Silver-copper composite melt and preparation method thereof

Abstract

The invention provides a silver-copper composite melt which comprises a silver layer, a copper layer and connecting layers, the connecting layers comprise the first connecting layer and the second connecting layer, the first connecting layer is made of silver metal, the thickness of the first connecting layer is smaller than that of the silver layer, a plurality of silver layer grooves are formed in one side of the first connecting layer, and the second connecting layer is made of silver metal. The other side of the first connecting layer is welded with the silver layer; the second connecting layer is made of copper metal, the thickness of the second connecting layer is smaller than that of the copper layer, one side of the second connecting layer is welded to the copper layer, the other side of the second connecting layer is welded to one side of the first connecting layer, a plurality of copper layer protrusions are arranged on the other side of the second connecting layer, and the copper layer protrusions are arranged on the other side of the second connecting layer. And the plurality of copper layer bulges are in one-to-one correspondence with the plurality of silver layer grooves, and each copper layer bulge is embedded with the corresponding silver layer groove. The firmness between the copper layer and the silver layer is reinforced through the connecting layer, and cracking of the copper layer and the silver layer is avoided.

Description

Technical Field

[0001] The invention belongs to the field of electrical engineering, and in particular relates to a silver-copper composite melt and a preparation method thereof. Background Art

[0002] A fuse is an electrical device that protects a circuit. When the circuit current is too large due to various reasons such as overload or short circuit, the fuse material is melted by the thermal effect of the large current to break the circuit and protect the circuit. The fuse includes a shell, a connection terminal, a fuse and an arc extinguishing medium. The fuse is generally made of a composite of copper and silver strips, and the copper and silver strips are connected together by welding or extrusion. Since the copper and silver strips are easy to split, the fusing characteristics of the fuse are reduced. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a silver-copper composite melt and a preparation method thereof, wherein the connection layer strengthens the firmness between the copper layer and the silver layer to prevent cracking.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: First, the present invention provides a silver-copper composite melt, comprising: a silver layer, a copper layer and a connecting layer, the connecting layer comprising a first connecting layer and a second connecting layer, the first connecting layer is made of silver metal, and its thickness is less than the thickness of the silver layer, one side of the first connecting layer is provided with a plurality of silver layer grooves, and the other side of the first connecting layer is welded to the silver layer; the second connecting layer is made of copper metal, and its thickness is less than the thickness of the copper layer, one side of the second connecting layer is welded to the copper layer, and the other side of the second connecting layer is welded to one side of the first connecting layer, a plurality of copper layer protrusions are provided on the other side of the second connecting layer, the plurality of copper layer protrusions correspond to the plurality of silver layer grooves one by one, and each copper layer protrusion is engaged with the corresponding silver layer groove.

[0005] Preferably, the connecting layer also includes a third connecting layer made of silver metal, the third connecting layer is arranged between the first connecting layer and the silver layer, one side of the first connecting layer is connected to the silver layer, and the other side is connected to the first connecting layer, and the thickness of the third connecting layer is greater than the thickness of the first connecting layer and less than the thickness of the silver layer.

[0006] Preferably, the thickness of the first connecting layer is 0.1-0.2 mm.

[0007] Preferably, the thickness of the third connecting layer is 0.3-0.4 mm.

[0008] Preferably, the thickness of the silver layer is 2-4 mm.

[0009] Preferably, the connecting layer also includes a fourth connecting layer made of copper metal, which is arranged between the second connecting layer and the copper layer, one side of the fourth connecting layer is connected to the second connecting layer, and the other side is connected to the copper layer, and the thickness of the fourth connecting layer is greater than the thickness of the second connecting layer.

[0010] Preferably, the second connecting layer has a thickness of 0.1-0.2 mm.

[0011] Preferably, the fourth connecting layer has a thickness of 0.3-0.4 mm.

[0012] Preferably, the copper layer has a thickness of 8-15 mm.

