CN109913776A - A kind of fiber reinforcement Open-cell Aluminum Foam and preparation method thereof - Google Patents
A kind of fiber reinforcement Open-cell Aluminum Foam and preparation method thereof Download PDFInfo
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- CN109913776A CN109913776A CN201910245377.6A CN201910245377A CN109913776A CN 109913776 A CN109913776 A CN 109913776A CN 201910245377 A CN201910245377 A CN 201910245377A CN 109913776 A CN109913776 A CN 109913776A
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Abstract
This application discloses a kind of fiber reinforcement Open-cell Aluminum Foams and preparation method thereof, belong to Preparation Methods of Foam Aluminum field, foam aluminium powder and salt particle are obtained by screening in the application, shearing obtains the carbon fiber of different length later, foam aluminium powder and salt particle are added while disperse carbon fibers, and the mixture of foamed aluminium, salt particle and carbon fiber is dried and suppressed, salt particle is removed finally by cleaning, obtains aperture fiber reinforcement Open-cell Aluminum Foam identical with the granulometric range of salt particle.Fiber reinforcement Open-cell Aluminum Foam of the application and preparation method thereof improves the poor problem of foamed aluminium itself mechanical property, improves the material mechanical performance of foamed aluminium.
Description
Technical field
This application involves a kind of foamed aluminium, in particular to a kind of fiber reinforcement Open-cell Aluminum Foam and preparation method thereof.
Background technique
Under cryogenic conditions, the wetability of carbon fiber and aluminium is very poor, and interface bonding strength is lower, seriously affects composite material
Energy；Under hot conditions, carbon fiber and liquid aluminium occur vigorous reaction generation frangible compounds Al4C3 and make carbon fiber structural and performance
It is impaired, decline the performance of composite material；The thermal expansion coefficient of carbon and aluminium differs greatly, and connects boundary in forming and cooling procedure
It is easy to produce stress collection at face and neutralizes segregation phenomenon.Currently, the wetting of fiber and matrix can be enhanced in fiber surface coating technology
Property improve interface bonding strength, interfacial reaction and stress concentration phenomenon are reduced, to prepare the composite material haveing excellent performance.
However, occur during liquid cast matrix grain is coarse, component segregation, consistency are low, fiber is unevenly distributed
The defects of even, also results in the performance decline of composite material；Meanwhile coating technology is reacted composite material interface and mechanical property
Influence still remain very big dispute.Fiber enhanced foam aluminum material is prepared using powder metallurgy hot isostatic pressing (HIP) technology,
Its crystal grain is tiny, no gross segregation, and completely fine and close, fiber angle of wetting in conjunction with aluminium powder can solve less than 90 ° in the solid state
The problem of fiber and aluminium powder wetability difference, moreover it is possible to prepare it is complex-shaped, using the unmanageable structural member of conventional method.Separately
Outside, aluminium powder is in solid-state always during HIP high temperature and pressure, it is possible to reduce interfacial reaction and the damage to carbon fiber performance
Evil, so that powder connects preferably with the interface of fiber, the excellent composite material of forming properties.Therefore, the invention patent uses powder
Last metallurgy method prepares fiber reinforcement open celled foam aluminum material.
Summary of the invention
There is provided a kind of fiber reinforcement Open-cell Aluminum Foams and preparation method thereof for the purpose of the application, to solve the prior art
Itself mechanical property of middle foamed aluminium is poor, or any problem such as sound absorption, energy-absorbing difference.
