Graphene reinforcement-based indium-tin alloy composite material and preparation process thereof

Abstract

The invention discloses a preparation process of an indium-tin alloy composite material based on graphene enhancement, which comprises the following steps: A) dissolving graphene in an organic solvent, and preparing a graphene dispersion solution by using an ultrasonic dispersion instrument, B) adding indium-tin alloy powder into the graphene dispersion solution; c) putting the graphene dispersion solution added with the indium-tin alloy powder into a ball mill for ball milling; d) drying the ball-milled solution by a spray dryer to obtain mixed powder of graphene and indium-tin alloy; e) placing the mixed powder in a mold for cold press molding to obtain a cold press block; and F) sintering the cold-pressed block in a furnace in an argon atmosphere, and performing air cooling after sintering to obtain the graphene-reinforced indium-tin alloy composite material. The graphene can be uniformly dispersed into the indium-tin alloy powder, so that the firmness degree of combination between the graphene and the indium-tin alloy powder is realized, and the comprehensive performance of the composite material is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a graphene-enhanced indium-tin alloy composite material and a preparation process thereof. Background Art

[0002] Graphene is a new type of two-dimensional atomic crystal composed of a single atomic layer of carbon atoms bonded by sp2 hybridization. Graphene has a series of properties such as high strength, high thermal conductivity, high transparency, almost zero bandgap, Young's modulus and fracture strength comparable to carbon nanotubes. Based on its excellent properties, graphene has become an ideal material for reinforcing metal-based composites. Indium tin alloy is an alloy composed of two metal elements, indium and tin, with good thermal conductivity and electrical conductivity, excellent corrosion resistance and oxidation resistance. As a rare metal alloy, indium tin alloy has a relatively high price and insufficient production output, which to a certain extent limits its wide application. At present, when preparing alloy composites based on graphene reinforcement, the dispersion of graphene in the alloy is poor, and the bonding force between the two is low, which greatly reduces the comprehensive performance of the composite material. Summary of the invention

[0003] The object of the present invention is to provide an indium-tin alloy composite material based on graphene enhancement and a preparation process thereof, so as to solve the problems existing in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a preparation process of an indium-tin alloy composite material enhanced by graphene, comprising the following steps:

[0005] A) dissolving graphene in an organic solvent and preparing a graphene dispersion solution by using an ultrasonic disperser, wherein the weight ratio of graphene to the organic solvent is 1:(15-20), the concentration of the organic solvent is 30-80%, and the organic solvent is ethanol, isopropanol or N-methylpyrrolidone;

[0006] B) adding indium tin alloy powder to the graphene dispersion solution, wherein the weight of the graphene is 1-2% of the weight of the indium tin alloy powder;

[0007] C) placing the graphene dispersion solution added with the indium tin alloy powder in a ball mill for ball milling, the ball milling time is 10-25 hours, and the ball mill speed is 300-500 r / min;

[0008] D) drying the ball-milled solution using a spray dryer to obtain a mixed powder of graphene and indium tin alloy;

[0009] E) placing the mixed powder in a mold for cold pressing to obtain a cold pressed block;

[0010] F) placing the cold pressed block in a furnace in an argon atmosphere for sintering at a sintering temperature of 1000-1200° C., a sintering time of 1-2 hours, and heat preservation for 2-3 hours, followed by air cooling to obtain a graphene-enhanced indium-tin alloy composite material.

[0011] Preferably, the drying temperature in step D) is 80-90° C. and the drying time is 2-4 hours.

[0012] Preferably, the particle size of the indium tin alloy powder is 20-30 μm.

[0013] The present invention also provides a graphene-enhanced indium-tin alloy composite material, which is prepared by the above-mentioned preparation process.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention dissolves graphene in an organic solvent, disperses it using an ultrasonic disperser, and improves the dispersibility of the graphene through ball milling. The graphene can be evenly dispersed in the indium tin alloy powder, and the mixed powder is cold-pressed and sintered in a furnace in an argon atmosphere, thereby improving the density of the combination of the two, achieving a firm combination between the graphene and the indium tin alloy powder, and improving the comprehensive performance of the composite material. DETAILED DESCRIPTION

[0015] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example 1

[0017] The preparation process of the graphene-enhanced indium-tin alloy composite material comprises the following steps:

[0018] A) dissolving graphene in an organic solvent and preparing a graphene dispersion solution by using an ultrasonic disperser, wherein the weight ratio of graphene to the organic solvent is 1:15, 10 g of graphene is taken, and the amount of the organic solvent is 150 g, the concentration of the organic solvent is 80%, and the organic solvent is isopropanol.

[0019] B) adding indium tin alloy powder to the graphene dispersion solution, wherein the particle size of the indium tin alloy powder is 30 μm, and the weight of the graphene is 1% of the weight of the indium tin alloy powder, that is, the weight of the indium tin alloy powder is 1000 g.

[0020] C) placing the graphene dispersion solution with indium tin alloy powder in a ball mill for ball milling for 20 hours at a speed of 300 r / min;

[0021] D) drying the ball-milled solution using a spray dryer at a temperature of 80° C. for 4 h to obtain a mixed powder of graphene and indium tin alloy;

[0022] E) placing the mixed powder in a mold for cold pressing to obtain a cold pressed block;

[0023] F) placing the cold pressed block in an argon atmosphere furnace for sintering at a sintering temperature of 1200° C. for 1 hour and keeping the temperature for 3 hours, followed by air cooling to obtain a graphene-enhanced indium-tin alloy composite material.

