High-strength and high-conductivity silver strip for fuse and preparation method of high-strength and high-conductivity silver strip

Abstract

The invention discloses a high-strength and high-conductivity silver strip for a fuse and a preparation method thereof.The high-strength and high-conductivity silver strip for the fuse comprises pure silver and an enhancer, the mass of the enhancer accounts for 0.005-0.01% of the mass of the pure silver, the enhancer is one or a mixture of zirconium oxide, calcium oxide, calcium boride and zirconium boride, and after smelting and pouring, the enhancer is fine and dispersedly distributed at the silver grain boundary; therefore, grain dislocation is hindered; and on the other hand, the reinforcer is added, the pure silver is preferentially attached to the reinforcer for heterogeneous nucleation during solidification, the nucleation rate is increased, and therefore the grain refining effect is achieved. By adding the non-metal enhancer, under the condition that it is guaranteed that the resistivity meets the requirement of pure silver for a fuse, the mechanical property of the pure silver is remarkably improved, the rolling strip breakage risk is reduced, and then the yield of the prepared silver strip with the thickness smaller than 0.05 mm is increased.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, and in particular to a high-strength and high-conductivity silver ribbon for a fuse and a preparation method thereof. Background Art

[0002] Pure silver strips are widely used as melt materials in the fuse industry because of their excellent electrical conductivity. At present, the thickness of pure silver strips used as fuse melt materials is mainly 0.08-0.15mm, and the resistivity is required to be less than 16.40. Due to the increasing price of pure silver raw materials, in order to reduce costs and control consumption, melt materials are gradually developing towards ultra-thinness. However, in the process of using pure silver to process ultra-thin pure silver strips, due to the poor mechanical properties of pure silver, when rolling ultra-thin strips, in order to control the strip shape, the winding and unwinding tension needs to be increased. The low mechanical properties of pure silver can easily lead to broken strips during rolling. On the other hand, pure silver strips need to be punched into narrow diameters when making fuses. The insufficient strength of pure silver can easily lead to breakage at the narrow diameter during punching.

[0003] Therefore, people have adopted a variety of solutions. One solution is a silver sheet for fuses disclosed in a Chinese patent with publication number CN109686630A. Although the resulting melt has good electrical conductivity and self-arc extinguishing ability, the melting point is suitable and has excellent processing performance, the solution adopts a structure of silver-copper alloy wrapped with pure silver. The conductivity of the silver-copper alloy is between that of silver and copper, and is lower than that of pure silver. This is because the presence of different atoms in the alloy interferes with the conduction of electrons. Inside the alloy, the lattice structure will change due to the mixing of two different metal atoms. When electrons move in this complex lattice, they will be subject to more scattering, thereby reducing the conductivity of the entire silver sheet, so it cannot be used in fuses with higher-end requirements and more sensitive response requirements.

[0004] Therefore, those skilled in the art are committed to developing a silver ribbon for fuses having high strength and high conductivity and a preparation method thereof. Summary of the invention

[0005] In view of the deficiencies of the prior art, an object of the present invention is to provide a silver ribbon for fuses having high strength and high conductivity and a preparation method thereof.

[0006] To achieve the aforementioned object of the invention, the present invention provides a high-strength and high-conductivity silver strip for a fuse, comprising pure silver and a strengthening agent, wherein the mass of the strengthening agent is 0.005-0.01% of the mass of the pure silver, and the strengthening agent is one or a mixture of several selected from zirconium oxide, calcium oxide, calcium boride and zirconium boride.

[0007] Furthermore, the purity of the pure silver is ≥99.99%.

[0008] Furthermore, the purity of the enhancer is ≥99.9%.

[0009] The present invention also provides a method for preparing the high-strength and high-conductivity silver ribbon for the fuse, comprising the following steps:

[0010] (1) Ingredients: weigh the required raw materials;

[0011] (2) Vacuum melting: pure silver is placed in a vacuum induction furnace to obtain pure silver melt;

[0012] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0013] (4) casting: casting the silver melt containing the strengthening agent obtained in step (3) into a mold;

[0014] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0015] (6) hot forging: hot forging the ingot obtained in step (5) into a pure silver billet to remove shrinkage defects;

[0016] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0017] (8) Rolling: The pure silver billet obtained in step (7) is rolled.

