CN105689702B - Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule - Google Patents
Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule Download PDFInfo
- Publication number
- CN105689702B CN105689702B CN201610065205.7A CN201610065205A CN105689702B CN 105689702 B CN105689702 B CN 105689702B CN 201610065205 A CN201610065205 A CN 201610065205A CN 105689702 B CN105689702 B CN 105689702B
- Authority
- CN
- China
- Prior art keywords
- powder
- graphite
- aluminium
- aluminum
- graphite composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
The present invention provides a kind of aluminium packet Graphite Composite Powder, the aluminum graphite composite and preparation method thereof comprising the composite granule, and wherein aluminium packet Graphite Composite Powder includes nanoscale aluminium powder or Al alloy powder, graphite and bonding agent, wherein：The nanoscale aluminium powder or Al alloy powder, granularity are 50~100nm, are covering material；The graphite, granularity are 20~70 μm, to coat core；The bonding agent is made of epoxy resin and/or phenolic resin+epoxy solvent or diluent+ethylenediamine and/or NL curing agent；The nanoscale aluminium powder or Al alloy powder are coated on graphite surface by binder.The present invention can solve the problems, such as the confinement problems of graphite segregation and graphite surface electroless copper/nickel technique in aluminum graphite composite preparation process.
Description
Technical field
The present invention relates to aluminum matrix composite field, more particularly to a kind of aluminium packet Graphite Composite Powder includes the composite powder
Aluminum-graphite composite of body and preparation method thereof.
Background technology
Particle enhanced aluminum-based composite material is since its excellent performance and low cost have been favored by people, and particle increases at present
Mutually there are aluminium oxide, silicon carbide, titanium carbide and graphite etc. by force.The addition of graphite particle can significantly improve material it is wear-resisting, subtract
Rub and self-lubricating property, while substantially improving the coefficient of expansion of material, thus the composite material can be used for manufacturing piston, cylinder sleeve,
The wearing pieces such as bearing shell also serve as damping part, there is broad prospect of application.
Currently, the preparation method of aluminum-graphite composite by the difference of alloy matrix aluminum state can be divided into solid state process and
Liquid phase process two major classes.When liquid phase process prepares aluminum-graphite composite, since solubility of the graphite in aluminium is less than 0.05%, and
The angle of wetting of graphite and aluminium is up to 157 °, and at 1000 DEG C, still greater than 90 ° graphite are difficult to be scattered in aluminium, and due to graphite density
It is small, it is easy to float in molten aluminum, is also also easy to produce segregation.Powder metallurgy be solid state process prepare aluminum matrix composite common method it
One, it is exactly powder metallurgic method that people, which prepare the method that aluminum-graphite composite uses at first,.When being prepared with powder metallurgic method, by
In the specific gravity difference of aluminium powder and graphite powder, and graphite powder coherency is strong, bad dispersibility, therefore mixing is not easy uniformly, to be also easy to produce partially
It is poly-；The comprehensive mechanical performance of composite material can be greatly affected.Wetability in order to solve graphite and aluminium it is poor so that
Segregation is led to the problem of, needs to handle graphite surface when preparing aluminum graphite composite, to increase the wetting of the two
Property.
The most common processing to graphite surface is graphite surface electroless copper and nickel plating.Publication No. CN1676640A,
By the peasant of Shanghai Communications University, the patent of invention that Gu Jinhai, Zhao Changli write《Copper-plated graphite granule reinforced magnesium base composite wood
Material》In point out that the chemical copper coating of graphite surface can be effectively improved the wetting between graphite and pure magnesium matrix, acceleration of sintering, from
And final mechanical property is improved, but chemical plating solution stability is poor, maintenance, adjustment and the regeneration of solution are all number
Tired, production cost is higher.Publication No. CN102601356A, going through long cloud, meter Guo Fa, permitted of heap of stone et al. write by Institutes Of Technology Of He'nan
The patent of invention write《A kind of aluminium packet silicon carbide compound particle and composite material prepared therefrom》In it is also proposed that will be received with binder
Rice coated aluminum powder improves the wetability of aluminium and silicon carbide in silicon carbide, is used in combination hot-pressing sintering method to prepare tissue and causes
It is close, carbon-free SiClx agglomeration, the silicon carbide aluminum matrix composite of excellent in mechanical performance, but the patent is directly to nano aluminum packet
The silicon carbide covered, which is sintered, prepares composite material, and nanometer aluminium powder amount used is larger, and nanometer aluminium powder preparation process is more complex,
Cost is higher.
Although graphite copper facing or nickel plating can be increased the wetability between aluminium and graphite, graphite is not made in the composite not
Uniformity coefficient reduces, but the addition of copper or nickel can make occur new alloying element or even new phase in composite material, and these
May be mutually what we were not intended to again, and the manufacturing cost of graphite surface plating copper and mickel is also bigger, has pollution to environment.