The technical solution of the application is: a kind of preparation method of fiber reinforcement Open-cell Aluminum Foam, comprising: step 1: preparation
Al alloy powder, the nominal composition of the Al alloy powder are [Al-3.8Cu-1.5Mg (wt%)]；Step 2: the aluminium is sieved
Alloy powder obtains -100 mesh~+250 mesh specifications powder and is used to prepare foamed aluminium material, and additive amount is 25 ± 3wt%；Sieve
Divide salt particle, obtains average diameter in the salt particle of 0.7mm~1mm, additive amount is 75 ± 3wt%；Step 3: it is obtained by shearing
0.5mm, 1mm, 3mm carbon fiber, the additive amount of the carbon fiber is respectively 0.25vol%, 0.5vol%, 0.75vol%,
Carbon fiber is impregnated and stirred in dispersing agent later, Al alloy powder and salt particle is successively added while applying stirring；
Step 4: mixture is taken out after dispersing agent volatilization and is placed in 6h under 60 ± 2 DEG C of environment；Step 5: the mixture after drying is led to
Mixing machine mixing 2.5h is crossed, fills this blend into aluminium jacket and vacuumizes later, vacuum degree is 5 × 10-3Pa hereinafter, then into
The isobaric processing of row heat；Step 6: take out heat it is isobaric after mixture carry out ultrasonic cleaning, obtain porosity 65%~
75%, pore diameter range and the identical fibre reinforced foamed aluminium of salt particle particle size range.
In one the application the step of, Al alloy powder is prepared using commercial-purity aluminium.
In three the application the step of, dispersing agent is alcohol, and alcohol amount is 300ml~400ml.
In three the application the step of, the mixing speed of whipping process is 400r/min, time 20min.
In five the application the step of, the technological parameter of the isobaric processing of heat is 480 DEG C of temperature, pressure 120MPa, heat preservation
Dwell time 3h.
In six the application the step of, ultrasonic cleaning process are as follows: Vacuum Heat green compact is placed in room temperature flowing water and removes desalination
Particle holds and removes time 2h~8h.
Present invention also provides a kind of fiber enhanced foam aluminium, are obtained by as above any preparation method.
Fiber reinforcement Open-cell Aluminum Foam of the application and preparation method thereof improves bubble by adding fiber into foamed aluminium
Itself mechanical property of foam aluminium is poor, improves the material mechanical performance of foamed aluminium.
Detailed description of the invention
In order to illustrate more clearly of technical solution provided by the present application, attached drawing will be briefly described below.It is aobvious and easy
Insight, drawings discussed below are only some embodiments of the present application.
Fig. 1 is mixing aluminium powder surface topography.
Fig. 2 is aluminium powder and salt particle blending surface pattern.
Fig. 3 is fibre reinforced Open-cell Aluminum Foam pattern.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application implementation clearer, below in conjunction in the embodiment of the present application
Attached drawing, technical solutions in the embodiments of the present application is further described in more detail.
The purpose of the application is by adding fiber in Open-cell Aluminum Foam, to enhance the mechanical characteristic of Open-cell Aluminum Foam.
The preparation method of the fiber reinforcement Open-cell Aluminum Foam of the application includes the following steps:
Step 1: preparing powder: preparing 2009 Al alloy powders, name using ZW-40 type ultrasonic gas atomisation furnace
Ingredient is Al-3.8Cu-1.5Mg (mass percent).
Wherein, preparing material used by Al alloy powder is commercial-purity aluminium.
Step 2: screening powder: being sieved using JXSZ-1L type ultrasonic vibration screening machine to 2009 Al alloy powders
Point, it obtains -100 mesh~+250 mesh specifications powder and is used to prepare open celled foam aluminum material, additive amount 25wt%.To salt
Grain carries out hand sieving, filters out the salt particle that average diameter is about 0.7mm~1mm, and additive amount is 60~75wt%.
In this step, aluminium powder additive amount is 25wt% and salt particle additive amount be 75wt% is based on to not adding fibre
The foamed aluminium of dimension carries out quasistatic compression test, the porosity ranges 60%~78% of selection, the results showed that in this range
The interior increase with relative density, the yield strength of foamed aluminium is also increase accordingly with flow stress, but is compressed to fine and close section most
Large strain reduces, while there is highdensity Open-cell Aluminum Foam certain strain hardening is shown in plastic yielding platform area,
And relative density is higher, hardening phenomenon is more obvious, and the foamed aluminium material compression curve of low-density goes out when initially entering surrender
Existing peak stress, curve is relatively flat thereafter, it is contemplated that the functional characteristic of foamed aluminium energy-absorbing, therefore choosing matrix pore rate is 75%
Add fiber.
