CN113978055B - Aluminum-based layered composite material and preparation method and application thereof - Google Patents

Aluminum-based layered composite material and preparation method and application thereof Download PDF

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Publication number
CN113978055B
CN113978055B CN202111194040.0A CN202111194040A CN113978055B CN 113978055 B CN113978055 B CN 113978055B CN 202111194040 A CN202111194040 A CN 202111194040A CN 113978055 B CN113978055 B CN 113978055B
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aluminum
thickness
rolling
composite material
layered composite
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CN113978055A (en
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彭聪
彭卓玮
袁泽军
欧阳维杰
禹金科
蒋小晶
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Changsha Zhongxing New Material Technology Co ltd
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Changsha Zhongxing New Material Technology Co ltd
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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
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of 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
    • 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
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • 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
    • 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
    • B32B38/0036—Heat treatment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0011—Working of insulating substrates or insulating layers
    • H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
    • H05K3/0047—Drilling of holes
    • 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
    • B32B38/0036—Heat treatment
    • B32B2038/0048—Annealing, relaxing
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/08—PCBs, i.e. printed circuit boards

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses an aluminum-based layered composite material and a preparation method and application thereof. An aluminum-based layered composite material comprises an aluminum sheet layer and a lubrication layer arranged on the aluminum sheet layer; the thickness of the lubricating layer is 10-25% of the thickness of the aluminum sheet layer; the raw material of the lubricating layer is aluminum alloy, and the tensile strength is 80-100 MPa; the tensile strength of the raw materials of the aluminum sheet layer is 110-140 MPa. According to the aluminum-based layered composite material, the aluminum sheet layer, the lubricating layer and the lubricating layer are matched in hardness and thickness, so that the lubricating layer can replace a traditional resin film on the premise of ensuring drilling precision; therefore, when the aluminum-based layered composite material is used as a lubricating aluminum plate, the heat dissipation capacity can be improved, the subsequent flow and cost can be saved, and the aluminum-based layered composite material is more environment-friendly.

Description

Aluminum-based layered composite material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of printed circuit boards, and particularly relates to an aluminum-based layered composite material and a preparation method and application thereof.
Background
An aluminum sheet for a printed circuit board (printed circuit board, PCB) refers to an aluminum sheet which is covered on the surface of a PCB board (to-be-processed production board) during drilling, and is also called a lubricating aluminum sheet, a coating aluminum sheet or a film-coated aluminum sheet, in order to improve the drilling accuracy of the PCB. The lubricating aluminum sheet has a buffering function, so that the generation of pressure feet can be avoided, and the positioning accuracy of the drill bit is improved; the heat dissipation performance is excellent, so that the service life of the drill bit can be prolonged, and the breakage rate of drilling holes can be reduced; the hole wall roughness can be improved, the drilling quality is improved, and the productivity efficiency is improved due to the excellent heat dissipation performance.
The most traditional aluminum lubrication sheet is a pure aluminum alloy, and with the development of high densification of the PCB and the continuous improvement of the reliability requirement, the common pure aluminum alloy can not meet the requirements of the high-precision sharp PCB products on the aluminum lubrication sheet during drilling due to the characteristics of the common pure aluminum alloy on the structural performance.
In the related art, in order to improve the drilling precision of the PCB, a layer of relatively soft resin film is coated on the surface of the aluminum alloy to form a lubricating aluminum sheet, and the resin film has good water solubility and can be used for removing resin residues by water after the use is finished. The film-coated lubricating aluminum sheet can improve the hole position precision of PCB drilling and reduce the hole position roughness, and is widely applied to PCB drilling of high-precision Ball grid array (Ball GRID ARRAY, BGA) structure, drilling of smaller hole diameter and the like.
However, in order to increase the adhesive force, the aluminum sheet needs to be cleaned before the resin is coated, and resin residues need to be removed by washing after the drilling process is finished, which is equivalent to adding at least two processes, and the flow, time and cost are not saved; in addition, the liquid for cleaning the aluminum sheet and the resin requires post-treatment, otherwise it may pollute the environment.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the aluminum-based layered composite material provided by the invention has the advantages that the hardness and the thickness of the aluminum sheet layer and the lubricating layer are matched, so that the lubricating layer can replace the traditional resin film on the premise of ensuring the drilling precision; therefore, when the aluminum-based layered composite material is used as a lubricating aluminum plate, the heat dissipation capacity can be improved, the subsequent flow and cost can be saved, and the aluminum-based layered composite material is more environment-friendly.