Powder metallurgy is to mix aluminum or aluminum alloy powder with graphite powder, and through being compacted, sintering into composite material, powder metallurgy passes through machinery
Method mixes graphite and aluminum substrate powder, keeps the two distribution relatively more uniform, overcomes graphite to a certain extent
With aluminium wetability difference and so that graphite is not easy that the problem of aluminum substrate and graphite are unevenly distributed with aluminium is added, but powder metallurgy prepares work
Skill and equipment are more complex, and the oxidation film of particle surface and the hole of material keep composite materials property relatively low, the shape of product
It is subject to certain restrictions with size.
Invention content
The purpose of the present invention is to provide a kind of aluminium packet Graphite Composite Powder, aluminium-graphite comprising the composite granule are compound
Material and preparation method thereof can solve the problems, such as graphite segregation and graphite surface in aluminum-graphite composite preparation process
Learn the confinement problems of copper facing/nickel technique.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of aluminium packet Graphite Composite Powder, including nanoscale aluminium powder or Al alloy powder, graphite and bonding agent, wherein：Institute
Nanoscale aluminium powder or Al alloy powder are stated, granularity is 50~100nm, is covering material；The graphite, granularity are 20~70 μm,
To coat core；The bonding agent, by epoxy resin and/or phenolic resin+epoxy solvent or diluent+ethylenediamine and/or NL curing agent groups
At；The nanoscale aluminium powder or Al alloy powder are coated on graphite surface by binder.
Further, in above-mentioned aluminium packet Graphite Composite Powder, by the nanoscale aluminium powder or Al alloy powder with it is described
The total volume fraction of graphite is calculated as 100%, wherein the volume fraction of the nanometer aluminum powder or Al alloy powder be 60%~
80%, the volume fraction of the graphite is 20%~40%.
Further, in above-mentioned aluminium packet Graphite Composite Powder, the proportioning of the bonding agent by weight is epoxy resin:
Epoxy solvent or diluent: ethylenediamine=7~10: 10~12: 1~3；Or the proportioning of the bonding agent by weight is phenolic resin: ring
Oxygen solvent or diluent: curing agent=8~11 NL: 10~12: 1~3.
Further, in above-mentioned aluminium packet Graphite Composite Powder, the weight of binder accounts for the nanoscale aluminium powder or aluminium
The 5%~8% of alloy powder, the graphite and the binder total weight.
Further, in above-mentioned aluminium packet Graphite Composite Powder, the nanometer aluminum alloy powder be selected from ZL101,
ZL101A、ZL102、6061、6063。
Further, in above-mentioned aluminium packet Graphite Composite Powder, the granularity of the nanoscale aluminium powder or Al alloy powder is
The granularity of 70~90nm, the graphite are 40~60 μm.
The present invention also provides a kind of methods preparing above-mentioned aluminium packet Graphite Composite Powder, include the following steps：
(1) the nanoscale aluminium powder or Al alloy powder are mixed into 5~10min with the graphite, obtains mixed-powder；
(2) mixed-powder is poured into the uniform mixed liquor that epoxy resin and/or phenolic resin+epoxy solvent or diluent are formed
In, after mixing 5~10min, adds ethylenediamine and/or NL curing agent carries out normal temperature cure；
(3) continue 25~35min of mixing after the completion of solidification, prepare aluminium packet Graphite Composite Powder.
The present invention also provides a kind of aluminum-graphite composite, the aluminum-graphite composite is answered by above-mentioned aluminium packet graphite
It closes powder and micron order aluminium powder or Al alloy powder is combined, the total volume fraction of the aluminum-graphite composite is calculated as
100%, wherein the micron order aluminium powder or Al alloy powder and the volume fraction of the nanoscale aluminium powder or Al alloy powder are
85%~99%, the volume fraction of the graphite is 1%~15%.
The present invention also provides a kind of methods preparing above-mentioned aluminum-graphite composite, include the following steps：
(1) prepare required raw material respectively by proportioning above-mentioned, by aluminium packet Graphite Composite Powder and the micron order aluminium powder
Or Al alloy powder is packed into batch mixer and mixes 30~35min；
(2) material for obtaining step (1) carries out high-pressure sinter, and technological parameter is：450 DEG C~750 DEG C of sintering temperature is burnt
Knot pressure power 3.5GPa~5.5GPa, 40~45min of heat-insulation pressure keeping time, obtains the aluminum-graphite composite of high-pressure sinter.
The present invention also provides the methods that another kind prepares above-mentioned aluminum-graphite composite, include the following steps：
(1) proportioning above-mentioned prepares required raw material respectively, by aluminium packet Graphite Composite Powder and the micron order aluminium powder or
Al alloy powder is packed into batch mixer and mixes 30~35min；
(2) material for obtaining step (1) carries out hot pressed sintering, and technological parameter is：290~310 DEG C keep the temperature 25~35 points
Clock, 500 DEG C~535 DEG C, sintering pressure 25MPa~50MPa, 150~210min of hot pressed sintering time of sintering temperature obtain hot pressing
The aluminum-graphite composite of sintering.
