CN113416079A - Method for preparing graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering - Google Patents
Method for preparing graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering Download PDFInfo
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Abstract
The invention discloses a method for preparing a graphene reinforced non-metal-based composite material by combining step-by-step feeding and multiple pressure sintering, which comprises the steps of a, firstly, putting a graphene reinforcement into a ball milling tank, then adding a non-metal material and grinding balls, then adding a grinding aid into the ball milling tank for multiple times for ball milling until the raw materials are mixed into uniform paste, and drying the slurry after ball milling to prepare composite powder; b. and (3) treating the composite powder by more than two pressure sintering processes to obtain the graphene reinforced nonmetal-based composite material. The method has the advantages that the step-by-step feeding ball milling is adopted, then the pressure sintering treatment in various modes is carried out, the step-by-step feeding ball milling mode can enable the graphene to be uniformly dispersed in the base material, the dispersion efficiency is high, the dispersion stability is high, the graphene structure is not damaged, the problem that the graphene is easy to agglomerate is solved, and in the multiple sintering stage of the composite material, the sintering temperature can be effectively reduced, the energy consumption is reduced, and the mechanical property of the material is improved by adopting sintering technologies such as air pressure, heat and the like with lower temperature.
Description
Technical Field
The invention relates to the field of graphene reinforced nonmetal-based composite materials, in particular to a method for preparing a graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering.
Background
Graphene is a hexagonal two-dimensional carbon nanomaterial consisting of carbon atoms in sp2 hybridized orbitals, is the thinnest and firmest material in the world, and has the strength and elastic modulus of 125GPa and 1100GPa respectively. Due to the excellent performances of large specific surface area, high modulus, high strength and the like, the graphene can be used as a reinforcement of inorganic non-metallic materials and high polymer materials. However, since perfect graphene is a stable two-dimensional planar structure formed by the hybridization of carbon atoms via sp2, the inert surface structure brings difficulties to the stable existence of monolithic graphene and the dispersion of monolithic graphene in other solvents, thereby limiting the research, development and application of graphene and graphene-based composite materials. And the graphene has large specific surface area and high surface energy, excessive graphene inevitably forms clusters in the material, so that the graphene and a ceramic matrix cannot form a good contact interface, the microstructure of the graphene is damaged, the adsorption capacity of the graphene is reduced, and the excellent performance of the graphene is hindered, so that the improvement of the performance of the graphene reinforced composite material is influenced, and the improvement of the performance of the composite material is influenced.
The alumina ceramic material has excellent performances of high hardness, high strength, high temperature resistance, wear resistance, corrosion resistance and the like, and is widely applied to structural ceramics and wear-resistant elements. Poor fracture toughness limits the industrial applicability of alumina ceramic materials due to their inherent brittleness. Since graphene is a hexagonal two-dimensional carbon nanomaterial consisting of carbon atoms in sp2 hybridized orbitals, the graphene is the thinnest and firmest material in the world, and the strength and the elastic modulus of the graphene respectively reach 125GPa and 1100 GPa. Due to the excellent performances of large specific surface area, high modulus, high strength and the like, the graphene can be used as a good reinforcement of a ceramic material and is widely applied to strengthening and toughening of a ceramic matrix composite. However, there are some problems in the preparation of graphene reinforced alumina-based composites: first, the influence of graphene content: proper amount of graphene is uniformly distributed in the matrix material, so that microscopic pores in the ceramic material can be reduced, and the mechanical strength and toughness of the material are enhanced. The graphene has a large specific surface area and high surface energy, and excessive graphene inevitably forms clusters in the material, so that a good contact interface cannot be formed between the graphene and a ceramic matrix, the microstructure of the graphene is damaged, and the improvement of the performance of the composite material is influenced. Secondly, the preparation process problem is as follows: the traditional pressureless preparation needs higher sintering temperature to prepare high-density alumina ceramics, but the high temperature accelerates the diffusion of alumina grain boundaries, and the coarse microstructure can cause higher material porosity (porosity); while higher sintering temperatures require more energy to be consumed. Thirdly, the influence of the sintering system. The performance of the ceramic is greatly influenced by the size, when the sintering temperature is low, the ion diffusion is slow, all elements cannot be fully diffused in the crystal, and more holes exist in the grown crystal grains; when the sintering temperature is high, grains are easy to grow abnormally and have uneven structures, and pores between grain boundaries are difficult to discharge, so that the bonding strength is reduced. Therefore, the sintering schedule (sintering temperature, sintering pressure) has an important influence on the microstructure and performance of the material.