The invention also provides a preparation method of the aluminum-based layered composite material.
The invention also provides application of the aluminum-based layered composite material in preparation of a printed circuit board.
According to one aspect of the present invention, an aluminum-based layered composite material is provided, comprising an aluminum sheet layer and a lubricating layer provided on the surface thereof;
the thickness of the lubricating layer is 10-25% of the thickness of the aluminum sheet layer;
the lubricating layer is made of aluminum alloy, and the tensile strength is 80-100 MPa;
The tensile strength of the aluminum sheet layer is 110-140 MPa.
According to a preferred embodiment of the invention, there is at least the following advantageous effect:
(1) Because the drill bit is hard, if a hard aluminum sheet layer is directly drilled, sliding can be generated, the drilling precision is affected, and larger heat is generated;
In the invention, the tensile strength of the raw material of the lubricating layer is only 80-100 MPa, and the lubricating layer belongs to the aluminum alloy with very low hardness, so that the lubricating layer can replace a resin film in the traditional lubricating aluminum plate to be used as the lubricating layer, and the positioning precision of a drill bit is not influenced;
In addition, the hardness of the lubricating layer and the aluminum sheet layer is matched from soft to hard, so that a good buffering effect can be achieved during drilling.
(2) In the invention, because the raw material of the lubricating layer is aluminum alloy, compared with the traditional resin film, the aluminum-based layered composite material has good thermal conductivity, when being used for assisting the drilling of the printed circuit board, the aluminum-based layered composite material has improved heat dissipation performance, thereby prolonging the service life of a drill bit, reducing the breakage rate (the probability of breaking the drill bit) and improving the drilling quality and efficiency.
(3) Because the lubricating layer is made of aluminum alloy, the invention has no influence on the subsequent process of the printed circuit board, and therefore, the operation of removing resin by subsequent cleaning is not needed, and the flow and the cost are saved; and the waste water brought by cleaning does not need to be treated, so that the environmental protection is improved.
(4) In addition, the thickness ratio of the traditional lubricating aluminum sheet is 10-25%, and the aluminum-based layered composite material is more convenient to popularize and apply because the thickness ratio is used for assisting the drilling of the printed circuit board when the aluminum-based layered composite material is used for assisting the drilling of the printed circuit board.
In some preferred embodiments of the invention, the lubricating layer thickness is 10 to 20% of the aluminum sheet layer thickness.
In some embodiments of the invention, the aluminum sheet layer has a thickness of 145 to 155 μm.
In some preferred embodiments of the invention, the aluminum sheet layer has a thickness of about 145 to 155 μm.
In some embodiments of the invention, the lubricating layer has a thickness of 25 to 35 μm.
In some preferred embodiments of the invention, the thickness of the lubricating layer is about 30 μm.
In some embodiments of the invention, the feedstock for the lubricating layer comprises a 1060 type aluminum alloy.
In some embodiments of the invention, the lubricant layer is a fully annealed 1060-type aluminum alloy.
In some embodiments of the invention, the starting material for the aluminum sheet layer comprises a 3003 type aluminum alloy.
In some embodiments of the invention, the starting material for the aluminum sheet layer is a fully annealed 3003 type aluminum alloy.
The complete annealing is also called recrystallization annealing, and refers to a process of annealing at a temperature 10-20 ℃ higher than the phase transition temperature and then slowly cooling.
The soft state (after complete annealing) tensile strength of the pure copper is 220-270 MPa, and the tensile strength of the pure iron is 170-270 MPa; the tensile strength of the aluminum sheet layer is obviously higher than that of the aluminum sheet layer, namely the hardness is obviously higher than that of the aluminum sheet layer; therefore, the aluminum sheet layer or the lubricating layer cannot be replaced by the aluminum sheet layer or the lubricating layer.
Further, regarding the heat conduction coefficient: copper 381W/(mK) and aluminum 218W/(mK) are far greater than iron 80W/(mK), so copper and aluminum are good heat dissipation materials; however, the price of copper meeting the drilling precision is about 7 ten thousand yuan/ton, the price of aluminum is about 2 ten thousand yuan/ton, namely, the price of aluminum is about 1/3.5 of the price of copper, so the invention also obviously saves the cost by adopting the aluminum-based raw material.
According to still another aspect of the present invention, there is provided a method for preparing the aluminum-based layered composite material, comprising compounding and heating the raw materials of the lubricating layer and the aluminum sheet layer, and then roll-forming.