The present invention is directed to the problem of graphite segregation in aluminum-graphite composite preparation process and the plating of graphite surface electroless copper
The confinement problems of nickel technique, using binder by coated aluminum powder on graphite, just obstructed by nanometer aluminium powder between graphite,
Make graphite be not easy to agglomerate during mixed powder, can be uniformly distributed, furthermore, in sintering process, aluminium is in molten condition, isoplassont
It is easy to combine between matter, so the nanometer aluminium powder of graphite surface increases the wetability of aluminium and graphite.Aluminium powder is thinner, and clad is just
It is more uniform, nanometer aluminium powder or Al alloy powder are selected, can be obtained evenly, the better aluminium packet graphite composite powder of covered effect
Body.The present invention prepares aluminum-graphite composite using the method for hot pressing and high pressure with the graphite that nano aluminum coats, and aluminium-graphite is multiple
Condensation material is made of alloy matrix aluminum and the graphite being evenly distributed in matrix, it combines the excellent of both aluminium and graphite
Good characteristic, the metallic characters such as the specific strength of existing aluminium is high, thermal conductivity is good, and have the self lubricity of graphite and good chemical stabilization
Property, the wear-resisting of material, antifriction and self-lubricating property can be significantly improved, material absorbing and machinability can be improved, is reduced
The coefficient of expansion has a extensive future.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.Wherein：
The aluminium packet Graphite Composite Powder scanned photograph that Fig. 1, which is nanometer aluminium powder volume fraction, to be prepared when being 15%；
Although it will be seen from figure 1 that nanometer aluminium powder being evenly distributed on graphite, nanometer aluminium powder content is very little, will not
Graphite coats completely, and covered effect is bad, can influence mixed powder effect, and composite material will appear the phenomenon that graphite is reunited.
Fig. 2 is the aluminium packet Graphite Composite Powder scanned photograph that the present invention is prepared when i.e. nanometer aluminium powder volume fraction is 60%；
The content of nanometer aluminium powder is increased in Fig. 2, the volume fraction of nanometer aluminium powder is 60%, and graphite is almost by nanometer in figure
Aluminium powder coats completely, and covered effect is significantly better than Fig. 1.
Fig. 3 is the metallograph for the high-pressure sinter aluminum-graphite composite that graphite volume fraction is 5%；
Fig. 4 is the scanned photograph for the hot pressed sintering aluminum-graphite composite that graphite volume fraction is 5%.
It can be seen that aluminum substrate is uniformly distributed with graphite from Fig. 3 and Fig. 4, and find no stomata presence.
Specific implementation mode
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that in the feelings not conflicted
Under condition, the features in the embodiments and the embodiments of the present application can be combined with each other.
As shown in Figure 1 to Figure 2, according to an embodiment of the invention, a kind of aluminium packet Graphite Composite Powder, including aluminium powder are provided
Or Al alloy powder, graphite and bonding agent, wherein：Aluminium powder or Al alloy powder, granularity are 50~100nm, are covering material；Stone
Ink, granularity are 20~70 μm, to coat core；Bonding agent, by epoxy resin and/or phenolic resin+epoxy solvent or diluent+ethylenediamine
And/or NL curing agent composition.
It is cladding core that aluminium packet Graphite Composite Powder, which selects graphite, and it is clad material to select nanometer aluminium powder or Al alloy powder
Material, nanometer aluminium powder or Al alloy powder are coated to graphite surface by binder.
Nanoscale aluminium powder is selected not had an impact to the performance of composite granule because other chemical elements are introduced.
The thinner nanometer aluminium powder the better in principle, but granularity is smaller, and cost is higher, as long as so the selection of nanometer aluminium powder grain size can guarantee
It is good to graphite coat, the aluminium powder of 50~100nm available on the market be enough graphite coat is good, so in order to
Cost is saved, the aluminium powder or Al alloy powder of 50~100nm are selected.The aluminium that Fig. 1, which is nanometer aluminium powder volume fraction, to be prepared when being 15%
Packet Graphite Composite Powder scanned photograph；
Preferably, the total volume fraction of aluminium powder or Al alloy powder and graphite is calculated as 100%, wherein aluminium powder or aluminium alloy
The volume fraction of powder is 60%~80% (such as 62%, 65%, 70%, 73%, 76%, 78%), the volume fraction of graphite
For 20%~40% (such as 22%, 25%, 30%, 33%, 36%, 38%).The nanometer aluminium powder of 60%~80% volume content
Can be good by graphite coat, nanometer aluminium powder content is high again to will result in unnecessary waste, if nanometer aluminium powder content is low
In 60%, graphite coat can be made incomplete, influence mixed powder and sintering effect later.
Preferably, the proportioning of bonding agent by weight is epoxy resin: epoxy solvent or diluent: ethylenediamine=7~10: 10~12: 1
~3；Or the proportioning of bonding agent by weight is phenolic resin: epoxy solvent or diluent: curing agent=8~11 NL: 10~12: 1~3.
Binder is surface in order to promote nanometer aluminium powder to be evenly coated at graphite using purpose, to prepare composite granule and it
Afterwards composite material is mixed with matrix powder again.
Preferably, weight of binder accounts for the 5%~8% of aluminium powder or Al alloy powder, graphite and binder total weight.
Preferably, Al alloy powder is selected from ZL101, ZL101A, ZL102,6061,6063.
