CN113046592B - In-situ synthesis device and method for aluminum-based composite material with reinforced particle gradient distribution - Google Patents

In-situ synthesis device and method for aluminum-based composite material with reinforced particle gradient distribution Download PDF

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CN113046592B
CN113046592B CN202110280652.5A CN202110280652A CN113046592B CN 113046592 B CN113046592 B CN 113046592B CN 202110280652 A CN202110280652 A CN 202110280652A CN 113046592 B CN113046592 B CN 113046592B
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furnace
situ synthesis
composite material
gradient
aluminum
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CN113046592A (en
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曾一达
卢冯恺
郭正华
陈玉华
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Nanchang Hangkong University
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Nanchang Hangkong University
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Abstract

The invention discloses an in-situ synthesis device and method for an aluminum-based composite material with reinforced particle gradient distribution, comprising a casting mould, a resistance furnace for in-situ synthesis composite material and a gradient material preparation resistance furnace, wherein the preparation is carried out by heating and preserving the temperature in the gradient material preparation resistance furnace, then carrying out in-situ synthesis reaction of aluminum alloy and reinforced phase particles in the in-situ synthesis resistance furnace, taking out the melt after reaction, pouring the melt into the preserving casting mould in the gradient material preparation resistance furnace, so that the reinforced particles in the melt have time to fully perform sedimentation behavior, discharging from the furnace to be cooled and solidified after the sedimentation is finished, thus obtaining the aluminum-based composite material with particle gradient distribution, and the preparation method has the advantages of wide industrial practicability, simple structure, convenient operation and low cost.