[0013] Secondly, the present invention provides a method for preparing the silver-copper composite melt, comprising the following steps: S1, welding the first connecting layer and the second connecting layer; S2, welding the silver layer to a side of the first connecting layer away from the second connecting layer; S3. Welding the copper layer to a side of the second connection layer away from the first connection layer.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adds the connecting layer between the copper layer and the silver layer, and the connecting layer includes a first connecting layer made of silver metal and a second connecting layer made of copper metal. Since the thickness of the first connecting layer and the second connecting layer are respectively smaller than the silver layer and the copper layer, when the first connecting layer and the second connecting layer are welded, the fusion of the first connecting layer and the second connecting layer is facilitated, and the welding of the silver layer and the first connecting layer is more secure. Since the material of the first connecting layer and the silver layer is the same, the welding of the silver layer and the first connecting layer is more secure. The material of the second connecting layer is the same as that of the copper layer, and the connection between the second connecting layer and the copper layer is also more secure, that is, the firmness between the copper layer and the silver layer is reinforced by the connecting layer to prevent cracking.

[0015] (2) In the present invention, a plurality of silver layer grooves are provided on one side of the first connecting layer, and a plurality of copper layer protrusions are provided on the other side of the second connecting layer. The plurality of copper layer protrusions correspond to the plurality of silver layer grooves one by one, and each copper layer protrusion is engaged with the corresponding silver layer groove, thereby improving the stability of the connecting layer, and further improving the firmness between the copper layer and the silver layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a silver-copper composite melt provided by one embodiment of the present invention; Figure 2 for Figure 1 A bottom view of the first connection layer in FIG. Figure 3 for Figure 1 Top view of the second connection layer in FIG.

[0017] Figure numerals: silver-copper composite melt 100 , silver layer 1 , copper layer 2 , connecting layer 3 , first connecting layer 31 , silver layer groove 311 , second connecting layer 32 , copper layer protrusion 321 , third connecting layer 33 , fourth connecting layer 34 . DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0019] Combination Figure 1-3 The present invention provides a silver-copper composite melt 100, comprising: a silver layer 1, a copper layer 2 and a connecting layer 3, wherein the connecting layer 3 comprises a first connecting layer 31 and a second connecting layer 32, wherein the first connecting layer 31 is made of silver metal and has a thickness less than that of the silver layer 1, and a plurality of silver layer grooves 311 are arranged on one side of the first connecting layer 31, and the other side of the first connecting layer 31 is welded to the silver layer 1; the second connecting layer 32 is made of copper metal and has a thickness less than that of the copper layer 2, and a first side of the second connecting layer 32 is welded to the copper layer 2, and the other side of the second connecting layer 32 is welded to a first side of the first connecting layer 31, and a plurality of copper layer protrusions 321 are arranged on the other side of the second connecting layer 32, and the plurality of copper layer protrusions 321 correspond to the plurality of silver layer grooves 311 one by one, and each copper layer protrusion 321 is embedded in the corresponding silver layer groove 311.

[0020] In the above technical solution, the specific thickness of the silver layer 1 and the copper layer 2 is not limited. In order to save materials, the thickness of the silver layer 1 is generally less than the thickness of the copper layer 2. In order to strengthen the connection tightness between the silver layer 1 and the copper layer 2 and avoid the splitting between the silver layer 1 and the copper layer 2, the present application sets the connecting layer 3 between the silver layer 1 and the copper layer 2. The thickness of the connecting layer 3 is less than the thickness of the silver layer 1 and the copper layer 2, which is convenient for melting and firm welding at high temperature. The connecting layer 3 includes a first connecting layer 31, which is made of silver metal and has a thickness less than the silver layer 1. The second connecting layer 32 is made of copper metal and has a thickness less than the copper layer 2. The welding tightness between the first connecting layer 31 and the second connecting layer 32 is higher. Since the first connecting layer 31 and the silver layer 1 are made of the same material, the silver layer 1 and the first connecting layer 31 are tightly connected through welding and have a high degree of fusion. Similarly, the copper layer 2 and the second connecting layer 32 are made of the same material, and the second connecting layer 32 and the copper layer 2 are tightly connected and have a high degree of fusion. Furthermore, in order to improve the stability of the connecting layer 3, and further improve the firmness between the copper layer 2 and the silver layer 1. The first connecting layer 31 and the second connecting layer 32 are matched through protrusions and grooves to increase the stability and contact area. The present application does not limit the specific number of the multiple silver layer grooves 311, which can be evenly spaced to cover the side of the first connecting layer 31 close to the second connecting layer 32. The copper layer protrusions 321 can be matched with the silver layer grooves 311.

