CN111686641A - Stirring preparation device and preparation method of submicron ceramic particle reinforced aluminum matrix composite - Google Patents
Stirring preparation device and preparation method of submicron ceramic particle reinforced aluminum matrix composite Download PDFInfo
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- CN111686641A CN111686641A CN202010491537.8A CN202010491537A CN111686641A CN 111686641 A CN111686641 A CN 111686641A CN 202010491537 A CN202010491537 A CN 202010491537A CN 111686641 A CN111686641 A CN 111686641A
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- 238000003756 stirring Methods 0.000 title claims abstract description 92
- 239000002245 particle Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000000919 ceramic Substances 0.000 title claims abstract description 22
- 239000011159 matrix material Substances 0.000 title claims abstract description 21
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000000265 homogenisation Methods 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910002804 graphite Inorganic materials 0.000 claims description 19
- 239000010439 graphite Substances 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 19
- 230000008093 supporting effect Effects 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 4
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- -1 preserving the heat Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 238000010008 shearing Methods 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 3
- 238000004220 aggregation Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000002604 ultrasonography Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229910020491 K2TiF6 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011156 metal matrix composite Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/805—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis wherein the stirrers or the receptacles are moved in order to bring them into operative position; Means for fixing the receptacle
- B01F27/806—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis wherein the stirrers or the receptacles are moved in order to bring them into operative position; Means for fixing the receptacle with vertical displacement of the stirrer, e.g. in combination with means for pivoting the stirrer about a vertical axis in order to co-operate with different receptacles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
- B01F31/80—Mixing by means of high-frequency vibrations above one kHz, e.g. ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/50—Mixing receptacles
- B01F35/53—Mixing receptacles characterised by the configuration of the interior, e.g. baffles for facilitating the mixing of components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/55—Baffles; Flow breakers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
- B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
-
- 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
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/26—Mixing ingredients for casting metals
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Abstract
The invention discloses a stirring preparation device and a preparation method of a submicron ceramic particle reinforced aluminum matrix composite, which utilize a vibration motor to generate mechanical vibration force to promote the submicron ceramic particles to fall quantitatively, thereby realizing the continuous and uniform addition of the particles; the added particles are scattered by using a shearing force formed by the stirring blade at the upper end and the scattering baffle plate, and the aluminum alloy melt at the bottom of the crucible is stirred to flow upwards by using the stirring blade at the lower end, so that the dispersion and primary homogenization of the particles are realized; and then, removing air entering the aluminum alloy melt in the stirring process by using high-energy ultrasound, eliminating aggregation generated by combination of particles and the air, reducing the gas content of the composite material melt, realizing uniform particle distribution and improving the quality of the composite material melt.
Description
Technical Field
The invention relates to the field of stirring preparation devices for metal matrix composites, in particular to a stirring preparation device for submicron ceramic particle reinforced aluminum matrix composites and a preparation method thereof.
Background
Particle-reinforced aluminum matrix composites (PAMCs) have the characteristics of high specific strength, high thermal conductivity, low thermal expansion, wear resistance and the like, and have gained a great deal of important applications in the fields of aviation, aerospace, automobiles, electronics, military equipment and the like. The stirring casting method has the advantages of simple required equipment, convenient operation, high production efficiency and the like, is particularly suitable for industrial large-scale production, and is the PAMCs preparation method with the greatest development prospect at present. With the wide application of PAMCs, the requirements on the strength, the ductility and other properties of the PAMCs are further improved, and the particle size of the reinforced particles is inevitably changed from micron scale to submicron and nanometer scale. However, after the particle size of the reinforced particles is reduced, the molecular force between particles and the specific surface area of the particles are increased, so that the problems of difficult particle blanking, uneven distribution, interface reaction and the like are easily generated in the stirring preparation process, and the development and application of PAMCs are severely restricted.
