CN117301651A - Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof - Google Patents

Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof Download PDF

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Publication number
CN117301651A
CN117301651A CN202311184429.6A CN202311184429A CN117301651A CN 117301651 A CN117301651 A CN 117301651A CN 202311184429 A CN202311184429 A CN 202311184429A CN 117301651 A CN117301651 A CN 117301651A
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China
Prior art keywords
strength
sheets
light high
treatment
composite board
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CN202311184429.6A
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Chinese (zh)
Inventor
梅青松
谭媛媛
陈子豪
廖凌祎
彭宇琦
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Wuhan University WHU
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Wuhan University WHU
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Priority to CN202311184429.6A priority Critical patent/CN117301651A/en
Publication of CN117301651A publication Critical patent/CN117301651A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention discloses a light high-strength Fe-Al composite board for a finned tube radiator, and a preparation method and application thereof, and belongs to the technical field of layered products composed of metals. The preparation method comprises the following steps: (1) metallic material treatment: preparing an iron sheet and an aluminum sheet, and polishing the two metal sheets to polishing stripes with the same appearance direction; alternately stacking the polished iron sheets and aluminum sheets and keeping the polished stripes in the same direction to obtain a laminated blank; (2) room temperature pre-bonding: rolling the laminated blank to obtain an intermediate material which is preliminarily combined at room temperature; (3) high-temperature diffusion compounding: and carrying out heat preservation treatment on the intermediate material at a certain temperature, immediately taking out the intermediate material after treatment, and carrying out hot rolling to obtain the light high-strength Fe-Al composite board. The sheet metal surface is crushed and mechanically meshed through rolling, the intermetallic compound layer is generated through diffusion reaction in combination with heat preservation, and pores are eliminated to enable interfaces to be combined better, so that the finished product has good tensile property.

