CN105714138A - Method for preparing graphene reinforced copper-based composite material - Google Patents
Method for preparing graphene reinforced copper-based composite material Download PDFInfo
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Abstract
The invention relates to a method for preparing a graphene reinforced copper-based composite material, and aims at solving a technical problem that graphene is poor in dispersibility and is easy to agglomerate by adopting an existing method for preparing the graphene reinforced copper-based composite material. The method disclosed by the invention comprises the following steps: I, preparing graphene oxide; II, performing surface modification of copper powder; III, preparing graphene oxide-copper composite powder; and IV, preparing the graphene reinforced copper-based composite material. According to the method disclosed by the invention, the graphene is effectively dispersed into a copper matrix evenly by an electrostatic self-assembly method, and thus, damage generated to the size of the graphene and a work hardening phenomenon generated on the copper matrix by treatment of a ball-milling method are avoided, the phenomenon that the graphene is agglomerated is prevented, and mechanical property of the composite material is obviously increased; tensile strength of the graphene reinforced copper-based composite material is increased by 5 percent to 12 percent and hardness is increased by 5 percent to 20 percent in comparison with a pure copper material; and meanwhile, the copper-based composite material is increased by 5 percent to 10 percent in heat-conducting property in comparison with the pure copper material.
Description
Technical field
The present invention relates to a kind of method preparing Graphene enhancing Cu-base composites.
Background technology
Cu-base composites is because good heat conduction and processing characteristics make it be with a wide range of applications at automobile, Aero-Space and electronic applications.Although but traditional fiber and reinforced particulate can increase the mechanical property of material, but often making its heat conductivility reduce.Therefore, research and development have excellent heat conductivity performance and the most also have the Cu-base composites of high intensity and become the problem needing solution at present badly.
Graphene be a kind of by carbon atom with sp2The hexangle type of hybrid orbital composition is honeycomb lattice, the two-dimensional material of only one of which carbon atom thickness.In recent years because of its high Young's modulus (1TPa), high fracture strength (125GPa) and super-high heat-conductive coefficient (5000W m-1•K-1) cause greatly concern.Compared to CNT, the two-dimensional structure of Graphene makes Graphene relatively be easier to control and be dispersed in Copper substrate, therefore give full play to the reinforced effects of Graphene, prepare high performance Graphene enhancing Cu-base composites and caused the concern of more and more researcher.
But about Graphene strengthen Cu-base composites research at the early-stage, the research of up to the present Graphene enhancing Cu-base composites does not make a breakthrough, this is primarily due to Graphene and has the biggest specific surface area, and surface can be high, has stronger reunion tendency.Therefore, during preparing Graphene enhancing Cu-base composites, graphene uniform is dispersed in Copper substrate by crucial step exactly.Ball-milling method is the main method of graphene dispersion at present, Graphene is mainly mixed so that graphene dispersion is in copper powder with copper powder ball milling by it, prepare Graphene by powder metallurgy afterwards and strengthen Cu-base composites, although ball-milling method can realize producing on a large scale, but mechanical milling process can not effective being dispersed in graphene uniform in Copper substrate, mechanical milling process can damage and cause Copper substrate processing hardening to the size of Graphene simultaneously, weakens strengthening effect and the heat conductivility of Graphene.
Summary of the invention
The graphene dispersion that the invention aims to solve the existing method existence preparing Graphene enhancing Cu-base composites is poor, the technical problem easily reunited, and provides a kind of and prepare the method that Graphene strengthens Cu-base composites.
A kind of method preparing Graphene enhancing Cu-base composites of the present invention is carried out according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 30 DEG C ~ 40 DEG C 1h，Then under conditions of temperature is 30 DEG C ~ 40 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 85 DEG C ~ 95 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: copper powder is joined in the CTAB solution that mass fraction is 1%, ultrasonic disperse 20min ~ 60min, then magnetic agitation 1h ~ 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；The weight of described copper powder and mass fraction be the volume ratio of the CTAB solution of 1% be 1g:(1mL ~ 2mL)；
Three, graphene oxide-copper composite powder is prepared: the copper powder of modification 100g step 2 obtained joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.1g ~ 0.5g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 1h ~ 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
Being dispersed in metallic matrix of graphene uniform is effectively made graphene dispersion evenly by the method for present invention electrostatic self-assembled, to the destruction of Graphene size and processing hardening phenomenon that Copper substrate is produced simultaneously when avoiding ball-milling treatment, prevent the generation of Graphene agglomeration, and significantly improve the mechanical property of material, improve 10% ~ 20% compared to the tensile strength of pure copper material, hardness improves 10% ~ 30%.The heat conductivility of Cu-base composites improves 5%-10% compared to fine copper simultaneously.