Description

In-situ synthesis device and method for aluminum-based composite material with reinforced particle gradient distribution
Technical Field
The invention relates to the technical field of preparation of metal matrix composite materials, in particular to an in-situ synthesis device and method for an aluminum matrix composite material with reinforced particle gradient distribution.
Background
The superior performance of the particle reinforced aluminum-based composite material becomes one of research hot spots of metal-based composite materials, and the current preparation method of the particle reinforced aluminum-based composite material mainly comprises a liquid phase method, a solid-liquid two-phase method and a solid phase method. The interface between the melt matrix and the reinforcement is easy to react when the liquid phase method is used for preparation; if the wettability of the melt matrix and reinforcement is poor, the reinforcement is difficult to add and can easily carry contaminants. The in-situ synthesis method is a method for preparing the aluminum-based composite material commonly used at present, and can eliminate pollutants attached to the added particles in the in-situ reaction process, so that the surfaces of the obtained material particles are pollution-free, and the wetting problem between the matrix and the reinforced particles is solved. The in-situ synthesis process comprises the following steps: firstly heating an aluminum alloy matrix to a molten state, uniformly mixing reinforced particles according to a proper proportion, drying, placing into a reaction molten pool, mechanically stirring, refining, skimming slag, and finally pouring into a mould for casting and molding after the reaction is finished to obtain a composite material finished product.
Compared with the common aluminum-based composite material, the aluminum-based composite material with gradient distribution of reinforced phase particles has the advantages of high specific strength and specific rigidity, low density, excellent wear resistance, stable transition of thermal stress in the material and the like, gradient layering can be realized in structure, reinforced particles are gradually reduced from the outer wall to the inner layer, and the inner layer is free of or has a small amount of reinforced particles, so that the outer layer of the material has good mechanical properties such as higher tensile strength and the like, is rich in more reinforced particles than the inner layer, has high hardness, good heat conductivity, thermal stability and excellent wear resistance, and has application prospects in the fields of nuclear energy, electronics, optics, chemistry, electromagnetism, building curtain walls and the like with high performance requirements on the surface of aluminum alloy.
Of course, the gradient composite material has high preparation difficulty because of the requirement of the gradient composite material on the continuous gradient distribution of the reinforced particles, and the internal composition and the change of the microstructure are required to be continuously controlled, so that the interface between layers is eliminated, the thermal stress is relaxed, and the preparation difficulty is high. If the traditional in-situ synthesis method is adopted to prepare the aluminum-based composite material with high surface volume fraction, a large amount of reactants are added to synthesize the reinforcing phase due to the gradient-free dispersion effect of the reinforcing phase, so that the reinforcing phase content required by the design can be obtained on the surface of the material, and the particle agglomeration phenomenon is difficult to avoid due to the fact that a large amount of microscopic particles are synthesized in an aluminum alloy matrix, and the phenomenon has negative influence on the mechanical property of the whole composite material. Therefore, the preparation methods of the conventional particle gradient distribution composite materials comprise a centrifugal casting method, an external gradient strong magnetic field, a powder metallurgy method and other special sintering methods. The centrifugal casting method is not suitable for pouring, and alloys such as aluminum and magnesium with specific gravity segregation are easy to generate, the gradient level of the reinforced phase distribution of the external magnetic field method is not high, the density of the material prepared by the powder metallurgy method is low, the combination of the matrix is poor, and pores are easy to generate. And the preparation cost of special sintering methods such as powder metallurgy is high as the preparation of an external gradient strong magnetic field, and the preparation method is not suitable for mass production.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a method for synthesizing an aluminum-based composite material with gradient distribution of particles in situ.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the utility model provides an aluminium base combined material normal position synthesizer of reinforcing granule gradient distribution, includes normal position combined material and prepares resistance furnace with resistance furnace and gradient material, gradient material prepares resistance furnace and includes furnace body and resistance wire, the resistance wire is coil form and inlays on the furnace body inner wall, be provided with the furnace gate on the furnace body, furnace gate upper surface one side both ends are equipped with and take the round hole to remove the seat, opposite side both ends correspond the position and are equipped with and take the round hole connecting piece, dispose the cylinder stick level and insert take the round hole of round hole connecting piece, be provided with the support in the furnace body, be provided with casting die on the support, casting die includes mould body, lug screw and clamping device, be provided with the flange on the mould body, flange lower extreme both sides narrow limit central point puts and is provided with the recess, be provided with on the four corners position of flange upper end with lug screw matched with countersunk screw hole, the clamping device is last still to be provided with the hook screw is agreed with
Preferably, the inner wall of the casting mould is 200mm long, 150mm wide, 5mm thick and 50mm deep, and the flange is 240mm long, 190mm wide and 15mm high; and the lower part of the flange is internally and reversely molded by 10 degrees, the nominal diameter M16 of the meshing area of the countersunk threaded hole and the lifting lug screw is equal to the radius dimension R=5mm, and the integral casting die is formed by rolling No. 45 steel.
