CN103924116B - A kind of low-voltage pulse magnetic field effect is lower to improve the method that SiC particulate is distributed in magnesium-based composite material - Google Patents
A kind of low-voltage pulse magnetic field effect is lower to improve the method that SiC particulate is distributed in magnesium-based composite material Download PDFInfo
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- CN103924116B CN103924116B CN201410123403.5A CN201410123403A CN103924116B CN 103924116 B CN103924116 B CN 103924116B CN 201410123403 A CN201410123403 A CN 201410123403A CN 103924116 B CN103924116 B CN 103924116B
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Abstract
The invention discloses a kind of low-voltage pulse magnetic fields to act on the lower method for improving SiC particulate and being distributed in magnesium-based composite material, first SiC particulate is added in magnesium alloy fused mass, it stirs evenly, then alloy melt is poured into the mold for being placed in pulsed magnetic field coagulation system, solidifies Composite Melt completely under low-voltage pulse magnetic field effect.The invention has the advantages that (1) is environmentally protective, simple process, easy to operate, easily controllable, cost and small investment, this method only needs the intensity of pulse magnetic field and the solidification rate of alloy to be controlled；(2) pollution-free, pulsed magnetic field is not directly contacted with alloy melt, will not generate pollution to melt, will not generate pollution to environment.
Description
Technical field
The present invention relates to a kind of methods more particularly to a kind of low pressure that improvement SiC particulate is distributed in magnesium-based composite material
Improve the method that SiC particulate is distributed in magnesium-based composite material under pulsed magnetic field action.
Background technique
Magnesium-based composite material has good damping noise reduction performance, electromagnetic shielding performance, machining property and good
The advantages that mechanical property.SiC particulate has preferable wearability, dimensional stability, heat shock resistance and high rigidity, and particle enhancing is multiple
Condensation material anisotropy, in numerous magnesium-based composite materials, SiC magnesium-based composite material has good comprehensive mechanical property, main
There are good physical and chemical properties because of SiC particulate, integrate high rigidity, wearability and the stability of SiC particulate, furthermore
The SiC particulate of addition can inhibit the extension of crackle, refinement crystal grain to improve its comprehensive mechanical property.Therefore, SiC particulate enhances magnesium
Based composites will be most fast one of the magnesium-based composite material of the growth rate of Modern Industry Products application from now on.
At present the preparation method of magnesium-based composite material mainly have extrusion casint, powder metallurgy, melt infiltration, jet deposition,
Film metallurgical method, stirring casting and reaction in-situ are thought of a way certainly.
(1) stirring casting method
Stirring casting method is exactly to lean on the methods of mechanical stirring, electromagnetic agitation or high-energy ultrasonic, makes reinforced phase particle sufficiently more
The finally process of casting or extrusion forming is scattered in magnesium matrix alloy melt.Mechanical stirring casting method technique, equipment letter
It is single, produce high-efficient, but defect is inevitably to be involved in gas in strong whipping process and field trash is mixed into, and forms casting
Gas making hole is also difficult to the phenomenon that avoiding reinforced phase particle agglomeration and segregation completely simultaneously.The Beater operators such as electromagnetic agitation and high-energy ultrasonic
Skill is environmentally protective, can improve the wetability of enhancing particle and matrix, improves particle and is evenly distributed in matrix, and will not camera
Situations such as tool stirs the same volume gas and brings new impurity into.But this technique is immature, the device is complicated, also in conceptual phase, this
Technique is the new research direction of magnesium-based composite material preparation.
(2) powder metallurgic method
Powder metallurgic method prepare the technique of composite material first matrix powder and reinforcement powder according to a certain percentage
It first carries out being uniformly mixed then progress ball milling, compacting and sintering and prepares composite material.Its advantage is that gold can be prepared directly
Metal-matrix composite material to matrix alloy type and reinforcement type there is no limit and particle can be uniformly distributed and can make in matrix
Obtain the metal-base composites of high-volume fractional reinforced phase.But have the drawback that equipment cost height, complex process, the method technique
There is certain limitation to more complicated design of part, and the composite material voidage prepared is larger.
(3) spray deposition
Spray deposition be first liquid magnesium alloy high-pressure inert gas injection under be atomized, formed melted pure magnesium or
Magnesium alloy injection stream, while enhancing particle being sprayed into melted pure magnesium or magnesium alloy jet mixes liquid-solid two-phase and common
It deposits on the substrate of pre-prepared processing, final solidification obtains particle reinforced magnesium base compound material.Spray deposition preparation is answered
Condensation material particle is distributed in the base, without segregation, without interfacial reaction, quick solidification, but enhance particle and metal interface is machine
Tool combination tensile strength is lower and can have hole.