CTAB is cetyl trimethylammonium bromide, cetyl trimethylammonium bromide is a kind of quaternary ammonium salt cationic surfactant, containing hydrophobic Long carbon chain and the polar end of positively charged, in the present invention when, in the aqueous solution that copper powder joins cetyl trimethylammonium bromide, lammonium bromide can adsorb makes its surface with positive charge at Copper Powder Surface.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the graphene oxide of preparation in test one step one；
Fig. 2 is the XRD figure of graphene oxide and graphite.Curve 1 is the graphene oxide of preparation in test one step one, and curve 2 is the graphite powder in test one step one；
Fig. 3 is the FT-IR figure of the graphene oxide of preparation in test one step one；
Fig. 4 is the SEM figure of graphene oxide-copper composite powder prepared by test four step 3；
Fig. 5 is the tensile strength figure of the Graphene enhancing Cu-base composites of different quality mark；
Fig. 6 is the Vickers hardness figure of the Graphene enhancing Cu-base composites of different quality mark；
Fig. 7 is the heat conductivility figure of the Graphene enhancing Cu-base composites of different quality mark.
Detailed description of the invention
Detailed description of the invention one: present embodiment is a kind of method preparing Graphene enhancing Cu-base composites, carries out the most according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 30 DEG C ~ 40 DEG C 1h，Then under conditions of temperature is 30 DEG C ~ 40 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 85 DEG C ~ 95 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: copper powder is joined in the CTAB solution that mass fraction is 1%, ultrasonic disperse 20min ~ 60min, then magnetic agitation 1h ~ 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；The weight of described copper powder and mass fraction be the volume ratio of the CTAB solution of 1% be 1g:(1mL ~ 2mL)；
Three, graphene oxide-copper composite powder is prepared: the copper powder of modification 100g step 2 obtained joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.1g ~ 0.5g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 1h ~ 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
Detailed description of the invention two: the present embodiment difference from detailed description of the invention one is: the mass concentration of the concentrated sulphuric acid described in step one is 98%.Other are identical with detailed description of the invention one.
Detailed description of the invention three: the present embodiment difference from detailed description of the invention one or two is: the weight of the copper powder described in step 2 and mass fraction be the volume ratio of the CTAB solution of 1% be 1g:1mL.Other are identical with detailed description of the invention one or two.
Detailed description of the invention four: the present embodiment difference from detailed description of the invention one to three is: weigh graphene oxide 0.3g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains in step 3, obtain graphene oxide aqueous dispersion.Other are identical with detailed description of the invention one to three.
Detailed description of the invention five: the present embodiment difference from detailed description of the invention one to four is: graphene oxide-copper composite powder step 3 prepared in step 4 joins in the mould that material is graphite; 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites.Other are identical with detailed description of the invention one to four.
By tests below checking beneficial effects of the present invention:
Test one: this test is contrast test, prepares fine copper, method particularly includes:
Copper powder is joined in the mould that material is graphite, under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C, sinter 1h ~ 2h, naturally cool to room temperature, obtain fine copper；The die surface of described graphite scribbles boron nitride impervious barrier.
Test two: a kind of method preparing Graphene enhancing Cu-base composites, is carried out the most according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 35 DEG C 1h，Then under conditions of temperature is 35 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 90 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: 100g copper powder is joined in the CTAB solution that 100mL mass fraction is 1%, ultrasonic disperse 40min, then magnetic agitation 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；
Three, graphene oxide-copper composite powder is prepared: the copper powder of modification 100g step 2 obtained joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.1g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
The mass concentration of the concentrated sulphuric acid described in step one is 98%.