According to patent publication No. 103031463a, entitled an apparatus and method for preparing a nano-ceramic particle-reinforced aluminum matrix composite; the patent publication No. 107058785A is named as a preparation method of SiC particle reinforced aluminum matrix composite; and the literature is a preparation method and the current research situation (material report) of the particle reinforced aluminum matrix composite, and analysis shows that the existing PAMCs stirring preparation device mainly adopts a funnel method to add particles and utilizes a stirring paddle to generate shearing force to disperse the particles, and the following defects exist:
(1) the submicron particles (with the particle size of 100-1000 nm) are difficult to automatically fall to a funnel opening under the self-gravity action due to large molecular acting force among the particles, so that continuous quantitative addition of reinforced particles cannot be realized, and the quality stability of the prepared PAMCs melt is low.
(2) In the stirring preparation process, the melt, the paddle and the inner wall of the crucible are promoted to generate shearing force to disperse the particles mainly under the stirring action, but the melt generates high-speed rotation movement in the same direction as the stirring paddle after the stirring paddle is stable in speed, so that the effect of reducing the shearing force to disperse the particles is poor.
(3) Air adsorbed on the surfaces of the particles enters the aluminum alloy melt along with the particles under the stirring action, so that the gas content of the composite material melt is increased, and the air is easy to combine with the particles to generate aggregation after entering the melt, so that the prepared PAMCs have high porosity and uneven particle distribution.
Therefore, the PAMCs stirring preparation device and the preparation method which have the advantages of quantitative uniform-speed addition of the submicron ceramic particles, strengthened stirring and shearing effects and good degassing effects are developed, and the PAMCs stirring preparation device and the preparation method have important significance.
Disclosure of Invention
The invention aims to overcome the defects of the existing stirring and casting preparation device for the particle-reinforced aluminum-based composite material, and provides a stirring preparation device and a stirring preparation method for a submicron ceramic particle-reinforced aluminum-based composite material, so that the quantitative uniform-speed addition and uniform distribution of submicron ceramic particles and the reduction of the porosity of the composite material are realized.
The invention is realized by the following technical scheme:
a stirring preparation device for submicron ceramic particle reinforced aluminum matrix composite comprises a furnace body, a graphite crucible, a stirring head, a scattering baffle, a furnace cover, a vibrating motor, a vibrating spring, a feeding hopper, a stirring motor, a supporting rocker arm, a positioning nut, a lifting motor, a fixing nut and a lifting mechanism;
in resistance furnace body was arranged in to graphite crucible, the enclosure space that bell and furnace body formed, in the stirring head passed the bell and got into graphite crucible, broken up the baffle and fix on the bell and insert graphite crucible bottom perpendicularly, on vibrating spring was arranged in to feeding funnel, vibrating spring fixed on the bell, vibrating motor was fixed in feeding funnel bottom, the stirring head passes through the puddler and is connected with agitator motor, agitator motor is fixed in on supporting the rocking arm, it fixes on the furnace body to support the rocking arm through elevating system.
The stirring head comprises two-stage stirring blades, and the diameter of the upper-end stirring blade is larger than that of the lower-end stirring blade.
The furnace cover is composed of two symmetrical semicircular plates, one end of each semicircular plate is fixed on one side of the lifting mechanism, the other end of each semicircular plate is provided with a handle which can be freely opened and closed, and the furnace cover is provided with an observation window, a protective gas inlet pipe, a feed hole, a stirring rod hole and a scattering baffle jack.
The supporting rocker arm comprises a fixed section and a telescopic section, the fixed section is connected with the lifting mechanism through a guide sleeve and a screw rod and is fixed by a fixing nut, and the telescopic section is connected with the fixed section through a positioning nut.
The lifting mechanism adopts a guide pillar, a guide sleeve and a screw rod structure, the guide pillar is fixed on the furnace body, the lifting motor supporting platform is connected with the guide pillar through the guide sleeve, and the output shaft of the lifting motor is connected with the screw rod.