(4) film metallurgical technique
Film metallurgical method is surface treatment method, prepares magnesium-based body thin film first, then applies one layer of increasing in film surface
Then strong body particle is squeezed and deformed and is heat-treated, reinforcement and matrix is made to be closely linked to form composite material.
(5) molten liquid forming
Melt infiltration is that metal bath by capillary force or applies under the action of external force to porous preform at high temperature
And it infiltrates to prepare particulate reinforced composite in the gap of loosely-packed bed.
(6) extrusion casint
Squeeze cast form is liquid or semi-liquid metal based composites are full of casting mold and solidification under pressure
Casting method.
(7) reaction in-situ is thought of a way certainly
It is by the way that alloying element or chemical combination are added in magnesium alloy fused mass that the spontaneous method of reaction in-situ, which prepares magnesium-based composite material,
Object reacts the composite material preparation side to form one or more of high rigidity, the ceramic enhancement phase of high elastic modulus to enhance magnesium alloy
Method.It inside thinks of a way and prepares particle and avoid surface contaminated, improve the wetability of reinforced phase and matrix alloy, reinforcement and matrix moisten
It is moist well high without interfacial reaction event interface bond strength, metal-base composites is prepared same using XD method
Under the conditions of its mechanical property generally all be higher than additional method preparation composite material.Since reaction in-situ can generate amount of heat, and
Magnesium alloy fused mass easily aoxidizes in air, burns, so to control in-situ reaction temperature cannot be excessively high, gives magnesium-based composite wood
The research of material brings great difficulty.
Pulsed magnetic field solidification processing technique has many advantages, such as pollution-free, easy to operate, significant effect, using extensive, by
The great attention of today's society.Although its mechanism of action and rule are also unclear, existing research is had shown that
The technology has very wide application prospect.It is small in alloy field about pulsed magnetic field at present to be fruitful, but to multiple
The relevant research of condensation material is also considerably less, is all largely about Al base position synthetic composite material, and about magnesium-based composite wood
The correlation of material is rarely reported.Li Guirong etc. has studied fabricated in situ (Al3Zr+Al2O3)p/ Al composite material applies high-frequency arteries and veins
Magnetic field is rushed, the oscillation and agitation of some strength make solute heat and mass and diffusion, Al3Zr、Al2O3Particle disperse point in collective
Cloth is uniform；Pulse magnetic field treatment aluminum matrix composite, the Al of Dispersed precipitate2O3Around " high density, multiform looks " spy around particle
The dislocation of sign, high density dislocation help to improve the strength of materials.License has studied Al-ZrSiO4System fabricated in situ composite wood
Material is applying 0.05T pulsed magnetic field, after handling 15-20min, the Al of synthesis3Zr and Al2O3Enhance particle uniformly and Dispersed precipitate
In Al matrix, and it is 163.6MPa that tensile strength, which reaches maximum value, than not handling raising 28%.Clock Longhua etc. is to TiB2/
7055 based composites apply 0.07T pulsed magnetic field intensity, and magnetic field handles lower reaction in-situ faster more sufficiently, particle dispersion distribution
In the base, material mechanical performance reaches maximum pulling strength herein and 7.4% and 8.0% is respectively increased in elongation percentage.
The research that pulsed magnetic field influences Al base position synthetic composite material is more mature, and magnetic field influences alloy graining process
It is similar in principle, magnesium alloy than aluminium alloy superiority, so exploitation pulse magnetic field treatment magnesium-based composite material right and wrong
Often it is necessary to, the influence that SiC particulate is distributed in magnesium-based composite material using pulsed magnetic field, for further improve SiC particulate
New approach is opened up in the forming of magnesium-based composite material and service performance.The studies above is not involved with SiC in experimental material
Magnesium-based composite material, the research for the influence being distributed in magnesium-based composite material to SiC particulate about pulsed magnetic field is also in blank rank
Section, the present invention have it is practical, work efficiency is high, easy to operate, so the invention be it is very significant, be worth research.
Summary of the invention
The purpose of the present invention is to provide a kind of low-voltage pulse magnetic fields to act on lower improvement SiC particulate in magnesium-based composite material
The method of distribution, this method is environmentally protective, simple process, easy to operate, easily controllable, and cost and small investment are pollution-free.
