CN107760951A - A kind of diamond/aluminum composite and its low cost preparation method - Google Patents
A kind of diamond/aluminum composite and its low cost preparation method Download PDFInfo
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- CN107760951A CN107760951A CN201711050291.5A CN201711050291A CN107760951A CN 107760951 A CN107760951 A CN 107760951A CN 201711050291 A CN201711050291 A CN 201711050291A CN 107760951 A CN107760951 A CN 107760951A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1005—Pretreatment of the non-metallic additives
- C22C1/101—Pretreatment of the non-metallic additives by coating
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- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting
Abstract
A kind of diamond/aluminum composite and its low cost preparation method, it is related to a kind of diamond/aluminum composite and preparation method thereof.The present invention is in order to solve the problems, such as the meeting generation deleterious interfacial reactant of the diamond/aluminum composite of prior art preparation, thermal conductivity is low and preparation cost is high.Bortz powder of the diamond/aluminum composite by aluminum metal and with film plating layer is formed, and aluminum metal is filled in the gap of the bortz powder with film plating layer.Prepare：First, near-net-shape mould prepares；2nd, the surface coating processing of bortz powder；3rd, gas pressure infiltration prepares；4th, gas pressure infiltration；5th, it is stripped.For the consistency for the diamond/aluminum composite that the inventive method obtains up to more than 99.8%, preparation method saves aluminum metal, improves bortz powder and the interface bond strength of aluminum metal, solves the problems, such as that the existing diamond/aluminum heat conductivity of solution is low.The present invention is applied to prepare diamond/aluminum composite.
Description
Technical field
The present invention relates to a kind of diamond/aluminum composite and preparation method thereof
Background technology
The fast development of electronics industry in recent years make it that the power consumption of circuit is increasing, and this seriously improves the keys such as chip
The reliability of electronic component and the requirement in life-span.In electronic communication field, the power consumption of chip is almost with annual more than 50%
Speed is increased.The material such as the existing electronic package material for heat conduction such as molybdenum copper, tungsten copper and carbonization sial is more next
More it is difficult to meet industry requirement, or even has been the bottleneck problem for restricting industry development.And the heat conduction of diamond/aluminum composite
Performance is more than 2 times of molybdenum or copper thermal conductivity, and has appropriate thermal coefficient of expansion, is started increasingly by electronics industry
Concern.But in the market is almost available without the diamond/aluminum composite of maturation, reason is fancy price height, because
This develops a kind of preparation method of the diamond/aluminum composite of inexpensive high efficiency and is very important；
The preparation method of diamond/aluminum composite is divided into solid state process and liquid phase process, and solid state process is burnt including plasma discharging
Knot and vacuum hotpressing, liquid phase process include pressure-free impregnation, gas pressure infiltration and extrusion casint；
Gas pressure infiltration technology (GPI) is to prepare one of common technology of metal-base composites, and feature is vacuum environment, gas
Body Pressure Infiltration, the infiltration temperature higher than alloy melting point and subsequent slow stove are cold.Advantage is that the company of pressure and temperature can be achieved
Continuous change, shortcoming are high to equipment requirement, and production efficiency is low, and it is high to prepare cost.GPI can realize diamond and liquid aluminium alloy
Abundant contact, be advantageous to strengthen interface cohesion, the diamond/aluminum composite of preparation generally has excellent performance.Air pressure
Influence of the Infiltration Technics parameter to diamond/aluminum interface structure and thermal conductivity is very notable.Improved with infiltration temperature
Increase with time of contact, the reaction of diamond (111) crystal face is activated, and (100) crystal face and (111) crystal face Low Response opposite sex
Gradually reduce, the thermal conductivity of composite prepared by gas pressure infiltration reaches 670W/ (mK).On this basis, improve infiltration temperature,
Pressure and time of contact can promote the dynamics of diamond and aluminium diffusion reaction, change interfacial microstructure, to composite
Thermal conductivity produce strong influence.But the thermal conductivity of composite and dull with increasing for interfacial reaction can not improve, melt
Molten aluminum reacts with diamond and generates Al in interface4C3, Al4C3It can be hydrolyzed in wet environment, and then cause Buddha's warrior attendant
The thermal conductivity and intensity of stone aluminium composite material decline；And gas pressure infiltration technology of preparing is difficult to continuous production, and this causes very
Hardly possible reduces it and prepares cost, constrains the application of technology.
The content of the invention
The present invention in order to solve the meeting of the diamond/aluminum composite of prior art preparation produce deleterious interfacial reactant,
Thermal conductivity is low and prepares the problem of cost is high, proposes a kind of diamond/aluminum composite and its low cost preparation method.
A kind of diamond/aluminum composite, is made up of, aluminum metal is filled in aluminum metal and the bortz powder with film plating layer
In the gap of bortz powder with film plating layer；
The aluminum metal is pure aluminum or aluminum alloy；The aluminium alloy be Al-Si alloys, made of Al-Cu alloy, Al-Mg alloys,
Al-Si-Cu alloys, Al-Si-Mg alloys, Al-Cu-Mg alloy, Al-Zn-Cu alloys, Al-Zn-Mg-Cu alloy, Al-Be are closed
One or more of mixtures in gold, Al-Li alloys, Al-Si-Cu-Mg alloys；
The film plating layer of the single crystal diamond stone flour with film plating layer is one layer or more than two layers；
The material of the film plating layer is Ti, Cr, W, Mo or Zr；
The thickness of the film plating layer is 30~500nm；
The particle diameter of the bortz powder is 10~300 μm；
The volume fraction of bortz powder is 61%~70% in the diamond/aluminum composite；
The bortz powder is single crystal diamond stone flour；
The consistency of the inventive method diamond/aluminum composite is solved and prepared in the prior art up to more than 99.8%
Diamond/aluminum composite consistency it is low the problem of；The surface of single crystal diamond stone flour carries out coating film treatment and improves Buddha's warrior attendant
The wetability of stone flour and aluminum metal, makes that the interfacial reaction of diamond and aluminium is abundant, and film plating layer dissolves each other with aluminum metal, and then improves
The interface bond strength of bortz powder and aluminum metal, be advantageous to improve the thermal conductivity of diamond/aluminum composite, solve existing
The problem of diamond/aluminum heat conductivity prepared by technology is low；Diamond and reactive aluminum generation Al simultaneously4C3Buddha's warrior attendant can be made
The thermal conductivity of stone/aluminium composite material fails under hygrothermal environment, the processing of the surface coating of bortz powder can prevent or
Reduce diamond and adverse reaction generation Al occurs with aluminium4C3, so as to avoid that material clothes can be improved with the generation of adverse reaction thing
The reliability of labour；
The low cost preparation method of above-mentioned diamond/aluminum composite is carried out according to the following steps：
First, near-net-shape mould prepares
There is the near-net-shape mould of mould gate according to corresponding to prepared by the layout design of component；
The material of the mould is ceramics, refractory metal or graphite；The graphite includes being impregnated with chemical adjuvant
Graphite；The chemical adjuvant is pitch；The refractory metal is molybdenum alloy or tungsten alloy；
Wherein, the graphite for being impregnated with chemical adjuvant has higher consistency compared with conventional graphite；
2nd, the surface treatment of bortz powder
Coating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The material of the film plating layer
For Ti, Cr, W, Mo or Zr；
The coating film treatment technique is chemical plating, chemical vapor deposition, collosol and gel or magnetron sputtering；
Wherein, after the surface coating processing of bortz powder, plated film can prevent or reduce the interface of diamond and aluminium
Al4C3Generation because Al4C3Easily hydrolyze, and then cause material property to decline, so preventing or reducing diamond
With the interface A l of aluminium4C3Generation, can avoid the interface performance of diamond and aluminium decline；
3rd, gas pressure infiltration prepares
The bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, will be molded
Mould is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, will fill aluminium
The crucible of metal is placed in stove below mould；
4th, gas pressure infiltration
Temperature in gas pressure infiltration stove is increased to above to 10~300 DEG C of the fusing point of aluminum metal, is incubated after aluminum metal fusing
30~400min, then reduce lifting rod to mould and be totally immersed into inside the aluminum metal of fusing, with 2MPa/min pressurization
Speed is filled with gas into gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 0.1~10MPa, 0~30min of pressurize
Afterwards, lifting lifting rod takes out mould out of fusing aluminum metal, and the crucible of aluminum metal is filled in gas pressure infiltration stove
Top pressurize solidification；The gas being filled with the gas pressure infiltration stove is inert gas, and inert gas is helium, argon gas or nitrogen；
The pressure that gas is filled with into gas pressure infiltration stove is 0.1~10MPa；
Wherein, the pressure rise in gas pressure infiltration stove after gas is filled with into gas pressure infiltration stove, in the case of not pressurize,
The aluminum metal of fusing just can be squeezed into between the bortz powder with film plating layer in mould by force by mould gate
In gap, increased 0~30min of pressurize can more fully ensure the aluminum metal of fusing to carrying film plating layer in mould
Bortz powder is fully infiltrated, and gas pressure intensity is that 0.1~10MPa disclosure satisfy that the diamond of different-grain diameter, different crystal forms are complete
The infiltration of the aluminum metal liquation of the diamond of whole degree, the angle of wetting of different molten aluminium alloy and diamond and different viscosities；
And heating rate can't influence the preparation of diamond/aluminum composite of the present invention；
Gas pressure infiltration stove evacuation is handled and furnace temperature is promoted to 10~300 DEG C of the fusing point higher than aluminum metal, 10~300
DEG C temperature setting be to be determined according to the species of aluminum metal, the viscosity of different types of aluminum metal is different；30~400min guarantor
The warm time is determined according to the weight of aluminum metal, and enough soaking times can make that aluminum metal fully melts and temperature is uniform；
5th, it is stripped
After furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete；
The present invention possesses following beneficial effect：
1st, the consistency for the diamond/aluminum composite that the inventive method obtains solves existing skill up to more than 99.8%
The problem of consistency of the diamond/aluminum composite prepared in art is low；
2nd, by the distinctive lifting mode of the present invention infiltrate and crucible outside the type of cooling, and entered using near-net-shape mould
Row shaping, directly takes out mould, mould will not adhere to unnecessary aluminum metal solution band out of crucible from crucible after infiltration
Go out, that is, save aluminum metal and saved cost, reduce again because removing unnecessary process caused by the aluminum metal being stained with mould,
Multiple lifting rods can be set in gas pressure infiltration stove, lift after a mould infiltration terminates and will be moved into other places
Afterwards, it can be infiltrated with operating another lifting rod, form continuous infiltration, improve production efficiency, reduce preparation indirectly
Cost；
3rd, the present invention improves bortz powder and aluminum metal by carrying out coating film treatment on the surface of single crystal diamond stone flour
Wetability, make the interfacial reaction of diamond and aluminium abundant, make that the interfacial reaction of diamond and aluminium is abundant, and film plating layer is mutual with aluminum metal
It is molten, and then bortz powder and the interface bond strength of aluminum metal are improved, be advantageous to improve the thermal conductivity of diamond/aluminum composite
Rate, solve the problems, such as that diamond/aluminum heat conductivity prepared by prior art is low；The inventive method be prepared by
The thermal conductivity of commercial-purity aluminium 1199 and the diamond/aluminum composite formed with Mo film plating layers bortz powder reaches 680W/m
K；Reached by the thermal conductivity of AlSi10 aluminium alloys and the diamond/aluminum composite formed with Cr film plating layer bortz powders
520W/m·K；Reached by the thermal conductivity of 2024 aluminium alloys and the diamond/aluminum composite formed with Mo film plating layer bortz powders
To 530W/mK；Diamond and reactive aluminum generation Al simultaneously4C3The thermal conductivity of diamond/aluminum composite can be made in hygrothermal environment
Lower to fail, the present invention can prevent or reduce diamond and aluminium by carrying out coating film treatment on the surface of bortz powder
Generation adverse reaction generates Al4C3, so as to avoid that the reliability of material military service with the generation of adverse reaction thing, can be improved.
Brief description of the drawings
Fig. 1 is the inventive method gas pressure infiltration process schematic；In figure, 1 is gas pressure infiltration stove, and 2 be lifting rod, and 3 be Sheng
There is the near-net-shape mould of the bortz powder with film plating layer, 4 be crucible, and 5 be the aluminum metal after fusing.
Fig. 2 is 100 times of optical photographs of diamond/aluminum composite prepared by embodiment 3；
Fig. 3 is the diamond/aluminum composite heat conduction member with holes of embodiment 3.
Embodiment：
Technical solution of the present invention is not limited to act embodiment set forth below, in addition between each embodiment
Any reasonable combination.
Embodiment one：Present embodiment diamond/aluminum composite, the composite is by aluminum metal and with plating
The bortz powder composition of film layer, aluminum metal are filled in the gap of the bortz powder with film plating layer；
The aluminum metal is pure aluminum or aluminum alloy；
The film plating layer of the bortz powder with film plating layer is one layer or more than two layers；
The material of the film plating layer is Ti, Cr, W, Mo or Zr；
The volume fraction of bortz powder is 61%~70% in the diamond/aluminum composite.
Present embodiment possesses following beneficial effect：
The consistency of present embodiment method diamond/aluminum composite solves in the prior art up to more than 99.8%
The problem of consistency of the diamond/aluminum composite of preparation is low；The surface of single crystal diamond stone flour carries out coating film treatment and improved
The wetability of bortz powder and aluminum metal, makes that the interfacial reaction of diamond and aluminium is abundant, and film plating layer dissolves each other with aluminum metal, Jin Erti
The high interface bond strength of bortz powder and aluminum metal, is advantageous to improve the thermal conductivity of diamond/aluminum composite, solves
The problem of diamond/aluminum heat conductivity prepared by prior art is low；Diamond and reactive aluminum generation Al simultaneously4C3It can make
The thermal conductivity of diamond/aluminum composite fails under hygrothermal environment, and the surface coating processing of bortz powder can prevent
Or reduce diamond and adverse reaction generation Al occurs with aluminium4C3, so as to avoid that material can be improved with the generation of adverse reaction thing
Expect the reliability being on active service；
Embodiment two：Present embodiment is unlike embodiment one：The thickness of the film plating layer is
30~500nm.Other steps and parameter are identical with embodiment one.
Embodiment three：Present embodiment is unlike embodiment one or two：The bortz powder
Particle diameter is 10~300 μm.Other steps and parameter are identical with embodiment one or two.
Embodiment four：Unlike one of present embodiment and embodiment one to three：The diamond
Powder is single crystal diamond stone flour.Other steps and parameter are identical with one of embodiment one to three.
Embodiment five：Unlike one of present embodiment and embodiment one to four：The aluminium alloy
For Al-Si alloys, made of Al-Cu alloy, Al-Mg alloys, Al-Si-Cu alloys, Al-Si-Mg alloys, Al-Cu-Mg alloy, Al-Zn-
It is one or more of mixed in Cu alloys, Al-Zn-Mg-Cu alloy, Al-Be alloys, Al-Li alloys, Al-Si-Cu-Mg alloys
Compound.Other steps and parameter are identical with one of embodiment one to four.
Embodiment six：Illustrate present embodiment with reference to Fig. 1, present embodiment diamond/aluminum composite it is low
Cost manufacturing processes, it is characterised in that：This method is carried out according to the following steps：
First, near-net-shape mould prepares
There is the near-net-shape mould of mould gate according to corresponding to prepared by the layout design of component；
2nd, the surface treatment of bortz powder
Coating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The material of the film plating layer
For Ti, Cr, W, Mo or Zr；
3rd, gas pressure infiltration prepares
The bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, will be molded
Mould is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, will fill aluminium
The crucible of metal is placed in stove below mould；
4th, gas pressure infiltration
Temperature in gas pressure infiltration stove is increased to above to 10~300 DEG C of the fusing point of aluminum metal, is incubated after aluminum metal fusing
30~400min, then reduce lifting rod to mould and be totally immersed into inside the aluminum metal of fusing, with 2MPa/min pressurization
Speed is filled with gas into gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 0.1~10MPa, 0~30min of pressurize
Afterwards, lifting lifting rod takes out mould out of fusing aluminum metal, and the crucible of aluminum metal is filled in gas pressure infiltration stove
Top pressurize solidification；The gas being filled with the gas pressure infiltration stove is inert gas；
5th, it is stripped
After furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete.
Present embodiment possesses following beneficial effect：
1st, the consistency for the diamond/aluminum composite that present embodiment method obtains solves existing up to more than 99.8%
There is the problem of consistency of the diamond/aluminum composite prepared in technology is low；
2nd, by the distinctive lifting mode of present embodiment infiltrate and crucible outside the type of cooling, and use near-net-shape mould
Tool is molded, and directly takes out mould after infiltration from crucible, mould will not adhere to unnecessary aluminum metal solution from crucible
Inside take out of, that is, save aluminum metal and saved cost, reduce again because unnecessary caused by removing the aluminum metal being stained with mould
Process, multiple lifting rods can be set in gas pressure infiltration stove, after a mould infiltration terminates lifting get up and will be mobile
It to after other places, can be infiltrated with operating another lifting rod, form continuous infiltration, improve production efficiency, reduce indirectly
Preparation cost；
3rd, present embodiment improves bortz powder and aluminium gold by carrying out coating film treatment on the surface of single crystal diamond stone flour
The wetability of category, makes that the interfacial reaction of diamond and aluminium is abundant, and film plating layer dissolves each other with aluminum metal, so improve bortz powder with
The interface bond strength of aluminum metal, be advantageous to improve the thermal conductivity of diamond/aluminum composite, solve prior art preparation
The problem of diamond/aluminum heat conductivity is low；Present embodiment method be prepared by commercial-purity aluminium 1199 and carry
The thermal conductivity for the diamond/aluminum composite that Mo film plating layers bortz powder is formed reaches 680W/mK；By AlSi10 aluminium alloys and
The thermal conductivity of the diamond/aluminum composite formed with Cr film plating layers bortz powder reaches 520W/mK；By 2024 aluminium alloys
Reach 530W/mK with the thermal conductivity of the diamond/aluminum composite formed with Mo film plating layers bortz powder；Diamond simultaneously
Al is generated with reactive aluminum4C3The thermal conductivity of diamond/aluminum composite can be made to be failed under hygrothermal environment, present embodiment
By carrying out coating film treatment on the surface of bortz powder, it can prevent or reduce diamond and adverse reaction generation occurs with aluminium
Al4C3, so as to avoid that the reliability of material military service with the generation of adverse reaction thing, can be improved.
Embodiment seven：Present embodiment is unlike embodiment six：Mould described in step 1
Material be ceramics, refractory metal or graphite.Other steps and parameter are identical with embodiment six.
Embodiment eight：Present embodiment is unlike embodiment seven：The refractory metal closes for molybdenum
Gold or tungsten alloy.Other steps and parameter are identical with embodiment seven.
Embodiment nine：Unlike one of present embodiment and embodiment six to eight：Described in step 2
Coating film treatment technique is chemical plating, chemical vapor deposition, collosol and gel or magnetron sputtering.Other steps and parameter and specific implementation
One of mode six to eight is identical.
Embodiment ten：Unlike one of present embodiment and embodiment six to nine：Described in step 4
The pressure that gas is filled with into gas pressure infiltration stove is 0.1~10MPa.Other steps and parameter and embodiment six to nine it
One is identical.
Beneficial effects of the present invention are verified using following examples：
Embodiment 1：
Bortz powder of the present embodiment diamond/aluminum composite by aluminum metal and with film plating layer is formed, and aluminum metal is filled out
Fill in the gap of the bortz powder with film plating layer；
The aluminum metal is 2024 aluminium alloys；The film plating layer of the single crystal diamond stone flour with film plating layer is one layer；Institute
The material for stating film plating layer is Ti；The thickness of the film plating layer is 200nm；The particle diameter of the bortz powder is 100 μm；The Buddha's warrior attendant
The volume fraction of bortz powder is 70% in stone/aluminium composite material；The bortz powder is single crystal diamond stone flour；
The low cost preparation method of above-mentioned diamond/aluminum composite is carried out according to the following steps：
First, near-net-shape mould prepares
There is the near-net-shape mould of mould gate according to corresponding to prepared by the layout design of component；The mould
Material is ceramics；
2nd, the surface treatment of bortz powder
Coating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The coating film treatment technique
For chemical plating；The material of the film plating layer is Ti；
3rd, gas pressure infiltration prepares
The bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, will be molded
Mould is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, will fill aluminium
The crucible of metal is placed in stove below mould；
4th, gas pressure infiltration
Temperature in gas pressure infiltration stove is increased to above to 780 DEG C of the fusing point of aluminum metal, is incubated after aluminum metal fusing
60min, then reduce lifting rod to mould be totally immersed into inside the aluminum metal of fusing, with 2MPa/min compression rate to
Gas is filled with gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 10MPa, after pressurize 15min, lifting lifting rod will
Mould takes out out of fusing aluminum metal, and fills in gas pressure infiltration stove pressurize solidification above the crucible of aluminum metal；Institute
It is inert gas to state the gas being filled with gas pressure infiltration stove, and inert gas is nitrogen；It is described to be filled with gas into gas pressure infiltration stove
Pressure be 10MPa；
5th, it is stripped
After furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete；
The present embodiment effect is：
1st, the consistency for the diamond/aluminum composite that the present embodiment obtains is solved and made in the prior art up to 99.8%
The problem of consistency of standby diamond/aluminum composite is low；
2nd, the density of diamond/aluminum composite manufactured in the present embodiment is 3.24g/cm3, thermal conductivity 530W/mK,
Thermal coefficient of expansion is 8.0~9.0 10 at 20~100 DEG C-6/ DEG C, three-point bending strength 270MPa；
3rd, by the distinctive lifting mode of present embodiment infiltrate and crucible outside the type of cooling, and use near-net-shape mould
Tool is molded, and directly takes out mould after infiltration from crucible, mould will not adhere to unnecessary aluminum metal solution from crucible
Inside take out of, that is, save aluminum metal and saved cost, reduce again because unnecessary caused by removing the aluminum metal being stained with mould
Process, multiple lifting rods can be set in gas pressure infiltration stove, after a mould infiltration terminates lifting get up and will be mobile
It to after other places, can be infiltrated with operating another lifting rod, form continuous infiltration, improve production efficiency, reduce indirectly
Preparation cost；
Embodiment 2：
Bortz powder of the present embodiment diamond/aluminum composite by aluminum metal and with film plating layer is formed, and aluminum metal is filled out
Fill in the gap of the bortz powder with film plating layer；
The aluminum metal is AlSi10 aluminium alloys；The film plating layer of the single crystal diamond stone flour with film plating layer is one layer；
The material of the film plating layer is Cr；The thickness of the film plating layer is 100nm；The particle diameter of the bortz powder is 50 μm；The gold
The volume fraction of bortz powder is 70% in hard rock/aluminium composite material；The bortz powder is single crystal diamond stone flour；
The low cost preparation method of above-mentioned diamond/aluminum composite is carried out according to the following steps：
First, near-net-shape mould prepares
There is the near-net-shape mould of mould gate according to corresponding to prepared by the layout design of component；The mould
Material is ceramics；
2nd, the surface treatment of bortz powder
Coating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The coating film treatment technique
For chemical plating；The material of the film plating layer is Cr；
3rd, gas pressure infiltration prepares
The bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, will be molded
Mould is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, will fill aluminium
The crucible of metal is placed in stove below mould；
4th, gas pressure infiltration
Temperature in gas pressure infiltration stove is increased to above to 750 DEG C of the fusing point of aluminum metal, is incubated after aluminum metal fusing
90min, then reduce lifting rod to mould be totally immersed into inside the aluminum metal of fusing, with 2MPa/min compression rate to
Gas is filled with gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 15MPa, after pressurize 25min, lifting lifting rod will
Mould takes out out of fusing aluminum metal, and fills in gas pressure infiltration stove pressurize solidification above the crucible of aluminum metal；Institute
It is inert gas to state the gas being filled with gas pressure infiltration stove, and inert gas is nitrogen；It is described to be filled with gas into gas pressure infiltration stove
Pressure be 15MPa；
5th, it is stripped
After furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete；
The present embodiment effect is：
1st, the consistency for the diamond/aluminum composite that the present embodiment obtains is solved and made in the prior art up to 99.9%
The problem of consistency of standby diamond/aluminum composite is low；
2nd, the density of diamond/aluminum composite manufactured in the present embodiment is 3.22g/cm3, thermal conductivity 520W/mK,
Thermal coefficient of expansion is 7.0~7.5 10 at 20~100 DEG C-6/ DEG C, three-point bending strength 350MPa；
3rd, by the distinctive lifting mode of present embodiment infiltrate and crucible outside the type of cooling, and use near-net-shape mould
Tool is molded, and directly takes out mould after infiltration from crucible, mould will not adhere to unnecessary aluminum metal solution from crucible
Inside take out of, that is, save aluminum metal and saved cost, reduce again because unnecessary caused by removing the aluminum metal being stained with mould
Process, multiple lifting rods can be set in gas pressure infiltration stove, after a mould infiltration terminates lifting get up and will be mobile
It to after other places, can be infiltrated with operating another lifting rod, form continuous infiltration, improve production efficiency, reduce indirectly
Preparation cost.
Embodiment 3：
The present embodiment prepares a kind of diamond/aluminum composite heat conduction member；The present embodiment diamond/aluminum composite is led
The material of hot component is diamond/aluminum composite, and the diamond/aluminum composite is by aluminum metal and the Buddha's warrior attendant with film plating layer
Stone flour is formed, and aluminum metal is filled in the gap of the bortz powder with film plating layer；
The aluminum metal is commercial-purity aluminium 1199；The film plating layer of the single crystal diamond stone flour with film plating layer is one layer；
The material of the film plating layer is Mo；The thickness of the film plating layer is 100nm；The particle diameter of the bortz powder is 200 μm；The gold
The volume fraction of bortz powder is 70% in hard rock/aluminium composite material；The bortz powder is single crystal diamond stone flour；
The low cost preparation method of above-mentioned diamond/aluminum composite is carried out according to the following steps：
First, near-net-shape mould prepares
According to the layout design of diamond/aluminum composite heat conduction member prepare corresponding to mould gate near net into
Pattern has；The material of the mould is ceramics；
2nd, the surface treatment of bortz powder
Coating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The coating film treatment technique
For chemical plating；The material of the film plating layer is Mo；
3rd, gas pressure infiltration prepares
The bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, will be molded
Mould is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, will fill aluminium
The crucible of metal is placed in stove below mould；
4th, gas pressure infiltration
Temperature in gas pressure infiltration stove is increased to above to 800 DEG C of the fusing point of aluminum metal, is incubated after aluminum metal fusing
90min, then reduce lifting rod to mould be totally immersed into inside the aluminum metal of fusing, with 2MPa/min compression rate to
Gas is filled with gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 10MPa, after pressurize 0min, lifting lifting rod will be into
Pattern tool takes out out of fusing aluminum metal, and fills in gas pressure infiltration stove pressurize solidification above the crucible of aluminum metal；It is described
The gas being filled with gas pressure infiltration stove is inert gas, and inert gas is nitrogen；It is described to be filled with gas into gas pressure infiltration stove
Pressure is 10MPa；
5th, it is stripped
After furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete；
The present embodiment effect is：
1st, the consistency for the diamond/aluminum composite that the present embodiment obtains reaches 99.8.5%, solves in the prior art
The problem of consistency of the diamond/aluminum composite of preparation is low；
2nd, the density of diamond/aluminum composite manufactured in the present embodiment is 3.25g/cm3, thermal conductivity 680W/mK,
Thermal coefficient of expansion is 8.5~9.5 10 at 20~100 DEG C-6/ DEG C, three-point bending strength 236MPa；
3rd, by the distinctive lifting mode of present embodiment infiltrate and crucible outside the type of cooling, and use near-net-shape mould
Tool is molded, and directly takes out mould after infiltration from crucible, mould will not adhere to unnecessary aluminum metal solution from crucible
Inside take out of, that is, save aluminum metal and saved cost, reduce again because unnecessary caused by removing the aluminum metal being stained with mould
Process, multiple lifting rods can be set in gas pressure infiltration stove, after a mould infiltration terminates lifting get up and will be mobile
It to after other places, can be infiltrated with operating another lifting rod, form continuous infiltration, improve production efficiency, reduce indirectly
Preparation cost；
Fig. 2 is 100 times of optical photographs of diamond/aluminum composite prepared by embodiment 3.It is it can be seen that golden
Hard rock powder is evenly distributed in aluminum substrate, and interface cohesion is good, dense structure.
Fig. 3 is the diamond/aluminum composite heat conduction member with holes of embodiment 3；It can be seen that the present embodiment can
Prepared with obtaining the infiltration of the shaping of the vertical plane structure of excellent infiltration effect and near-net-shape, especially component such as boss,
Diamond/aluminum composite heat conduction member 13 × 13mm of size with holes manufactured in the present embodiment, thickness 1mm, boss height
1mm, aperture 1.8mm, dimensional accuracy can reach ± 0.05mm, surface roughness Ra=0.8 μm, and flatness reaches 0.05/100.
Claims (10)
- A kind of 1. diamond/aluminum composite, it is characterised in that：Diamond of the composite by aluminum metal and with film plating layer Powder is formed, and aluminum metal is filled in the gap of the bortz powder with film plating layer；The aluminum metal is pure aluminum or aluminum alloy；The film plating layer of the bortz powder with film plating layer is one layer or more than two layers；The material of the film plating layer is Ti, Cr, W, Mo or Zr；The volume fraction of bortz powder is 61%~70% in the diamond/aluminum composite.
- 2. diamond/aluminum composite according to claim 1, it is characterised in that：The thickness of the film plating layer be 30~ 500nm。
- 3. diamond/aluminum composite according to claim 1 or 2, it is characterised in that：The particle diameter of the bortz powder is 10~300 μm.
- 4. diamond/aluminum composite according to claim 3, it is characterised in that：The bortz powder is single crystal diamond Stone flour.
- 5. according to the diamond/aluminum composite described in claim 1,2 or 4, it is characterised in that：The aluminium alloy is Al-Si Alloy, made of Al-Cu alloy, Al-Mg alloys, Al-Si-Cu alloys, Al-Si-Mg alloys, Al-Cu-Mg alloy, Al-Zn-Cu alloys, One or more of mixtures in Al-Zn-Mg-Cu alloy, Al-Be alloys, Al-Li alloys, Al-Si-Cu-Mg alloys.
- A kind of 6. low cost preparation method of diamond/aluminum composite as claimed in claim 1, it is characterised in that：This method Carry out according to the following steps：First, near-net-shape mould preparesThere is the near-net-shape mould of mould gate according to corresponding to prepared by the layout design of component；2nd, the surface treatment of bortz powderCoating film treatment, which is carried out, on the surface of bortz powder obtains the bortz powder with film plating layer；The material of the film plating layer is Ti, Cr, W, Mo or Zr；3rd, gas pressure infiltration preparesThe bortz powder with film plating layer that step 2 is obtained is fitted into the near-net-shape mould in step 1, by mould It is put into gas pressure infiltration stove, and mould is lifted on to the lifting rod lower end of gas pressure infiltration stove internal upper part, aluminum metal will be filled Crucible be placed in stove below mould；4th, gas pressure infiltrationTemperature in gas pressure infiltration stove is increased to above to 10~300 DEG C of the fusing point of aluminum metal, insulation 30 after aluminum metal fusing~ 400min, then reduce lifting rod to mould and be totally immersed into inside the aluminum metal of fusing, with 2MPa/min compression rate Gas is filled with into gas pressure infiltration stove by the pressure rise in gas pressure infiltration stove to 0.1~10MPa, after 0~30min of pressurize, is carried Rise lifting rod to take out mould out of fusing aluminum metal, and fill in gas pressure infiltration stove and to be protected above the crucible of aluminum metal Pressure solidification；The gas being filled with the gas pressure infiltration stove is inert gas；5th, it is strippedAfter furnace temperature is cooled to room temperature, takes out mould and be stripped, that is, complete.
- 7. the low cost preparation method of diamond/aluminum composite according to claim 6, it is characterised in that：Step 1 The material of the mould is ceramics, refractory metal or graphite.
- 8. the low cost preparation method of diamond/aluminum composite according to claim 7, it is characterised in that：The difficulty Molten metal is molybdenum alloy or tungsten alloy.
- 9. the low cost preparation method of the diamond/aluminum composite according to claim 6 or 7, it is characterised in that：Step The two coating film treatment techniques are chemical plating, chemical vapor deposition, collosol and gel or magnetron sputtering.
- 10. the low cost preparation method of the diamond/aluminum composite according to claim 6,7 or 8, it is characterised in that： The pressure for being filled with gas described in step 4 into gas pressure infiltration stove is 0.1~10MPa.
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| CN110117731A (en) * | 2019-05-17 | 2019-08-13 | 北京科技大学 | A kind of preparation method of superelevation thermal conductivity diamond particles reinforced aluminum matrix composites |
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| CN111500892B (en) * | 2020-06-18 | 2021-08-31 | 哈尔滨锦威科技有限公司 | Preparation method of large-size flaky diamond/copper composite material with ultrahigh thermal conductivity |
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