Preferably, the granularity of aluminium powder or Al alloy powder is 70~90nm, and the granularity of graphite is 40~60 μm.
The invention also discloses a kind of methods preparing above-mentioned aluminium packet Graphite Composite Powder, include the following steps：
(1) aluminium powder or Al alloy powder are mixed into 5~10min with graphite；
(2) uniformly mixed epoxy resin is poured into mix with epoxy solvent or diluent with epoxy solvent or diluent mixed liquor or phenolic resin
Liquid after mixing 5~10min, adds ethylenediamine or NL curing agent carries out normal temperature cure；
(3) continue 25~35min of mixing after the completion of solidification, prepare aluminium packet Graphite Composite Powder.
The embodiment of the present invention is directed to the problem of graphite segregation in aluminum-graphite composite preparation process and graphite surface
Learn plating copper and nickel technique confinement problems, using binder by coated aluminum powder on graphite, and then increase aluminium and graphite profit
It is moist, reduce the segregation of graphite in aluminum-graphite composite.Aluminium powder is thinner, and clad is more uniform, selects nanometer aluminium powder or aluminium
Alloy powder can obtain evenly, the better aluminium packet Graphite Composite Powder of covered effect.Nanometer aluminium powder passes through bonding with graphite
Agent is bonded together, and nanometer aluminium powder even adhesion forms clad on the surface layer of graphite, and covered effect is good.And the present invention is not required to
It the aluminium packet Graphite Composite Powder prepared is sieved, be scattered because after nanometer aluminium powder coated graphite
Aluminium powder is few；On the other hand it is because additional a small amount of aluminium powder is to preparing composite material without big influence, and prepares aluminium-later
When graphite composite material, additional a small amount of nanometer aluminium powder can also fill the hole between micron order aluminium powder and graphite, improve material
Consistency.
As shown in Figure 3 to Figure 4, the invention also discloses a kind of aluminum-graphite composite, the aluminum-graphite composite by
It above-mentioned aluminium packet Graphite Composite Powder and is combined, the total volume fraction of aluminum-graphite composite is calculated as 100%, wherein micro-
Meter level aluminium powder or Al alloy powder and the volume fraction of nanoscale aluminium powder or Al alloy powder are 85%~99%, the stone
The volume fraction of ink is 1%~15%.Micron order aluminium powder or Al alloy powder are preferably with 41~53 microns of 6061 aluminium.The present invention
Select micron-sized aluminum or aluminum alloy powder to prepare composite material as basis material after nanometer aluminium powder coated graphite, be because
It is lower than nano level aluminum or aluminum alloy powder for micron-sized aluminum or aluminum alloy powder cost, it is more convenient for promoting and applying.
It can be seen that aluminum substrate is uniformly distributed with graphite from Fig. 3 and Fig. 4, and find no stomata presence.
The invention also discloses a kind of methods preparing above-mentioned aluminum-graphite composite, include the following steps：
(1) prepare required raw material respectively by said ratio, by aluminium packet Graphite Composite Powder and aluminium powder or Al alloy powder
It is packed into batch mixer and mixes 30~35min (such as 31min, 32min, 33min, 34min)；
(2) material for obtaining step (1) carries out high-pressure sinter, and technique is：450 DEG C~750 DEG C of sintering temperature, sintering pressure
Power 3.5GPa~5.5GPa, 40~45min of heat-insulation pressure keeping time, obtains the aluminum-graphite composite of high-pressure sinter.
High pressure sintering process plays conclusive effect to the performance of composite material, and the factor for influencing sintering effect is mainly wrapped
Include sintering temperature, sintering pressure and heat-insulation pressure keeping time etc..Reasonably technological parameter has the performance of composite material heavy to closing
The influence wanted, by experimental study, the selection process that the present invention explores high-pressure sinter is as follows：
(1) sintering pressure：In general, pressure is bigger, and powder particle contact is closer, and the hole between powder is got over
Small, the consistency of composite material is bigger, the pressure that the present invention selects be 3.5GPa~5.5GPa (such as 3.7GPa, 3.9GPa,
4.2GPa、4.5GPa、4.8GPa、5.0GPa、5.2GPa、5.4GPa)。
(2) sintering temperature：According to thermodynamic principles, there is Clausius-Clapyron Equations between pressure and fusing point
Functional relation, with the raising of pressure, melting point metal is to rise, therefore the temperature that can be selected above aluminium fusing point is burnt
Knot, thus the present invention sintering temperature be selected as 450 DEG C~750 DEG C (such as 480 DEG C, 500 DEG C, 520 DEG C, 550 DEG C, 570 DEG C, 620
℃、670℃、690℃、730℃)。
(3) the heat-insulation pressure keeping time：The heat-insulation pressure keeping time is the time of densifying materials, grain development and elimination internal stress,
Time is too short, then densification has little time to complete and internal stress eliminates insufficient, overlong time, then it is extremely raw to be easy to cause crystal grain
It is long.The soaking time that the present invention selects is 40~45min (such as 41min, 42min, 43min, 44min).
Aluminum-graphite composite is prepared using the method for high-pressure sinter, the aluminum-graphite composite dense structure of preparation,
It is functional without graphite agglomeration.