In conclusion, the existing graphene feeding mode causes easy agglomeration of graphene, so that the graphene and a ceramic matrix cannot form a good contact interface, the microstructure of the graphene is damaged, and the improvement of the performance of the composite material is influenced.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing a graphene reinforced non-metal matrix composite material by combining step-by-step feeding and multiple pressure sintering, which can solve the problems of easy aggregation of graphene caused by the existing feeding method and high porosity and energy consumption of the material caused by high temperature sintering.
The method for preparing the graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering comprises the following steps of: a. firstly, putting a graphene reinforcement into a ball milling tank, then adding a non-metallic material and milling balls, then adding a grinding aid into the ball milling tank for multiple times for ball milling until the raw materials are mixed into uniform paste, and drying the slurry after ball milling to obtain composite powder;
b. treating the composite powder by more than two pressure sintering processes to prepare the graphene reinforced non-metal-based composite material;
further, in the step b, the pressure sintering process comprises air pressure furnace sintering and hot isostatic pressing sintering;
further, in the step b, the composite powder is subjected to powder hydraulic forming and then is sintered in a pneumatic furnace, and finally is subjected to hot isostatic pressing sintering;
further, in the step a, the graphene reinforcement is added into a ball milling tank, then the non-metal material is added, and finally the grinding ball is added;
further, in the step a, grinding aid is added next time after ball milling is carried out for a period of time every time the grinding aid is added;
further, in the step a, the addition amount of the grinding aids is increased from small to large in turn according to times;
further, in the step a, the grinding aid is absolute ethyl alcohol, the non-metal material is alumina ceramic, and the grinding ball is a zirconia ball;
further, in the step a, the addition amount of the graphene is 0.1-4.5 wt% of the total amount of the graphene and the alumina;
further, in the step b, the pressure of powder hydraulic forming is 15-50 kN, and the processing time is 5-60 s; the sintering temperature of the air pressure furnace is 1300-1500 ℃, the pressure is 2-10 MPa, and the processing time is 0.5-3.0 h; the sintering temperature of hot isostatic pressing sintering treatment is 1300-1600 ℃, the pressure is 100-195 MPa, and the treatment time is 0.5-3.0 h;
further, the addition amount of the graphene is 1 wt% of the total amount of the graphene and the aluminum oxide. .
The invention has the beneficial effects that: the method for preparing the graphene reinforced nonmetal-based composite material by combining the step-by-step feeding and the multiple pressure sintering adopts the step-by-step feeding ball milling, and then the pressure sintering treatment in various modes is carried out, the graphene can be uniformly dispersed in a base material by the step-by-step feeding ball milling mode, the dispersion efficiency is high, the dispersion stability is high, the graphene structure is not damaged, the problem that the graphene is easy to agglomerate is solved, and in the multiple sintering stage of the composite material, the sintering temperature can be effectively reduced, the energy consumption is reduced, the mechanical property of the material is improved, and the requirements of industrial preparation can be met by adopting sintering technologies such as air pressure, heat and the like with lower temperature.
