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Preparation method of graphene reinforced tin-based composite brazing filler metal

A technology of composite solder and graphene, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., to achieve the effects of less energy consumption, shortened process time, and good composite effect

Pending Publication Date: 2022-08-05
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings and deficiencies in the preparation technology of existing tin-based solder and graphene composite solder, obtain a graphene-reinforced tin-based solder with better performance

Method used

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  • Preparation method of graphene reinforced tin-based composite brazing filler metal
  • Preparation method of graphene reinforced tin-based composite brazing filler metal
  • Preparation method of graphene reinforced tin-based composite brazing filler metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 The Sn+0.02% graphene composite brazing filler metal was prepared by single press molding, and the steps were as follows:

[0028] (1) Weighing: Use an electronic balance to weigh 0.8 mg of graphene and 4 g of tin powder. The number of graphene layers used is 6-9 layers, and its SEM photos are as follows figure 1 As shown, the maximum particle size of the tin powder is 30 μm, such as figure 2 shown;

[0029] (2) Graphene pretreatment: put the multi-layer graphene weighed in step 1 into a beaker, add alcohol, and the volume ratio of graphene to alcohol is about 1:2. The beaker containing graphene and alcohol was placed in a small ultrasonic device for ultrasonic treatment, and the ultrasonic time was 2 min to form a graphene alcohol suspension. After ultrasonication, stir and observe with a glass rod, and there should be no graphene agglomeration by visual inspection;

[0030] (3) Mixing powder: Pour the tin powder weighed in step 1 into the graphene alcoh...

Embodiment 2

[0034] Embodiment 2 Prepare Sn+0.02% graphene composite solder, the steps are as follows:

[0035] (1) step 1 weighing;

[0036] (2) step 2 graphene pretreatment;

[0037] (3) step 3 mixes powder;

[0038] The specific implementation of the above three steps is the same as that of Example 1.

[0039] (4) Press molding: put the mixed powder obtained in step 3 into a mold with an inner diameter of 15 mm, pressurize it under a press, the loading pressure rises from 0 to 300 MPa, the loading rate is 1 MPa / s, and the pressure holding time after loading for 5min. The composite brazing filler metal sheet after compression molding is taken out from the mold, thereby obtaining a composite material sheet of tin+graphene. image 3 shown.

[0040] (5) Secondary compression molding: Take out the composite brazing filler metal sheet obtained in step 4, and re-fill the mold with the overflowing part around the cutting for secondary compression molding. The loading pressure, loading rat...

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Abstract

The invention belongs to the field of composite materials, and discloses a preparation method of graphene reinforced tin-based composite brazing filler metal. The preparation process of the composite brazing filler metal comprises the steps that graphene is put into a proper amount of alcohol for ultrasonic treatment, the graphene subjected to ultrasonic treatment and tin powder are mixed and stirred, the obtained mixed powder is put into a mold to be pressed and formed, metal tin generates plastic flow in the pressing process, the graphene is evenly dispersed in a matrix through the plastic flow of the metal tin, and the composite brazing filler metal is obtained. And finally, the composite brazing filler metal with a better composite effect is obtained. According to the composite brazing filler metal prepared through the technological method, due to plastic flowing of materials in the pressurizing process, uniform dispersion of graphene is achieved. And moreover, the technological process is simple and efficient, the equipment requirement is low, the energy consumption is low, industrial production is easy, and the method can be applied to the field of microelectronic brazing.

Description

Technical field: [0001] The invention belongs to the field of composite materials, and relates to a preparation method of a graphene-reinforced tin-based solder. Background technique: [0002] With the rapid development of the electronics industry, brazing is a main welding method for connecting lead joints in the electronics industry. Since the implementation of lead-free in the field of electronic packaging, the development of lead-free solder with low cost, good wettability, good electrical conductivity and comprehensive mechanical properties has become the focus of enterprises and major research units. [0003] Graphene is a new type of material with good electrical conductivity, thermal conductivity and mechanical properties. Adding graphene as a reinforcing phase to tin-based solder can improve the performance of the solder. Combining traditional brazing filler metals with graphene to prepare composite brazing filler metals with better performance than traditional bra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40
CPCB23K35/40
Inventor 李雪梅贺新栋樊锐郭宇欣王大为李程刘萌李明黄颖张书瑞
Owner QIQIHAR UNIVERSITY