The invention also discloses the methods that another prepares above-mentioned aluminum-graphite composite, include the following steps：
(1) prepare required raw material respectively by above-mentioned proportioning, by aluminium packet Graphite Composite Powder and aluminium powder or Al alloy powder
End is packed into batch mixer and mixes 30~35min；
(2) material for obtaining step (1) carries out hot pressed sintering, and technique is：First, 25~35 points are kept the temperature for 290~310 DEG C
Clock；Then, it is sintered, 500 DEG C~535 DEG C, sintering pressure 25MPa~50MPa of sintering temperature, the hot pressed sintering time 150~
210min obtains the aluminum-graphite composite of hot pressed sintering.
Hot-pressing sintering technique plays conclusive effect to the performance of composite material, and the factor for influencing sintering effect is mainly wrapped
Include sintering temperature, sintering pressure and heat-insulation pressure keeping time etc..Reasonably technological parameter has the performance of composite material heavy to closing
The influence wanted, by experimental study, the selection process that the present invention explores hot pressed sintering is as follows：
(1) temperature and time kept the temperature：290~310 DEG C keep the temperature 25~35 minutes.By mold with 8 DEG C~12 DEG C/min's
Speed is heated to 290~310 DEG C and keeps the temperature 25~35 minutes at this temperature, the effect of aspect in this way there are two processing mainly,
First, protection mold；Second is that can make powder particle simultaneously in this temperature 25~35 minutes, the temperature of powder particle is unified；
It is warming up to sintering temperature again in following (2) steps, if powder particle is directly raised to sintering temperature may make powder particle
Temperature disunity, influence sintering effect, and then influence composite property.
(2) sintering pressure：In general, pressure is bigger, and powder particle contact is closer, and the hole between powder is got over
It is small, composite material consistency it is bigger, the pressure that the present invention selects be 25MPa~50MPa (such as 28MPa, 30MPa,
32MPa、35MPa、38MPa、42MPa、45MPa、48MPa)。
(3) sintering temperature：:One of an important factor for sintering temperature is influence sintering effect.Sintering temperature is higher, densification
Speed is faster, while consistency is higher.But sintering temperature is excessively high, will appear the abnormal growth of crystal grain, reduces the power of product
Learn performance；The preferred sintering temperature of the present invention be 500 DEG C~535 DEG C (such as 505 DEG C, 510 DEG C, 515,520 DEG C, 525 DEG C, 528
℃、530℃)。
(4) the heat-insulation pressure keeping time：The heat-insulation pressure keeping time is the time of densifying materials, grain development and elimination internal stress,
Time is too short, then densification has little time to complete and internal stress eliminates insufficient, overlong time, then it is extremely raw to be easy to cause crystal grain
It is long.The soaking time that the present invention selects is 150~210min (such as 160min, 170min, 180min, 190min, 200min).
Aluminum-graphite composite is prepared using the method for hot pressed sintering, the aluminum-graphite composite dense structure of preparation,
It is functional without graphite agglomeration.
The raw material used in following embodiment is commercial product.
Embodiment 1
The present embodiment provides a kind of aluminium packet Graphite Composite Powders, are prepared by following steps：
(1) raw material selects：It for 80 nanometers of nanometer aluminium powder is covering material to select granularity, selects granularity for 50 microns of stone
Ink is cladding core；The total volume fraction of nanometer aluminium powder and graphite is considered as 100vol%, the volume fraction of nanometer aluminium powder is
The volume fraction of 60vol%, graphite are 40vol%；The quality of binder accounts for nanometer aluminium powder, graphite and binder gross mass
The proportioning of 5wt%, binder is：Epoxy resin: epoxy solvent or diluent: ethylenediamine=8: 10: 3.
(2) after the proportioning preparation raw material for pressing step (1), the nanometer aluminium powder weighed up is mixed into 5~10min with graphite, then
Uniformly mixed epoxy resin and epoxy solvent or diluent mixed liquor are poured into, 5~10min is mixed, ethylenediamine is added and carries out normal temperature cure,
Continue 25~35min of mixing after the completion of solidification, that is, prepares aluminium packet Graphite Composite Powder.
Fig. 2 is the scanned photograph of the graphite powder of the nanometer aluminium powder cladding prepared, can be seen that graphite is almost received in figure
Rice aluminium powder coats completely, nanometer aluminium powder distribution uniform, and covered effect is good.
Comparative example 1
This comparative example prepares a kind of aluminium packet Graphite Composite Powder, except the volume fraction of nanometer aluminium powder is 15%, the body of graphite
Fraction is other than 85vol%, other preparation methods are same as Example 1.The scanned photograph of obtained composite granule is referring to figure
1, although it will be seen from figure 1 that nanometer aluminium powder being evenly distributed on graphite, nanometer aluminium powder content is very little, that graphite is not complete
Full cladding, covered effect is bad, can influence mixed powder effect, will appear the phenomenon that graphite is reunited so as to cause composite material.
