CN101323916A - Mixed salt method for preparing aluminum matrix composite material - Google Patents
Mixed salt method for preparing aluminum matrix composite material Download PDFInfo
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- CN101323916A CN101323916A CN 200710054657 CN200710054657A CN101323916A CN 101323916 A CN101323916 A CN 101323916A CN 200710054657 CN200710054657 CN 200710054657 CN 200710054657 A CN200710054657 A CN 200710054657A CN 101323916 A CN101323916 A CN 101323916A
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- reaction
- salt
- matrix composite
- aluminum matrix
- reaction promoter
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Abstract
The invention relates to a mixed salt method for preparing an aluminum matrix composite. A matrix material is melted at a temperature ranging from 720 to 800 DEG C, kept at a constant temperature so as to cause the matrix material to be even; after being fully and excessively heated, a matrix material solution is added with a reaction salt and a reaction promoter that are evenly mixed and dried for a plurality of times, stirred by adopting a flat vane simultaneously for promoting the full reaction of the solution; when the reaction salt and the reaction promoter are added, magnesium metal is also added which further prevents reinforcing particles produced from clustering and deposing; the stirring speed of the vane is controlled to be 200 to 1000 circles per minute; after the reaction salt and the reaction promoter are added, the time of reaction is 10 to 30 minutes; finally, refining and casting are carried out to the composite, and the aluminum matrix composite is obtained with a TiB2 particle content reaching as high as 10 percent and good structural performance. The method utilizes the processes of melting alloy elements and fast stirring, solves the problems of the clustering and deposing of produced TiB2 reinforcing particles and can prepare the aluminum matrix composite with high performance.
Description
Technical field
The present invention relates to technical field of composite materials, relate in particular to a kind of method for preparing aluminum matrix composite.
Background technology
At present, in-situ authigenic reaction particles reinforced aluminum matrix composites method is by add reacting salt in aluminum melt, make enhanced granule synthetic in the inner original position of matrix, the aluminum matrix composite basal body interface combination of making is better and the interface is clean, original position enhanced granule size tiny (general＜3.0 μ m) and in matrix, being evenly distributed, by selective reaction type and control reaction parameter, can obtain the original position enhanced granule of different sorts, different quantities; The original position of enhanced granule is synthetic to be combined with foundry engieering, can be used to prepare the matrix material of definite shape and size, and technology is easy, cost is low.Find by literature search, " development of aluminum matrix composite (Dacies P.Development of Cast Aluminium MMCs) " and " important engineering materials (Key Engineering Materials) 1993,77:357-36 " in record relevant concrete preparation method, but it is not high that disclosed these methods exist prepared matrix material massfraction, maybe as the enhanced granule TiB that generates
2Mass percent greater than 8% o'clock, the weave construction of matrix material will worsen, the castability variation, the mechanical property of material reduces greatly, and about the essential reason that produces this phenomenon and how to adopt rational technology to go to solve and do not see that report is arranged.
Summary of the invention
The purpose of this invention is to provide a kind of mixed salt method for preparing aluminum matrix composite, to solve the not high and enhanced granule TiB of matrix material massfraction of existing method preparation
2Problem falls in the inclined to one side coagulation in preparation process.
The present invention adopts above-mentioned technical scheme to realize:
A kind of mixed salt method for preparing aluminum matrix composite, wherein, its concrete steps are as described below
1) body material is melted 720～800 ℃ of temperature ranges, insulation makes its homogenizing again, makes body material solution fully overheated;
2) reacting salt and the reaction promoter of adding uniform mixing and oven dry adopt blade to impose stirring simultaneously, and the stirring velocity of blade is controlled at per minute and rotated for 200～1000 weeks, and the reaction times after reacting salt and reaction promoter add is 10～30 minutes;
3) remove the salt slag after reaction is finished, and carry out refining, cast at last.
The mixed salt method of described preparation aluminum matrix composite, wherein, described reacting salt is potassium tetrafluoroborate (KBF
4) and hexafluoro potassium titanate (K
2TiF
6) mixing salt, reaction promoter is Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) and hexafluoro aluminium trisodium (Na
3AlF
6) mixing salt, wherein, Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) proportioning be 1: 1: 0.5～2, hexafluoro aluminium trisodium (Na
3AlF
6) account for above-mentioned Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) the mixture total weight amount 10～20%.
