High-strength multilayer composite packaging material and preparation method thereof

Abstract

The invention relates to the technical field of electronic packaging materials, and particularly discloses a high-strength multilayer composite packaging material and a preparation method thereof. The invention relates to a high-strength multilayer composite packaging material which is obtained by compounding 9.5-16.5 parts of silver-copper-tin alloy layer, 9.5-16.5 parts of copper layer, 9.5-16.5 parts of 4J29 alloy layer and 9.5-16.5 parts of nickel layer in sequence. 27.5 to 28.5 parts of a copper layer; 47 to 61 parts of a 4J29 alloy layer; and 2-8 parts of a nickel layer. The preparation method comprises the steps that 4J29 alloy is subjected to nickel compounding in a soft state, copper and silver-copper-tin alloy hot rolling compounding is conducted on a pre-compounded strip, diffusion annealing and surface acid pickling treatment are conducted, then cold rolling treatment is conducted, and a blank strip is obtained; and the blank strip is subjected to intermediate heat treatment, surface acid pickling treatment and finish rolling treatment, and then the operation in the step is repeated. The high-strength multi-layer composite packaging material can protect the crystal oscillator from being damaged easily under the condition of impact or vibration, and can maintain better application stability when bearing a stress accumulation effect caused by temperature difference.

Description

Technical Field

[0001] The present application relates to the technical field of electronic packaging materials, and more specifically, to a high-strength multi-layer composite packaging material and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of information technology, the integration and complexity of electronic devices have continued to increase, and the demand for electronic components has also continued to grow. Crystal oscillators, as the "heart" of electronic devices, primarily provide stable clock signals and are widely used in various electronic devices such as computers, communications equipment, and instrumentation. Consequently, the requirements for their performance are becoming increasingly stringent, as their stability and accuracy directly impact the operation of the entire electronic system.

[0003] As a crucial component of a crystal oscillator, packaging materials effectively isolate the crystal chip from the external environment, preventing dust, moisture, vibration, and other factors from affecting its performance. This improves the crystal's environmental and vibration resistance, reduces performance fluctuations caused by environmental changes, protects the crystal chip from external damage, and extends its service life, thereby ensuring the oscillator's stability and reliability in complex operating environments. Existing technologies often use metal, plastic, ceramic, and glass packaging. Metal packaging offers excellent shielding and heat dissipation, making it suitable for applications with high interference and temperature requirements. Plastic packaging is low-cost and simple to manufacture, making it widely used in electronic products. Ceramic packaging offers excellent high-temperature and corrosion resistance, making it suitable for applications in extreme environments. Glass packaging offers excellent sealing and mechanical strength, making it suitable for high-precision, high-stability crystal oscillator packaging.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the above-mentioned packaging materials are difficult to ensure the long-term stable operation of the crystal oscillator under extreme environments. For example, the stress accumulation effect caused by temperature difference will limit the operating temperature range of the crystal oscillator and also increase the production cost; the mechanical properties of the packaging material itself are poor, which makes the crystal oscillator easily damaged when it is hit or vibrated, shortening its service life and further restricting its development.

[0005] Therefore, there is an urgent need to propose a solution to solve the above technical problems. Summary of the Invention

[0006] In order to improve the strength of the packaging material and its application stability in a temperature-varying environment, thereby ensuring the stable operation of the crystal oscillator, the present application provides a high-strength multi-layer composite packaging material and a preparation method thereof.

[0007] In a first aspect, the present application provides a high-strength multi-layer composite packaging material, which adopts the following technical solution: A high-strength multi-layer composite packaging material is obtained by sequentially compounding a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer, wherein the respective weight portions of the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer, and the nickel layer are as follows: 9.5-16.5 parts of silver-copper-tin alloy layer; Copper layer 27.5-28.5 parts; 4J29 alloy layer 47-61 parts; 2-8 layers of nickel.