[0021] Furthermore, the connection layer 3 also includes a third connection layer 33 made of silver metal, which is arranged between the first connection layer 31 and the silver layer 1, one side of the third connection layer 33 is connected to the silver layer 1, and the other side is connected to the first connection layer 31, and the thickness of the third connection layer 33 is greater than the thickness of the first connection layer 31, and less than the thickness of the silver layer 1. The third connection layer 33 is arranged between the first connection layer 31 and the silver layer 1, and the third connection layer 33 also plays a role in strengthening the tightness. In the present application, the thickness gradually increases from the first connection layer 31, the third connection layer 33 to the silver layer 1, further enhancing its bonding tightness.

[0022] In some embodiments, the thickness of the first connecting layer 31 is 0.1-0.2 mm, for example, its thickness can be 0.1 mm, 0.15 mm or 0.2 mm. The thin thickness is convenient for improving the adhesion of welding. In some embodiments, the thickness of the third connecting layer 33 is 0.3-0.4 mm, for example, its thickness can be 0.3, 0.35 or 0.4 mm. In some embodiments, the thickness of the silver layer 1 is 2-4 mm. For example, its thickness can be 2 mm, 3 mm or 4 mm.

[0023] Furthermore, the connection layer 3 also includes a fourth connection layer 34 made of copper metal, the fourth connection layer 34 is arranged between the second connection layer 32 and the copper layer 2, one side of the fourth connection layer 34 is connected to the second connection layer 32, and the other side is connected to the copper layer 2, and the thickness of the fourth connection layer 34 is greater than the thickness of the second connection layer 32. The fourth connection layer 34 is arranged between the second connection layer 32 and the copper layer 2, and the fourth connection layer 34 also plays a role in strengthening the tightness. In this application, the thickness gradually increases from the second connection layer 32, the fourth connection layer 34 to the copper layer 2, further enhancing its bonding tightness.

[0024] In some embodiments, the thickness of the second connection layer 32 is 0.1-0.2 mm. For example, its thickness can be 0.1 mm, 0.15 mm or 0.2 mm. The thin thickness is convenient for improving the adhesion of welding. In some embodiments, the thickness of the third connection layer 33 is 0.3-0.4 mm, for example, its thickness can be 0.3, 0.35 or 0.4 mm. In some embodiments, the thickness of the copper layer 2 is 8-15 mm, for example, its thickness can be 8 mm, 10 mm or 15 mm.

[0025] The present invention also provides a method for preparing the silver-copper composite melt 100, comprising the following steps: S1, welding the first connection layer 31 and the second connection layer 32; S2, welding the silver layer 1 to a side of the first connection layer 31 away from the second connection layer 32; S3 . Weld the copper layer 2 to a side of the second connection layer 32 away from the first connection layer 31 .

[0026] In the above technical solution, the present application first connects the first connection layer 31 and the second connection layer 32, the purpose of which is to better fuse the silver and copper materials together and improve the tight bonding between the silver and copper, and then connects the silver layer 1 and the copper layer 2 to the connection layer 3, thereby improving the tight bonding between the silver layer 1 and the copper layer 2. In the preparation method, the present application does not limit the specific operation steps and operation parameters of welding, welding is a prior art, as long as the two can be welded tightly.

[0027] Example 1 The present invention provides a silver-copper composite melt 100, wherein the thickness of the silver layer 1 is 2 mm, the thickness of the third connecting layer 33 is 0.3 mm, the thickness of the first connecting layer 31 is 0.1 mm, the thickness of the second connecting layer 32 is 0.1 mm, the thickness of the fourth connecting layer 34 is 0.3 mm, and the thickness of the copper layer 2 is 8 mm. The length of the silver-copper composite melt 100 is set to 50 mm and the width is set to 30 mm. First, the first connecting layer 31 and the second connecting layer 32 are welded together, and then the third connecting layer 33 and the fourth connecting layer 34 are welded in sequence, and finally the silver layer 1 and the copper layer 2 are welded.