[0018] Furthermore, in step (2), the smelting temperature is 1150-1250° C., and the smelting time is 40-50 min.

[0019] Furthermore, the silver melt containing the strengthening agent obtained in step (4) is tilted and swung for 5-10 times, and then cast into a mold at a melt temperature of 1100-1200°C.

[0020] Furthermore, in step (6), the initial hot forging temperature is 500-600° C., and a pure silver billet of 35×80 mm is forged in one pass.

[0021] Furthermore, in step (8), a slab mill and a finishing mill are used to roll the finished silver strip into a 0.02-0.15 mm pure silver finished strip.

[0022] Furthermore, the pass processing rate is 20-25%.

[0023] Furthermore, the thickness of the silver strip is less than 0.05 mm.

[0024] Compared with the prior art, the advantages of the present invention are that a small amount of strengthening agents such as zirconium oxide, calcium oxide, calcium boride and zirconium boride are added to the pure silver solution during smelting, and after smelting and pouring, the strengthening agents are finely dispersed at the silver grain boundaries, thereby hindering grain dislocation. On the other hand, when the strengthening agents are added, the pure silver preferentially adheres to the strengthening agents for heterogeneous nucleation during solidification, increasing the nucleation rate, thereby achieving the effect of grain refinement. The present invention significantly improves the mechanical properties of pure silver and reduces the risk of rolling broken strips by adding non-metallic strengthening agents while ensuring that the resistivity of pure silver meets the requirements of pure silver for fuses, thereby improving the yield rate of preparing silver strips with a thickness of less than 0.05 mm.

[0025] The inventor's experiments show that after the silver strip of the present invention is added with a strengthening agent, the resistivity still meets the resistivity requirement of pure silver strip for fuse (<16.40μΩ·mm), while the tensile strength can reach up to 303MPa, and the yield rate can reach up to 56.8%, both of which are significantly improved, significantly improving the mechanical properties of pure silver, and solving the problems of ultra-thin silver strip being easy to break during rolling, and being easy to break at the narrow diameter during stamping due to insufficient strength when used to make fuse pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the present invention;

[0027] Figure 2 This is the conventional pure silver metallographic structure of the comparative example;

[0028] Figure 3 This is the metallographic structure of the silver belt in Example 1. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to understand the characteristics and effects of the present application, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used herein have the common meanings understood by those skilled in the art for the present application. In case of conflict, the definitions in this specification shall prevail.

[0030] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present application in any way, that is, the content of the present application can be implemented without being limited by any specific theory or mechanism.

[0031] As used herein, "this application" means "the present invention" or "the present disclosure".

[0032] The use of "one", "an", "a kind" or similar expressions to describe the components and technical features described in this application is merely for the convenience of expression and to provide a general meaning to the scope of this application. Therefore, such description should be understood to include one or at least one, and the singular also includes the plural, unless it is obvious that it refers to another meaning.

[0033] In this document, "or its combination" means "or any combination thereof", and "any one", "any one" means "any one", "any one" or "any one".

[0034] As used herein, the terms "comprises," "including," "having," "containing," or any other similar terms are open-ended transitional phrases that are intended to cover non-exclusive inclusions. For example, a composition or article containing multiple elements is not limited to the elements listed herein, but may also include other elements that are not explicitly listed but are generally inherent to the composition or article. In addition, unless otherwise expressly stated, the term "or" refers to an inclusive "or" rather than an exclusive "or." For example, any of the following situations satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist), A is false (or does not exist) and B is true (or exists), and both A and B are true (or exist). In addition, in this article, the terms "comprising", "including", "having", and "containing" should be interpreted as being specifically disclosed and simultaneously covering closed conjunctions such as "consisting of", "consisting of", and "the remainder is", as well as conjunctions such as "consisting essentially of", "mainly consisting of", "mainly consisting of", "basically containing", "essentially consisting of", "essentially consisting of", and "essentially containing".