[0008] By adopting the above technical solution, the silver-copper-tin alloy layer is a metal alloy composed of tin (Sn), silver (Ag) and copper (Cu). This alloy not only inherits the advantages of a single metal component, such as the low melting point and excellent soldering performance of tin, the high conductivity and oxidation resistance of silver, and the high strength and good thermal stability of copper, but also reduces the bonding damage caused by thermal stress through the synergistic effect between the elements; the copper layer has good thermal conductivity and can effectively transfer heat from the semiconductor module, improving the heat dissipation performance, and can also provide mechanical support for the crystal oscillator and enhance its structural stability; the 4J29 alloy has a maximum hardness of approximately 150 HV. When it is combined with the silver-copper-tin alloy layer, the copper layer and the nickel layer, the hardness of the composite packaging material (≥ 300 HV), strength and toughness are significantly improved, and it exhibits good wear resistance and corrosion resistance. The excellent thermal expansion coefficient matching, stable physical and chemical properties, and good low-temperature structural stability of the 4J29 alloy itself can also ensure that the composite packaging material can better cope with the stress accumulation effect caused by temperature differences. The nickel layer has good conductivity, which can significantly improve the conductivity of the packaging material, ensure stable current transmission, reduce signal loss, and effectively isolate air and moisture, preventing oxidation and corrosion of the substrate, and extending the service life of the composite packaging material. A high-strength multi-layer composite packaging material is obtained by combining silver-copper-tin alloy layers, copper layers, 4J29 alloy layers, and nickel layers. Its high inherent strength can protect the crystal oscillator from damage in the event of impact or vibration, and can maintain excellent application stability when subjected to the stress accumulation effect caused by temperature differences.

[0009] Preferably, the silver-copper-tin alloy layer comprises the following components in parts by weight: 66.5-67.5 parts of silver; Copper 28.5-29.5 parts; 3-5 parts of tin.

[0010] By adopting the above technical solution, the silver-copper-tin alloy layer obtained by mixing silver, copper and tin in the above-mentioned dosage ratio has a better synergistic effect between the elements, exhibits relatively excellent ductility when used, and can form a uniform and stable composite structure with the copper layer, 4J29 alloy layer and nickel layer, thereby being able to exert a better corresponding effect, and finally obtaining a high-quality high-strength multi-layer composite packaging material.

[0011] Preferably, the 4J29 alloy layer comprises the following components in parts by weight: Nickel 28.5-29.5 parts; Cobalt 16.5-17.5 parts; 53-55 parts of iron.

[0012] By adopting the above technical solution, the 4J29 alloy layer obtained by mixing nickel, cobalt and iron in the above-mentioned dosage ratio performs better in its own thermal expansion coefficient matching, stable physical and chemical properties and good low-temperature structural stability, and after being compounded with the silver-copper-tin alloy layer, copper layer and nickel layer, a high-strength multi-layer composite packaging material with better application quality can be obtained.

[0013] In a second aspect, the present application provides a method for preparing a high-strength multi-layer composite packaging material, which adopts the following technical solution: A method for preparing a high-strength multi-layer composite packaging material comprises the following steps: (1) preparing raw materials including a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer according to a ratio; (2) 4J29 alloy is clad with nickel in a soft state to obtain a pre-clad strip; (3) hot-rolling and laminating the pre-clad strip in step (2) with copper and silver-copper-tin alloy using a two-roll double-roll hot-clad rolling mill to obtain a composite material consisting of a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer in order from top to bottom; (4) performing diffusion annealing on the composite material obtained in step (3), performing surface pickling treatment after diffusion annealing, and performing cold rolling treatment after surface pickling treatment to obtain a blank strip; (5) The embryonic strip in step (4) is subjected to intermediate heat treatment, and then subjected to surface pickling treatment after the intermediate heat treatment, and then subjected to finish rolling treatment after the surface pickling treatment, and then the above-mentioned operation of this step is repeated until a finished strip of the required specifications is obtained, that is, a high-strength multi-layer composite packaging material.

[0014] By adopting the above technical solution, in the above operations, the setting of each processing sequence and the coordination between them are not easy to carry out quality control during the process, ensuring the stability and precision of the processing process, and also making it possible to form a relatively stable bond between the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer and the nickel layer, thereby obtaining a high-quality high-strength multi-layer composite packaging material, and the entire preparation method is also relatively efficient, and has a better application effect in large-scale industrial production.

[0015] Preferably, in step (2), the compounding temperature is 800-850° C., and the compounding speed is 1-3 m / min.

[0016] By adopting the above-mentioned technical solution, temperature control is crucial during the composite process. Temperature not only affects the physical and chemical properties of the composite material, but is also directly related to the final quality and service life of the product. The selection of the above-mentioned composite temperature and composite speed enables an excellent and stable bond to be formed between the 4J29 alloy layer and the nickel layer, which is less likely to cause flow marks and bubbles in the product, thereby helping to ensure the excellent quality of the final high-strength multi-layer composite packaging material.

