CN112626366A - Method for reducing porosity of particle-reinforced aluminum matrix composite prepared by stirring - Google Patents
Method for reducing porosity of particle-reinforced aluminum matrix composite prepared by stirring Download PDFInfo
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- CN112626366A CN112626366A CN202011412471.5A CN202011412471A CN112626366A CN 112626366 A CN112626366 A CN 112626366A CN 202011412471 A CN202011412471 A CN 202011412471A CN 112626366 A CN112626366 A CN 112626366A
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- Prior art keywords
- particle
- stirring
- composite material
- porosity
- reinforced aluminum
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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- 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
- C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
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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
- C22C32/0047—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 with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—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 with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
- C22C32/0063—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 with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on SiC
Abstract
The invention discloses a method for reducing the porosity of a particle-reinforced aluminum-based composite material prepared by stirring, which comprises the following steps of (1) heating the particle-reinforced aluminum-based composite material prepared by a semi-solid stirring method to a temperature 30-50 ℃ above the liquidus of a matrix aluminum alloy; (2) preheating the ultrasonic leading-in rod, and then placing the ultrasonic leading-in rod into a melt for high-energy ultrasonic treatment; (3) and standing the composite material melt subjected to ultrasonic treatment for 3-5 min, pouring the composite material melt into a preheated mold, simultaneously starting a pulse magnetic field device, and performing pulse magnetic field treatment until the melt is completely solidified to finally obtain the particle-reinforced aluminum-based composite material with low porosity. Aiming at the problems of a large number of air holes and shrinkage holes in PAMCs prepared by stirring, the invention adopts high-energy ultrasound and a pulsed magnetic field external field for treatment, and can greatly reduce the porosity of the composite material.
Description
Technical Field
The invention relates to the technical field of preparation of particle-reinforced aluminum-based composite materials, in particular to a method for reducing the porosity of a particle-reinforced aluminum-based composite material prepared by stirring.
Background
The particle reinforced aluminum matrix composite (PAMCs) have excellent comprehensive properties such as high strength, low density, wear resistance, high ductility and toughness, thermal stability and the like, and are listed as one of the most potential materials in the novel composite materials in the 21 st century. The PAMCs stirring casting method relies on strong stirring to form a vortex suction effect in the alloy liquid, introduces reinforcing body particles into the aluminum alloy liquid, and realizes uniform distribution of the reinforcing body particles, and is generally used for preparing composite materials with the volume percentage below 30 percent. The method has the advantages that: simple process, less equipment investment, high production efficiency, low manufacturing cost and large-scale production.
However, the viscosity of the melt is obviously increased after the reinforcing particles are added, the casting fluidity is obviously reduced, the heat conductivity coefficient is reduced, air and inclusions are brought by strong stirring and the addition of the particles, so that a large number of air holes and shrinkage cavities exist in PAMCs prepared by the method, and the mechanical property of the composite material is low. In order to solve the problems, the conventional method mainly reduces holes by secondary processing methods such as cold rolling and hot rolling, but cannot completely eliminate the influence of the holes, and the structure, the shape and the size of the manufactured part are limited to a certain extent. Therefore, the invention utilizes the auxiliary external field to develop a high-energy ultrasonic and pulsed magnetic field external field treatment process to reduce the porosity of PAMCs and provide technical reference for preparing high-quality PAMCs by a stirring casting method.
Disclosure of Invention
The invention aims to solve the problems that: the method for reducing the porosity of the particle-reinforced aluminum-based composite material prepared by stirring is provided, aiming at the problems of a large number of pores and shrinkage cavities in PAMCs prepared by stirring, high-energy ultrasound and a pulsed magnetic field external field are adopted for processing, and the porosity of the composite material can be greatly reduced.
The technical scheme provided by the invention for solving the problems is as follows: a method for reducing the porosity of a particle-reinforced aluminum matrix composite prepared by stirring, the method comprising the following steps,
(1) heating the particle reinforced aluminum matrix composite material prepared by a semi-solid stirring method to a temperature of 30-50 ℃ above the liquidus of the matrix aluminum alloy;
(2) preheating an ultrasonic leading-in rod, then placing the ultrasonic leading-in rod in a melt for high-energy ultrasonic treatment, wherein the ultrasonic leading-in rod is respectively placed at 4 positions of a crucible radius 1/2 and the center of the crucible, and the ultrasonic leading-in rod is respectively adjusted to be at 1/3 and 2/3 height positions away from the bottom of the crucible and equal to 10 positions;
(3) and standing the composite material melt subjected to ultrasonic treatment for 3-5 min, pouring the composite material melt into a preheated mold, simultaneously starting a pulse magnetic field device, and performing pulse magnetic field treatment until the melt is completely solidified to finally obtain the particle-reinforced aluminum-based composite material with low porosity.