The preparation method according to a preferred embodiment of the present invention has at least the following advantageous effects:
The composite board is mature in the preparation industry, so that the preparation method provided by the invention has good compatibility with the traditional process, does not need to add new equipment, and saves the cost.
In some embodiments of the invention, the contact surface between the raw material of the aluminum sheet layer and the raw material of the lubricating layer is polished in the compounding.
In some embodiments of the invention, the temperature of the heating is 530 to 550 ℃.
In some embodiments of the invention, the heating is for a period of 13 to 17 hours.
In some embodiments of the invention, the heating is for a period of about 15 hours.
In some embodiments of the invention, the roll forming pressure is 100 to 1000t.
In some embodiments of the invention, the roll forming comprises hot rolling, cold rough rolling and cold finish rolling, which proceed sequentially. In some embodiments of the invention, the first pass reduction of the hot rolling is 4mm±0.5mm.
In some embodiments of the invention, the first pass reduction of the hot rolling is about 4mm.
In some embodiments of the invention, the hot rolling has a first pass rolling force of 220 to 250t.
In some embodiments of the invention, the hot rolling force is 100 to 1000t, except for the first pass.
The other hot rolling treatments except the first pass can lead to metallurgical bonding between the aluminum sheet layer raw material and the lubricating layer raw material.
In some embodiments of the invention, the thickness of the resulting first intermediate plate after hot rolling is 7.0mm±0.5mm.
In some embodiments of the invention, the thickness of the resulting first intermediate plate after hot rolling is about 7.0mm.
In some embodiments of the invention, the first intermediate plate has a width of 1200 to 1350mm.
In some embodiments of the invention, the first intermediate plate has a width of about 1350mm.
In some embodiments of the invention, the thickness of the second intermediate plate obtained after cold rough rolling is from 0.36 to 0.39mm.
In some embodiments of the invention, the thickness of the second intermediate plate obtained after cold rough rolling is about 0.37mm.
In some embodiments of the invention, the cold rough rolling comprises a first cold rough rolling, trimming, a first annealing, and a second cold rough rolling performed in sequence.
In some embodiments of the invention, the first cold rough rolling comprises four passes, the first pass resulting in a second intermediate plate a having a thickness of about 4.5±0.1mm; the thickness of the second intermediate plate B obtained in the second pass is about 2.7+/-0.1 mm; the thickness of the second intermediate plate C obtained in the third pass is about 1.6+/-0.1 mm; the thickness of the second intermediate plate D obtained in the fourth pass was about 1.0±0.1mm.
In some embodiments of the invention, the trimming comprises cutting the resulting second intermediate panel D to a width of about 1270±5mm. In some embodiments of the invention, the temperature of the primary anneal is about 360 ℃ for about 2 hours.
The primary annealing serves to eliminate work hardening generated during the first cold rough rolling.
In some embodiments of the invention, the second cold rough rolling includes first rolling the thickness of the second intermediate plate D to about 0.58±0.1mm and then rolling to the desired thickness of the second intermediate plate.
In some embodiments of the invention, the thickness of the resulting aluminum-based layered composite material after cold finish rolling is from 0.17 to 0.20mm.
In some preferred embodiments of the present invention, the thickness of the resulting aluminum-based layered composite material after cold finish rolling is about 0.18mm.
In some embodiments of the invention, the finish cold rolling comprises a first finish cold rolling, a second annealing, and a second finish cold rolling.
In some embodiments of the invention, the first finish cold rolling comprises rolling the second intermediate plate to a thickness of about 0.265mm.
In some embodiments of the invention, the second anneal is at a temperature of about 380 ℃ for a period of about 2 hours.
The second annealing is performed to soften the intermediate plate obtained by the first finish cold rolling sufficiently to obtain the target strength.
In some embodiments of the invention, the second finish cold rolling comprises rolling the sheet obtained from the first finish cold rolling to a desired thickness of the aluminum-based layered composite material.
In some embodiments of the invention, the final pass reduction ratio of the second finish cold rolling is 30 to 35%.
In some embodiments of the invention, the final pass reduction ratio of the second finish cold rolling is about 32%.
The machining rate is psi= (S 0-S)/S0; wherein S represents the thickness before machining and S represents the thickness after machining.
In some embodiments of the invention, the method of making further comprises surface treating the raw materials of the lubricating layer and aluminum sheet layer prior to the compounding.
In some embodiments of the invention, the surface treatment is a face milling.
If the thickness ratio of the raw materials of the lubricating layer and the aluminum sheet layer does not meet the requirement, hot rolling of the raw materials of the lubricating layer and the aluminum sheet layer can be performed after the surface treatment so as to adjust the thickness ratio.