The mixed salt method of described preparation aluminum matrix composite, wherein, described step 2) in, described reacting salt and reaction promoter add fashionable, add also that to account for the body material gross weight be 1～2% MAGNESIUM METAL.
The mixed salt method of described preparation aluminum matrix composite, wherein, described reacting salt and reaction promoter are repeatedly to add in batches.
The present invention will reach following technique effect after adopting technique scheme:
The mixed salt method of preparation aluminum matrix composite of the present invention, be utilize that quick stirring method promotes reaction fully carry out generated in-situ TiB
2Particle is reunited because of partial concn is higher easily, and the present invention adopts the blade fast rotational to stir, and utilizes the provide protection of reaction fused salt self; rotating speed is controlled at 200-1000r/m; increase the touch opportunity of fused salt and aluminium liquid, accelerated reaction makes generated in-situ TiB
2Particle is more tiny; Promote on the other hand particle from the high concentration region of reaction to the diffusion of low concentration region, the sedimentation phenomenon of matrix material is eased, also make that the original position in the matrix material strengthens TiB simultaneously
2Particle can distribute in disperse; In addition, in matrix material, add an amount of MAGNESIUM METAL, reduce the surface energy of aluminum melt, increase the wettability between aluminum melt and the enhanced granule, to stop the reunion of enhanced granule, the phenomenon of effectively slowing down particles settling.The present invention has also added MAGNESIUM METAL when adding reacting salt and reaction promoter, the viscosity of aluminium liquid is increased, thereby generated in-situ TiB
2The particle translational speed reduces, and can not reunite because of being in contact with one another in a long time, is also caught by the α under the condition of high temperature-Al crystal grain easily in process of setting, to form the enhancing body of stable homogeneous.To sum up, method of the present invention can solve TiB
2The problem that the reinforced aluminum matrix composites sedimentation is poly-partially is through practice, TiB in the prepared aluminum matrix composite of present method
2The granular mass percentage composition up to 10% and structure property good.
Embodiment
The present invention contains the reaction promoter of melt alloy element and adopts quick stirring technique by adding, the temperature of reaction and the reaction times of the kind of control reaction promoter, add-on, proportioning, stirring velocity, adding, solves TiB
2The poly-partially problem of the sedimentation of reinforced aluminum matrix composites is prepared the good aluminum matrix composite of structure property.
The mixed salt method of preparation aluminum matrix composite of the present invention is specific as follows:
Body material is melted 720-800 ℃ of temperature range, be incubated homogenizing 30 minutes (min) simultaneously, add reacting salt and reaction promoter after fully overheated (wherein, reacting salt and reaction promoter must mix and dry), adopt flat blade to impose stirring in the reaction process, the blades turning velocity range is controlled at 200-1000 rev/min, and the reaction times after reacting salt and reaction promoter add is 10～30min, remove the salt slag after question response is finished, and carry out cast material after the refining treatment.
Above-mentioned reaction promoter adopts potassium chloride (KCl), sodium chloride nacl, magnesium chloride Mg Cl
2And hexafluoro aluminium trisodium Na
3AlF
6Mixing salt, wherein, potassium chloride (KCl), sodium chloride nacl and magnesium chloride Mg Cl
2Proportioning be 1: 1: 0.5～2, hexafluoro aluminium trisodium Na
3AlF
6Add-on be the 10-20% of above-mentioned three kinds of muriate mixing salt gross weights.
