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Preparation method of graphite-nano-silver composite solder paste sintering material

A technology of sintering material and nano-silver, applied in welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problem of high cost of nano-silver solder paste, and achieve the effect of improving agglomeration, reducing occurrence and reducing cracks

Inactive Publication Date: 2020-07-03
SHENZHEN INST OF WIDE BANDGAP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this, the present invention will solve the high cost problem of the nano-silver solder paste prepared by the existing method and provide a kind of preparation method of graphite-nano-silver composite solder paste sintered material, comprising the following preparation steps:

Method used

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  • Preparation method of graphite-nano-silver composite solder paste sintering material
  • Preparation method of graphite-nano-silver composite solder paste sintering material
  • Preparation method of graphite-nano-silver composite solder paste sintering material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The preparation process of nano silver solder paste is as follows:

[0050] (1) surfactant fatty acid glyceride is dissolved in distilled water and is made into the surfactant aqueous solution that surfactant mass concentration is 10%;

[0051] (2) Under constant temperature and constant magnetic stirring speed at 25°C, uniformly mix silver nitrate aqueous solution, ethylene glycol, and surfactant to obtain a mixed solution, and the mass ratio of the three is 1:8:1.

[0052](3) Mix the functionalized graphite solution and silver nitrate mixed solution, and stir evenly with a magnetic stirrer for 1 hour to obtain the mixed solution. Adding 0.5 mol / L hydrazine hydrate solution dropwise into the mixed solution converts the silver ions in the mixed solution into elemental silver, and after the reaction is complete, washes and centrifuges with ethanol to obtain nano-silver solder paste.

[0053] The joint strength is 25-35MPa, the wettability is good (contact angle is less ...

Embodiment 2

[0055] A preferred embodiment includes the following preparation steps:

[0056] (1) Nano-graphite powder is ultrasonically dispersed in deionized water, the mass concentration of nano-graphite is 10%, and it is made into nano-graphite suspension;

[0057] (2) dissolving surfactant fatty acid glyceride in distilled water is made into the surfactant aqueous solution that surfactant mass concentration is 10%;

[0058] (3) Mix the graphite suspension and the surfactant aqueous solution under stirring with a magnetic stirrer, then centrifuge to obtain a precipitate, and disperse the precipitate in distilled water to obtain a functionalized graphite aqueous solution.

[0059] (4) Under constant temperature and constant magnetic stirring speed at 25°C, uniformly mix silver nitrate aqueous solution, ethylene glycol, and surfactant to obtain a mixed solution, and the mass ratio of the three is 1:8:1.

[0060] (5) Mix the functionalized graphite solution and the silver nitrate mixed s...

Embodiment 3

[0063] A preferred embodiment includes the following preparation steps:

[0064] (1) Nano-graphite powder is ultrasonically dispersed in deionized water, the mass concentration of nano-graphite is 20%, and it is made into nano-graphite suspension;

[0065] (2) dissolving surfactant fatty acid glyceride in distilled water is made into the surfactant aqueous solution that surfactant mass concentration is 10%;

[0066] (3) Mix the graphite suspension and the surfactant aqueous solution under stirring with a magnetic stirrer, then centrifuge to obtain a precipitate, and disperse the precipitate in distilled water to obtain a functionalized graphite aqueous solution.

[0067] (4) Under constant temperature and constant magnetic stirring speed at 25°C, uniformly mix silver nitrate aqueous solution, ethylene glycol, and surfactant to obtain a mixed solution, and the mass ratio of the three is 1:8:1.

[0068] (5) Mix the functionalized graphite solution and the silver nitrate mixed s...

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Abstract

The invention provides a preparation method of a graphite-nano-silver composite solder paste sintering material. The method comprises the steps that a functionalized graphite water solution is prepared; silver ions are converted into elemental silver; and graphite-nano silver mixing and functionalization treatment are carried out, and the graphite-nano silver composite solder paste is obtained. According to the method, the cost price of the nano-silver solder paste is greatly reduced while the performance is ensured; and the particle agglomeration phenomenon of nano-silver is reduced by addingnano-graphite powder, and due to the high-temperature stability of nano-graphite, the silver electromigration occurence amount is reduced, cracks generated by silver electromigration are reduced, andthe joint strength of the graphite-nano-silver composite solder paste material can reach 15 Mpa or above.

Description

technical field [0001] The invention relates to the technical field of preparation of composite nanomaterials, in particular to a preparation method of a graphite-nano-silver composite solder paste sintered material. Background technique [0002] With the increasing demand in the electronics industry, electronic products are developing in the direction of light weight, thin thickness, small size, low power consumption, multiple functions, and high reliability. All these require that the power module can have excellent thermal conductivity, electrical conductivity and long-term working reliability no matter in the transient state or in the steady state. The reduced size of power modules results in increases in module and chip currents, terminal voltages, and input power. For this reason, high-power, high-temperature-resistant, and high-voltage-resistant electronic semiconductor devices, such as wide bandgap semiconductor devices such as diamond, gallium nitride, and silicon ...

Claims

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Application Information

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IPC IPC(8): B23K35/363B23K1/00
CPCB23K1/00B23K35/025B23K35/262B23K35/3601B23K2101/36
Inventor 陈静刘盼张靖叶怀宇张国旗
Owner SHENZHEN INST OF WIDE BANDGAP SEMICON