In some embodiments of the present invention, the method further comprises annealing, straightening and slitting sequentially after the roll forming.
In some embodiments of the invention, the annealing temperature is 370-390 ℃.
In some embodiments of the invention, the annealing temperature is about 380 ℃.
In some embodiments of the invention, the length of the anneal is 1.5 to 2 hours.
In some embodiments of the invention, the length of the anneal is about 2 hours. In some embodiments of the invention, the tension leveler and the lubricant layer side surface employ a passive texturing roller.
In some embodiments of the invention, the passive texturing roller has a roughness of 3.0 to 4.0um.
The passive texturing roller with certain roughness is used for improving the roughness of one side surface of the lubricating layer so as to improve the friction force between the drill bit and the lubricating layer and further improve the drilling precision.
In some embodiments of the invention, the width of the resulting aluminum-based layered composite material is about 1245±1mm.
In some embodiments of the present invention, after the slitting, the aluminum-based layered composite material further comprises a package, wherein the package is obtained by winding the aluminum-based layered composite material with a paper core, and packaging the aluminum-based layered composite material; the weight of each roll of aluminum-based layered composite material is 3-3.5T.
According to a further aspect of the invention, there is provided the use of said aluminium-based layered composite material for the preparation of printed circuit boards.
The use according to a preferred embodiment of the invention has at least the following advantages:
the aluminum-based layered composite material provided by the invention can be used as a lubricating aluminum plate, and the lubricating layer can replace the traditional resin film on the premise of ensuring the drilling precision by matching the hardness and the thickness of the aluminum sheet layer and the lubricating layer; therefore, when the aluminum plate lubricating device is applied to lubricating aluminum plates, the heat dissipation capacity is improved, the follow-up flow and cost are saved, and the aluminum plate lubricating device is more environment-friendly.
Unless otherwise indicated, the term "about" in the present invention means that the error range is.+ -. 2%; for example, "about 100" means "100±100×2%", i.e., 100±2.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a microscopic golden phase diagram of a cross section of an intermediate plate obtained after cold rough rolling in example 1 of the present invention;
FIG. 2 is a schematic representation of one side of an aluminum sheet layer of the aluminum-based layered composite material obtained after cold finish rolling in example 1 of the present invention;
FIG. 3 is a physical diagram of one side of the lubricant layer of the aluminum-based layered composite material obtained after cold finish rolling in example 1 of the present invention;
FIG. 4 is a pictorial view of one side surface of a commercial aluminum lubricant sheet resin coating;
FIG. 5 is a schematic diagram of drilling accuracy with 3003 aluminum alloy as the lubricant aluminum layer;
Fig. 6 is a schematic view of drilling accuracy of an aluminum-based layered composite material obtained in example 1 as a lubricant aluminum layer.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Example 1
This example produces an aluminum-based layered composite material, as shown in table 1, wherein the dimensions of the material are expressed as thickness x width x length, for example aluminum sheet layer raw material 3003: 350.1350.5500 mm, which means that the raw material is 3003 aluminum alloy, the thickness is 350mm, the width is 1350mm, and the length is 5500mm;
The letter C indicates that any length is satisfactory.
TABLE 1 preparation Process of aluminum-based composite layered composite Material obtained in example 1
Test examples
This test example tests the intermediate product properties and the end product properties of the aluminum-based layered composites prepared in the examples. Wherein:
The section microscopic metallographic phase of the intermediate plate obtained after cold rough rolling is shown in figure 1; the overall thickness of the intermediate plate is shown to be about 0.372mm; the thickness of the lubricating layer is 0.057-0.060 mm, and the uniformity is good.
The physical diagram of the intermediate plate after cold finish rolling is shown in figures 2-3; the figure shows that the evenness and uniformity of the two materials are good.
In a commercial aluminum lubrication plate with a resin coating (0.18 mm thickness specification aluminum lubrication plate manufactured by Dongguan electronic technology Co., ltd., guangdong province), a physical diagram of one side of the resin coating is shown in FIG. 4, the roughness of the aluminum lubrication layer of the middle plate in FIG. 4 is Ra2.5-3.5 μm, and the roughness of the aluminum lubrication layer of the middle plate in FIG. 3 is 0.2-0.6 μm, which indicates that the aluminum-based layered composite material provided by the invention has the same effect as the commercial aluminum lubrication plate, and only needs polishing to improve the roughness; the subsequent tension leveler process of the invention can just raise the roughness of the lubricating layer to about 3.0 mu m;
The roughness test method is to detect the roughness on the surface of a material by a contact (stylus) type instrument.