Described reacting salt can adopt potassium tetrafluoroborate KBF
4With hexafluoro potassium titanate K
2TiF
6, both reaction formula are
Because of generated in-situ TiB
2Particle is that diameter is the particle about 1 micron, the particle of this size does not have settled appearance in aluminium liquid, but because particle generates at a certain regional area (on the interface of fused salt and aluminium liquid) often, be easy to reunite because of partial concn is higher, and produce in case reunite, make it separate very difficulty of refinement again, so poly-partially generation the in sedimentation and the process of setting just arranged; For avoiding this situation, the present invention repeatedly adds reacting salt and auxiliary agent in batches, and reaction process adopts the stirring of blade fast rotational to promote that sufficient reacting carries out; Utilize the provide protection of reaction fused salt self, rotating speed is controlled at 200-1000 rev/min, can increase the touch opportunity of fused salt and aluminium liquid on the one hand, accelerated reaction makes generated in-situ TiB
2Particle is more tiny, promote on the other hand particle from the high concentration region of reaction to the diffusion of low concentration region, the sedimentation phenomenon of matrix material is eased, also make that the original position in the matrix material strengthens TiB simultaneously
2Particle can distribute in disperse.
And the enhanced granule TiB that solution generates
2The poly-partially problem of sedimentation, its key point is how to stop TiB
2Particle reduces surface energy by self reuniting, and the present invention is when adding reacting salt and reaction promoter, also adds MAGNESIUM METAL, add MAGNESIUM METAL amount be the 1-2% of body material weight; MAGNESIUM METAL can increase the wettability between aluminum melt and the enhanced granule when reducing the aluminum melt surface energy, because of magnesium ion can be attached to the enhanced granule TiB that generates
2The surface, stop the reunion of enhanced granule, the phenomenon of effectively slowing down particles settling; Simultaneously because the adding of magnesium, the viscosity of aluminium liquid is increased, according to the Stocks formula, matrix material viscosity increases, the translational speed of enhanced granule reduces, can not reunite in a long time, in process of setting, be caught by the α in the matrix material under the condition of high temperature-Al crystal grain easily yet, form the enhancing body of stable homogeneous because of being in contact with one another.
Through test, adopt enhanced granule TiB in the prepared aluminum matrix composite of aforesaid method
2The quality percentage composition up to 10% and structure property good; Utilize the as cast condition as cast condition mechanical property of the made aluminum matrix composite of the inventive method as follows: tensile strength sigma
b=129～260Mpa; Yield strength σ
0.2=83～204Mpa; Unit elongation δ=1.8%～5.3%; Elastic modulus E=91.2～91.4Gpa;
Embodiment 1:
With fine aluminium as body material, potassium tetrafluoroborate KBF
4With hexafluoro potassium titanate K
2TiF
6As the reaction mixing salt, reaction promoter adopts KCl, NaCl, MgCl
2And Na
3AlF
6, KCl: NaCl: MgCl wherein
2=1: 1: 0.5, Na
3AlF
6Amount be 10% of muriate total amount.
With body material 760 ℃ of fusings, be incubated homogenizing simultaneously 30 minutes, abundant overheated back adds reacting salt and the reaction promoter that mixes and dry, and the reaction times is 10min, when adding reacting salt and reaction promoter, add also that to account for body material weight be 1% MAGNESIUM METAL; Wherein, reacting salt and reaction promoter repeatedly add in batches, and each reaction adds next batch after finishing and removing the salt slag again; Adopt flat blade to impose stirring in the reaction process, stirring velocity is 600 rev/mins; After finishing, reaction adopts chlordeneization two carbon C
2Cl
6Refining, C
2Cl
6Amount be 0.5% of body material weight, refining time is 5min, leaves standstill 5min casting again, prepares mass percent and be 10% TiB
2Original position strengthens the fine aluminium matrix material, and the as cast condition as cast condition mechanical property of this material reaches tensile strength sigma
b=129Mpa, yield strength σ
0.2=83Mpa, unit elongation δ=5.3%, elastic modulus E=91.4Gpa.
Embodiment 2:
The aluminium alloy that with the model is A356 is as body material, KBF
4And K
2TiF
6As the reaction mixing salt, reaction promoter contains KCl, NaCl, MgCl
2And Na
3AlF
6, KCl: NaCl: MgCl wherein
2=1: 1: 1, Na
3AlF
6Amount be 20% of muriate gross weight.