The method for preparing the submicron ceramic particle reinforced aluminum matrix composite material by adopting the device comprises the following steps:
the method comprises the following steps: adding aluminum alloy into the graphite crucible, heating and melting, adding a refining agent for degassing and deslagging; heating to 79 deg.C, adding appropriate amount of KTiF6Forming a covering layer on the surface of the aluminum alloy melt by using the reagent;
step two: starting a gas protection device, and enabling argon to enter a hearth through a furnace cover air inlet pipe to enable the aluminum alloy melt to be under the protection of an argon atmosphere;
step three: rotating the support rocker arm and loosening the positioning nut to enable the stirring blade of the stirring head to be aligned to the center of the graphite crucible; loosening the fixing nut to start the lifting motor to adjust the lifting mechanism, and lowering the upper end stirring blade below the surface of the aluminum alloy melt; inserting the scattering baffle into the aluminum alloy melt and fixing the scattering baffle on the furnace cover;
step four: reducing the temperature of the aluminum alloy melt to the liquidus temperature, starting a stirring motor, and adjusting the rotation speed of the motor to form a stable vortex on the surface of the aluminum alloy melt;
step five: placing the reinforced particles in a feeding hopper, starting a vibration motor, and adjusting the exciting force of the vibration motor to enable the particles to be added at a uniform speed;
step six: after the reinforcing particles are added, the vibration motor and the stirring motor are closed, and the lifting motor is started to adjust the lifting mechanism so as to move the stirring head out of the furnace body of the resistance furnace; taking down the scattering baffle from the furnace cover;
step seven: inserting a high-energy ultrasonic probe through a stirring rod hole of a furnace cover, applying ultrasonic action to degas, and promoting the reinforcing particles to be uniformly distributed in the aluminum alloy melt;
step eight: and (3) moving out the ultrasonic probe after the homogenization of the reinforced particles is finished, closing an air outlet valve of an argon cylinder, regulating the temperature of the melt, preserving the heat, and finishing the preparation of the submicron ceramic particle reinforced aluminum matrix composite.
The invention has the beneficial effects that: the invention overcomes the problem that the particles are difficult to automatically fall to the funnel opening when the reinforced particles are added by adopting a funnel method, and utilizes the mechanical vibration force generated by the vibration motor to promote the submicron ceramic particles to fall, thereby realizing the continuous and quantitative addition of the particles.
The stirring head adopts two-stage stirring blades, the stirring blades at the upper end and the scattering baffle form strong stirring shearing force to scatter the added particles, and the stirring blades at the lower end are used for stirring the aluminum alloy melt at the bottom of the crucible to flow upwards, so that the dispersion and primary homogenization of the particles are realized.
The invention utilizes the acoustic cavitation, acoustic flow and stirring effect generated by high-energy ultrasound to remove air entering the aluminum alloy melt in the stirring process, eliminate aggregation generated by combination of particles and air, reduce the gas content of the composite material melt, realize uniform particle distribution and improve the quality of the composite material melt.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the overall structure of the preferred embodiment of the present invention.
Description of reference numerals:
the furnace comprises a furnace body 1, a graphite crucible 2, a stirring head 3, a scattering baffle 4, a furnace cover 5, a vibration motor 6, a vibration spring 7, a feeding funnel 8, a stirring motor 9, a supporting rocker arm 10, a positioning nut 11, a lifting motor 12, a fixing nut 13 and a lifting mechanism 14.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, in a preferred embodiment of the present invention, a stirring preparation apparatus for a submicron ceramic particle reinforced aluminum matrix composite material includes a furnace body 1, a graphite crucible 2, a stirring head 3, a scattering baffle 4, a furnace cover 5, a vibration motor 6, a vibration spring 7, a feeding funnel 8, a stirring motor 9, a support rocker arm 10, a positioning nut 11, a lifting motor 12, a fixing nut 13, and a lifting mechanism 14;
Stirring head 3 all adopts pure graphite material preparation with break up baffle 4, including doublestage stirring vane, and the upper end stirring vane diameter is greater than lower extreme stirring vane, and upper end stirring vane is 12mm with break up baffle 4 interval, and the granule that produces the shearing action and will add is broken up to the stirring in-process, and lower extreme stirring vane mainly used promotes crucible bottom fuse-element and produces the rising motion.