[0017] Preferably, in step (3), the temperature of hot rolling composite is 660-700°C, the annealing speed is 1-3m / min, and the flow rate of protective atmosphere ammonia decomposition gas is ≥3m 3 / H, nitrogen 1.5-2.5m 3 / H.

[0018] By adopting the above technical solution, during the hot rolling composite process, excessively high or low hot rolling temperatures will cause varying degrees of changes in the alloy structure, thereby affecting the stability of the bonding. The control and coordination between the above parameters can fully utilize the rolling capacity of the rolling mill and the high-temperature plastic deformation capacity of the material, accurately control the microstructure of the interface, and thus ensure high interface bonding strength, which is conducive to ultimately obtaining high-quality high-strength multi-layer composite packaging materials.

[0019] Preferably, in step (4), the diffusion annealing temperature is 700-720°C, the compounding speed is 1-3 m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3 m 3 / H.

[0020] By adopting the above technical solution, diffusion annealing, also known as homogenization annealing, utilizes the free diffusion of atoms or molecules to change the crystal structure and organizational state of the material through high-temperature treatment. The control and coordination between the above parameters can make the interface bonding between the silver-copper-tin alloy layer, copper layer, 4J29 alloy layer and nickel layer tighter, and reduce gaps and micro-cracks, thereby improving the application stability of the high-strength multi-layer composite packaging material.

[0021] Preferably, in step (4) and step (5), the surface pickling treatment uses a dilute sulfuric acid aqueous solution with a concentration of 10-25%, and the belt speed is 15-20 m / min.

[0022] By adopting the above technical solution, surface pickling treatment can remove surface contaminants, improve surface quality, and provide good processing conditions for subsequent treatment; and the above-mentioned concentration of dilute sulfuric acid aqueous solution and tape speed can obtain relatively ideal physical and chemical properties, thereby improving the effect and quality of subsequent processing operations, and thus ensuring the excellent quality of high-strength multi-layer composite packaging materials.

[0023] Preferably, in step (4) and step (5), the deformation amount in the cold rolling process and the finish rolling process is 30-50%.

[0024] By adopting the above technical solution, during cold rolling and finish rolling, if the deformation exceeds the above ratio, greater internal stress will be generated, causing dislocations at grain boundaries to interlock and become finer, resulting in a decrease in mechanical properties. If the deformation is below the above ratio, the production cycle will be extended. Therefore, selecting the above deformation range can ultimately produce high-quality, high-strength, multi-layer composite packaging materials while ensuring production efficiency.

[0025] Preferably, in step (5), the temperature of the intermediate heat treatment is 600-680°C, the annealing speed is 1-3 m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3 m 3 / H.

[0026] By adopting the above technical solution, excessively high temperature will cause the structure and performance of the composite material to be destroyed, and excessively low temperature will cause the interface bonding performance of the composite material to fail to meet expectations. Therefore, the selection and coordination between the above temperature and other corresponding parameters can achieve the excellent effect of eliminating residual stress, improving the organizational structure and enhancing the mechanical properties of the material, which is conducive to ultimately obtaining high-quality high-strength multi-layer composite packaging materials.

[0027] In summary, this application has the following beneficial effects: A high-strength multi-layer composite packaging material is obtained by compounding a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer and a nickel layer. It not only has high strength performance, but also has excellent application stability under temperature-changing environments. It can protect the crystal oscillator from damage when it is hit or vibrated, and can maintain better application stability when it is subjected to the stress accumulation effect caused by temperature difference. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the following examples and comparative examples.

[0029] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are all commercially available.

[0030] Example 1 A high-strength multi-layer composite packaging material is obtained by sequentially compounding a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer. The weights of the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer, and the nickel layer are shown in Table 1. The components of the silver-copper-tin alloy layer and their weights are shown in Table 2. The components of the 4J29 alloy layer and their weights are shown in Table 3. The material is prepared by the following steps: (1) preparing raw materials including a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer according to a ratio; (2) 4J29 alloy is clad with nickel in a soft state to obtain a pre-clad strip; (3) hot-rolling and laminating the pre-clad strip in step (2) with copper and silver-copper-tin alloy using a two-roll double-roll hot-clad rolling mill to obtain a composite material consisting of a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer in order from top to bottom; (4) performing diffusion annealing on the composite material obtained in step (3), performing surface pickling treatment after diffusion annealing, and performing cold rolling treatment after surface pickling treatment to obtain a blank strip; (5) The embryonic strip in step (4) is subjected to intermediate heat treatment, and then subjected to surface pickling treatment after the intermediate heat treatment, and then subjected to finish rolling treatment after the surface pickling treatment, and then the above-mentioned operation of this step is repeated until a finished strip of the required specifications is obtained, that is, a high-strength multi-layer composite packaging material.