Embodiment 2
The present embodiment provides a kind of aluminum-graphite composite, the aluminum substrate of the present embodiment selects the 6061 of 41~53 microns
Aluminium is prepared by following steps：
(1) using the aluminium packet Graphite Composite Powder prepared by embodiment 1, the aluminium-graphite for preparing content of graphite 5vol% is multiple
Condensation material needs the quality that required 6061 aluminium are calculated according to the content meter of nano aluminum and graphite.
(2) prepare required raw material respectively by said ratio, aluminium packet Graphite Composite Powder and 6061 alumina particles are packed into mixed
Material machine (optional four barrels of boat stars batch mixer) mixing 30min, obtains high-pressure sinter raw material composite granule.
(3) high-pressure sinter is carried out to the high-pressure sinter raw material composite granule that step 2 obtains, technological parameter is：Sintering temperature
550 DEG C, sintering pressure 5.5GPa, heat-insulation pressure keeping time 40min obtains aluminum-graphite composite.
The aluminum-graphite composite that the present embodiment obtains is as shown in Fig. 3, can be seen that aluminum substrate uniformly divides with graphite in figure
Cloth, and find no stomata presence.
Embodiment 3
The present embodiment provides a kind of aluminum-graphite composite, the aluminum substrate of the present embodiment selects the 6061 of 41~53 microns
Aluminium is prepared by following steps：
(1) using the aluminium packet Graphite Composite Powder prepared by embodiment 1, the aluminium-graphite for preparing content of graphite 10vol% is multiple
Condensation material needs the quality that required 6061 aluminium are calculated according to the content meter of nano aluminum and graphite.
(2) prepare required raw material respectively by said ratio, aluminium packet Graphite Composite Powder and 6061 alumina particles are packed into mixed
Material machine (optional four barrels of boat stars batch mixer) mixing 30min, obtains high-pressure sinter raw material composite granule.
(3) high-pressure sinter is carried out to the high-pressure sinter raw material composite granule that step 2 obtains, technological parameter is：Sintering temperature
450 DEG C, sintering pressure 5.5GPa, heat-insulation pressure keeping time 40min obtains aluminum-graphite composite.
The aluminum-graphite composite that the present embodiment obtains, wherein aluminum substrate are uniformly distributed with graphite, and find no stomata
In the presence of.
Embodiment 4
The present embodiment provides a kind of aluminum-graphite composite, the aluminum substrate of the present embodiment selects the 6061 of 41~53 microns
Aluminium is prepared by following steps：
(1) using the aluminium packet Graphite Composite Powder prepared by embodiment 1, the aluminium-graphite for preparing content of graphite 5vol% is multiple
Condensation material calculates the quality of required 6061 aluminium.
(2) prepare required raw material respectively by said ratio, aluminium packet Graphite Composite Powder and 6061 alumina particles are packed into mixed
Material machine (optional four barrels of boat stars batch mixer) mixing 30min, obtains high-pressure sinter raw material composite granule.
(3) high-pressure sinter is carried out to the high-pressure sinter raw material composite granule that step 2 obtains, technological parameter is：Sintering temperature
650 DEG C, sintering pressure 4.5GPa, heat-insulation pressure keeping time 40min obtains aluminum-graphite composite.
The aluminum-graphite composite that the present embodiment obtains, wherein aluminum substrate are uniformly distributed with graphite, and find no stomata
In the presence of.
Embodiment 5
The present embodiment provides a kind of aluminum-graphite composite, the aluminum substrate of the present embodiment selects the 6061 of 41~53 microns
Aluminium is prepared by following steps：
(1) using the aluminium packet Graphite Composite Powder prepared by embodiment 1, the aluminium-graphite for preparing content of graphite 5vol% is multiple
Condensation material calculates the quality of required 6061 aluminium.
(2) prepare required raw material respectively by said ratio, aluminium packet Graphite Composite Powder and 6061 alumina particles are packed into mixed
Material machine (optional four barrels of boat stars batch mixer) mixing 30min, obtains hot pressed sintering raw material composite granule.
(3) hot pressed sintering is carried out to the hot pressed sintering raw material composite granule that step 2 obtains, technological parameter is：300 DEG C of heat preservations
30 minutes, 520 DEG C, sintering pressure 35MPa, hot pressed sintering time 180min of sintering temperature, the aluminium-graphite for obtaining hot pressed sintering was multiple
Condensation material.The scanned photograph of prepared composite material is as shown in figure 4, as can be seen from the figure aluminum substrate uniformly divides with graphite
Cloth, and find no stomata presence.
The aluminum-graphite composite that the present embodiment obtains is as shown in Fig. 4, can be seen that aluminum substrate uniformly divides with graphite in figure
Cloth, and find no stomata presence.