The utility model discloses a simple structure, including bell 5, elevating system 14, other end, bell 5, feed port, puddler, baffle jack, the bell is equipped with the handle and can freely open and shut, is equipped with observation window, protective gas intake pipe, feed port, puddler hole, breaks up the baffle jack, and the function is more, convenient to use by two symmetry semicircle boards group one end of semicircle board.
The supporting rocker arm 10 comprises a fixed section and a telescopic section, the fixed section is connected with a lifting mechanism 14 through a guide sleeve and a screw rod and is fixed by a fixing nut 13, and the telescopic section is connected with the fixed section through a positioning nut 11.
The lifting mechanism 14 adopts a guide post, a guide sleeve and a screw rod structure, the guide post is fixed on the furnace body 1, the supporting platform of the lifting motor 12 is connected with the guide post through the guide sleeve, and the output shaft of the lifting motor 12 is connected with the screw rod.
The method for preparing the submicron ceramic particle reinforced aluminum matrix composite material by adopting the device comprises the following steps:
the method comprises the following steps: 6061 is selected as a matrix aluminum alloy, SiC particles with the average particle size of 500nm are used as reinforcing particles, 3Kg of 6061 block is added into the graphite crucible 2, the mixture is heated and melted, and refining agent is added at 710 ℃ for degassing and deslagging; heating to 790 ℃, adding a proper amount of K2TiF6Forming a covering layer on the surface of the aluminum alloy melt by using the reagent;
step two: starting a gas protection device, and introducing argon into a hearth through an air inlet pipe 5 of a furnace cover so as to enable the aluminum alloy melt to be under the protection of argon atmosphere;
step three: rotating the supporting rocker arm 10 and loosening the positioning nut 11 to enable the stirring blade of the stirring head 3 to be aligned with the center of the graphite crucible 2; loosening the fixing nut 13 to start the lifting motor 12 to adjust the lifting mechanism 14, and lowering the upper end stirring blade to 35mm below the surface of the aluminum alloy melt; inserting the scattering baffle 4 into the aluminum alloy melt and fixing the scattering baffle on a furnace cover 5;
step four: reducing the temperature of the aluminum alloy melt to 670 ℃, starting a stirring motor 9, and adjusting the rotation speed of the motor to form a stable vortex on the surface of the aluminum alloy melt;
step five: placing 300g of SiC particles in a feeding hopper 8, starting a vibration motor 6, and adjusting the exciting force of the vibration motor to ensure that the particle conveying speed is 30 g/min;
step six: after the reinforcing particles are added, the vibration motor 6 and the stirring motor 9 are closed, and the lifting motor 12 is started to adjust the lifting mechanism 14 so as to move the stirring head 3 out of the resistance furnace body 1; taking down the scattering baffle 4 from the furnace cover 5;
step seven: inserting a high-energy ultrasonic probe through a stirring rod hole of a furnace cover 5, applying ultrasonic power of 700W, frequency of 20KHz and ultrasonic action time of 15min, removing gas in the melt, and promoting uniform distribution of SiC particles in the aluminum alloy melt;
step eight: and (3) moving out the ultrasonic probe after the homogenization of the reinforced particles is finished, closing an air outlet valve of an argon cylinder, keeping the melt temperature at 710 ℃, and finishing the preparation of the submicron ceramic particle reinforced aluminum matrix composite material.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by basically the same means are all within the protection scope of the present invention.
