CN1827827A - Carbon nanotube enhanced aluminium-based composite material and air hot pressing preparation method thereof - Google Patents
Carbon nanotube enhanced aluminium-based composite material and air hot pressing preparation method thereof Download PDFInfo
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- CN1827827A CN1827827A CN 200610009859 CN200610009859A CN1827827A CN 1827827 A CN1827827 A CN 1827827A CN 200610009859 CN200610009859 CN 200610009859 CN 200610009859 A CN200610009859 A CN 200610009859A CN 1827827 A CN1827827 A CN 1827827A
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Abstract
The invention relates the carbon nanometer tube enhancement aluminum-based composite material and air hot-press preparing method. The invention is for the purpose of solving the question that the carbon nanometer tube can't connect with the aluminum alloy base and providing the carbon nanometer tube enhancement aluminum-based composite material and air hot-press preparing method. The carbon nanometer tube enhancement aluminum-based composite material comprises 0.01wt%-5wt% carbon nanometer tube and 95wt%-99.99wt% alloy aluminum powder. The method comprises the following steps: 1 preparing the carbon nanometer tube composite powder: purifying and scattering carbon nanometer tube; preparing carbon nanometer tube composite powder; 2 isostatic cool pressing; 3 air heat pressing; 4 hot extrusion. The invention connects the carbon nanometer tube with aluminum alloy base, and improves the abradability, antifriction, automatic lubrication, surface wettability and mechanics property of aluminum alloy base.
Description
Technical field
The present invention relates to a kind of aluminum matrix composite and preparation method thereof.
Background technology
Metal-base composites has obtained rapidly development in nearest 20 years, it has high strength and rigidity, good anti-fatigue performance, high impact resistance and advantage such as in light weight.One of characteristics of metal-base composites are exactly that its performance can be determined by the content of adjusting wild phase, and a kind of physicals of matrix material is not only relevant with the content of wild phase, and also relevant, thereby make matrix material utilize different enhancing bodies can obtain different performances with the performance of wild phase itself.
Carbon nanotube is a kind of novel self-composed monomolecular material, it is the seamless nano level tubular material that is curled and formed by single or multiple lift carbon hexagon plane net, carbon nanotube has excellent mechanical property and lower density, have wear-resisting preferably simultaneously, antifriction performance and self-lubricating property, be that the ideal nano whisker strengthens toughening material, the ultimate form that is called as the fiber-like strengthening phase, because the volume of carbon nanotube is much smaller than conventional carbon fiber, therefore with the metallic matrix compound tense, can not destroy the continuity of matrix, just may reach the performance of conventional carbon-fibre composite with the smaller volume incorporation, particularly owing to use the carbon nanotube of catalyzer RESEARCH OF PYROCARBON hydrogen preparation, shape is thin and crooked, easily soaks into and pinning in matrix.Therefore, carbon nanotube is considered to the ideal material as the matrix material strengthening phase, and the application prospect in matrix material will be very wide.At present, can't realize that also carbon nanotube combines with alloy matrix aluminum.
Summary of the invention
The objective of the invention is for solve carbon nanotube can't with alloy matrix aluminum bonded problem, and then provide a kind of carbon nanotube enhanced aluminium-based composite material and air hot pressing preparation method thereof.The composition of carbon nanotube enhanced aluminium-based composite material and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%.The air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material carries out according to following step: the purifying of the preparation of step 1, carbon nano-tube composite powder: a, carbon nanotube disperses: the mixing acid that adds 100～200ml in each gram carbon nanotube, add tensio-active agent after the immersion again, add 10～30mg tensio-active agent in each gram carbon nanotube; Said mixture is carried out mechanical stirring and ultrasonic vibration, wash and filter, filter moisture after the solution pH value reaches 6～7 with distilled water; B, preparation carbon nano-tube composite powder: the composition of composite granule and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%, to in the carbon nanotube after the above-mentioned steps washing, add the alloy aluminium powder according to the above ratio, add dehydrated alcohol again, add 2～3ml dehydrated alcohol in each gram alloy aluminium powder; Said mixture is carried out mechanical stirring and ultrasonic vibration; Then, while stir with the spirit lamp heating, with the dehydrated alcohol evaporate to dryness; At last, powder is inserted in the vacuum drying box dry; Step 2, isostatic cool pressing: the composite granule after will drying is put into the aluminium jacket, adopts plain bumper jolt ramming, with aluminium lid its top is covered then, puts into rubber coating, sealed after being vacuumized; With the powder behind the jacket put into that cold isostatic press pressurizes, pressurize and release, pressure medium is a liquid; Step 3, air hot pressing; Step 4, hot extrusion make carbon nanotube enhanced aluminium-based composite material.