The present invention is achieved like this, it is characterized in that: first SiC particulate is added in magnesium alloy fused mass, is stirred evenly,
Then alloy melt is poured into the mold for being placed in pulsed magnetic field coagulation system, makes Composite Melt in low-voltage pulse magnetic field
The lower solidification completely of effect.
The present invention is realized using step in detail below:
(1) fusing of alloy carries out alloy melting and refining, and keep the temperature at a certain temperature in melting furnace；
(2) SiC particulate of preheating is added in melt alloy for the addition of SiC particulate, while being stirred uniformly；
(3) melt cooling velocity adjusts, and adjusts mold preheating temperature and pouring temperature according to actual needs；
(4) pulsed magnetic field is set, and adjusts pulsed magnetic field intensity and frequency according to experimental program；
(5) pulsed magnetic field solidifies, and melt cast to being placed in the mold of pulsed magnetic field coagulation system, opens immediately after casting
The control device for opening pulsed magnetic field solidifies melt completely under pulsed magnetic field action, compound in magnesium-based so as to improve SiC particulate
Distribution in material.
The principle of the present invention: since high-intensitive energy can be transmitted in melt by pulsed magnetic field indirectly, melt by
Compel vibration, agitation, therefore, apply pulsed magnetic field in the process of setting of composite material, will it is microcosmic to SiC particulate it is upper generate it is obvious
It influences.It is the distribution for improving it macroscopically by mechanical stirring, particle is in part due to electrical attraction power between SiC particulate
Or reunite, therefore by changing magnetic field strength, while controlling the setting rate of alloy, so that it may effectively improve SiC particulate
Distribution in magnesium-based composite material.
The present invention controls the setting rate of alloy by changing pouring temperature and the mold preheating temperature of melt.
Technological parameter of the invention:
1. mold preheating temperature.Mold preheating temperature influences the cooling capacity of alloy and magnetic field handles time, mold preheating
Temperature is higher, and the cooling velocity of alloy is smaller, and it is longer that magnetic field handles the time.Mold preheating temperature range is room temperature~600 DEG C.
2. pouring temperature.Pouring temperature influences the degree of supercooling of alloy and magnetic field handles the time, and pouring temperature is lower, degree of supercooling
Bigger, grain refinement effect is best, in the range of 620~710 DEG C.
3. field voltage.The intensity of the forced vibration of voltage influence melt, agitation.Field voltage range is 0~400V.
4. field frequency.Frequency equally influences the intensity of melt forced vibration, agitation.Field frequency range is 1~10Hz.
The invention has the advantages that (1) is environmentally protective, simple process, easy to operate, easily controllable, cost and small investment, it should
Method only needs the intensity of pulse magnetic field and the solidification rate of alloy to be controlled；(2) pollution-free, pulsed magnetic field does not connect directly
Alloy melt is touched, pollution will not be generated to melt, pollution will not be generated to environment；(3) the upper relatively common system of production at present
Standby composite material is prepared using mechanical mixing method, has liquid cave, volume gas in preparation process, and the oscillation that pulsed magnetic field generates can be with
Effectively make up this disadvantage.
Detailed description of the invention
Fig. 1 is the schematic device that SiC particulate is distributed in magnesium-based composite material under pulsed magnetic field action of the present invention.
Fig. 2 is the SEM figure for not handling the microstructure of SiC particulate enhancing magnesium-based composite material.
Fig. 3 is the SEM figure for applying pulse magnetic field treatment SiC particulate enhancing magnesium-based composite material microstructure.
In Fig. 1,1, mold, 2, metal bath, 3, actuating coil, 4 fire resisting brick plinths.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with Detailed description of the invention, but the present embodiment is not used to limit
The system present invention, it is all using similar structure and its similar variation of the invention, protection scope of the present invention should all be included in.
As shown in Figure 1, the apparatus structure that SiC particulate is distributed in AZ91D basis material under pulsed magnetic field action of the present invention
Including actuating coil 3, mold 1, metal bath 2 and fire resisting brick plinth 4；Metal bath 2 is poured into the mold 1 in actuating coil 3
Interior, the pulsed magnetic field action that actuating coil 3 generates solidifies composite material under pulsed magnetic field action in metal bath 2, wherein
Fire resisting brick plinth 4, which rises, prevents ingot casting Quench and supporting role.
The particle distribution uniformity for applying pulse magnetic field treatment known to Fig. 2, Fig. 3 is better than non-treated, pulse magnetic field treatment
Can obviously improve the microcosmic upper distributing homogeneity of SiC particulate.