The invention also discloses a preparation method of the aluminum-based composite material for enhancing the gradient distribution of particles, which comprises the following steps:
a. Heating and preserving the casting mould in a gradient material preparation resistance furnace;
b. Carrying out in-situ synthesis reaction of aluminum alloy and reinforced phase particles in a resistance furnace for in-situ synthesis of the composite material;
c. taking out the melt after the reaction, pouring the melt into a casting mould, and preserving heat to enable reinforced particles in the melt to fully perform sedimentation behavior;
d. And discharging from the furnace to cool and solidify.
Preferably, the temperature of the heat preservation in the step c is 700-720 ℃, and the heat preservation time is 6 minutes.
Preferably, the cooling mode in the step d is air cooling or water cooling, and when water cooling is used, the water level needs to be controlled to just overflow the melt position in the die body by combining the prepared material melt quantity in advance.
The invention has the beneficial effects that:
(1) According to the invention, by utilizing the sedimentation behavior of the particles, a large amount of precipitation of reinforcing phase particles generated by in-situ reaction is concentrated at the bottom of the casting mold through the novel device, namely the surface of the molding material, so that the wear resistance of the surface of the material is effectively improved. In addition, the particle agglomeration phenomenon caused by adding a large amount of reactants and synthesizing reinforcing particles during in-situ synthesis is avoided, and the mechanical property of the inner side of the material is ensured not to be negatively influenced.
(2) The gradient composite material is prepared by improving the in-situ reaction process, the preparation cost is lower than that of the common powder metallurgy method and other preparation methods, the preparation process is simple and convenient, and the preparation method is suitable for industrial production.
(3) According to the invention, a novel casting die is adopted to replace a traditional die, a die body is placed in a gradient material preparation resistance furnace in advance to be heated and insulated, after the reaction is finished, a melt is poured into the casting die, the solidification of the reaction melt is delayed under the insulated state, the reinforced particles are subjected to sedimentation behavior due to high density to realize gradient layering, and after a certain time of sedimentation, the material is discharged from the furnace to be cooled, and the prepared material is continuously layered from an outer layer to an inner layer of particles and has excellent performance.
(4) According to the invention, through the optimization of in-situ synthesis preparation equipment, the operation is more convenient, and the upper end of the novel casting mold can be rapidly cooled to achieve the expected particle sinking effect; meanwhile, the taking mode of the die is improved, clamping lifting lug screws are arranged at four corners of the upper end of the novel casting die flange, a special clamping device matched with the clamping lifting lug screws is adopted, and a groove is formed in the lower end of the flange, so that the moving process of the die is facilitated, and the equipment and the process have strong adaptability to workpieces and can be used for preparing various materials.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.
FIG. 1 is a schematic diagram of a gradient material preparation resistance furnace according to a preferred embodiment of the invention;
FIG. 2 is a schematic view showing a structure of a casting mold and a clamping device thereof according to the preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram and a schematic process flow diagram of an in-situ synthesis device for an aluminum-based composite material with enhanced particle gradient distribution according to a preferred embodiment of the invention.
The drawings are marked:
1-crucible 2-in situ synthesis resistance furnace 17-casting die for composite material is prepared by using a resistance furnace 3-die body 4-flange 5-countersunk threaded hole 6-lifting lug screw 7-groove 8-clamping device 9-furnace body 10-furnace door 11-moving seat with round hole 12-cylindrical rod 13-connecting piece with round hole 14-bracket 15-resistance wire 16-gradient material.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed 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 explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1-3, the in-situ synthesis device for aluminum-based composite materials for reinforcing gradient distribution of particles comprises a resistance furnace 2 for in-situ synthesis of composite materials and a gradient material preparation resistance furnace 16, wherein the gradient material preparation resistance furnace 16 comprises a furnace body 9 and a resistance wire 15, the resistance wire 15 is coiled and embedded on the inner wall of the furnace body 9, a furnace door 10 is arranged on the furnace body 9, two ends of one side of the upper surface of the furnace door 10 are provided with a movable seat 11 with round holes, two corresponding positions of the two ends of the other side are provided with connecting pieces 13 with round holes, two cylindrical rods 12 are configured to be tightly inserted along the directions of the corresponding central lines of the two round holes with the connecting pieces 13, the cylindrical rods 12 are pushed to drive a semicircular furnace door 10 to rotate and horizontally open and close along the connecting pieces 13 with the round holes, a bracket 14 is arranged in the furnace body 9, the bracket 14 comprises a circular cake-shaped plane and a support rod bracket distributed at the triangular position, a casting die 17 is arranged on the bracket 14, the casting die 17 is centrally placed on the upper part of the bracket 14 when being heated, the casting die 17 is opposite to a furnace mouth, the casting die 17 comprises a die body 3, the lifting lug 6 and a clamping flange 7 is arranged on the clamping flange 4 and a clamping flange 7 is correspondingly arranged on the clamping flange 4, and is correspondingly provided with a clamping flange 7.