This test example also tested the drilling accuracy of aluminum-based layered composite material obtained in example 1 as a lubricated aluminum sheet, and of a commercial lubricated aluminum sheet coated with resin of equal thickness, wherein the drilling conditions were: a Hitachi HITACHI ND-6L drill bit with a diameter of 0.25mm, a rotation speed of 200krpm, a drilling number of 60000, a corrected line width (guide line) of 80 μm and a maximum number of consecutive shots (max hit) of 2000 was used.
The test results of drilling accuracy are shown in fig. 5-6; wherein fig. 5 is a schematic diagram of drilling accuracy with a commercial aluminum lubricant sheet coated with resin, and a process capability index CPK value of 3.0; FIG. 6 is a graph showing the drilling accuracy of aluminum-based layered composite materials obtained in the examples as a lubricated aluminum sheet, showing a process capability index CPK value of 3.5; the aluminum-based layered composite material provided by the invention can obviously improve the drilling precision.
The tensile strength of the aluminum-based layered composite material obtained in the example 1 is also tested in the test example, and the test result shows that the tensile strength of the aluminum-based layered composite material obtained in the example 1 is 140-170 MPa (the length of the aluminum-based layered composite material in the same roll can reach thousands of meters, and the numerical range corresponds to the statistical value of the tensile strengths at different positions).
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (4)

1. An aluminum-based layered composite material is characterized by comprising an aluminum sheet layer and a lubricating layer arranged on the surface of the aluminum sheet layer;
the thickness of the aluminum-based layered composite material is 0.18mm;
The thickness of the lubricating layer is 10-25% of the thickness of the aluminum sheet layer;
the lubricating layer is made of 1060-type aluminum alloy with the thickness of 350mm and being completely annealed, and the tensile strength is 80-100 MPa;
The aluminum sheet layer is made of 3003 type aluminum alloy with the thickness of 350mm and being completely annealed; the tensile strength is 110-140 MPa; the preparation method of the aluminum-based layered composite material comprises the following steps in sequence:
Milling surfaces of raw materials of the lubricating layer and the aluminum sheet layer, and performing skin hot rolling on the raw materials of the lubricating layer;
Compounding the raw materials of the obtained aluminum sheet layer and the raw materials of the lubricating layer, heating, rolling, forming, annealing, straightening, and cutting;
In the milling, the thickness of a single-sided milling surface of the raw material of the lubricating layer is 10mm, and the thickness of a single-sided milling surface of the raw material of the aluminum sheet layer is 20mm;
After the skin material is hot rolled, the thickness of the raw material of the lubricating layer is 80mm;
the heating temperature is 540 ℃ and the duration is 15 hours;
the roll forming comprises hot rolling, cold rough rolling and cold finish rolling which are sequentially carried out, wherein,
The reduction of the first pass of the hot rolling is 4mm, the rolling force of the first pass is 230t, the rolling force of the other passes is 800t, the thickness of the first intermediate plate obtained by the hot rolling is 7.0mm, and the width of the first intermediate plate is 1350mm;
The cold rough rolling comprises a first cold rough rolling, trimming, primary annealing and a second cold rough rolling which are sequentially carried out; the first cold rough rolling comprises four passes, and the thickness of the second intermediate plate A obtained in the first pass is 4.5mm; the thickness of the second intermediate plate B obtained in the second pass is 2.7mm; the thickness of the second intermediate plate C obtained in the third pass is 1.6mm; the thickness of the second intermediate plate D obtained in the fourth pass is 1.0mm; the temperature of the primary annealing is 360 ℃ and the time is 2 hours; the second cold rough rolling includes rolling the thickness of the second intermediate plate D to 0.58mm and then to 0.372mm;
the cold finish rolling comprises a first cold finish rolling, a second annealing and a second cold finish rolling; the thickness of the intermediate plate obtained by the first cold finish rolling is 0.265mm; the temperature of the second annealing is 380 ℃ and the time is 2h; the final pass processing rate of the second finish cold rolling is 32%;
The annealing temperature is 380 ℃ and the duration is 2 hours.
2. The aluminum-based layered composite material according to claim 1, wherein the aluminum sheet layer has a thickness of 145-155 μm.
3. The aluminum-based layered composite material according to claim 1, wherein the thickness of the lubricating layer is 25-35 μm.
4. Use of the aluminum-based layered composite material according to any one of claims 1 to 3 for the preparation of printed circuit boards.
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