Detailed Description
The method for preparing the graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering comprises the following steps of: a. firstly, putting a graphene reinforcement into a ball milling tank, then adding a non-metallic material and milling balls, then adding a grinding aid into the ball milling tank for multiple times for ball milling until the raw materials are mixed into uniform paste, and drying the slurry after ball milling to obtain composite powder;
b. treating the composite powder by more than two pressure sintering processes to prepare the graphene reinforced non-metal-based composite material; preparing a graphene reinforced nonmetal-based composite material; the method comprises the steps of putting light graphene into a ball milling tank, adding a non-metal material and a grinding ball, adding a certain amount of grinding aid for ball milling for a certain time, and then adding a certain amount of grinding aid for ball milling for a certain time, wherein the steps are repeated until raw materials are mixed to form uniform paste. The good interface combination between the graphene and the non-metal material matrix material is ensured by adopting a step-by-step feeding method, the dispersion of the graphene in the non-metal material matrix is facilitated, the contact interface between the graphene and the non-metal material matrix is increased, the graphene can be uniformly dispersed in the matrix material, and graphene aggregates are hardly seen in the whole process. In the multiple sintering stage of the composite material, multiple sintering technologies such as air pressure, heat and the like with lower temperature are adopted, so that the sintering temperature can be effectively reduced, the energy consumption is reduced, and the mechanical property of the material is improved.
In this embodiment, the pressure sintering process is air pressure furnace sintering and hot isostatic pressing sintering; carrying out powder hydraulic forming on the composite powder, then carrying out sintering treatment on the composite powder by a pneumatic furnace, and finally carrying out hot isostatic pressing sintering treatment; compared with the mode of only adopting hot-pressing sintering treatment, hot pressing and hot isostatic pressing combined treatment, the treatment mode of adopting powder hydraulic forming, air pressure sintering and hot isostatic pressing sintering has obvious improvement on the relative density, the bending strength, the fracture toughness and the Vickers hardness of the product, and particularly has very remarkable effect on the aspect of fracture toughness and has the trend of increasing by times. That is, the product treated by the treatment modes of powder hydraulic forming, air pressure sintering and hot isostatic pressing sintering has higher relative density in mechanical property, higher bending strength and better fracture toughness than the product treated by other modes.
In the embodiment, in the step a, the graphene reinforcement is added into a ball milling tank, then the non-metallic material is added, and finally the grinding ball is added; preferably, graphene is added firstly, then a non-metal material is added, and finally a grinding ball is added, by utilizing the characteristics of small density and light weight of graphene, graphene is added firstly and is positioned in the non-metal material and the grinding ball, and grinding aids (solvents) are added in batches, so that the amount of the grinding aids added every time is not large, light-weight graphene powder is not suspended on the surface of the grinding aids (solvents), good interface combination between the graphene and a non-metal material base material is promoted, and the contact interface of the graphene powder on the non-metal material powder is increased.
In the embodiment, in the step a, grinding aid is added next time after ball milling is carried out for a period of time every time grinding aid is added, and in the step a, the adding amount of the grinding aid is increased from small to large; in operation, the grinding aid amount is prepared according to the dosage ratio, then the grinding aid is divided into a plurality of parts (at least 3 parts), and the parts are added into a ball milling tank in batches at different time periods. The grinding aid is absolute ethyl alcohol, and the non-metallic material is one of an inorganic non-metallic material and a high polymer material; the effect of adopting absolute ethyl alcohol is more excellent, and the addition amount of the graphene can influence the performance of the composite material, so the addition amount of the graphene is determined according to the type of the non-metal material.
In this embodiment, in step a, the grinding aid is absolute ethyl alcohol, the non-metallic material is alumina ceramic, and the grinding ball is a zirconia ball; according to the method, graphene powder and alumina powder (with micron-sized granularity) are used as raw materials, the graphene reinforced alumina ceramic matrix composite is prepared by adopting a sintering method after ball milling, and the bending strength, the fracture toughness and the hardness of the obtained composite are greatly improved. This strongly demonstrates that good dispersion of graphene is key to the preparation of graphene-reinforced alumina-based ceramics.
In this embodiment, in the step a, the addition amount of the graphene is 0.1 wt% to 4.5 wt% of the total amount of the graphene and the alumina; the addition amount of graphene also influences graphene/Al2O3Important factors of the mechanical property of the composite ceramic material. This is mainly because graphene is easily agglomerated and is not easily uniformly dispersed in the alumina-based ceramic material, and the graphene clusters are destructive defects for the ceramic material. The addition amount of 0.1-4.5 wt% of graphene can avoid the reduction of the mechanical property of the material caused by the agglomeration of the added graphene in the ceramic material.