Preferably, in the step (1), the particle size of the reinforced particles is 5-50 μm, and the volume fraction of SiC particles is less than 30%.
Preferably, in the ultrasonic treatment process in the step (2), the ultrasonic power is 500-1000W, and the treatment time is 1-3 min.
Preferably, the pulsed magnetic field treatment in the step (3) has the voltage of 100-300V, the frequency of 2-10 Hz and the preheating temperature of the die of 200-400 ℃.
Preferably, the internal porosity of the obtained particle reinforced aluminum matrix composite is less than or equal to 3.0 percent.
Compared with the prior art, the invention has the advantages that:
(1) the PAMCs prepared by stirring are subjected to high-energy ultrasonic treatment, so that air involved in the stirring preparation process can be obviously reduced, and the content of air holes in the composite material is reduced; the pulse magnetic field is used for intervening the solidification process of the composite material, so that the content of shrinkage cavities can be obviously reduced, the porosity of the composite material is greatly reduced, and the mechanical property of PAMCs is improved;
(2) the method has the advantages of low requirement on required equipment, simple process method, easy realization of industrial application and reduction of production cost, and has important significance for popularization and application of PAMCs.
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 not to limit the invention.
FIG. 1 is a diagram of the sonication location of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1
This example describes a reduced agitation preparation of A356-B4The process method for the porosity of the C composite material comprises the following steps:
(1) preparing A356-B by semi-solid stirring casting method43Kg of C composite material, wherein B4The grain diameter of the C particles is 50 μm, and the volume fraction of the C particles is 12%;
(2) A356-B4Heating the composite material melt to 650 ℃, and setting a smelting furnace to be in a heat preservation state;
(3) preheating an ultrasonic guide rod, then placing the ultrasonic guide rod in a melt for high-energy ultrasonic treatment, wherein the ultrasonic guide rod is respectively placed at 4 positions of a crucible radius 1/2 and the center of the crucible, the ultrasonic guide rod is respectively adjusted to be at the positions 1/3 and 2/3 which are away from the bottom of the crucible and have the liquid level height, the ultrasonic guide rod is placed at 10 different positions in total, the ultrasonic power is 600W, and the ultrasonic treatment time at each position is 2min, so that the ultrasonic action effect is ensured;
(4) preheating the mold to 300 ℃, and carrying out ultrasonic treatment on the A356-B4And (3) after standing the C composite material melt for 3min, pouring the C composite material melt into a preheated mold, simultaneously starting a pulse magnetic field device, setting the pulse magnetic field voltage to be 150V and the frequency to be 6Hz, carrying out pulse magnetic field treatment until the melt is completely solidified, finally obtaining a particle reinforced aluminum-based composite material casting, and measuring the porosity of the casting to be 1.68% by adopting an Archimedes drainage method.