[0035] In this article, all features or conditions such as numerical values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be deemed to have covered and specifically disclosed all possible sub-ranges and individual values ​​within the range (including integers and fractions), especially integer values. For example, the range description of "1.0 to 8.0" or "between 1.0 and 8.0" or "between 1.0 and 8.0" should be deemed to have specifically disclosed all sub-ranges such as 1.0 to 8.0, 1.0 to 7.0, 2.0 to 8.0, 2.0 to 6.0, 3.0 to 6.0, 4.0 to 8.0, 3.0 to 8.0, etc., and should be deemed to cover endpoint values, especially sub-ranges defined by integer values, and should be deemed to have specifically disclosed individual values ​​such as 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, etc. Unless otherwise indicated, the foregoing method of interpretation applies to all contents of the entire application, regardless of whether the scope is broad or not.

[0036] If the quantity, concentration or other numerical value or parameter is expressed as a range, a preferred range (or a better range) or a series of upper and lower limits, it should be understood that all ranges consisting of any pair of the upper limit or preferred value (or a better value) of the range and the lower limit or preferred value (or a better value) of the range have been specifically disclosed herein, regardless of whether these ranges are disclosed separately. In addition, if a numerical range is mentioned herein, unless otherwise specified, the range should include its endpoints and all integers and fractions within the range.

[0037] In this document, numerical values ​​should be understood to have the accuracy of the number of significant digits of the numerical value, provided that the purpose of the invention can be achieved. For example, the number 40.0 should be understood to cover the range of 39.50 to 40.49.

[0038] It should be understood that the features disclosed in the various embodiments herein may be arbitrarily combined to form the technical solution of the present application, as long as there is no contradiction in the combination of these features.

[0039] The present application will be described below with specific implementations and examples. It should be understood that these specific implementations and examples are merely illustrative and are not intended to limit the scope of the present application and its use.

[0040] Unless otherwise stated, the methods, reagents and conditions used in the following preparation examples, comparative examples and examples are conventional methods, reagents and conditions in the art.

[0041] Comparative Example

[0042] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%.

[0043] (2) Vacuum melting: pure silver is placed in a vacuum induction furnace at a melting temperature of 1150-1250°C for 40 min to obtain pure silver melt;

[0044] (3) Casting: The melt obtained in step (2) is cast into a mold at a temperature of 1100-1200° C.;

[0045] (4) Turning: turning the pure silver ingot obtained in step (3) to remove surface cold shut defects;

[0046] (5) Hot forging: The ingot obtained in step (4) is hot forged with an air hammer, the initial temperature of the hot forging is 500° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0047] (6) Planing: The pure silver blank obtained in step (5) is planed to remove surface hammer mark defects and perform chamfering;

[0048] (7) Rolling: The pure silver blank obtained in step (6) is rolled into a 0.02 mm thick silver strip finished product using a blanking rolling mill and a finishing rolling mill, with a pass processing rate of 30%.

[0049] Example 1

[0050] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 1.5 g (0.005%) of calcium oxide as a strengthening agent, the purity of which is ≥ 99.9%.

[0051] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0052] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (1) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0053] (4) Casting: The silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 5 times, and then cast into a mold at a melt temperature of 1100-1150°C.

[0054] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0055] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial hot forging temperature is 500° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0056] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0057] (8) Rolling: The pure silver blank obtained in step (7) is rolled into a 0.02 mm thick silver strip finished product using a blanking rolling mill and a finishing rolling mill, with a pass processing rate of 30%.

[0058] Example 2

[0059] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 1.8 g (0.006%) of zirconium oxide as a strengthening agent, the purity of which is ≥ 99.9%.

[0060] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0061] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0062] (4) Casting: The silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 5 times, and then cast into a mold at a melt temperature of 1100-1150°C.