In the embodiment, in the step b, the pressure of the powder hydraulic forming is 15-50 kN, and the processing time is 5-60 s; the sintering temperature of the air pressure furnace is 1300-1500 ℃, the pressure is 2-10 MPa, and the processing time is 0.5-3.0 h; the sintering temperature of hot isostatic pressing sintering treatment is 1300-1600 ℃, the pressure is 100-195 MPa, and the treatment time is 0.5-3.0 h. The addition amount of the graphene is 1 wt% of the total amount of the graphene and the aluminum oxide; the sintering temperature, pressure and the addition of graphene directly influence the mechanical properties of the prepared composite material.
Example one
The raw materials consist of the following materials in parts by weight: 1.0 wt% of graphene and 99.0 wt% of aluminum oxide, and the preparation method comprises the following steps: step (1): adding graphene into a ball milling tank, adding alumina powder, and then filling zirconia balls into the ball milling tank according to the mass ratio of the raw materials to the zirconia balls of 1: 2; step (2): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 6:1, and carrying out ball milling for 5 hours at the rotating speed of 90 rpm; and (3): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 6:1, and carrying out ball milling for 4 hours at the rotating speed of 90 rpm; and (4): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, and carrying out ball milling for 6 hours at the rotating speed of 90 rpm; and (5): anhydrous ethanol is added according to the following materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, stopping ball milling when the powder granularity is less than 0.5 mu m under the rotation speed of 90rpm, sieving slurry by using a 320-mesh sieve in a dust-free room, and then carrying out vacuum drying at 50 ℃, sieving by using a 80-mesh sieve and artificial granulation to obtain composite powder; placing the composite powder in powder hydraulic forming equipment, and maintaining the pressure for 5s under the pressure of 20 KN; step (7), placing the composite material subjected to the hydraulic forming treatment into a high-temperature vertical atmosphere pressure sintering furnace, and preserving heat for 0.5h at the temperature of 1300 ℃ and the pressure of 2 MPa; step (8), placing the composite material subjected to the air pressure sintering treatment into a hot isostatic pressing machine, and preserving heat for 0.5h at the temperature of 1300 ℃ and the pressure of 100 MPa; and preparing ceramic, and polishing the ceramic to obtain the graphene reinforced alumina ceramic matrix composite.
Example two
The raw materials consist of the following materials in parts by weight: 1.5 wt% of graphene and 98.5 wt% of alumina, and the preparation method comprises the following steps: step (1): adding graphene into a ball milling tank, adding alumina powder, and then filling zirconia balls into the ball milling tank according to the mass ratio of the raw materials to the zirconia balls being 1: 3; step (2): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 6:1, and carrying out ball milling for 4.5 hours at the rotating speed of 90 rpm; and (3): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 5:1, and carrying out ball milling for 4 hours at the rotating speed of 90 rpm; and (4): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 4:1, and carrying out ball milling for 5 hours at the rotating speed of 90 rpm; and (5): anhydrous ethanol is added according to the following materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, stopping ball milling when the powder granularity is less than 0.5 mu m under the rotation speed of 90rpm, sieving slurry by using a 320-mesh sieve in a dust-free room, and then carrying out vacuum drying at 50 ℃, sieving by using a 80-mesh sieve and artificial granulation to obtain composite powder; placing the composite powder in powder hydraulic forming equipment, and maintaining the pressure for 60s under the pressure of 50 KN; step (7), placing the composite material subjected to the hydraulic forming treatment into a high-temperature vertical atmosphere pressure sintering furnace, and preserving heat for 3 hours at the temperature of 1500 ℃ and the pressure of 10 MPa; step (8), placing the composite material subjected to air pressure sintering treatment into a hot isostatic pressing machine, and preserving heat for 3 hours at the temperature of 1600 ℃ and the pressure of 195 MPa; and preparing ceramic, and polishing the ceramic to obtain the graphene reinforced alumina ceramic matrix composite.