The present invention is with carbon nanotube and alloy matrix aluminum combination, wear resistance, antifriction quality, self lubricity, wettability of the surface and the mechanical property of alloy matrix aluminum have been improved, wherein tensile strength has increased 25-35%, and Young's modulus has increased 41-50%, and maximum unit elongation drops to 1-2%.
Density is meant the actual density of material and the ratio of theoretical density among the present invention, can calculate with the height of powder body material when compacting.Extrusion ratio is meant the ratio of the cross-sectional area of material among the present invention, and during extruding, the cross-sectional area of material diminishes, and length increases, and translational speed that also can press head is calculated.
Description of drawings
Fig. 1 is the synoptic diagram that composite granule is put into the aluminium jacket described in the step 2 of air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material of the present invention, Fig. 2 is an air hot pressing synoptic diagram described in the step 3 of air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material of the present invention, and Fig. 3 is a hot extrusion synoptic diagram (part 1-aluminium cover among the figure described in the step 4 of air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material of the present invention, part 2-aluminium lid, part 3-composite granule, part 4-mould, part 5-blank, part 6-goes up the steel pressure head, steel pressure head under the part 7-, part 8-thermal baffle, part 9-steel toe, part 10-sleeve, part 11-die).
Embodiment
Embodiment one: the composition of the carbon nanotube enhanced aluminium-based composite material of present embodiment and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%.
Embodiment two: the difference of present embodiment and embodiment one is that its composition and content are: carbon nanotube: 1wt%, alloy aluminium powder: 99wt%.
Embodiment three: the difference of present embodiment and embodiment one is that its composition and content are: carbon nanotube: 3wt%, alloy aluminium powder: 97wt%.
Embodiment four: the difference of present embodiment and embodiment one is that its composition and content are: carbon nanotube: 5wt%, alloy aluminium powder: 95wt%.
Embodiment five: present embodiment and embodiment one, two, three or fours' difference is that described carbon nanotube is a multi-walled carbon nano-tubes, and diameter is 10～20nm, and length is 0.5～500um.Other composition is identical with embodiment one, two, three or four.
Embodiment six: present embodiment and embodiment one, two, three or fours' difference is that described alloy aluminium powder can be 2024Al, 4032Al, 6061Al or 7075Al.Other composition is identical with embodiment one, two, three or four.
Embodiment seven: (referring to Fig. 1-Fig. 3) air hot pressing preparation method of the carbon nanotube enhanced aluminium-based composite material of present embodiment carries out according to following step: the purifying of the preparation of step 1, carbon nano-tube composite powder: a, carbon nanotube disperses: the mixing acid that adds 100～200ml in each gram carbon nanotube, add tensio-active agent after the immersion again, add 10～30mg tensio-active agent in each gram carbon nanotube; Said mixture is carried out mechanical stirring and ultrasonic vibration, wash and filter, filter moisture after the solution pH value reaches 6～7 with distilled water; B, preparation carbon nano-tube composite powder: the composition of composite granule and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%, to in the carbon nanotube after the above-mentioned steps washing, add the alloy aluminium powder according to the above ratio, add dehydrated alcohol again, add 2～3ml dehydrated alcohol in each gram alloy aluminium powder; Said mixture is carried out mechanical stirring and ultrasonic vibration; Then, while stir with the spirit lamp heating, with the dehydrated alcohol evaporate to dryness; At last, powder is inserted in the vacuum drying box dry; Step 2, isostatic cool pressing: the composite granule after will drying is put into the aluminium jacket, adopts plain bumper jolt ramming, with aluminium lid its top is covered then, puts into rubber coating, sealed after being vacuumized; With the powder behind the jacket put into that cold isostatic press pressurizes, pressurize and release, pressure medium is a liquid; Step 3, air hot pressing; Step 4, hot extrusion make carbon nanotube enhanced aluminium-based composite material.