[0024] The tensile strength of the graphene-enhanced indium-tin alloy composite material obtained by the above-mentioned preparation process is 347.85 MPa, and the yield strength is 287.32 MPa, which are increased by 34.32% and 41.33% compared with other alloys under the same conditions.

[0025] Example 2

[0026] The preparation process of the graphene-enhanced indium-tin alloy composite material comprises the following steps:

[0027] A) dissolving graphene in an organic solvent and preparing a graphene dispersion solution by using an ultrasonic disperser, wherein the weight ratio of graphene to the organic solvent is 1:20, 5 g of graphene is taken, the organic solvent is 100 g, the concentration of the organic solvent is 30%, and the organic solvent is N-methylpyrrolidone;

[0028] B) Indium tin alloy powder is added to the graphene dispersion solution, wherein the particle size of the indium tin alloy powder is 20 μm and the weight of the graphene is 2% of the weight of the indium tin alloy powder, that is, the weight of the indium tin alloy powder is 250 g.

[0029] C) placing the graphene dispersion solution with indium tin alloy powder in a ball mill for ball milling for 10 h at a speed of 500 r / min;

[0030] D) drying the ball-milled solution using a spray dryer at a temperature of 90° C. for 2 h to obtain a mixed powder of graphene and indium tin alloy;

[0031] E) placing the mixed powder in a mold for cold pressing to obtain a cold pressed block;

[0032] F) placing the cold pressed block in an argon atmosphere furnace for sintering at a sintering temperature of 1000° C. for 2 h and keeping the temperature for 2.5 h, followed by air cooling to obtain a graphene-enhanced indium-tin alloy composite material.

[0033] The tensile strength of the graphene-reinforced indium-tin alloy composite material obtained by the above-mentioned preparation process is 321.54 MPa, and the yield strength is 296.68 MPa, which are increased by 38.12% and 43.65% compared with other alloys under the same conditions.

[0034] Example 3

[0035] The preparation process of the graphene-enhanced indium-tin alloy composite material comprises the following steps:

[0036] A) dissolving graphene in an organic solvent and preparing a graphene dispersion solution by using an ultrasonic disperser, wherein the weight ratio of graphene to organic solvent is 1:16, the concentration of organic solvent is 50%, 15 g of graphene is taken, and the amount of organic solvent is 240 g, and the organic solvent is ethanol.

[0037] B) Indium tin alloy powder is added to the graphene dispersion solution, the particle size of the indium tin alloy powder is 25 μm, and the weight of the graphene is 1.5% of the weight of the indium tin alloy powder, that is, the weight of the indium tin alloy powder is 1000 g.

[0038] C) placing the graphene dispersion solution with indium tin alloy powder in a ball mill for ball milling for 20 hours at a speed of 400 r / min;

[0039] D) drying the ball-milled solution using a spray dryer at a temperature of 85° C. for 3 h to obtain a mixed powder of graphene and indium tin alloy;

[0040] E) placing the mixed powder in a mold for cold pressing to obtain a cold pressed block;

[0041] F) The cold pressed block is placed in a furnace in an argon atmosphere for sintering at a temperature of 1,100° C. for 1.5 h and kept at this temperature for 2 h, followed by air cooling to obtain a graphene-enhanced indium-tin alloy composite material.

[0042] The tensile strength of the graphene-enhanced indium-tin alloy composite material obtained by the above-mentioned preparation process is 303.28 MPa, and the yield strength is 231.79 MPa, which are increased by 32.7% and 35.86% compared with other alloys under the same conditions.

Claims

1. A process for preparing a graphene-enhanced indium-tin alloy composite material, characterized in that: The following steps are involved: A) dissolving graphene in an organic solvent and preparing a graphene dispersion solution by using an ultrasonic disperser, wherein the weight ratio of graphene to the organic solvent is 1:(15-20), the concentration of the organic solvent is 30-80%, and the organic solvent is ethanol, isopropanol or N-methylpyrrolidone; B) adding indium tin alloy powder to the graphene dispersion solution, wherein the weight of the graphene is 1-2% of the weight of the indium tin alloy powder; C) placing the graphene dispersion solution added with the indium tin alloy powder in a ball mill for ball milling, the ball milling time is 10-25 hours, and the ball mill speed is 300-500 r / min; D) drying the ball-milled solution using a spray dryer to obtain a mixed powder of graphene and indium tin alloy; E) placing the mixed powder in a mold for cold pressing to obtain a cold pressed block; F) placing the cold pressed block in a furnace in an argon atmosphere for sintering at a sintering temperature of 1000-1200° C., a sintering time of 1-2 hours, and heat preservation for 2-3 hours, followed by air cooling to obtain a graphene-enhanced indium-tin alloy composite material.

2. The process for preparing the graphene-enhanced indium-tin alloy composite material according to claim 1, characterized in that: The drying temperature of step D) is 80-90° C. and the drying time is 2-4 hours.

3. The process for preparing the graphene-enhanced indium-tin alloy composite material according to claim 1, characterized in that: The particle size of the indium tin alloy powder is 20-30 μm.

4. A graphene-enhanced indium-tin alloy composite material, characterized in that: The method is prepared by the preparation process described in any one of claims 1 to 3.