4; (2) alloy smelting is carried out, wherein smelting is carried out in a vacuum induction furnace, the vacuum degree is 1*10<2>-1*10<-6> Mpa, repeated overturning smelting is carried out for 3-4 times, and a gold-tin alloy ingot is obtained; and (3) melt-spinning is carried out. Compared with a technical method for preparing the AuSn20 brazing filler metal, the preparing method has the beneficial effects that the alloy achieves complete alloying, the smelting point of the brazing filler metal is reduced, the welding performance is better, and the brazing filler metal foil thickness is controllable. In addition, according to the method, operation does not need to be carried out under high vacuum and the protective atmosphere, the process operation is simple, cost is low, and the preparing method is suitable for batched production.

Description

technical field [0001] The invention relates to a manufacturing process of gold-based alloy solder, in particular to a preparation method of AuSn20 alloy solder foil. Background technique [0002] With the continuous development of electronic packaging technology, solder joints in electronic packaging are becoming more and more precise. At present, the vast majority of failed electronic devices are caused by reliability problems of solder joints. AuSn20 eutectic alloy, with a melting point of 280°C, has excellent welding properties such as high strength, high thermal conductivity and flux-free, and is widely used in the field of electronic packaging. The solder joint reliability of AuSn20 alloy solder mainly focuses on its thermodynamic properties, Creep and fatigue resistance, as well as the preparation process of solder, etc., have caused a series of brazing performance problems due to the immature preparation process. In recent years, the techniques for preparing AuSn20...

Claims

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Application Information

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IPC IPC(8): B23K35/40
CPCB23K35/40
Inventor 许昆赵晓然刘毅李伟张健康罗锡明程勇罗雁波
Owner SINO PLATINUM METALS CO LTD
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