Used carbon nanotube is a multi-walled carbon nano-tubes in the present embodiment, and diameter is 10～20nm, and length is 0.5～500um, and available from Nanometer Port Co., Ltd., Shenzhen, the aluminium powder of alloy described in the present embodiment can be 2024Al, 4032Al, 6061Al or 7075Al.
Embodiment eight: (referring to the difference of present embodiment of Fig. 1-Fig. 3) and embodiment seven be to go on foot poly-one a in the step used mixing acid be H by concentration 95～98%
2SO
4HNO with concentration 65～68%
3H by volume
2SO
4: HNO
3=3: 1 is formulated, and used tensio-active agent is a sodium lauryl sulphate, and described mixture is carried out mechanical stirring and the ultrasonic vibration of 3～5h, and the rotating speed of used agitator is 200～300r/min, and ultrasonic frequency is 2 * 10
5～1 * 10
6Hz, the aperture of used porcelain filter is 10～100nm.Other composition is identical with embodiment seven with step.
Embodiment nine: the difference of present embodiment and embodiment seven is to go on foot poly-one b carries out 1～2h to described mixture in the step mechanical stirring and ultrasonic vibration, and the rotating speed of used agitator is 200～300r/min, and ultrasonic frequency is 2 * 10
5～1 * 10
6Hz; The Heating temperature of used spirit lamp is 80～100 ℃; The vacuum tightness of vacuum drying box is 10
-2～6 * 10
-2Pa, bake out temperature are 180～220 ℃, and drying time is 10～15h.Other composition is identical with embodiment seven with step.
Embodiment ten: the difference of (referring to Fig. 1) present embodiment and embodiment seven is that the aluminium jacket is a fine aluminium described in the step poly-two, wall thickness is 0.1～0.2mm, the rubber coating material is polyvinyl chloride or chloroprene rubber, the rubber coating wall thickness is 0.4～0.8mm, the amplitude of used plain bumper is 1～2mm, the jolt ramming time is 5～10min, and vacuumizing the final vacuum degree is 10
-2～6 * 10
-2Pa, pressurization is boosted with 80～150Mpa/min speed, and when pressure reached 350～400, release behind pressurize 5～10min was unloaded with 100～200Mpa/min speed earlier and is depressed into 100Mpa, unloads with 10～20Mpa/min then and is depressed into normal pressure.Other composition is identical with embodiment seven with step.Because the plastic mold that isostatic cool pressing is utilized, during to uniform-compression, there is not the friction between powder and the mould at each, pressure reduces few, compares with the unidirectional and two-way compacting of routine, and the blank density that makes is even.Because powder process before compacting vacuumizes processing, the gas that is sealed in the blank is few simultaneously.Present embodiment is put into the jolt ramming of aluminium jacket with composite granule, put into special-purpose rubber mold again, vacuumize the back and utilize bigger pressure to obtain density greater than 90% blank, the aluminium jacket closely is attached to blank surface after the isostatic cool pressing, has reduced the oxidation of the aluminium in the follow-up hot pressing.
Embodiment 11: the difference of (referring to Fig. 2) present embodiment and embodiment seven is that step poly-three is heated to 450～500 ℃ with punching block, insulation 30～60min, the blank that step 2 is made, after putting into temperature and be box-type furnace insulation 20～30min of 450～500 ℃, putting into punching block pressurizes immediately, pressure is 800～1000Mpa, pressurize 3～6min.Other composition is identical with embodiment seven with step.Because C and aluminium react, reaction equation is:
In the hot pressed sintering of vacuum, generally adopt solid-liquid two-phase region or liquid phase director time sintering, from kinetics, surface reaction thickness has following relation
Wherein: D
0---spread coefficient, Q---reacting activation energy, R---gas law constant, T---temperature, t---the time, Φ---for depending on the coefficient of C in interfacial concentration.