[0031] Note: The finished product specification of the high-strength multi-layer composite packaging material obtained above is 0.07 mm × 13 mm. In step (2), the composite temperature is 825 ° C, and the composite speed is 2 m / min. In step (3), the hot rolling composite temperature is 680 ° C, the composite speed is 2 m / min, and the protective atmosphere flow rate of ammonia decomposition gas is ≥ 3 m 3 / H, nitrogen 2m 3 / H. In step (4), the diffusion annealing temperature is 710℃, the compounding speed is 1-3m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3m 3 / H. In steps (4) and (5), the surface pickling treatment uses a dilute sulfuric acid aqueous solution with a concentration of 17.5%, the belt speed is 17.5 m / min, and the deformation amount in the cold rolling and finishing treatment is 40%. In step (5), the temperature of the intermediate heat treatment is 640℃, the annealing speed is 2m / min, and the protective atmosphere flow rate is 2.5m 3 / H.

[0032] Example 2-3 A high-strength multi-layer composite packaging material is different from Example 1 in that the corresponding weights of the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer and the nickel layer are as shown in Table 1.

[0033] Table 1 Components of base fabrics in Examples 1-3 and their weight parts (kg / part) raw material Example 1 Example 2 Example 3 Silver-copper-tin alloy layer 13 9.5 16.5 Copper layer 28 27.5 28.5 4J29 alloy layer 54 61 47 Nickel layer 5 2 8 Examples 4-5 A high-strength multi-layer composite packaging material, which is different from Example 1 in that the components of the silver-copper-tin alloy layer and their corresponding weights are shown in Table 2.

[0034] Table 2 Compositions and weight percentages (kg / part) of the silver-copper-tin alloy layer in Examples 1, 4-5 Components Example 1 Example 4 Example 5 silver 67 66.5 67.5 copper 29 28.5 29.5 tin 4 5 3 Examples 6-7 A high-strength multi-layer composite packaging material, which is different from Example 1 in that the components of the 4J29 alloy layer and their corresponding weights are shown in Table 3.

[0035] Table 3 Composition and weight percentage of 4J29 alloy layer in Examples 1, 6-7 (kg / part) Components Example 1 Example 6 Example 7 nickel 29 28.5 29.5 cobalt 17 16.5 17.5 iron 54 55 53

[0036] Example 8 A high-strength multi-layer composite packaging material is different from Example 1 in that, in step (2), the composite temperature is 800° C. and the composite speed is 1 m / min.

[0037] Example 9 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (2), the composite temperature is 850° C. and the composite speed is 3 m / min.

[0038] Example 10 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (3), the temperature of hot rolling composite is 660°C, the composite speed is 1m / min, and the protective atmosphere flow rate of ammonia decomposition gas is ≥3m 3 / H, nitrogen 1.5 3 / H.

[0039] Example 11 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (3), the temperature of hot rolling composite is 700°C, the composite speed is 1m / min, and the protective atmosphere flow rate of ammonia decomposition gas is ≥3m 3 / H, nitrogen 2.5m 3 / H.

[0040] Example 12 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (4), the diffusion annealing temperature is 700°C, the composite speed is 1-3m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3m 3 / H; In steps (4) and (5), the surface pickling treatment uses a dilute sulfuric acid aqueous solution with a concentration of 10%, and the belt speed is 15 m / min.

[0041] Example 13 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (4), the diffusion annealing temperature is 720°C, the composite speed is 1-3 m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3 m 3 / H; In steps (4) and (5), the surface pickling treatment uses a dilute sulfuric acid aqueous solution with a concentration of 25%, and the belt speed is 20 m / min.

[0042] Example 14 A high-strength multi-layer composite packaging material is different from Example 1 in that, in step (4) and step (5), the deformation amount in the cold rolling treatment and the finish rolling treatment is 30%.

[0043] Example 15 A high-strength multi-layer composite packaging material is different from Example 1 in that, in step (4) and step (5), the deformation amount in the cold rolling treatment and the finish rolling treatment is 50%.