Description

Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof
Technical Field
The invention relates to the technical field of layered products composed of metals, in particular to a light high-strength Fe-Al composite plate for a finned tube radiator, and a preparation method and application thereof.
Background
The metal composite plate is characterized in that one layer of metal plate is covered with another metal plate, so that the effects of saving resources and reducing cost are achieved on the premise of not reducing the using effect (corrosion resistance, mechanical strength and the like). In the metal composite plate, based on the consideration of cost and structure light weight, the aims of reducing weight and cost of materials are generally achieved by compounding two or more materials with different properties, the optimal configuration of material resources of each component is realized, and the performance requirement which cannot be met by single metal is realized. The composite plates commonly used in the market at present are titanium/aluminum, titanium/steel, titanium/zinc, copper/aluminum, nickel/titanium and the like.
The Fe-Al composite plate can effectively lighten the weight of the plate by adding the lightweight material Al, and can reduce the cost compared with stainless steel, so that the Fe-Al composite plate has wide application prospect in various civil industries such as construction, automobiles, electric power and the like, and in addition, the Fe-Al composite plate is a key material for producing the bimetal elliptical finned tube of the high-efficiency heat exchanger of the air cooling equipment, but the material is seriously dependent on import in China at present, and the breakthrough of the preparation technology is particularly important. The essence of the preparation of the Fe-Al composite board is the welding and connecting process of iron and aluminum, and relates to the reaction of Fe and Al, and the Fe-Al composite board can be welded by adopting various welding modes, and mainly comprises the following components: fusion welding, brazing, solid phase welding, which achieve Fe and Al joining to some extent, tend to produce large amounts of aggregated intermetallic compounds, and fe—al intermetallic compounds are of a wide variety and are brittle and numerous, the production of which is detrimental to the bonding of the composite panel interface.
Chinese patent CN106319167a discloses a corrosion-resistant rolled aluminum steel composite material and a preparation method thereof, the preparation method comprising: four steps of material preparation, rolling, annealing and heat treatment. Material preparation: preparing an aluminum plate and a steel plate, and polishing the surfaces of the aluminum plate and the steel plate; rolling: rolling and compounding the prepared aluminum plate and steel plate into an aluminum steel composite material by a cold rolling method; annealing: annealing the aluminum steel composite material rolled and compounded in the rolling step to enable the steel to be completely recrystallized; and (3) heat treatment: the rolled aluminum-steel composite material treated in the annealing step is kept at the temperature of 610-620 ℃ for 10-30 min, so that the interface of the aluminum layer and the steel layer is provided with a layer of iron-aluminum intermetallic compound with the thickness of 4-12 mu m. The patent mainly relies on the generation of Fe-Al intermetallic compounds to improve corrosion resistance, so long-time annealing is needed, the generated compound layer is thicker, the aim of forming a thin compound layer to improve bonding strength is not satisfied, and the aim of light weight and high strength is difficult to realize.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, in a first aspect of the present invention, a method for preparing a light high-strength fe—al composite plate with a simple process, suitable for industrial mass production, is provided, comprising the steps of:
(1) And (3) metal material treatment: preparing an iron sheet and an aluminum sheet, and polishing the two metal sheets to polishing stripes with the same appearance direction; alternately stacking the polished iron sheets and aluminum sheets and keeping the polished stripes in the same direction to obtain a laminated blank;
(2) Room temperature pre-bonding: rolling the laminated blank to obtain an intermediate material which is preliminarily combined at room temperature;
(3) High-temperature diffusion compounding: and carrying out heat preservation treatment on the intermediate material at a certain temperature, immediately taking out the intermediate material after treatment, and carrying out hot rolling to obtain the light high-strength Fe-Al composite board.
Preferably, in the step (1), the two metal sheets are polished by using sand paper with 180-400 meshes.
Preferably, in the step (1), both outermost layers of the laminated blank are aluminum sheets.
The aluminum sheet is placed on the outer layer, so that the internal metal is protected from oxidation in the subsequent treatment process, and a protective atmosphere is not needed.
Preferably, in the step (2), the rolling reduction of the laminated blank in the vertical direction is 40 to 50%.
Preferably, in the step (3), the temperature of the heat preservation treatment is 500-650 ℃ and the treatment time is 0.5-2 h.
Preferably, in the step (3), after the intermediate material subjected to heat preservation treatment is hot rolled, the reduction ratio in the vertical direction is 17 to 30%.
Based on the above technology, the design idea of the invention is that after the iron sheet and the aluminum sheet are polished and stacked, the iron sheet and the aluminum sheet are rolled and deformed under the condition of no lubrication at room temperature, and the contact area between dissimilar metals is increased by polishing, so that the combination is promoted (if the polishing is not performed, the mechanical engagement degree between the metal sheets is not ideal, and the design effect is not achieved). In the process of rolling at room temperature, under the huge pressure of a rolling mill, the material is subjected to severe plastic deformation, the sheet metal surface is crushed, and the fresh and unsmooth surface is exposed to be mechanically engaged, so that the iron sheet and the aluminum sheet are primarily combined. In the subsequent high-temperature heat preservation process, a diffusion reaction occurs at the Fe-Al interface to generate a thin Fe-Al intermetallic compound layer which does not influence the interface bonding effect, and the subsequent high-temperature rolling enables the continuous plastic deformation, and meanwhile, the pores left by the generated intermetallic compound layer are eliminated, so that the Fe-Al interface is better bonded. The invention does not need to prepare the material by a liquid solidification method, thereby avoiding various metallographic defects in the solidification process. In addition, the equipment involved in the process is an industrial rolling mill and a muffle furnace, so that industrial large-scale production can be realized.
Because of the hard and brittle nature of the intermetallic compound, the intermetallic compound at the interface becomes a weak phase in the subsequent service process, and the integral mechanical property of the composite board is affected. Thus, in the preparation of composite panels, the formation of intermetallic compounds is generally avoided. The intermetallic compound generated by the process has moderate thickness, does not reduce the interfacial bonding strength and the mechanical property of the material as in the traditional cognition, and the composite plate shows good toughness, firstly, the contribution to the dissimilar intermetallic bonding of iron and aluminum is larger than the adverse effect of the intermetallic bonding of iron and aluminum on the composite plate, and secondly, the intermetallic compound is used as a strengthening phase to strengthen the strength of the composite plate, so that the composite plate has better optimal tensile strength than that calculated by the mixing law of pure iron and pure aluminum.