Example 2
The process method for reducing the porosity of the 6061-SiC composite material prepared by stirring comprises the following steps:
(1) 4Kg of 6061-SiC composite material is prepared by a semi-solid state stirring casting method, wherein the grain diameter of SiC grains is 50 μm, and the volume fraction of the grains is 10 percent;
(2) heating the 6061-SiC composite material melt to 700 ℃, and arranging a smelting furnace in a heat preservation state;
(3) preheating an ultrasonic guide rod, then placing the ultrasonic guide rod in a melt for high-energy ultrasonic treatment, wherein the ultrasonic guide rod is respectively placed at 4 positions of a crucible radius 1/2 and the center of the crucible, the ultrasonic guide rod is respectively adjusted to be at the positions 1/3 and 2/3 which are away from the bottom of the crucible and have the liquid level height, the ultrasonic guide rod is placed at 10 different positions in total, the ultrasonic power is 800W, and the ultrasonic treatment time at each position is 2min, so that the ultrasonic action effect is ensured;
(4) and (3) the preheated mould is heated to 400 ℃, the ultrasonically treated 6061-SiC composite material melt is kept stand for 5min and poured into the preheated mould, a pulse magnetic field device is started at the same time, the voltage of the pulse magnetic field is set to be 250V, the frequency of the pulse magnetic field is set to be 9Hz, the pulse magnetic field treatment is carried out until the melt is completely solidified, and finally the particle reinforced aluminum matrix composite material casting is obtained, and the porosity of the casting is 1.88 percent measured by adopting an Archimedes drainage method.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (5)
1. A method for reducing the porosity of a particle-reinforced aluminum matrix composite prepared by stirring is characterized by comprising the following steps: the method comprises the following steps of,
(1) heating the particle reinforced aluminum matrix composite material prepared by a semi-solid stirring method to a temperature of 30-50 ℃ above the liquidus of the matrix aluminum alloy;
(2) preheating an ultrasonic leading-in rod, then placing the ultrasonic leading-in rod in a melt for high-energy ultrasonic treatment, wherein the ultrasonic leading-in rod is respectively placed at 4 positions of a crucible radius 1/2 and the center of the crucible, and the ultrasonic leading-in rod is respectively adjusted to be at 1/3 and 2/3 height positions away from the bottom of the crucible and equal to 10 positions;
(3) and standing the composite material melt subjected to ultrasonic treatment for 3-5 min, pouring the composite material melt into a preheated mold, simultaneously starting a pulse magnetic field device, and performing pulse magnetic field treatment until the melt is completely solidified to finally obtain the particle-reinforced aluminum-based composite material with low porosity.
2. The method for reducing the porosity of the particle-reinforced aluminum matrix composite prepared by stirring as claimed in claim 1, wherein: in the step (1), the particle size of the reinforced particles is 5-50 μm, and the volume fraction of SiC particles is less than 30%.
3. The method for reducing the porosity of the particle-reinforced aluminum matrix composite prepared by stirring as claimed in claim 1, wherein: in the ultrasonic treatment process in the step (2), the ultrasonic power is 500-1000W, and the treatment time is 1-3 min.
4. The method for reducing the porosity of the particle-reinforced aluminum matrix composite prepared by stirring as claimed in claim 1, wherein: and (3) performing pulsed magnetic field treatment, wherein the voltage is 100-300V, the frequency is 2-10 Hz, and the preheating temperature of the die is 200-400 ℃.
5. The method for reducing the porosity of the particle-reinforced aluminum matrix composite prepared by stirring as claimed in claim 1, wherein: the internal porosity of the obtained particle reinforced aluminum matrix composite is less than or equal to 3.0 percent.
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| CN202011412471.5A CN112626366A (en) | 2020-12-04 | 2020-12-04 | Method for reducing porosity of particle-reinforced aluminum matrix composite prepared by stirring |
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| CN202011412471.5A CN112626366A (en) | 2020-12-04 | 2020-12-04 | Method for reducing porosity of particle-reinforced aluminum matrix composite prepared by stirring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115058619A (en) * | 2022-07-14 | 2022-09-16 | 河南工程学院 | Nano titanium carbide reinforced 2024 aluminum-based composite material and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121075A (en) * | 2011-02-15 | 2011-07-13 | 江苏大学 | Method for synthesizing particle reinforced aluminum-based composite under high-intensity ultrasonic field and pulsed electric field |
| CN105983682A (en) * | 2015-02-04 | 2016-10-05 | 中国科学院金属研究所 | Method for preparing metal matrix composite under compounding effect of low-pressure pulsed magnet field and ultrasound |
| WO2016184237A1 (en) * | 2015-05-19 | 2016-11-24 | 江苏大学 | 6x82 aluminium-based composite material for use in automobile control arm and preparation method thereof |
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2020
- 2020-12-04 CN CN202011412471.5A patent/CN112626366A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121075A (en) * | 2011-02-15 | 2011-07-13 | 江苏大学 | Method for synthesizing particle reinforced aluminum-based composite under high-intensity ultrasonic field and pulsed electric field |
| CN105983682A (en) * | 2015-02-04 | 2016-10-05 | 中国科学院金属研究所 | Method for preparing metal matrix composite under compounding effect of low-pressure pulsed magnet field and ultrasound |
| WO2016184237A1 (en) * | 2015-05-19 | 2016-11-24 | 江苏大学 | 6x82 aluminium-based composite material for use in automobile control arm and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115058619A (en) * | 2022-07-14 | 2022-09-16 | 河南工程学院 | Nano titanium carbide reinforced 2024 aluminum-based composite material and preparation method thereof |
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Application publication date: 20210409 |