To sum up, uniform by Graphite Distribution in the aluminum-graphite composite of the invention prepared, dense structure, pore-free, wherein
Aluminum-graphite composite consistency prepared by high-pressure sinter method is up to 100%, and aluminium-graphite prepared by hot-pressing sintering method is multiple
Condensation material consistency is up to 97% or more；The vibration damping of the aluminum-graphite composite of certain content of graphite prepared by the method for the present invention
Performance is suitable with the good cast iron of damping property；Graphite has hexagoinal lattice, and inter-layer bonding force is very weak, makees in minimum shear stress
It can be cut with lower, graphite is good lubricant, and the aluminum-graphite composite lubricity prepared in the process of the present invention is good
It is good.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of aluminium packet Graphite Composite Powder, which is characterized in that including nanoscale aluminium powder or Al alloy powder, graphite and bonding
Agent, wherein：
The nanoscale aluminium powder or Al alloy powder, granularity are 50~100nm, are covering material；
The graphite, granularity are 20~70 μm, to coat core；
The binder is made of epoxy resin+epoxy solvent or diluent+ethylenediamine；
The nanoscale aluminium powder or Al alloy powder are coated on the graphite surface by the binder；
The proportioning of the binder by weight is epoxy resin: epoxy solvent or diluent: ethylenediamine=7~10: 10~12: 1~3；
The weight of binder accounts for the nanoscale aluminium powder or Al alloy powder, the graphite and binder total weight
5%~8%；The total volume fraction of the nanoscale aluminium powder or Al alloy powder and the graphite is calculated as 100%, wherein described
The volume fraction of nanoscale aluminium powder or Al alloy powder is 60%~80%, and the volume fraction of the graphite is 20%~40%.
2. aluminium packet Graphite Composite Powder according to claim 1, which is characterized in that the nanometer aluminum alloy powder is selected from
ZL101、ZL101A、ZL102、6061、6063。
3. aluminium packet Graphite Composite Powder according to claim 1, which is characterized in that the nanoscale aluminium powder or Al alloy powder
The granularity at end is 70~90nm, and the granularity of the graphite is 40~60 μm.
4. the method for preparing claims 1 to 3 any one of them aluminium packet Graphite Composite Powder, which is characterized in that including as follows
Step：
(1) the nanoscale aluminium powder or Al alloy powder are mixed into 5~10min with the graphite, obtains mixed-powder；
(2) mixed-powder is poured into the uniform mixed liquor that epoxy resin+epoxy solvent or diluent is formed, after mixing 5~10min,
It adds ethylenediamine and carries out normal temperature cure；
(3) continue 25~35min of mixing after the completion of solidification, prepare aluminium packet Graphite Composite Powder.
5. a kind of aluminum-graphite composite, which is characterized in that the aluminum-graphite composite is by any one of claims 1 to 3
The aluminium packet Graphite Composite Powder and micron order aluminium powder or Al alloy powder are combined, by the aluminum-graphite composite
Total volume fraction be calculated as 100%, wherein the micron order aluminium powder or Al alloy powder and the nanoscale aluminium powder or aluminium alloy
The volume fraction of powder is 85%~99%, and the volume fraction of the graphite is 1%~15%.
6. the method for preparing the aluminum-graphite composite described in claim 5, which is characterized in that include the following steps：
(1) volume fraction proportioning as described in claim 5 prepares required raw material respectively, by aluminium packet Graphite Composite Powder and institute
It states micron order aluminium powder or Al alloy powder is packed into batch mixer and mixes 30~35min；
(2) material for obtaining step (1) carries out high-pressure sinter, and technological parameter is：450 DEG C~750 DEG C of sintering temperature, sintering pressure
Power 3.5GPa~5.5GPa, 40~45min of heat-insulation pressure keeping time, obtains the aluminum-graphite composite of high-pressure sinter.
7. the method for preparing the aluminum-graphite composite described in claim 5, which is characterized in that include the following steps：
(1) volume fraction proportioning as described in claim 5 prepares required raw material respectively, by aluminium packet Graphite Composite Powder and institute
It states micron order aluminium powder or Al alloy powder is packed into batch mixer and mixes 30~35min；
(2) material for obtaining step (1) carries out hot pressed sintering, and technological parameter is：290~310 DEG C keep the temperature 25~35 minutes, burn
500 DEG C~535 DEG C, sintering pressure 25MPa~50MPa, 150~210min of hot pressed sintering time of junction temperature obtains hot pressed sintering
Aluminum-graphite composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065205.7A CN105689702B (en) | 2016-01-29 | 2016-01-29 | Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065205.7A CN105689702B (en) | 2016-01-29 | 2016-01-29 | Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105689702A CN105689702A (en) | 2016-06-22 |
| CN105689702B true CN105689702B (en) | 2018-09-21 |
Family
ID=56229888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610065205.7A Expired - Fee Related CN105689702B (en) | 2016-01-29 | 2016-01-29 | Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105689702B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106623890B (en) * | 2016-09-14 | 2019-02-22 | 河南理工大学 | Graphene/nanometer aluminium powder composite granule, graphene/aluminum based composites comprising the composite granule and preparation method thereof |