In a second aspect of the invention, a light high-strength Fe-Al composite board with good interface bonding effect and few metallographic defects is provided, and the light high-strength Fe-Al composite board is prepared by the method of the first aspect of the invention.
In a third aspect of the invention, an application of a light high-strength Fe-Al composite plate is provided, in particular to an application of the composite plate as a metal material in preparing a finned tube radiator.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a preparation method of a light high-strength Fe-Al composite board, which has simple process, does not need to prepare materials by a liquid solidification method, and is suitable for industrial scale production.
The invention provides a light high-strength Fe-Al composite board, which has few metallographic defects and good tensile property.
The invention also provides application of the light high-strength Fe-Al composite plate in preparing a finned tube radiator.
Drawings
FIG. 1 is a photomicrograph of a light weight high strength Fe-Al composite panel of example 1;
FIG. 2 is a photograph of a hardness indentation light of the light high strength Fe-Al composite panel of example 1;
FIG. 3 is a tensile curve of the light high strength Fe-Al composite panel of example 1.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
In the following examples:
iron sheet specification: 5mm by 0.5mm; aluminum sheet specification: 5 mm. Times.5 mm. Times.0.2 mm.
Example 1
The preparation method of the light high-strength Fe-Al composite board comprises the following steps:
(1) And (3) metal material treatment: taking 3 iron sheets and 4 aluminum sheets, removing surface impurities, polishing the surfaces of the two metal sheets by using 180-mesh sand paper in one direction until polishing stripes with the same direction appear, and then cleaning for later use; alternately stacking the polished iron sheets and aluminum sheets according to the stacking sequence of Al-Fe-Al-Fe-Al-Fe-Al, keeping the polishing stripes of sand paper on the surface of the metal sheet in the same direction, and stacking the iron sheets and the aluminum sheets in order to obtain a laminated blank;
(2) Room temperature pre-bonding: wrapping the obtained laminated blank in a steel sheet, rolling and deforming at room temperature, and controlling the rolling reduction rate of the rolled laminated blank in the vertical direction to be 40% to obtain a preliminarily combined intermediate material;
(3) High-temperature diffusion compounding: and (3) placing the obtained intermediate material in a horse boiling furnace at 600 ℃ for heat preservation for 1h, immediately taking out, hot-rolling and thinning, and controlling the reduction ratio in the vertical direction to be 17% to obtain the light high-strength Fe-Al composite board with good interface bonding.
The interlayer morphology of the light high-strength Fe-Al composite plate obtained in this example was observed through an optical lens (model: carl Zeiss Axio Lab. A1; magnification: 200 times). As can be seen from fig. 1, the bonding mode of the composite board is two modes of mechanical engagement and diffusion bonding, the Fe layer and the Al layer are tightly bonded, and a thin intermetallic compound layer (IMCs) exists between the Fe layer and the Al layer, so that the bonding strength between the boards is improved. Compared with the laminated blank subjected to polishing treatment in the embodiment, if the iron sheet and the aluminum sheet are directly rolled without polishing treatment, the metal sheets are difficult to realize room-temperature pre-bonding without mechanical engagement, namely gaps exist due to the fact that the metal sheets are not bonded, oxides are generated on the surfaces of Fe and Al in the subsequent heat preservation process, and the effect of tightly bonding the Fe layer and the Al layer is not achieved.
The light high-strength Fe-Al composite plate obtained in this example was tested by using a microhardness tester (model: michael-H200; load: 500g; holding time: 10 s). FIG. 2 shows that the Fe-Al interface bonds well, even at a pressure of 500g, the interface sites did not crack, indicating that the interface bonding was good; the indentation morphology is clear, the indentation difference between the Fe area and the Al area is not large, and the coordinated deformation result is reflected
4 standard tensile test pieces of the light high-strength Fe-Al composite board of the present example were prepared, and tensile properties thereof were tested by using an electronic universal tester (model: MTS E45.105; displacement speed: 0.5 mm/s). As shown in FIG. 3, the tensile strength of the composite board is 520-570 MPa, the elongation is 8.0% -9.2%, and the composite board shows good tensile property.
Example 2
The preparation method of the light high-strength Fe-Al composite board comprises the following steps:
(1) And (3) metal material treatment: taking 2 iron sheets and 3 aluminum sheets, removing surface impurities, polishing the surfaces of the two metal sheets by using 320-mesh sand paper in one direction until polishing stripes with the same direction appear, and then cleaning for later use; alternately stacking the polished iron sheets and aluminum sheets according to the stacking sequence of Al-Fe-Al-Fe-Al, keeping the polishing stripes of sand paper on the surface of the metal sheets in the same direction, and stacking the iron sheets and the aluminum sheets in order to obtain a laminated blank;
(2) Room temperature pre-bonding: wrapping the obtained laminated blank in a steel sheet, rolling and deforming at room temperature, and controlling the rolling reduction rate of the rolled laminated blank in the vertical direction to be 50% to obtain a preliminarily combined intermediate material;
(3) High-temperature diffusion compounding: and (3) placing the obtained intermediate material in a horse boiling furnace at 500 ℃ for heat preservation for 2 hours, immediately taking out, hot-rolling and thinning, and controlling the reduction ratio in the vertical direction to be 20 percent to obtain the light high-strength Fe-Al composite board with good interface bonding.
Example 3
The preparation method of the light high-strength Fe-Al composite board comprises the following steps:
(1) And (3) metal material treatment: taking 4 iron sheets and 5 aluminum sheets, removing surface impurities, polishing the surfaces of the two metal sheets by 400-mesh sand paper in one direction until polishing stripes with the same direction appear, and then cleaning for later use; alternately stacking the polished iron sheets and aluminum sheets according to the stacking sequence of Al-Fe-Al-Fe-Al, keeping the polishing stripes of sand paper on the surface of the metal sheets in the same direction, and stacking the iron sheets and the aluminum sheets in order to obtain a laminated blank;
(2) Room temperature pre-bonding: wrapping the obtained laminated blank in a steel sheet, rolling and deforming at room temperature, and controlling the rolling reduction rate of the rolled laminated blank in the vertical direction to be 40% to obtain a preliminarily combined intermediate material;
(3) High-temperature diffusion compounding: and (3) placing the obtained intermediate material in a horse boiling furnace at 650 ℃ for heat preservation for 0.5h, immediately taking out the intermediate material for hot rolling and thinning, and controlling the rolling reduction in the vertical direction to be 30%, thus obtaining the light high-strength Fe-Al composite board with good interface bonding.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (8)