EXAMPLE III
The raw materials consist of the following materials in parts by weight: 0.1 wt% of graphene and 99.9 wt% of aluminum oxide, and the preparation method comprises the following steps: step (1): adding graphene into a ball milling tank, adding alumina powder, and then filling zirconia balls into the ball milling tank according to the mass ratio of the raw materials to the zirconia balls being 1: 4; step (2): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 8:1, and carrying out ball milling for 4 hours at the rotating speed of 100 rpm; and (3): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 6:1, and carrying out ball milling for 3 hours at the rotating speed of 100 rpm; and (4): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 5:1, and carrying out ball milling for 3 hours at the rotating speed of 100 rpm; and (5): anhydrous ethanol is added according to the following materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, stopping ball milling when the powder granularity is less than 0.5 mu m under the rotation speed of 100rpm, sieving slurry by using a 320-mesh sieve in a dust-free room, and then carrying out vacuum drying at 50 ℃, sieving by using a 80-mesh sieve and artificial granulation to obtain composite powder;
placing the composite powder in powder hydraulic forming equipment, and maintaining the pressure for 15s under the pressure of 20 KN; step (7), placing the composite material subjected to the hydraulic forming treatment into a high-temperature vertical atmosphere pressure sintering furnace, and preserving heat for 1h at the temperature of 1400 ℃ and the pressure of 10 MPa; step (8) placing the composite material subjected to air pressure sintering treatment into a hot isostatic pressing machine, and preserving heat for 1.5 hours at the temperature of 1480 ℃ and under the pressure of 130 MPa; and preparing ceramic, and polishing the ceramic to obtain the graphene reinforced alumina ceramic matrix composite.
Example four
The raw materials consist of the following materials in parts by weight: 3.0 wt% of graphene and 97.0 wt% of alumina, and the preparation method comprises the following steps: step (1): adding graphene into a ball milling tank, adding alumina powder, and then filling zirconia balls into the ball milling tank according to the mass ratio of the raw materials to the zirconia balls being 1: 4; step (2): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 7:1, and carrying out ball milling for 4 hours at the rotating speed of 110 rpm; and (3): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 6:1, and carrying out ball milling for 4 hours at the rotating speed of 110 rpm; and (4): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, and carrying out ball milling for 4 hours at the rotating speed of 110 rpm; and (5): anhydrous ethanol is added according to the following materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 3:1, stopping ball milling when the powder granularity is less than 0.5 mu m under the rotation speed of 110rpm, sieving slurry by using a 320-mesh sieve in a dust-free room, and then carrying out vacuum drying at 60 ℃, sieving by using a 90-mesh sieve and artificial granulation to obtain composite powder; placing the composite powder in powder hydraulic forming equipment, and maintaining the pressure for 40s under the pressure of 30 KN; step (7), putting the composite material subjected to the hydraulic forming treatment into a high-temperature vertical atmosphere pressure sintering furnace, and preserving heat for 1h at 1450 ℃ and 5 MPa; step (8), placing the composite material subjected to air pressure sintering treatment into a hot isostatic pressing machine, and preserving heat for 1h at the temperature of 1430 ℃ and the pressure of 160 MPa; and preparing ceramic, and polishing the ceramic to obtain the graphene reinforced alumina ceramic matrix composite.