In addition, filtering out the salt particle that average diameter is about 0.7mm~1mm is based on to the foamed aluminum materials for not adding fiber
Material carries out standing wave tube sound absorption characteristics test result, and the foamed aluminium material pore diameter range for testing selection is 0.7mm~2.5mm, test
The result shows that: sound absorbing performance of the 1.0mm ratio 2.5mm in aperture between frequency 2000Hz~6400Hz is high, and low frequency absorption performance
Variation is not very big, therefore choosing basis material pore diameter range is 0.7mm~1.0mm.
Step 3: addition fiber: obtaining 0.5mm, 1mm, 3mm carbon fiber by shearing by hand, carbon fiber additive amount is
0.25vol.%, 0.5vol.%, 0.75vol.%.Al alloy powder and salt particle is successively added in the case where applying stirring.
During adding carbon fiber in this step, uses industrial alcohol for dispersing agent, load weighted carbon fiber is soaked in
In 300ml~400ml alcohol, fiber is dispersed by agitating mode, mixing speed 400r/min, time 20min are applying
Al alloy powder and salt particle are successively added in the case where stirring.
Step 4: drying: after alcohol volatilization, taking out mixture and be placed under 60 ± 2 DEG C of environment through drying machine drying 6h.
Step 5: mixing hot pressing: the mixture after drying is utilized V-Mixer mixing 2.5h.Fill this blend into aluminium
In jacket, carry out vacuumizing degassing, vacuum degree control to 5 × 10 using vacuum pump-3Pa or less.Using RD-450 type hot isostatic pressing
Machine carries out hip treatment.
Wherein, the technological parameter of hot-pressing processing are as follows: 480 DEG C of temperature, pressure 120MPa, the heat-insulation pressure keeping time is 3h.
Step 6: ultrasonic cleaning: from the mold of static pressure machine taking out static pressure, treated that hot pressing is bad, and it is clear to carry out ultrasonic wave
It washes, removes salt particle (sodium chloride), can finally prepare fiber reinforcement Open-cell Aluminum Foam.
Using the water-soluble method except salt particle, specific embodiment are as follows: by Vacuum Heat green compact during removing salt particle
Be placed in it is molten except salt particle in room temperature flowing water, it is molten except the time is 2~8 hours.
It should be noted that it is by using equipment directly to set that some, which do not indicate range/tolerance parameter, in above-mentioned parameter
It is fixed, therefore tolerance/error of parameter is determined by equipment precision itself.For example, the mixture standing time 6h in step 4 be
Set in dryer, due to caused by dryer error time not within the scope of the considerations of the application.
In order to verify the preparation method of the application and the performance of the Open-cell Aluminum Foam obtained by the preparation method of the application,
Correlation test, carbon used by preparation process have been carried out to the fiber reinforcement Open-cell Aluminum Foam obtained under the preparation method of the application
Fiber and Al alloy powder performance parameter are as shown in table 1.
The performance parameter of table 1 T300 carbon fiber and aluminium powder
Fiber reinforcement aperture open celled foam aluminum material in the present embodiment, carbon fiber content is respectively 0%, 0.25%,
When 0.5%, the yield strength relationship of material is 0.5% > carbon fiber content of carbon fiber content, 0.25% > carbon fiber content 0%, is added
Material yield strength after fiber is added to improve significantly, and maximum yield strength is up to 12.23MPa.By comparing open celled foam aluminium
Material, carbon fiber is added in Open-cell Aluminum Foam can effectively improve the mechanical property of Open-cell Aluminum Foam, and same apertures, porosity are opened
Hole foamed aluminium basis material, the Open-cell Aluminum Foam stress for adding 5% carbon fiber can be improved 2.76 times, and plastic yielding comparison is not added
Fiber improves about 50%.Under the conditions of porosity 69.4% and aperture 0.76mm, frequency is in 0~6400 (Hz) after adding fiber
Average sound absorption coefficient be 0.76, sound absorption be better than pure open celled foam aluminum material.