[0044] Example 16 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (5), the temperature of the intermediate heat treatment is 600°C, the annealing speed is 1m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2m 3 / H.

[0045] Example 17 A high-strength multi-layer composite packaging material, which is different from Example 1 in that, in step (5), the temperature of the intermediate heat treatment is 680°C, the annealing speed is 3m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 3m 3 / H.

[0046] Comparative Example 1 A packaging material, which differs from Example 1 in that the silver-copper-tin alloy layer is replaced by a commercially available molybdenum-copper alloy, model Mo85-Cu.

[0047] Comparative Example 2 A packaging material, which differs from Example 1 in that the 4J29 alloy layer is replaced by a commercially available CUW85 tungsten-copper alloy.

[0048] Comparative Example 3 A packaging material, which is different from Example 1, is a commercially available copper-molybdenum copper-copper CPC layered composite material, model CPC141.

[0049] Performance detection test Test samples: The high-strength multi-layer composite packaging materials obtained in Examples 1-17 are used as test samples 1-17, and the packaging materials in Comparative Examples 1-3 are used as control samples 1-3.

[0050] Test method: (1) The hardness performance of the test samples 1-17 and the control samples 1-3 as a whole is detected using a microhardness tester, and the test is performed using a force of 0.2 kg, and the hardness data of each sample is selected from 5 points, and the average value is recorded as the hardness value of the sample. The test results are recorded in Table 4.

[0051] (2) A pendulum impact test is used, and a HIT-2492 composite pendulum impact testing machine is used for operation. The pendulum is lifted to a certain height, and after being released, it impacts the test sample. The energy absorbed by the test sample is calculated by measuring the remaining energy of the pendulum, i.e. the impact absorbed work (AK), and the greater the impact absorbed work, the stronger the material's ability to withstand impact.

[0052] After the above tests on the packaging materials, the impact absorbed work value obtained is recorded as A; then the packaging materials are placed in a high-low temperature alternating test chamber, the initial temperature is 25℃, first increased to 120℃ at a rate of 2℃ / min, then decreased to -20℃ at a rate of 1.5℃ / min, then increased to 25℃ at a rate of 1℃ / min, recorded as 1 cycle, and after 20 cycles, the above test is performed in the same way, and the impact absorbed work value obtained is recorded as B; the impact resistance performance loss rate of the packaging material is calculated, and the impact resistance performance loss rate = (A-B) / A; the greater the impact resistance performance loss rate, the better the application stability of the packaging material in a temperature change environment.

[0053] After the above tests on the test samples 1-17 and the control samples 1-3 are completed in turn, the corresponding results are recorded in Table 4.

[0054] Table 4 Test results of test samples 1-17 and control samples 1-3 sample Hardness value (HV) Impact resistance loss rate (%) Test sample 1 318.5 3.34 Test sample 2 315.6 3.12 Test sample 3 317.2 3.24 Test sample 4 316.4 3.15 Test sample 5 316.1 3.26 Test sample 6 315.9 3.29 Test sample 7 317.5 3.17 Test sample 8 317.3 3.19 Test sample 9 318.0 3.30 Test sample 10 315.8 3.22 Test sample 11 316.7 3.20 Test sample 12 316.3 3.16 Test sample 13 317.6 2.23 Test sample 14 317.7 3.27 Test sample 15 316.5 3.14 Test sample 16 316.9 3.18 Test sample 17 317.8 3.21 Control sample 1 252.1 10.02 Control sample 2 243.7 10.14 Control sample 3 213.1 15.34 Combining Examples 1-3 and Comparative Examples 1-3 and Table 4, it can be seen that the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer and the nickel layer are compounded to obtain a high-strength multi-layer composite packaging material. The hardness value (HV) and the impact resistance loss rate (%) obtained by the above test are both good, indicating that it can protect the crystal oscillator from being easily damaged when it is hit or vibrated, and has excellent application stability under temperature change environments. If the silver-copper-tin alloy layer or the 4J29 alloy layer is replaced, it is found that the performance of the test results is far inferior to the excellent performance of the packaging material using the silver-copper-tin alloy layer and the 4J29 alloy layer. At the same time, compared with commercially available packaging materials, it is found that the high-strength multi-layer composite packaging material obtained in the present application has a significant improvement in hardness value (HV) and impact resistance loss rate (%), indicating that the actual application effect is significantly better.