EXAMPLE five
The raw materials consist of the following materials in parts by weight: 2.0 wt% of graphene and 98.0 wt% of alumina, and the preparation method comprises the following steps: step (1): adding graphene into a ball milling tank, adding alumina powder, and then filling zirconia balls into the ball milling tank according to the mass ratio of the raw materials to the zirconia balls of 1: 2; step (2): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 5:1, and carrying out ball milling for 6 hours at the rotating speed of 80 rpm; and (3): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 5:1, and carrying out ball milling for 7 hours at the rotating speed of 80 rpm; and (4): anhydrous ethanol is prepared according to the following raw materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 4:1, and carrying out ball milling for 6 hours at the rotating speed of 80 rpm; and (5): anhydrous ethanol is added according to the following materials: adding absolute ethyl alcohol into a ball milling tank according to the mass ratio of 2:1, stopping ball milling when the powder granularity is less than 0.5 mu m under the rotation speed of 80rpm, sieving slurry by using a 320-mesh sieve in a dust-free room, and then carrying out vacuum drying at 55 ℃, sieving by using a 70-mesh sieve and artificial granulation to obtain composite powder; placing the composite powder in powder hydraulic forming equipment, and maintaining the pressure for 50s under the pressure of 40 KN; step (7), placing the composite material subjected to the hydraulic forming treatment into a high-temperature vertical atmosphere pressure sintering furnace, and preserving heat for 1.2 hours at the temperature of 1370 ℃ and under the pressure of 6.5 MPa; step (8), placing the composite material subjected to the air pressure sintering treatment into a hot isostatic pressing machine, and preserving heat for 1.2 hours at the temperature of 1430 ℃ and the pressure of 180 MPa; and preparing ceramic, and polishing the ceramic to obtain the graphene reinforced alumina ceramic matrix composite.
The ceramic materials of the first to fifth embodiments are subjected to mechanical property tests, the test method adopts the conventional mechanical property test method, and the results are as follows:
finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A method for preparing a graphene reinforced nonmetal-based composite material by combining step-by-step feeding and multiple pressure sintering is characterized by comprising the following steps of: the method comprises the following steps: a. firstly, putting a graphene reinforcement into a ball milling tank, then adding a non-metallic material and milling balls, then adding a grinding aid into the ball milling tank for multiple times for ball milling until the raw materials are mixed into uniform paste, and drying the slurry after ball milling to obtain composite powder;
b. and (3) treating the composite powder by more than two pressure sintering processes to obtain the graphene reinforced nonmetal-based composite material.
2. The method for preparing the graphene reinforced nonmetal-based composite material by combining the step feeding and the multiple pressure sintering according to claim 1, which is characterized in that: in the step b, the pressure sintering process comprises air pressure furnace sintering and hot isostatic pressing sintering.
3. The method for preparing the graphene reinforced nonmetal-based composite material by combining the step feeding and the multiple pressure sintering according to claim 2, characterized in that: and in the step b, the composite powder is subjected to powder hydraulic forming and then is sintered in a pneumatic furnace, and finally is subjected to hot isostatic pressing sintering.
4. The method for preparing the graphene reinforced nonmetal-based composite material by combining the step feeding and the multiple pressure sintering according to claim 1, which is characterized in that: in the step a, the graphene reinforcement is added into a ball milling tank, then the non-metal material is added, and finally the grinding ball is added.
5. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 4, wherein: in the step a, grinding aid is added next time after ball milling is carried out for a period of time every time the grinding aid is added.
6. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 5, wherein: in the step a, the addition amount of the grinding aid is increased from small to large in turn according to times.
7. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 6, wherein: in the step a, the grinding aid is absolute ethyl alcohol, the non-metal material is alumina ceramic, and the grinding ball is a zirconia ball.
8. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 7, wherein: in the step a, the addition amount of the graphene is 0.1-4.5 wt% of the total amount of the graphene and the aluminum oxide.
9. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 6, wherein: in the step b, the pressure of powder hydraulic forming is 15-50 kN, and the processing time is 5-60 s; the sintering temperature of the air pressure furnace is 1300-1500 ℃, the pressure is 2-10 MPa, and the processing time is 0.5-3.0 h; the sintering temperature of hot isostatic pressing sintering treatment is 1300-1600 ℃, the pressure is 100-195 MPa, and the treatment time is 0.5-3.0 h.
10. The method for improving the dispersibility of graphene reinforcement in a non-metallic material matrix according to claim 9, wherein: the addition amount of the graphene is 1 wt% of the total amount of the graphene and the aluminum oxide.
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