| CN111112600B (en) * | 2018-11-01 | 2021-10-26 | 苏州铜宝锐新材料有限公司 | Composite powder and preparation method thereof |
| CN109852831B (en) * | 2019-01-15 | 2020-09-25 | 中南大学 | Preparation method of metal material or metal composite material |
| CN110284019B (en) * | 2019-07-11 | 2020-10-02 | 长飞光纤光缆股份有限公司 | Method for directionally doping graphite in metal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601356A (en) * | 2012-04-10 | 2012-07-25 | 河南理工大学 | Aluminum clad silicon carbide composite particle and composite material prepared with same |
| CN102712042A (en) * | 2009-12-09 | 2012-10-03 | 延世大学校产学协力团 | Metal matrix composite, and preparation method thereof |
| CN103691938A (en) * | 2014-01-01 | 2014-04-02 | 北京矿冶研究总院 | Surface alloying method for metal coated powder |
| CN103722170A (en) * | 2014-01-01 | 2014-04-16 | 北京矿冶研究总院 | Agglomerated copper-aluminum-nickel graphite sealing composite powder material and preparation method thereof |
| CN104831099A (en) * | 2015-04-07 | 2015-08-12 | 苏州阿罗米科技有限公司 | Preparation method of aluminum-carbon composite material |
| CN105063580A (en) * | 2015-09-10 | 2015-11-18 | 太原理工大学 | Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material |
-
2016
- 2016-01-29 CN CN201610065205.7A patent/CN105689702B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102712042A (en) * | 2009-12-09 | 2012-10-03 | 延世大学校产学协力团 | Metal matrix composite, and preparation method thereof |
| CN102601356A (en) * | 2012-04-10 | 2012-07-25 | 河南理工大学 | Aluminum clad silicon carbide composite particle and composite material prepared with same |
| CN103691938A (en) * | 2014-01-01 | 2014-04-02 | 北京矿冶研究总院 | Surface alloying method for metal coated powder |
| CN103722170A (en) * | 2014-01-01 | 2014-04-16 | 北京矿冶研究总院 | Agglomerated copper-aluminum-nickel graphite sealing composite powder material and preparation method thereof |
| CN104831099A (en) * | 2015-04-07 | 2015-08-12 | 苏州阿罗米科技有限公司 | Preparation method of aluminum-carbon composite material |
| CN105063580A (en) * | 2015-09-10 | 2015-11-18 | 太原理工大学 | Preparation method of nickel-coated graphite powder for electroconductive rubber of electromagnetic shielding material |
Non-Patent Citations (1)
| Title |
|---|
| 石墨／铝粉在电磁屏蔽中密度纤维板上的应用;黄精明等;《中国人造板》;20151231;第22卷(第9期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105689702A (en) | 2016-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109759578B (en) | Aluminum-based composite powder for 3D printing assembled and modified by two types of ultrafine ceramic particles and preparation method and application thereof | |
| CN106623890B (en) | Graphene/nanometer aluminium powder composite granule, graphene/aluminum based composites comprising the composite granule and preparation method thereof | |
| CN105689702B (en) | Aluminium packet Graphite Composite Powder, the aluminum-graphite composite and preparation method thereof comprising the composite granule | |
| CN109852831A (en) | A kind of preparation method of metal material or metallic composite | |
| CN102337423B (en) | Preparation method of ceramic-powder-enhanced zinc-aluminum alloy based composite material | |
| CN104844225B (en) | Self-lubrication ceramic cutter material of carborundum cladding hexagonal boron nitride powder modified and preparation method thereof | |
| CN105541331B (en) | A kind of Ti3siC2the preparation method of/SiC FGM | |
| Ervina Efzan et al. | Fabrication method of aluminum matrix composite (AMCs): a review | |
| CN106702204A (en) | Copper-based powder metallurgy friction material and preparation method thereof | |
| CN105803293B (en) | A kind of Al-Cu based composite of carborundum and silicon grain enhancing and preparation method thereof | |
| CN110205536A (en) | A kind of titanium/titanium carbide core-shell structure reinforced aluminum matrix composites and preparation method thereof | |
| CN105349844A (en) | Laser cladding alloy powder with high wear resistance and preparation method thereof | |
| CN112725649A (en) | Preparation method of metal modified ceramic particle reinforced metal matrix composite material | |
| CN109680228A (en) | A kind of preparation method of carbon-reinforced metal base composite material | |
| CN105950940A (en) | Nickel-plated cubic boron nitride composite material and preparation method thereof | |
| CN104985188A (en) | Method for preparing atomized iron powder containing nano ceramic phase | |
| CN1195088C (en) | Reaction and ball grinding process to prepare in-situ reinforced Mg-based composite material | |
| CN105734347A (en) | Method for preparing TiB2 particle-reinforced Al matrix composite through SPS (spark plasma sintering) | |
| CN102560204B (en) | Silicon-aluminum bicontinuous composite material and preparation method thereof | |
| CN102676956B (en) | Method for preparing iron-based surface composite material by virtue of in-situ synthesis | |
| CN107739864A (en) | A kind of preparation method of aluminum matrix composite | |
| CN109518032A (en) | A kind of preparation method of carbon particle enhancing metal-base composites | |
| CN108385040B (en) | A kind of chopped carbon fiber enhancing magnesium-aluminum-based composite material and preparation method | |
| CN108315629B (en) | Preparation method of Al/SiC metal ceramic composite material | |
| CN102601356B (en) | Aluminum clad silicon carbide composite particle and composite material prepared with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180921 Termination date: 20220129 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |