CN103924171B - A kind of preparation method of high sial CNT intermediate alloy - Google Patents
A kind of preparation method of high sial CNT intermediate alloy Download PDFInfo
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- CN103924171B CN103924171B CN201410114197.1A CN201410114197A CN103924171B CN 103924171 B CN103924171 B CN 103924171B CN 201410114197 A CN201410114197 A CN 201410114197A CN 103924171 B CN103924171 B CN 103924171B
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Abstract
A kind of preparation method of high sial CNT intermediate alloy; 6 ~ 10wt.% of raw material gross weight ratio is accounted in CNT first; alusil alloy powder and CNT are added into ball mill; the ball milling under vacuum environment or inert gas shielding, be uniformly mixed powder, then mixed-powder is put into mould; isostatic cool pressing at room temperature; then it is 580 ~ 600 DEG C, under the conditions of hot pressing pressure is 0 ~ 30MPa in temperature, 20 ~ 35min of hot pressed sintering obtains high sial CNT intermediate alloy；Si contents are 15 ~ 25wt.% of weight alloy in described Al Si alloy powders.It is uniformly dispersed the invention has the advantages that the SiC clads that CNTs surfaces are formed in intermediate alloy improve CNTs in the wetability between CNTs and alloy melt, gained alloy, and technique is simple, beneficial to industrialized production.
Description
Technical field
The invention belongs to technical field of metal material preparation.Being related to nanometer strengthens the preparation method of metal-base composites.
Background technology
Interface problem is always CNT（CNTs）The key problem of reinforced aluminum matrix composites.It is well known that CNTs
Surface tension it is extremely low, 45.3mN/m, and the surface tension of aluminium alloy is about 800 mN/m.Therefore between aluminium alloy and CNTs
Wetability extreme difference, only being combined by Van der Waals force between CNTs and aluminium alloy atom.Solve carbon fiber and aluminium interface problem is general
Method be to be applied with plating and gas phase deposition technology obtains coating in carbon fiber surface, the main purpose of coating is to prevent fiber and base
Reaction between body, while improving wetability.Many scholars use surface plating last layer in CNTs several to more than ten nano thickness
Cu、Ni、TiB、Al2O3Deng metal or ceramic material.Foreign scholar's success is after by Si powder and CNTs ball millings in vaccum sensitive stove
In Surface coating SiC CNTs is made at 1300 DEG C, SiC layer thickness is about 10nm.However, the method for CNTs Coatings is general
Need to realize under conditions of vacuum, high temperature.
Landry K et al. have found the Al in aluminum or aluminum alloy4C3 (Al+C(CNTs)→Al4C3) formation can effectively improve aluminium
Wet Out between melt and CNTs, Al/CNTs angle of wettings are down to ~ 45 ° by original 160 °.But Al4C3Formation destroy
The integrality of CNT, and Al4C3For needle-like brittlement phase, formed easily cause stress concentration in the base, will had a strong impact on
The mechanical property of composite.CNTs REINFORCED Al -23Si composites, the thermodynamics calculation results is made by thermal spraying method in Laha
Show, in CNTs REINFORCED Al -23Si alloys, generation β-SiC Gibbs free energy is far smaller than Al4C3Free energy, because
This will preferentially generate β-SiC phases in Al-23Si alloys, and the thickness of its carbide lamella can be calculated according to following equation：。
Therefore how using the safe preparation technology of simple and stable, wetability is same between raising aluminium alloy and CNTs
When, and prevent Al4C3The generation of needle-like brittlement phase, improves the mechanical property of carbon nanometer reinforced aluminum matrix composites, is current research and development
Prepare the main bugbear that carbon nanotube enhanced aluminium-based composite material is faced.
The content of the invention
The purpose of the present invention is to overcome the defect of prior art there is provided a kind of high sial-CNT（Al-CNTs）It is middle
The preparation method of alloy.This method preparation technology simple and stable, for preparing carbon nanotube enhanced aluminium-based composite material, is especially fitted
For aluminium-silicon（Al-Si）It is alloy.
The purpose of the present invention is achieved through the following technical solutions.
6 ~ 10wt.% of raw material gross weight ratio is accounted in CNT first, by aluminium-silicon alloys powder and CNT
Addition ball mill, the ball milling under vacuum environment or inert gas shielding, be uniformly mixed powder, then mixed-powder is put into mould
In tool, isostatic cool pressing at room temperature is then 580 ~ 600 DEG C, under the conditions of hot pressing pressure is 0 ~ 30MPa in temperature, hot pressed sintering
20 ~ 35min, obtains high sial-CNT intermediate alloy.
Si contents are 15 ~ 25wt.% of weight alloy in Al-Si alloy powders of the present invention.
The present invention has the advantages that its is unique in terms of CNT aluminum matrix composite is prepared：The thermodynamics calculation results table
It is bright, when silicon from aluminum-silicon alloy content >=15wt.% and temperature are 600K ~ 1200K, in the carbon of CNTs surface reaction generation
Compound is based on SiC, and the formation of fine and close SiC protective layers will prevent CNTs and Si in alloy reaction, therefore the thickness of SiC layer
Degree only has 0.5 ~ 1nm；And SiC formation improves the wetability between CNTs and alloy melt, beneficial to CNTs in the alloy
It is dispersed；CNT is added in the form of intermediate alloy can be by controlling the addition of intermediate alloy flexibly to change compound
CNTs content in material.
The advantage of the invention is that the SiC clads that CNTs surfaces are formed in intermediate alloy improve CNTs and alloy melt
Between wetability, CNTs is uniformly dispersed in gained alloy, and technique is simple, beneficial to industrialized production.
Brief description of the drawings
Fig. 1 is high sial-CNT made from embodiment 1 of the present invention（Al-CNTs）The microscopic structure of intermediate alloy
Picture.
Embodiment
The present invention will be described further by following examples.
Embodiment 1.
Raw material is used as using Al-15Si alloy powders and CNTs（CNTs accounts for the 6wt.% of raw material gross weight）, then will prepare
Raw material adds vacuum ball milling in ball mill, and be uniformly mixed powder, then mixed-powder is put into mould, cold etc. at room temperature
Static pressure, then carries out hot pressed sintering 35min and obtains high silicon Al-CNTs intermediate alloys, wherein hot pressed sintering temperature is 580 DEG C, hot pressing
Pressure is 25MPa.
Embodiment 2.
Raw material is used as using Al-25Si alloy powders and CNTs（CNTs accounts for the 10wt.% of raw material gross weight）, then will prepare
Raw material add in ball mill ball milling under inert gas shielding, be uniformly mixed powder, then mixed-powder is put into mould,
Isostatic cool pressing, then carries out hot pressed sintering 30min and obtains high silicon Al-CNTs intermediate alloys, wherein hot pressed sintering temperature at room temperature
For 590 DEG C, hot pressing pressure is 15MPa.
Embodiment 3.
Raw material is used as using Al-20Si alloy powders and CNTs（CNTs accounts for the 8wt.% of raw material gross weight）, then will prepare
Raw material add ball mill in vacuum ball milling, be uniformly mixed powder, then mixed-powder is put into mould, cold at room temperature
Isostatic pressed, then carries out hot pressed sintering 20min and obtains high silicon Al-CNTs intermediate alloys, wherein hot pressed sintering temperature is 600 DEG C, heat
Pressure pressure is 5MPa.
Claims (1)
1. a kind of preparation method of high sial-CNT intermediate alloy, it is characterized in that accounting for raw material gross weight by CNT first
6~8wt.% of amount ratio, adds ball mill, in vacuum environment or inert gas by aluminium-silicon alloys powder and CNT
The lower ball milling of protection, be uniformly mixed powder, then mixed-powder is put into mould, at room temperature isostatic cool pressing, then in temperature
Under the conditions of degree is 580~600 DEG C, hot pressing pressure is 5~30MPa, 20~35min of hot pressed sintering is obtained in high sial-CNT
Between alloy；Silicone content is 15~25wt.% of weight alloy in described aluminium-silicon alloys powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410114197.1A CN103924171B (en) | 2014-03-26 | 2014-03-26 | A kind of preparation method of high sial CNT intermediate alloy |
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| CN201410114197.1A CN103924171B (en) | 2014-03-26 | 2014-03-26 | A kind of preparation method of high sial CNT intermediate alloy |
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| CN103924171A CN103924171A (en) | 2014-07-16 |
| CN103924171B true CN103924171B (en) | 2017-08-25 |
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| CN111636006B (en) * | 2020-05-29 | 2021-09-28 | 香港生产力促进局 | Aluminum-silicon alloy graphite composite heat conduction material and preparation and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743337A (en) * | 2007-07-05 | 2010-06-16 | 住友精密工业株式会社 | Highly thermally conductive composite material |
| CN103602843A (en) * | 2013-12-09 | 2014-02-26 | 国家电网公司 | Carbon-nanotube-reinforced aluminum-base composite material |
| CN103614672A (en) * | 2013-12-09 | 2014-03-05 | 国家电网公司 | Preparation method of carbon nano tube-reinforced aluminum base composite material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101743337A (en) * | 2007-07-05 | 2010-06-16 | 住友精密工业株式会社 | Highly thermally conductive composite material |
| CN103602843A (en) * | 2013-12-09 | 2014-02-26 | 国家电网公司 | Carbon-nanotube-reinforced aluminum-base composite material |
| CN103614672A (en) * | 2013-12-09 | 2014-03-05 | 国家电网公司 | Preparation method of carbon nano tube-reinforced aluminum base composite material |
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