By (2) formula as can be seen, surface reaction thickness is relevant with temperature of reaction and reaction times.Temperature of reaction is high more, and the reaction times is long more, and then the interface is thick more.Employing conventional hot-press sintering very easily causes the reaction between carbon nanotube and the aluminium.Present embodiment adopts at air mesohigh solid phase area sintering in short-term, has avoided the reaction between carbon nanotube and the aluminium, reaches the agglomerating purpose simultaneously.
Embodiment 12: the difference of (referring to 2) present embodiment and embodiment 11 is that step poly-three is heated to 450 ℃ with punching block, insulation 30min, the blank that step 2 is made, after putting into temperature and be 450 ℃ box-type furnace insulation 20min, putting into punching block pressurizes immediately, pressure is 800Mpa, pressurize 3min.Other composition is identical with embodiment 11 with step.
Embodiment 13: the difference of (referring to 2) present embodiment and embodiment 11 is that step poly-three is heated to 480 ℃ with punching block, insulation 50min, the blank that step 2 is made, after putting into temperature and be 480 ℃ box-type furnace insulation 25min, putting into punching block pressurizes immediately, pressure is 900Mpa, pressurize 4min.Other composition is identical with embodiment 11 with step.
Embodiment 14: the difference of (referring to 2) present embodiment and embodiment 11 is that step poly-three is heated to 500 ℃ with punching block, insulation 60min, the blank that step 2 is made, after putting into temperature and be 500 ℃ box-type furnace insulation 30min, putting into punching block pressurizes immediately, pressure is 100Mpa, pressurize 6min.Other composition is identical with embodiment 11 with step.
Embodiment 15: the difference of (referring to Fig. 3) present embodiment and embodiment seven is that step poly-four is heated to 400～460 ℃ with punching block, insulation 30～60min, the blank that step 3 is made removes crust, after putting into temperature and be box-type furnace insulation 20～30min of 400～460 ℃, putting into punching block pushes immediately, extrusion ratio is 20～25: 1, and extrusion speed is 5～10mm/s.Other composition is identical with embodiment seven with step.Behind hot extrusion deformation, obvious variation is taking place along the direction of extrusion (vertically) with perpendicular to the direction of extrusion (laterally) in the weave construction of extruding attitude matrix material, and evident characteristic is that carbon nanotube aligns along the direction of extrusion.The matrix material of sintered state strengthens body and is evenly distributed, thereby can obtain better tissue and performance behind hot extrusion deformation, for advantageous conditions is created in the post forming processing of material, and has improved its room-temperature property of using as structured material.Matrix material after this paper hot pressing density after hot extrusion reaches theoretical density, and material is fine and close fully.
Embodiment 16: the difference of (referring to Fig. 3) present embodiment and embodiment 15 is that step poly-four is heated to 400 ℃ with punching block, insulation 30min, the blank that step 3 is made removes crust, after putting into temperature and be 400 ℃ box-type furnace insulation 20min, putting into punching block pushes immediately, extrusion ratio is 20: 1, and extrusion speed is 5mm/s.Other composition is identical with embodiment 15 with step.
Embodiment 17: the difference of (referring to Fig. 3) present embodiment and embodiment 15 is that step poly-four is heated to 440 ℃ with punching block, insulation 50min, the blank that step 3 is made removes crust, after putting into temperature and be 440 ℃ box-type furnace insulation 25min, putting into punching block pushes immediately, extrusion ratio is 23: 1, and extrusion speed is 8mm/s.Other composition is identical with embodiment 15 with step.
Embodiment 18: the difference of (referring to Fig. 3) present embodiment and embodiment 15 is that step poly-four is heated to 460 ℃ with punching block, insulation 60min, the blank that step 3 is made removes crust, after putting into temperature and be 460 ℃ box-type furnace insulation 30min, putting into punching block pushes immediately, extrusion ratio is 25: 1, and extrusion speed is 10mm/s.Other composition is identical with embodiment 15 with step.