Matrix alloy is melted 720 ℃ of temperature, be incubated homogenizing simultaneously 30 minutes, and the mixture of reacting salt and reaction promoter repeatedly added after fully overheated in batches, also adopt flat blade to stir in the reaction process with 200 rev/mins speed, promote it fully to react, the reaction times is 20min; Wherein, add fashionablely at reacting salt and reaction promoter, add also that to account for the matrix alloy material weight be 1.5% MAGNESIUM METAL; After finishing, reaction adopts C
2Cl
6Refining, its amount is controlled to be 1% of matrix alloy quality of materials, and refining time is 10min, leaves standstill 5min casting, prepares mass percent and be 10% TiB
2/ A356 matrix material, the as cast condition as cast condition mechanical property of this material is: σ
b=238Mpa; σ
0.2=192Mpa; δ=1.8%; E=91.2Gpa.
Embodiment 3:
The aluminium alloy that with the model is A356 is as body material, KBF
4And K
2TiF
6As the reaction mixing salt, reaction promoter contains KCl, NaCl, MgCl
2And Na
3AlF
6, KCl: NaCl: MgCl wherein
2=1: 1: 2, Na
3AlF
6Amount be 20% of muriate gross weight.
Aluminium alloy is melted 800 ℃ of temperature, be incubated homogenizing simultaneously 30 minutes, abundant overheated back adds reacting salt, the agent mixture that mixes and dry, and 30min is carried out in reaction; Wherein, reacting salt and auxiliary agent repeatedly add in batches, also adopt flat blade to stir with 1000 rev/mins speed in the reaction process, promote it fully to react; When adding reacting salt and auxiliary agent, also add 2% the MAGNESIUM METAL that accounts for matrix alloy weight; After finishing, reaction adopts C
2Cl
6Refining, its amount is controlled to be 0.5% of matrix alloy material weight, and refining time is 5min, leaves standstill the 5min casting, prepares enhanced granule TiB
2The quality percentage composition reaches 10% TiB
2/ A356 matrix material, the as cast condition as cast condition mechanical property of this material is: σ
b=260Mpa; σ
0.2=204Mpa; δ=2.1%; E=91.4Gpa.
The present invention has solved TiB by melt alloy element and the quick technology that stirs
2The poly-partially problem of the sedimentation of reinforced aluminum matrix composites has prepared TiB
2Granular mass percentage ratio is up to 10% and the good aluminum matrix composite of structure property, and the further expansion that also prepares particulate reinforced composite for salts reaction is simultaneously used foundation is provided.
Claims (4)
1, a kind of mixed salt method for preparing aluminum matrix composite, it is characterized in that: its concrete steps are as follows:
1) body material is melted 720～800 ℃ of temperature ranges, insulation makes its homogenizing again, makes body material solution fully overheated;
2) reacting salt and the reaction promoter of adding uniform mixing and oven dry adopt flat blade to impose stirring simultaneously, and the stirring velocity of blade is controlled at per minute and rotated for 200～1000 weeks, and the reaction times after reacting salt and reaction promoter add is 10～30 minutes;
3) remove the salt slag after reaction is finished, and carry out refining, cast at last.
2, the mixed salt method of preparation aluminum matrix composite as claimed in claim 1 is characterized in that, described reacting salt is potassium tetrafluoroborate (KBF
4) and hexafluoro potassium titanate (K
2TiF
6) mixing salt, reaction promoter is Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) and hexafluoro aluminium trisodium (Na
3AlF
6) mixing salt, wherein, Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) proportioning be 1: 1: 0.5～2, hexafluoro aluminium trisodium (Na
3AlF
6) account for above-mentioned Repone K (KCl), sodium-chlor (NaCl), magnesium chloride (MgCl
2) the mixture total weight amount 10～20%.
3, the mixed salt method of preparation aluminum matrix composite as claimed in claim 1 or 2 is characterized in that: described step 2), described reacting salt and reaction promoter add fashionable, add also that to account for the body material gross weight be 1～2% MAGNESIUM METAL.
4, the mixed salt method of preparation aluminum matrix composite as claimed in claim 3 is characterized in that, described reacting salt and reaction promoter are repeatedly to add in batches.