Test three: a kind of method preparing Graphene enhancing Cu-base composites, is carried out the most according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 35 DEG C 1h，Then under conditions of temperature is 35 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 90 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: 100g copper powder is joined in the CTAB solution that 100mL mass fraction is 1%, ultrasonic disperse 40min, then magnetic agitation 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；
Three, graphene oxide-copper composite powder is prepared: the copper powder of modification 100g step 2 obtained joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.3g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
The mass concentration of the concentrated sulphuric acid described in step one is 98%.
Test four: a kind of method preparing Graphene enhancing Cu-base composites, is carried out the most according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 35 DEG C 1h，Then under conditions of temperature is 35 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 90 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: 100g copper powder is joined in the CTAB solution that 100mL mass fraction is 1%, ultrasonic disperse 40min, then magnetic agitation 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；
Three, graphene oxide-copper composite powder is prepared: the copper powder of modification 100g step 2 obtained joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.5g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
The mass concentration of the concentrated sulphuric acid described in step one is 98%.
Fig. 1 is the SEM figure of the graphene oxide of preparation in test one step one, as can be seen from the figure this test uses Hummers method to prepare a large amount of large-sized graphene oxide, the graphene oxide of preparation is transparent, shows that this method can obtain that the number of plies is less and large-sized graphene oxide.
Fig. 2 is the XRD figure of graphene oxide and graphite, curve 1 is the graphene oxide of preparation in test one step one, curve 2 is the graphite powder in test one step one, can be seen that graphite powder is after Hummers method processes, because the embedding of group makes sheet interlayer spacing open, simultaneously as the graphene oxide degree of crystallinity that the existence of group makes preparation declines, defect increases.
Fig. 3 be test one step one in preparation graphene oxide FT-IR collection of illustrative plates, as can be seen from the figure graphene oxide is 3410cm in wave number-1Near have an obvious absworption peak, the OH stretching vibration of hydroxyl in graphene oxide structure should be belonged to；In figure, wave number is 2920cm-1And 2850cm-1Peak, place is respectively belonging to CH2Antisymmetry, symmetrical stretching vibration peak；1737cm-1The absworption peak of position should belong to carbonyl or the stretching vibration peak of carboxyl (C=O)；Wave number is 1638cm-1Neighbouring absworption peak belongs to the stretching vibration of C=C；Wave number is 1397cm-1Neighbouring peak belongs to the OH deformation vibration of hydroxyl in structure；Wave number is 1060cm-1Neighbouring peak belongs to the stretching vibration of epoxide group (C-O-C).Just because of the existence of above-mentioned polar group, test the graphene oxide of step one preparation the most sonicated after, graphene oxide is with the strongest negative charge.
Fig. 4 is the SEM figure of graphene oxide-copper composite powder prepared by test four step 3, and as can be seen from the figure graphene oxide is mainly coated on copper powder particle surface and does not has obvious agglomeration to occur.
Fig. 5 is that the Graphene of different quality mark strengthens Cu-base composites and the tensile strength figure of fine copper, the mass fraction of Graphene be 0 be test one preparation fine copper, the mass fraction of Graphene be 0.1% be test two preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.3% be test three preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.5% be test four preparation Graphenes strengthen Cu-base composites.As can be seen from the figure, when the mass fraction of Graphene is 0.3wt%, Graphene strengthens the tensile strength of Cu-base composites and reaches maximum.
Fig. 6 is the Vickers hardness figure of the Graphene enhancing Cu-base composites of different quality mark, the mass fraction of Graphene be 0 be test one preparation fine copper, the mass fraction of Graphene be 0.1% be test two preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.3% be test three preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.5% be test four preparation Graphenes strengthen Cu-base composites.It can be seen that along with the increase of Graphene content, the Vickers hardness of Graphene enhancing Cu-base composites presents first increases the trend reduced afterwards.The fine copper hardness using identical hot-pressing sintering technique to prepare is 27 HV, and the Vickers hardness that the Graphene testing 0.3 wt% of three preparations strengthens Cu-base composites is 35 HV, improves 30 % compared to fine copper；When the addition of Graphene reaches 0.5 wt%(test four preparation) time, Graphene strengthens the Vickers hardness of Cu-base composites and begins to decline, this is primarily due to Graphene too high levels, binding ability between copper powder particle is caused to decline, composite mesopore is increased so that declining occurs in the hardness number of composite.