The invention uses the sedimentation behavior of particles, and a large amount of reinforcing phase particles generated by in-situ reaction are concentrated at the bottom of the casting mould 17 through the novel device, namely the surface of the molding material, so that the wear resistance of the surface of the material is effectively improved, in addition, the particle agglomeration phenomenon caused by adding a large amount of reactants and synthesizing reinforcing particles during in-situ synthesis is avoided, and the mechanical property of the inner side of the material is ensured not to be negatively influenced; the preparation method is characterized in that the preparation cost is lower than that of the preparation method such as a common powder metallurgy method by improving an in-situ reaction process, the preparation process is simple and convenient, the preparation method is suitable for industrial production, a novel casting mould 17 is adopted to replace a traditional mould, a mould body 3 is placed in a gradient material preparation resistance furnace 16 in advance, heating and heat preservation are carried out, a melt is poured into the casting mould 17 after the reaction is finished, the reaction melt is delayed to solidify in a heat preservation state, gradient layering is realized by the sedimentation behavior of reinforced particles due to high density, and the prepared material is continuously layered and distributed from an outer layer to an inner layer of particles after sedimentation for a certain time and has excellent performance; the invention also optimizes the in-situ synthesis preparation equipment, so that the operation is more convenient, the upper end of the novel casting mould 17 adopts the design of the flange 4 baffle, water drops can be effectively prevented from splashing in under the condition of water cooling, a certain distance is kept between the water surface and the opening of the casting mould 17 when the outer wall of the casting mould 17 in the composite material melt area is completely immersed by water, and the rapid cooling is realized to achieve the expected particle sinking effect; meanwhile, the taking mode of the casting mould 17 is improved, lifting lug screws 6 are arranged at four corners of the upper end of the flange 4 of the novel casting mould 17, a special clamping device 8 matched with the lifting lug screws is adopted, and a groove 7 is arranged at the lower end of the flange 4, so that the moving process of the mould body 3 is facilitated; the equipment and the process have strong adaptability to workpieces, and can be used for preparing occasions of various materials.
Specifically, the resistance furnace 2 for in-situ synthesis composite materials of the present invention is a general standard component or a component known to those skilled in the art, and its structure and principle can be known by those skilled in the art through a technical manual or by conventional experimental methods, and can be flexibly selected by those skilled in the art as required, which is not described in detail herein.
As a preferred embodiment of the invention, it may also have the following additional technical features:
In this embodiment, the length of the inner wall of the casting mold 17 is 200mm, the width is 150mm, the wall thickness is 5mm, the depth is 50mm, the length of the flange 4 is 240mm, the width is 190mm, and the height is 15mm; the lower part of the flange 4 is internally inverted by 10 degrees, the nominal diameter M16 of the meshing area of the countersunk threaded hole 5 and the lifting lug screw 6, the round angle size R=5mm, and the integral casting die 17 is formed by rolling No. 45 steel, so that the casting die has the advantages of high temperature resistance and the like, the service life is prolonged, and the working state is more stable.
The invention also discloses a preparation method of the aluminum-based composite material for enhancing the gradient distribution of particles, which comprises the following steps:
a. Heating and insulating a casting mold 17 in a gradient material preparation resistance furnace 16;
b. in-situ synthesis reaction of aluminum alloy and reinforcing phase particles is carried out in a resistance furnace 2 for in-situ synthesis of composite materials;
c. pouring the melt after the reaction into a casting mould 17 for heat preservation, so that reinforced particles in the melt fully perform sedimentation behavior;
d. And discharging from the furnace to cool and solidify.
In this embodiment, the temperature of the heat preservation in the step c is 700-720 ℃ and the heat preservation time is 6 minutes.
In this embodiment, the cooling mode in the step d is air cooling or water cooling, and when water cooling is used, the water level needs to be controlled to just overflow the melt position in the die body 3 in advance according to the prepared melt amount of the material.
The specific implementation process of the invention comprises the following steps:
Firstly, two clamping devices 8 are used for respectively clamping lifting lug screws 6 corresponding to two sides of a casting die 17, the casting die 17 is carried to the inner support 14 of the gradient material preparation resistance furnace 16, and heating and heat preservation are started at the set temperature of 720 ℃. Adding an AA6061 matrix aluminum alloy matrix into a crucible 1, placing the crucible 1 on an inner support of a resistance furnace 2 for in-situ synthesis of a composite material, heating to melt aluminum alloy, taking a thermocouple to monitor the temperature of the melt to 850 ℃, adding KBF 4 and K 2ZrF6 particles which are mixed in proportion, and mechanically stirring to fully carry out the reaction; after the reaction is finished, adding a refining agent and skimming when the temperature of the melt is reduced to 750 ℃, taking out the crucible 1 when the temperature of the melt is reduced to 720 ℃, rapidly pouring the reaction melt into the die body 3 of the casting die 17 insulated in the gradient material preparation resistance furnace 16, maintaining the temperature at 700-720 ℃ for 6 minutes until the particles are settled, carrying the casting die 17 in a water tank by using the clamping device 8 for water cooling, cooling the casting die 17 and the composite material melt at the same time, and pouring out the material after solidification to obtain the aluminum-based composite material with gradient distribution of the particles.
In the examples, unless otherwise specified, the methods employed were conventional and the starting materials were commercially available from the public sources.
The above additional technical features can be freely combined and superimposed by a person skilled in the art without conflict.
The foregoing is only a preferred embodiment of the present invention, and all technical solutions for achieving the object of the present invention by substantially the same means are within the scope of the present invention.