[0055] Combining Example 1 and Examples 4-5 and Table 4, it can be seen that the silver-copper-tin alloy layer contains 66.5-67.5 parts of silver, 28.5-29.5 parts of copper, and 3.5-4.5 parts of tin. The synergistic effect between the elements is good, and a uniform and stable composite structure can be formed with the copper layer, 4J29 alloy layer, and nickel layer, thereby being able to exert better corresponding effects, and ultimately obtaining a high-quality, high-strength, multi-layer composite packaging material.

[0056] Combining Example 1 and Examples 6-7 with Table 4, it can be seen that the 4J29 alloy layer contains 28.5-29.5 parts of nickel, 16.5-17.5 parts of cobalt, and 53-55 parts of iron. The synergistic effect between the elements is good, and after being compounded with the silver-copper-tin alloy layer, the copper layer, and the nickel layer, a high-strength multi-layer composite packaging material with good application quality can be obtained.

[0057] It can be seen from Example 1 and Examples 8-17 and Table 4 that in the preparation of high-strength multi-layer composite packaging materials in the present application, the selection and coordination of each control parameter in each step can ensure the effect and quality of the processing operation, thereby obtaining a high-strength multi-layer composite packaging material with excellent and stable quality.

[0058] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-strength multi-layer composite packaging material, characterized in that: The silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer and the nickel layer are compounded in sequence, and the corresponding weight parts of the silver-copper-tin alloy layer, the copper layer, the 4J29 alloy layer and the nickel layer are as follows: 9.5-16.5 parts of silver-copper-tin alloy layer; Copper layer 27.5-28.5 parts; 4J29 alloy layer 47-61 parts; 2-8 layers of nickel.

2. The high-strength multi-layer composite packaging material according to claim 1, characterized in that: The silver-copper-tin alloy layer comprises the following components in parts by weight: 66.5-67.5 parts of silver; Copper 28.5-29.5 parts; 3-5 parts of tin.

3. The high-strength multi-layer composite packaging material according to claim 1, characterized in that: The 4J29 alloy layer comprises the following components in parts by weight: Nickel 28.5-29.5 parts; Cobalt 16.5-17.5 parts; 53-55 parts of iron.

4. The method for preparing the high-strength multi-layer composite packaging material according to claim 1, characterized in that: The following steps are involved: (1) preparing raw materials including a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer according to a ratio; (2) 4J29 alloy is clad with nickel in a soft state to obtain a pre-clad strip; (3) hot-rolling and laminating the pre-clad strip in step (2) with copper and silver-copper-tin alloy using a two-roll double-roll hot-clad rolling mill to obtain a composite material consisting of a silver-copper-tin alloy layer, a copper layer, a 4J29 alloy layer, and a nickel layer in order from top to bottom; (4) performing diffusion annealing on the composite material obtained in step (3), performing surface pickling treatment after diffusion annealing, and performing cold rolling treatment after surface pickling treatment to obtain a blank strip; (5) The embryonic strip in step (4) is subjected to intermediate heat treatment, and then subjected to surface pickling treatment after the intermediate heat treatment, and then subjected to finish rolling treatment after the surface pickling treatment, and then the above-mentioned operation of this step is repeated until a finished strip of the required specifications is obtained, that is, a high-strength multi-layer composite packaging material.

5. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (2), the compounding temperature is 800-850°C and the compounding speed is 1-3 m / min.

6. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (3), the temperature of hot rolling composite is 660-700℃, the composite speed is 1-3m / min, and the protective atmosphere flow rate of ammonia decomposition gas is ≥3m 3 / H, nitrogen 1.5-2.5m 3 / H.

7. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (4), the diffusion annealing temperature is 700-720°C, the annealing speed is 1-3m / min, and the protective atmosphere flow rate is 2-3m 3 / H.

8. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (4) and step (5), the surface pickling treatment uses a dilute sulfuric acid aqueous solution with a concentration of 10-25% and a conveying speed of 15-20 m / min.

9. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (4) and step (5), the deformation amount in the cold rolling process and the finish rolling process is 30-50%.

10. The method for preparing a high-strength multi-layer composite packaging material according to claim 4, characterized in that: In step (5), the temperature of the intermediate heat treatment is 600-680°C, the annealing speed is 1-3m / min, and the protective atmosphere flow rate of ammonia decomposition gas is 2-3m 3 / H.