Embodiment 1
First SiC particulate is added in magnesium alloy fused mass, is stirred evenly, then alloy melt is poured into and is placed in pulsed magnetic
In the mold of field coagulation system, solidify Composite Melt completely under pulsed magnetic field action；Wherein, field voltage is
150V, frequency 2.5Hz, the pouring temperature of melt are 680 DEG C, and mold preheating temperature is 200 DEG C.
Embodiment 2
First SiC particulate is added in magnesium alloy fused mass, is stirred evenly, then alloy melt is poured into and is placed in pulsed magnetic
In the mold of field coagulation system, solidify Composite Melt completely under pulsed magnetic field action；Wherein, field voltage is
200V, frequency 5Hz, the pouring temperature of melt are 620 DEG C, and mold preheating temperature is 600 DEG C.
Embodiment 3
First SiC particulate is added in magnesium alloy fused mass, is stirred evenly, then alloy melt is poured into and is placed in pulsed magnetic
In the mold of field coagulation system, solidify Composite Melt completely under pulsed magnetic field action；Wherein, field voltage is
250V, frequency 10Hz, the pouring temperature of melt are 650 DEG C, and mold preheating temperature is 400 DEG C.
Embodiment 4
First SiC particulate is added in magnesium alloy fused mass, is stirred evenly, then alloy melt is poured into and is placed in pulsed magnetic
In the mold of field coagulation system, solidify Composite Melt completely under pulsed magnetic field action；Wherein, field voltage is
400V, frequency 1Hz, the pouring temperature of melt are 710 DEG C, and mold preheating temperature is room temperature.
Claims (1)
1. a kind of low-voltage pulse magnetic field effect is lower to improve the method that SiC particle is distributed in magnesium-based composite material, it is characterized in that:
First SiC particle is added in magnesium alloy fused mass, is stirred evenly, then alloy melt is poured into and is placed in pulsed magnetic field solidification
In the mold of device, solidify Composite Melt completely under low-voltage pulse magnetic field effect；
The lower method for improving SiC particle and being distributed in magnesium-based composite material of low-voltage pulse magnetic field effect, using walking in detail below
Rapid to realize: (1) fusing of alloy carries out alloy melting and refining, and keep the temperature at a certain temperature in melting furnace；
(2) SiC particulate of preheating is added in melt alloy for the addition of SiC particulate, while being stirred uniformly；(3) melt is cooling
Speed adjustment, adjusts mold preheating temperature and pouring temperature according to actual needs；(4) pulsed magnetic field is set, according to experimental program
Adjust pulsed magnetic field intensity and frequency；(5) pulsed magnetic field solidifies, melt cast to the mould for being placed in pulsed magnetic field coagulation system
In tool, the control device in unbalanced pulse magnetic field immediately after casting solidifies melt completely under pulsed magnetic field action, so as to improve
Distribution of the SiC particulate in magnesium-based composite material；
The voltage in the magnetic field is 0~400V, and frequency is 1~10Hz, and the pouring temperature of melt is 620~710 DEG C, mold preheating
Temperature is room temperature~600 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410123403.5A CN103924116B (en) | 2014-03-31 | 2014-03-31 | A kind of low-voltage pulse magnetic field effect is lower to improve the method that SiC particulate is distributed in magnesium-based composite material |
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| CN201410123403.5A CN103924116B (en) | 2014-03-31 | 2014-03-31 | A kind of low-voltage pulse magnetic field effect is lower to improve the method that SiC particulate is distributed in magnesium-based composite material |
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| CN105063446B (en) * | 2015-08-12 | 2017-09-19 | 中国兵器工业第五九研究所 | A kind of particle reinforced magnesium base compound material preparation method |
| CN109266894B (en) * | 2018-09-27 | 2021-04-13 | 太原科技大学 | SiCPPreparation method of reinforced magnesium-based composite material |
| CN109022886B (en) * | 2018-09-27 | 2020-11-24 | 太原科技大学 | SiCPPreparation method of reinforced copper-based composite material |
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| CN101717905B (en) * | 2009-12-04 | 2013-11-20 | 江苏大学 | Method and device for preparing high-performance aluminum-base composite material under the action of pulsed magnetic field |
| CN102121074B (en) * | 2011-04-15 | 2012-11-07 | 江苏大学 | Method for preparing nano particle enhanced magnesium-based composite material |
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