Claims (5)
1. A submicron ceramic particle reinforced aluminum matrix composite material stirring preparation device is characterized in that: the device comprises a furnace body, a graphite crucible, a stirring head, a scattering baffle, a furnace cover, a vibrating motor, a vibrating spring, a feeding funnel, a stirring motor, a supporting rocker arm, a positioning nut, a lifting motor, a fixing nut and a lifting mechanism;
the graphite crucible is arranged in a furnace body of the resistance furnace, a closed space is formed between the furnace cover and the furnace body, the stirring head passes through the furnace cover to enter the graphite crucible, the scattering baffle is fixed on the furnace cover and is vertically inserted into the bottom of the graphite crucible, the feeding hopper is arranged on the vibration spring, the vibration spring is fixed on the furnace cover, the vibration motor is fixed at the bottom of the feeding hopper, the stirring head is connected with the stirring motor through the stirring rod, the stirring motor is fixed on the supporting rocker arm, and the supporting rocker arm is fixed on the furnace body through the lifting mechanism;
the stirring head comprises two-stage stirring blades, and the diameter of the upper-end stirring blade is larger than that of the lower-end stirring blade.
2. The apparatus for preparing a sub-micron ceramic particle reinforced aluminum matrix composite by stirring as claimed in, wherein: the furnace cover consists of two symmetrical semicircular plates, one end of each semicircular plate is fixed on one side of the lifting mechanism, the other end of each semicircular plate is provided with a handle which can be freely opened and closed, and the furnace cover is provided with an observation window, a protective gas inlet pipe, a feed hole, a stirring rod hole and a scattering baffle jack.
3. The apparatus for preparing a sub-micron ceramic particle reinforced aluminum matrix composite by stirring as claimed in, wherein: the supporting rocker arm comprises a fixed section and a telescopic section, the fixed section is connected with the lifting mechanism through a guide sleeve and a screw rod and is fixed by a fixing nut, and the telescopic section is connected with the fixed section through a positioning nut.
4. The apparatus for preparing a sub-micron ceramic particle reinforced aluminum matrix composite by stirring as claimed in, wherein: the lifting mechanism adopts a guide pillar, a guide sleeve and a screw rod structure, the guide pillar is fixed on the furnace body, the lifting motor supporting platform is connected with the guide pillar through the guide sleeve, and the output shaft of the lifting motor is connected with the screw rod.
5. A method of making a sub-micron ceramic particle reinforced aluminium matrix composite material according to the apparatus of any one of claims:
the method comprises the following steps: adding aluminum alloy into the graphite crucible, heating and melting, adding a refining agent for degassing and deslagging; heating to 0 ℃, adding a proper amount of KTiF reagent to form a covering layer on the surface of the aluminum alloy melt;
step two: starting a gas protection device, and enabling argon to enter a hearth through a furnace cover air inlet pipe to enable the aluminum alloy melt to be under the protection of an argon atmosphere;
step three: rotating the support rocker arm and loosening the positioning nut to enable the stirring blade of the stirring head to be aligned to the center of the graphite crucible; loosening the fixing nut to start the lifting motor to adjust the lifting mechanism, and lowering the upper end stirring blade below the surface of the aluminum alloy melt; inserting the scattering baffle into the aluminum alloy melt and fixing the scattering baffle on the furnace cover;
step four: reducing the temperature of the aluminum alloy melt to the liquidus temperature, starting a stirring motor, and adjusting the rotation speed of the motor to form a stable vortex on the surface of the aluminum alloy melt;
step five: placing the reinforced particles in a feeding hopper, starting a vibration motor, and adjusting the exciting force of the vibration motor to enable the particles to be added at a uniform speed;
step six: after the reinforcing particles are added, the vibration motor and the stirring motor are closed, and the lifting motor is started to adjust the lifting mechanism so as to move the stirring head out of the furnace body of the resistance furnace; taking down the scattering baffle from the furnace cover;
step seven: inserting a high-energy ultrasonic probe through a stirring rod hole of a furnace cover, applying ultrasonic action to degas, and promoting the reinforcing particles to be uniformly distributed in the aluminum alloy melt;
step eight: and (3) moving out the ultrasonic probe after the homogenization of the reinforced particles is finished, closing an air outlet valve of an argon cylinder, regulating the temperature of the melt, preserving the heat, and finishing the preparation of the submicron ceramic particle reinforced aluminum matrix composite.
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