Fig. 7 is that the Graphene of different quality mark strengthens Cu-base composites heat conductivility figure.The mass fraction of Graphene be 0 be test one preparation fine copper, the mass fraction of Graphene be 0.1% be experiment two preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.3% be test three preparation Graphenes strengthen Cu-base composites, the mass fraction of Graphene be 0.5% be test four preparation Graphenes strengthen Cu-base composites.As can be seen from the figure, when the mass fraction of Graphene is 0.3%, Graphene strengthens the heat conductivility of Cu-base composites and reaches to be 396W m to the maximum-1∙K-1。
Claims (5)
1. prepare the method that Graphene strengthens Cu-base composites for one kind, it is characterised in that the method preparing Graphene enhancing Cu-base composites is carried out according to the following steps:
nullOne、Prepare graphene oxide: under conditions of ice-water bath, in the conical flask equipped with the concentrated sulphuric acid of 46mL, add 1g graphite powder and 1g sodium nitrate，Mix and blend 20min under conditions of ice-water bath，6g potassium permanganate is added under conditions of ice-water bath，Stirring 40min，Obtain the mixed liquor of green purple，The mixed liquor of green purple is incubated under conditions of temperature is 30 DEG C ~ 40 DEG C 1h，Then under conditions of temperature is 30 DEG C ~ 40 DEG C, add the distilled water of 40mL，30min it is incubated under conditions of temperature is 85 DEG C ~ 95 DEG C，Obtain brown mixture，The distilled water of 100mL and the hydrogen peroxide of 6mL is added at ambient temperature in brown mixture，Obtain jonquilleous mixed liquor，Then it is 6 ~ 7 with the hydrochloric acid solution that mass concentration is 3% and the jonquilleous mixed liquor of distilled water cyclic washing to pH，Filter，Lyophilization 12h，Obtain electronegative graphene oxide；
Two, the surface modification of copper powder: copper powder is joined in the CTAB solution that mass fraction is 1%, ultrasonic disperse 20min ~ 60min, then magnetic agitation 1h ~ 2h, with distilled water wash, filter, obtain the positively charged copper powder that CTAB modifies；The weight of described copper powder and mass fraction be the volume ratio of the CTAB solution of 1% be 1g:(1mL ~ 2mL)；
Three, graphene oxide-copper composite powder is prepared: the copper powder that CTAB 100g step 2 obtained modifies joins in the distilled water of 100mL, is stirred at room temperature 30min, obtains copper powder suspension；Weigh graphene oxide 0.1g ~ 0.5g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains, obtain graphene oxide aqueous dispersion；Graphene oxide aqueous dispersion is joined stirring mixed liquor in copper powder suspension, making electronegative graphene oxide be adsorbed onto positively charged Copper Powder Surface by electrostatic attraction, stirring to mixed liquor color is water white transparency, filters, lyophilization 8h, obtains graphene oxide-copper composite powder；
Four, Graphene strengthens the preparation of Cu-base composites: graphene oxide-copper composite powder step 3 prepared joins in the mould that material is graphite; 1h ~ 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites；The die surface of described graphite scribbles boron nitride impervious barrier.
A kind of method preparing Graphene enhancing Cu-base composites the most according to claim 1, it is characterised in that the mass concentration of the concentrated sulphuric acid described in step one is 98%.
The most according to claim 1 a kind of prepare the method that Graphene strengthens Cu-base composites, it is characterised in that the weight of the copper powder described in step 2 and mass fraction be the volume ratio of the CTAB solution of 1% be 1g:1mL.
A kind of method preparing Graphene enhancing Cu-base composites the most according to claim 1, it is characterised in that weigh graphene oxide 0.3g ultrasonic disperse 1h in the distilled water of 50mL that step one obtains in step 3, obtain graphene oxide aqueous dispersion.
A kind of method preparing Graphene enhancing Cu-base composites the most according to claim 1; it is characterized in that graphene oxide-copper composite powder step 3 prepared in step 4 joins in the mould that material is graphite; 2h is sintered under conditions of argon shield, pressure are 25MPa and temperature is 900 DEG C; naturally cool to room temperature, obtain Graphene and strengthen Cu-base composites.
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