[0028] Example 2 The present invention provides a silver-copper composite melt 100, which is the same as Example 1, except that the thickness of the silver layer 1 is 2 mm, the thickness of the third connecting layer 33 is 0.4 mm, the thickness of the first connecting layer 31 is 0.2 mm, the thickness of the second connecting layer 32 is 0.2 mm, the thickness of the fourth connecting layer 34 is 0.4 mm, and the thickness of the copper layer 2 is 8 mm.

[0029] Comparative Example 1 The present invention provides a silver-copper composite melt, wherein the thickness of the silver layer 1 is 2 mm, the thickness of the copper layer 2 is 8 mm, the silver layer 1 and the copper layer 2 are welded together by the same welding method as in Example 1, and the length and width of the silver-copper composite melt are also the same as in Example 1.

[0030] Performance Testing and Results The silver-copper composite melts prepared in Examples 1 and 2 and Comparative Example 1 were subjected to a tensile test to detect the critical tensile force for silver-copper splitting. The results are shown in Table 1.

[0031] Table 1

[0032] It can be seen from Table 1 that by providing a thinner connecting layer 3, the silver layer 1 and the copper layer 2 can be better connected.

[0033] The specific raw materials not described in the present invention are all existing materials and can be directly purchased from the market.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A silver-copper composite melt, characterized in that: include: A silver layer, a copper layer and a connecting layer, wherein the connecting layer comprises: A first connection layer is made of silver metal and has a thickness less than that of the silver layer, a plurality of silver layer grooves are provided on one side of the first connection layer, and the other side of the first connection layer is welded to the silver layer; The second connecting layer is made of copper metal and has a thickness less than that of the copper layer. One side of the second connecting layer is welded to the copper layer, and the other side of the second connecting layer is welded to one side of the first connecting layer. A plurality of copper layer protrusions are provided on the other side of the second connecting layer. The plurality of copper layer protrusions correspond one-to-one to the plurality of silver layer grooves, and each copper layer protrusion is engaged with the corresponding silver layer groove.

2. The silver-copper composite melt according to claim 1, characterized in that: The connecting layer also includes a third connecting layer made of silver metal, which is arranged between the first connecting layer and the silver layer. One side of the first connecting layer is connected to the silver layer, and the other side is connected to the first connecting layer. The thickness of the third connecting layer is greater than the thickness of the first connecting layer and less than the thickness of the silver layer.

3. The silver-copper composite melt according to claim 2, characterized in that: The thickness of the first connecting layer is 0.1-0.2 mm.

4. The silver-copper composite melt according to claim 2, characterized in that: The thickness of the third connecting layer is 0.3-0.4 mm.

5. The silver-copper composite melt according to claim 3, characterized in that: The thickness of the silver layer is 2-4 mm.

6. The silver-copper composite melt according to claim 1, characterized in that: The connecting layer also includes a fourth connecting layer made of copper metal, which is arranged between the second connecting layer and the copper layer. One side of the fourth connecting layer is connected to the second connecting layer, and the other side is connected to the copper layer. The thickness of the fourth connecting layer is greater than the thickness of the second connecting layer.

7. The silver-copper composite melt according to claim 6, characterized in that: The thickness of the second connecting layer is 0.1-0.2 mm.

8. The silver-copper composite melt according to claim 7, characterized in that: The thickness of the fourth connecting layer is 0.3-0.4 mm.

9. The silver-copper composite melt according to claim 8, characterized in that: The thickness of the copper layer is 8-15 mm.

10. The method for preparing a silver-copper composite melt according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, welding the first connecting layer and the second connecting layer; S2, welding the silver layer to a side of the first connecting layer away from the second connecting layer; S3. Welding the copper layer to a side of the second connection layer away from the first connection layer.

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