Embodiment 19: (referring to Fig. 1-Fig. 3) air hot pressing preparation method of the carbon nanotube enhanced aluminium-based composite material of present embodiment carries out according to following step: the purifying of the preparation of step 1, carbon nano-tube composite powder: a, carbon nanotube disperses: with the H of concentration 95%
2SO
4HNO with concentration 65%
3H by volume
2SO
4: HNO
3Be mixed with mixing acid at=3: 1, adds the mixing acid of 150ml in each gram carbon nanotube, adds sodium lauryl sulphate again behind the immersion 4h, adds the 20mg sodium lauryl sulphate in each gram carbon nanotube; Described mixture is carried out mechanical stirring and the ultrasonic vibration of 4h, and the rotating speed of used agitator is 250r/min, and ultrasonic frequency is 5 * 10
5Hz washs and filters with distilled water, and the aperture of used porcelain filter is 50nm, filters moisture after the solution pH value reaches 6～7; B, preparation carbon nano-tube composite powder: the composition of composite granule and content are: carbon nanotube: 1wt%, 2024Al alloy aluminium powder: 99wt%, to in the carbon nanotube after the above-mentioned steps washing, add the alloy aluminium powder according to the above ratio, add dehydrated alcohol again, add the 2.5ml dehydrated alcohol in each gram alloy aluminium powder; Described mixture is carried out mechanical stirring and the ultrasonic vibration of 1.5h, and the rotating speed of used agitator is 250r/min, and ultrasonic frequency is 5 * 10
5Hz; Then, while stir with the spirit lamp heating, Heating temperature is 90 ℃, with the dehydrated alcohol evaporate to dryness; At last, powder inserted in the vacuum drying box dry, the vacuum tightness of vacuum drying box is 5 * 10
-2Pa, bake out temperature are 200 ℃, and drying time is 12h; Step 2, isostatic cool pressing: the composite granule after will drying is put into the aluminium jacket, adopts plain bumper jolt ramming, with aluminium lid its top is covered then, puts into rubber coating, sealed after being vacuumized; Powder behind the jacket is put into cold isostatic press, and pressure medium is a liquid, boosts with 100Mpa/min speed, and when pressure reached 380, release behind the pressurize 8min was unloaded with 150Mpa/min speed earlier and is depressed into 100Mpa, unloads with 15Mpa/min then and is depressed into normal pressure; Step 3, air hot pressing: punching block is heated to 480 ℃, and insulation 50min with the blank that step 2 makes, after putting into temperature and be 480 ℃ box-type furnace and being incubated 250min, puts into punching block and pressurizes immediately, and pressure is 900Mpa, pressurize 5min; Step 4, hot extrusion: punching block is heated to 440 ℃, insulation 40min, the blank that step 3 is made removes crust, after putting into temperature and be 430 ℃ box-type furnace insulation 25min, putting into punching block pushes immediately, extrusion ratio is 23: 1, and extrusion speed is 8mm/s, makes carbon nanotube enhanced aluminium-based composite material.
Carbon nanotube and aluminium base matrix material CNTs/2024Al and matrix the 2024Al at room temperature detected result of density and mechanical property are as shown in table 1.The result shows that the mechanical property of the aluminum matrix composite that has increased carbon nanotube has had significant raising.
The density of table 1 matrix material and room temperature mechanical strength
| Material | Density (%) | Tensile strength (MPa) | Young's modulus (GPa) | Maximum unit elongation (%) |
| 2024Al | 99.89 | 447 | 70 | 12 |
| 1wt％CNTs/2024Al | 99.81 | 550 | 110 | 2.2 |
| 3wt％CNTs/2024Al | 99.78 | 620 | 121 | 1.7 |
| 5wt％CNTs/2024Al | 99.74 | 600 | 132 | 1.2 |
Claims (10)
1, a kind of carbon nanotube enhanced aluminium-based composite material is characterized in that its composition and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%.
2, a kind of carbon nanotube enhanced aluminium-based composite material according to claim 1 is characterized in that described carbon nanotube is a multi-walled carbon nano-tubes, and diameter is 10～20nm, and length is 0.5～500um.
3, a kind of carbon nanotube enhanced aluminium-based composite material according to claim 1 is characterized in that described alloy aluminium powder can be 2024A1,4032A1,6061A1 or 7075A1.
4, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material, it is achieved in that the purifying of the preparation of step 1, carbon nano-tube composite powder: a, carbon nanotube disperses: the mixing acid that adds 100～200ml in each gram carbon nanotube, add tensio-active agent after the immersion again, add 10～30mg tensio-active agent in each gram carbon nanotube; Said mixture is carried out mechanical stirring and ultrasonic vibration, wash and filter, filter moisture after the solution pH value reaches 6～7 with distilled water; B, preparation carbon nano-tube composite powder: the composition of composite granule and content are: carbon nanotube: 0.01wt%～5wt%, alloy aluminium powder: 95wt%～99.99wt%, to in the carbon nanotube after the above-mentioned steps washing, add the alloy aluminium powder according to the above ratio, add dehydrated alcohol again, add 2～3ml dehydrated alcohol in each gram alloy aluminium powder; Said mixture is carried out mechanical stirring and ultrasonic vibration; Then, while stir with the spirit lamp heating, with the dehydrated alcohol evaporate to dryness; At last, powder is inserted in the vacuum drying box dry; Step 2, isostatic cool pressing: the composite granule after will drying is put into the aluminium jacket, adopts plain bumper jolt ramming, and the amplitude of used plain bumper is 1～2mm, the jolt ramming time is 5～10min, with aluminium lid its top is covered then, puts into rubber coating, sealed after being vacuumized is taken out, and vacuum tightness is 4 * 10
-2Pa; Powder behind the jacket is put into cold isostatic press, and pressure medium is a liquid, boosts with 100Mpa/min speed, and when pressure reached 380, release behind the pressurize 8min was unloaded with 150Mpa/min speed earlier and is depressed into 100Mpa, unloads with 15Mpa/min then and is depressed into normal pressure; Step 3, air hot pressing; Step 4, hot extrusion make carbon nanotube enhanced aluminium-based composite material.
5, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4, it is characterized in that going on foot poly-one a in the step used mixing acid be H by concentration 95～98%
2SO
4HNO with concentration 65～68%
3H by volume
2SO
4: HNO
3=3: 1 is formulated, and used tensio-active agent is a sodium lauryl sulphate, and described mixture is carried out mechanical stirring and the ultrasonic vibration of 3～5h, and the rotating speed of used agitator is 200～300r/min, and ultrasonic frequency is 2 * 10
5～1 * 10
6Hz.
6, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4, it is characterized in that going on foot poly-one a in the step aperture of used porcelain filter be 10～100nm.
7, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4, it is characterized in that going on foot poly-one b carries out 1～2h to described mixture in the step mechanical stirring and ultrasonic vibration, the rotating speed of used agitator is 200～300r/min, and ultrasonic frequency is 2 * 10
5～1 * 10
6Hz; The Heating temperature of used spirit lamp is 80～100 ℃; The vacuum tightness of vacuum drying box is 10
-2～6 * 10
-2Pa, bake out temperature are 180～220 ℃, and drying time is 10～15h.
8, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4 is characterized in that going on foot the amplitude that gathers used plain bumper in two is 1～2mm, and the jolt ramming time is 5～10min, and vacuumizing the final vacuum degree is 10
-2～6 * 10
-2Pa, pressurization is boosted with 80～150Mpa/min speed, and when pressure reached 350～400, release behind pressurize 5～10min was unloaded with 100～200Mpa/min speed earlier and is depressed into 100Mpa, unloads with 10～20Mpa/min then and is depressed into normal pressure.
9, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4, it is characterized in that step poly-three is heated to 450～500 ℃ with punching block, insulation 30～60min, the blank that step 2 is made, after putting into temperature and be box-type furnace insulation 20～30min of 450～500 ℃, put into punching block and pressurize immediately, pressure is 800～1000Mpa, pressurize 3～6min.
10, the air hot pressing preparation method of carbon nanotube enhanced aluminium-based composite material according to claim 4, it is characterized in that step poly-four is heated to 400～460 ℃ with punching block, insulation 30～60min, the blank that step 3 is made removes crust, after putting into temperature and be box-type furnace insulation 20～30min of 400～460 ℃, put into punching block and push immediately, extrusion ratio is 20～25: 1, and extrusion speed is 5～10mm/s.
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| CN102714073A (en) * | 2010-01-20 | 2012-10-03 | 古河电气工业株式会社 | Composite electric cable and process for producing same |
| CN102714073B (en) * | 2010-01-20 | 2014-09-03 | 古河电气工业株式会社 | Composite electric cable and process for producing same |
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