It is above-mentioned the experimental results showed that, added in Open-cell Aluminum Foam fiber can not only enhance foamed aluminium Compressive Mechanical it is special
Property, while its energy-absorbing and sound absorption characteristics are improved, there is preferable application value.
The application overcomes the problem of fiber Yu aluminium interfacial wettability difference, is successfully prepared fiber reinforcement open celled foam aluminium
Material；Compressive Mechanical, sound absorption, the energy-absorbing that fiber reinforcement open celled foam aluminum material greatly improves matrix open celled foam aluminum material are special
Property, it is with a wide range of applications.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be with the scope of protection of the claims
It is quasi-.
Claims (7)
1. a kind of preparation method of fiber reinforcement Open-cell Aluminum Foam characterized by comprising
Step 1: preparing Al alloy powder, and the nominal composition of the Al alloy powder is [Al-3.8Cu-1.5Mg (wt%)]；
Step 2: sieving the Al alloy powder, obtains -100 mesh~+250 mesh specifications powder and is used to prepare foamed aluminium material,
Additive amount is 25 ± 3wt%；Sieve salt particle, obtain average diameter 0.7mm~1mm salt particle, additive amount be 75 ±
3wt%；
Step 3: obtaining the carbon fiber of 0.5mm, 1mm, 3mm by shearing, and the additive amount of the carbon fiber is respectively
Carbon fiber is impregnated and is stirred in dispersing agent later by 0.25vol%, 0.5vol%, 0.75vol%, is applying the same of stirring
Al alloy powder and salt particle is added in Shi Xianhou；
Step 4: mixture is taken out after dispersing agent volatilization and is placed in 6h under 60 ± 2 DEG C of environment；
Step 5: it by the mixture after drying by mixing machine mixing 2.5h, fills this blend into aluminium jacket and takes out true later
Sky, vacuum degree is 5 × 10-3Then Pa is hereinafter, carry out the isobaric processing of heat；
Step 6: the mixture after taking out heat equipressure carries out ultrasonic cleaning, obtains porosity in 65%~75%, pore diameter range
Fibre reinforced foamed aluminium identical with salt particle particle size range.
2. preparation method as described in claim 1, which is characterized in that prepare the Al alloy powder using technical pure
Aluminium.
3. preparation method as claimed in claim 1 or 2, which is characterized in that the dispersing agent is alcohol, and the alcohol amount is
300ml~400ml.
4. preparation method as claimed in claim 3, which is characterized in that in step 3, the mixing speed of whipping process is 400r/
Min, time 20min.
5. preparation method as claimed in claim 4, which is characterized in that the technological parameter of the isobaric processing of heat is temperature 480
DEG C, pressure 120MPa, heat-insulation pressure keeping time 3h.
6. preparation method as claimed in claim 5, which is characterized in that the process of the ultrasonic cleaning are as follows: by vacuum hotpressing
Base, which is placed in room temperature flowing water, removes salt particle, holds and removes time 2h~8h.
7. a kind of fiber reinforcement Open-cell Aluminum Foam, which is characterized in that the fiber reinforcement Open-cell Aluminum Foam passes through as being strongly required 1
It is obtained to 6 any preparation methods.
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Cited By (2)
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| CN112281088A (en) * | 2020-10-23 | 2021-01-29 | 西北工业大学 | Preparation method of carbon fiber reinforced titanium alloy composite material |
| CN113713767A (en) * | 2021-09-07 | 2021-11-30 | 盐城工学院 | Foamed aluminum modified activated carbon fiber and preparation method thereof |
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| CN112281088A (en) * | 2020-10-23 | 2021-01-29 | 西北工业大学 | Preparation method of carbon fiber reinforced titanium alloy composite material |
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