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|---|---|---|---|
| CN 200710054657 CN101323916A (en) | 2007-06-13 | 2007-06-13 | Mixed salt method for preparing aluminum matrix composite material |
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|---|---|---|---|
| CN 200710054657 CN101323916A (en) | 2007-06-13 | 2007-06-13 | Mixed salt method for preparing aluminum matrix composite material |
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| Publication Number | Publication Date |
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ID=40187617
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|---|---|---|---|
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103184371A (en) * | 2013-01-18 | 2013-07-03 | 周凡 | Aluminum-titanium-boron-carbon-magnesium intermediate alloy and preparation process thereof |
| CN103643046A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | Waste material recovery and treatment method of particle reinforcement aluminum matrix composite material |
| CN104328299A (en) * | 2014-10-23 | 2015-02-04 | 山东南山铝业股份有限公司 | Flux for aluminum and aluminum alloy melt refining and preparation method of flux |
| CN105626695A (en) * | 2016-03-31 | 2016-06-01 | 河南机电高等专科学校 | Aluminium base-steel bimetal bearing bush material and preparation process thereof |
| CN108772568A (en) * | 2018-05-25 | 2018-11-09 | 迈特李新材料(广州)有限公司 | A kind of preparation method of metal-base nanometer composite material powder for 3D printing |
| CN109576520A (en) * | 2018-11-30 | 2019-04-05 | 安徽工业大学 | A method of Alsimin containing nano particle is prepared using nanometer molten salt |
| CN110938759A (en) * | 2019-11-26 | 2020-03-31 | 纽维科精密制造江苏有限公司 | Production process of in-situ self-generated aluminum-based composite material for aluminum profile |
| CN111020343A (en) * | 2019-11-26 | 2020-04-17 | 纽维科精密制造江苏有限公司 | Method for preparing high-mass-fraction particle-reinforced aluminum-based composite material by using in-situ self-generation method |
| CN113846242A (en) * | 2021-09-07 | 2021-12-28 | 哈尔滨理工大学 | Composite refining/modifying agent for aluminum alloy and application thereof |
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2007
- 2007-06-13 CN CN 200710054657 patent/CN101323916A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103184371A (en) * | 2013-01-18 | 2013-07-03 | 周凡 | Aluminum-titanium-boron-carbon-magnesium intermediate alloy and preparation process thereof |
| CN103643046A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | Waste material recovery and treatment method of particle reinforcement aluminum matrix composite material |
| CN103643046B (en) * | 2013-12-11 | 2015-08-05 | 江苏大学 | The method of a kind of particle enhanced aluminum-based composite material waste recovery process |
| CN104328299A (en) * | 2014-10-23 | 2015-02-04 | 山东南山铝业股份有限公司 | Flux for aluminum and aluminum alloy melt refining and preparation method of flux |
| CN105626695A (en) * | 2016-03-31 | 2016-06-01 | 河南机电高等专科学校 | Aluminium base-steel bimetal bearing bush material and preparation process thereof |
| CN105626695B (en) * | 2016-03-31 | 2018-05-04 | 河南机电高等专科学校 | A kind of aluminium base-steel double-metal bush material and its preparation process |
| CN108772568A (en) * | 2018-05-25 | 2018-11-09 | 迈特李新材料(广州)有限公司 | A kind of preparation method of metal-base nanometer composite material powder for 3D printing |
| CN109576520A (en) * | 2018-11-30 | 2019-04-05 | 安徽工业大学 | A method of Alsimin containing nano particle is prepared using nanometer molten salt |
| CN110938759A (en) * | 2019-11-26 | 2020-03-31 | 纽维科精密制造江苏有限公司 | Production process of in-situ self-generated aluminum-based composite material for aluminum profile |
| CN111020343A (en) * | 2019-11-26 | 2020-04-17 | 纽维科精密制造江苏有限公司 | Method for preparing high-mass-fraction particle-reinforced aluminum-based composite material by using in-situ self-generation method |
| CN113846242A (en) * | 2021-09-07 | 2021-12-28 | 哈尔滨理工大学 | Composite refining/modifying agent for aluminum alloy and application thereof |
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Open date: 20081217 |