1. The preparation method of the light high-strength Fe-Al composite board is characterized by comprising the following steps of:
(1) And (3) metal material treatment: preparing an iron sheet and an aluminum sheet, and polishing the two metal sheets to polishing stripes with the same appearance direction; alternately stacking the polished iron sheets and aluminum sheets and keeping the polished stripes in the same direction to obtain a laminated blank;
(2) Room temperature pre-bonding: rolling the laminated blank to obtain an intermediate material which is preliminarily combined at room temperature;
(3) High-temperature diffusion compounding: and carrying out heat preservation treatment on the intermediate material at a certain temperature, immediately taking out the intermediate material after treatment, and carrying out hot rolling to obtain the light high-strength Fe-Al composite board.
2. The method according to claim 1, characterized in that: in the step (1), two metal sheets are polished by adopting abrasive paper with 180-400 meshes.
3. The method according to claim 1, characterized in that: in the step (1), the outermost layers at two sides of the laminated blank are aluminum sheets.
4. The method according to claim 1, characterized in that: in the step (2), the rolling reduction rate of the laminated blank in the vertical direction is 40-50%.
5. The method according to claim 1, characterized in that: in the step (3), the temperature of the heat preservation treatment is 500-650 ℃ and the treatment time is 0.5-2 h.
6. The method according to claim 1, characterized in that: in the step (3), after the intermediate material subjected to heat preservation treatment is subjected to hot rolling, the reduction rate in the vertical direction is 17-30%.
7. A light high-strength Fe-Al composite board is characterized in that: the method according to any one of claims 1 to 6.
8. The use of the light high-strength Fe-Al composite panel according to claim 7, wherein: the metal material is used as a metal material in the preparation of the finned tube radiator.
CN202311184429.6A 2023-09-12 2023-09-12 Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof Pending CN117301651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311184429.6A CN117301651A (en) 2023-09-12 2023-09-12 Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311184429.6A CN117301651A (en) 2023-09-12 2023-09-12 Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN117301651A true CN117301651A (en) 2023-12-29

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Application Number Title Priority Date Filing Date
CN202311184429.6A Pending CN117301651A (en) 2023-09-12 2023-09-12 Light high-strength Fe-Al composite board for finned tube radiator and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN117301651A (en)

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