[0063] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0064] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial temperature of the hot forging is 500° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0065] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0066] (8) Rolling: The pure silver blank obtained in step (7) is rolled into a 0.02 mm thick silver strip finished product using a blanking rolling mill and a finishing rolling mill, with a pass processing rate of 30%.

[0067] Example 3

[0068] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 2.1 g (0.007%) of calcium boride as a strengthening agent, the purity of which is ≥ 99.9%.

[0069] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0070] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0071] (4) Casting: After the silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 5 times, it is cast into a mold at a melt temperature of 1100-1150° C.;

[0072] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0073] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial hot forging temperature is 550° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0074] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0075] (8) Rolling: The pure silver billet obtained in step (7) is rolled into a 0.02 mm thick silver strip product using a billet rolling mill and a finishing rolling mill, with a pass processing rate of 25%.

[0076] Example 4

[0077] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 2.4 g (0.008%) of zirconium boride as a strengthening agent, the purity of which is ≥ 99.9%.

[0078] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0079] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0080] (4) Casting: After the silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 10 times, it is poured into a mold at a melt temperature of 1150-1200° C.;

[0081] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0082] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial hot forging temperature is 550° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0083] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0084] (8) Rolling: The pure silver billet obtained in step (7) is rolled into a 0.02 mm thick silver strip product using a billet rolling mill and a finishing rolling mill, with a pass processing rate of 25%.

[0085] Example 5

[0086] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 2.7 g (0.009%) of a mixture of calcium oxide and zirconium oxide as a strengthening agent in a weight ratio of 1:1, the purity of which is greater than or equal to 99.9%.

[0087] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0088] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0089] (4) Casting: After the silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 10 times, it is poured into a mold at a melt temperature of 1150-1200° C.;

[0090] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0091] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial temperature of the hot forging is 600° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0092] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0093] (8) Rolling: The pure silver billet obtained in step (7) is rolled into a 0.02 mm thick silver strip product using a billet rolling mill and a finishing rolling mill, with a pass processing rate of 20%.

[0094] Example 6

[0095] (1) Ingredients: Weigh 30,000 g of pure silver ingot, the purity of which is greater than 99.99%, and weigh 3.0 g (0.01%) of a mixture of calcium boride and zirconium boride as a strengthening agent in a weight ratio of 1:1, the purity of which is greater than or equal to 99.9%.

[0096] (2) Vacuum melting: Put pure silver into a vacuum induction furnace at a melting temperature of 1150-1250°C for 40-50 min to obtain pure silver melt;

[0097] (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes;

[0098] (4) Casting: After the silver melt containing the strengthening agent obtained in step (3) is tilted and swung for 10 times, it is poured into a mold at a melt temperature of 1150-1200° C.;

[0099] (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects;

[0100] (6) Hot forging: The ingot obtained in step (5) is hot forged with an air hammer, the initial temperature of the hot forging is 600° C., and one pass is forged into a 35×80 mm pure silver billet to remove shrinkage defects;

[0101] (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering;

[0102] (8) Rolling: The pure silver billet obtained in step (7) is rolled into a 0.02 mm thick silver strip finished product using a billet rolling mill and a finishing rolling mill, with a pass processing rate of 20%.

[0103] The resistivity, tensile strength and yield rate of the above comparative examples and embodiments were analyzed, wherein the resistivity test was performed in accordance with GB / T351-2019 (Method for measuring the resistivity of metal materials); the tensile strength test was performed in accordance with GB / T228.1-2021 (Metallic material tensile test Part 1: Room temperature test method); the yield rate was obtained based on the ratio of the weight of the finished silver strip with a thickness of 0.02 mm to the weight of the smelting feed. The results are shown in the following table:

[0104] Example additive Proportion / % Resistivity / μΩ·mm Tensile strength / MPa Yield rate / % Comparative Example / / 16.12 244 37.3 Example 1 Calcium Oxide 0.005 16.28 276 46.6 Example 2 Zirconia 0.006 16.24 282 48.2 Example 3 Zirconium boride 0.007 16.33 290 54.6 Example 4 Calcium boride 0.008 16.20 293 55.1 Example 5 Calcium oxide + zirconium oxide 0.009 16.32 297 56.3 Example 6 Calcium boride + zirconium boride 0.01 16.36 303 56.8

[0105] It can be seen from the above table that compared with the control example without adding a strengthening agent, after adding the strengthening agent to Examples 1 to 6, although the resistivity is slightly increased, it still meets the resistivity requirement of pure silver strip for fuses (<16.40μΩ·mm), and the tensile strength and yield rate are significantly improved.

[0106] In addition, Figure 2 and Figure 3It can also be seen from the metallographic photographs that the conventional pure silver metallographic structure of the comparative example has almost no heterogeneous nucleation, while the pure silver metallographic structure of Example 1 has obviously many heterogeneous nuclei of the strengthener, which are in the form of dark dots or strips. The strengthener is finely dispersed at the silver grain boundaries, thereby hindering grain dislocation; it also shows that pure silver preferentially adheres to the strengthener heterogeneous nucleation during solidification, increasing the nucleation rate, thereby achieving the effect of grain refinement.

[0107] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, some simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-strength and high-conductivity silver ribbon for fuses, characterized in that: The invention comprises pure silver and a strengthening agent, wherein the weight of the strengthening agent is 0.005-0.01% of the weight of the pure silver, and the strengthening agent is one or a mixture of zirconium oxide, calcium oxide, calcium boride and zirconium boride.

2. The high-strength and high-conductivity silver ribbon for fuse according to claim 1, characterized in that: The purity of the pure silver is ≥99.99%.

3. The high-strength and high-conductivity silver ribbon for fuse according to claim 1, characterized in that: The purity of the enhancer is ≥99.9%.

4. A method for preparing the high-strength and high-conductivity silver ribbon for fuses according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Ingredients: weigh the required raw materials; (2) Vacuum melting: pure silver is placed in a vacuum induction furnace to obtain pure silver melt; (3) Adding a strengthening agent: introducing argon gas into the silver melt obtained in step (2) for protection, the melting temperature is 1100-1200° C., and the strengthening agent is added after keeping the temperature for 5-10 minutes; (4) casting: casting the silver melt containing the strengthening agent obtained in step (3) into a mold; (5) Turning: turning the pure silver ingot obtained in step (4) to remove surface cold shut defects; (6) hot forging: hot forging the ingot obtained in step (5) into a pure silver billet to remove shrinkage defects; (7) Planing: The pure silver blank obtained in step (6) is planed to remove surface hammer mark defects and perform chamfering; (8) Rolling: The pure silver billet obtained in step (7) is rolled.

5. The method for preparing the high-strength and high-conductivity silver ribbon for fuse according to claim 4, characterized in that: In step (2), the smelting temperature is 1150-1250° C. and the smelting time is 40-50 min.

6. The method for preparing the high-strength and high-conductivity silver ribbon for fuse according to claim 4, characterized in that: The silver melt containing the strengthening agent obtained in step (4) is tilted and swung for 5-10 times, and then cast into a mold at a melt temperature of 1100-1200°C.

7. The method for preparing the high-strength and high-conductivity silver ribbon for fuse according to claim 4, characterized in that: In step (6), the initial hot forging temperature is 500-600°C, and a pure silver billet of 35×80 mm is forged in one pass.

8. The method for preparing the high-strength and high-conductivity silver ribbon for fuse according to claim 4, characterized in that: In step (8), a slab mill and a finishing mill are used to roll the finished silver strip into a 0.02-0.15 mm pure silver finished strip.

9. The method for preparing the high-strength and high-conductivity silver ribbon for fuse according to claim 8, characterized in that: The pass processing rate is 20-25%.

10. The high-strength and high-conductivity silver ribbon for fuse according to claim 1, characterized in that: The thickness of the silver strip is less than 0.05 mm.

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