Claims (2)

1. An aluminum-based composite material in-situ synthesis device for enhancing gradient distribution of particles is characterized in that: including normal position is resistance furnace (2) and gradient material preparation resistance furnace (16) for combined material, gradient material preparation resistance furnace (16) include furnace body (9) and resistance wire (15), resistance wire (15) are coil form and inlay on furnace body (9) inner wall, be provided with furnace gate (10) on furnace body (9), furnace gate (10) upper surface one side both ends are equipped with take round hole to remove seat (11), opposite side both ends correspond the position and are equipped with take round hole connecting piece (13), dispose cylinder stick (12) horizontal insertion take round hole of round hole connecting piece (13), be provided with support (14) in furnace body (9), be provided with casting mould (17) on support (14), casting mould (17) are including mould body (3), lug screw (6) and clamping device (8), be provided with flange (4) on mould body (3), flange (4) lower extreme both sides narrow limit central point put and are provided with recess (7), be provided with on flange (4) upper end four corners position with lug (6) matched with screw (5), install screw (8) on the clamp device.
2. The in-situ synthesis device for reinforcing gradient distribution of particles of an aluminum-based composite material according to claim 1, wherein the in-situ synthesis device is characterized in that: the inner wall of the casting die (17) is 200mm long, 150mm wide, 5mm thick and 50mm deep, and the flange (4) is 240mm long, 190mm wide and 15mm high; the lower part of the flange (4) is internally and reversely molded by 10 degrees, the nominal diameter M16 of the meshing area of the countersunk threaded hole (5) and the lifting lug screw (6) is equal to the radius size R=5mm, and the integral casting die (17) is formed by rolling No. 45 steel.
CN202110280652.5A 2021-03-16 In-situ synthesis device and method for aluminum-based composite material with reinforced particle gradient distribution Active CN113046592B (en)

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CN113046592B true CN113046592B (en) 2024-07-02

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104805318A (en) * 2015-04-15 2015-07-29 哈尔滨工业大学 Preparation method of spherical TC4 particle reinforced AZ91 magnesium matrix composite
CN215560568U (en) * 2021-03-16 2022-01-18 南昌航空大学 Aluminum matrix composite in-situ synthesis device with particle gradient distribution

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104805318A (en) * 2015-04-15 2015-07-29 哈尔滨工业大学 Preparation method of spherical TC4 particle reinforced AZ91 magnesium matrix composite
CN215560568U (en) * 2021-03-16 2022-01-18 南昌航空大学 Aluminum matrix composite in-situ synthesis device with particle gradient distribution

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