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A kind of surface metallized nano-carbon material composite nano-silver paste and preparation method thereof
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A nanomaterial, metallized carbon technology, applied in metal processing equipment, metal/alloy conductors, carbon-silicon compound conductors, etc., can solve the problems of sintered silver thermal conductivity, reduced thermal expansion coefficient, poor compatibility between nano silver and carbon nanomaterials, etc. , to achieve the effects of controllable reaction, excellent electrical and thermal conductivity, and uniform coating
Active Publication Date: 2021-06-08
深圳市先进连接科技有限公司
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[0007] The purpose of the present invention is to provide a surface metallized carbon nanomaterial composite nano-silver paste and its preparation method, aiming at solving the problem of poor compatibility between nano-silver and carbon nano-materials, and enhancing sintering by compounding nano-silver and carbon nano-materials Silver Conducts Thermal Conductivity and Reduces Thermal Expansion Coefficient
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Embodiment 1
[0028] Embodiment 1 A kind of surface metallized carbon nanomaterial composite nano-silver paste and preparation method thereof, comprising:
[0029] (1) Surface roughening, cleaning and centrifugation of carbon nanotubes with an average length of 1 μm, ultrasonic dispersion in ethylene glycol solution to obtain mixture A, with a solid content of 1 wt%, wherein the roughening solution is a concentrated solution with a volume ratio of 5:1 A mixed solution of sulfuric acid and concentrated hydrochloric acid.
[0030] (2) Dissolve silver nitrate and sodium citrate in ethylene glycol solution, wherein the concentration of silver nitrate and sodium citrate is 0.5mol / L respectively, the concentration of dispersant is 1mol / L, and the mixed solution is mixed according to the volume of 1:1 Mix with mixture A to obtain mixture B.
[0031] (3) The mixture B was placed in a reaction vessel, and reacted through a microfluidic system with a diameter of 100 μm, a reaction temperature of 180...
Embodiment 2
[0033] Embodiment 2 A kind of surface metallized carbon nanomaterial composite nano-silver paste and preparation method thereof, comprising:
[0034] (1) Surface roughening, cleaning and centrifugation of graphene with an average radial width of 2 μm, ultrasonic dispersion in glycerol solution to obtain mixture A, with a solid content of 5wt%, wherein the roughening solution is a volume ratio of 3:1 A mixed solution of concentrated sulfuric acid and concentrated hydrochloric acid.
[0035] (2) Dissolve silver nitrate and sodium citrate in ethylene glycol solution, wherein the concentration of silver nitrate and sodium citrate is 0.2mol / L respectively, the concentration of dispersant is 0.4mol / L, and the mixed solution is mixed according to 3:1 The volume ratio is mixed with the mixture A to obtain the mixture B.
[0036] (3) The mixture B was placed in a reaction vessel, and reacted through a microfluidic system with a microfluidic diameter of 200 μm, a reaction temperature o...
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Abstract
The invention provides a surface metallized carbon nanomaterial composite nano-silver paste and a preparation method thereof. The preparation method comprises: S1 coarsening, cleaning and centrifuging the carbon nanomaterial and dispersing it in an organic solvent to obtain a mixture A; S2 dissolving the nitric acid Silver and dispersant are dissolved in an organic solvent, and then mixed with mixture A to obtain mixture B; S3 passes mixture B through a microfluidic system, and the reaction product is flocculated and centrifuged to obtain surface metallized carbon nanomaterials; S4 surface metallized carbon nanomaterials Ultrasonic dispersion with nano-silver particles in an organic solvent, followed by flocculation, centrifugation and mechanical stirring to obtain a composite solder paste. The invention realizes the surface metallization of carbon nanomaterials and uniform mixing with nano silver particles, solves the problem of incompatibility between carbon nano materials and nano silver materials, and improves the electrical and thermal conductivity of nano silver solder paste and the reliability of later service .
Description
technical field [0001] The invention relates to the technical field of electronic packaging, and relates to a preparation method of a composite silver paste that can be used for sintering, more specifically, a surface metallized nano-carbon material composite nano-silver paste and a preparation method thereof. Background technique [0002] The third-generation semiconductors represented by silicon carbide and gallium nitride have excellent electrical properties and are widely used in new energy vehicles, high-speed railways, deep space exploration and other fields. During the service process, the interconnection materials of semiconductor chips will be subjected to multiple tests from mechanical vibration, thermomechanical stress, high-density current and heat flow, etc. Traditional adhesives and solders can no longer meet the increasingly stringent reliability requirements. [0003] Nano-silver solder paste is regarded as the most potential new interconnect material because...
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