Glass-coated bonding copper wire and preparation method thereof

Abstract

The invention discloses a glass-coated bonding copper wire and a preparation method thereof, and belongs to the technical field of bonding wires, the glass-coated bonding copper wire contains more than 99.995 wt% of Cu, 0 ppm to 5 ppm of Ag, 0 ppm to 5 ppm of Ca, 0 ppm to 5 ppm of Mg and 0 ppm to 10 ppm of Ce, and the contents of Ag, Ca, Mg and Ce are not 0 at the same time. Through component control, the glass-coated bonding copper wire can have high elongation, proper tensile strength and oxidation resistance. The preparation method of the glass-coated bonding copper wire comprises the following steps: carrying out horizontal continuous casting on Cu, Ag, Ca, Mg and Ce in proportion, then matching with a glass piece, placing in a glass coating machine, carrying out heating, traction and rapid cooling in a protective atmosphere, and collecting a finished product of the glass-coated bonding copper wire on a bobbin. The method is easy to operate, the yield is increased, and the problems of wire breakage and the like in the preparation process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bonding wires, and in particular, to a glass-coated bonding copper wire and a preparation method thereof. Background Art

[0002] With the development of integrated circuit and semiconductor device packaging technologies towards multi-lead, high-integration, and miniaturization, packaging materials require bonding wires with finer wire diameters and better electrochemical properties. The bonding wires in the prior art are mainly divided into bonding gold wires, bonding copper wires, bonding palladium-coated copper wires, and bonding silver wires, etc.

[0003] At present, the replacement of gold wires with low-cost copper bonding wires has become increasingly mature. However, copper wires are prone to oxidation, and the preparation of copper bonding wires with a wire diameter less than 25 μm is difficult and costly, which limits their wide application in the high-end market. Preparing glass-coated metal bonding wires by the glass-coated melt spinning method can better solve the problems of easy oxidation and small size, and can also solve the insulation problem between bonding wires. However, in the existing preparation process of the glass-coated melt spinning method, there are problems such as difficulty in maintaining the continuity of the wire, poor consistency, and low yield.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a glass-coated bonding copper wire and a preparation method thereof to solve or improve the above technical problems.

[0006] The present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a glass-coated bonding copper wire, which contains more than 99.995 wt% of Cu, 0 ppm to 5 ppm of Ag, 0 ppm to 5 ppm of Ca, 0 ppm to 5 ppm of Mg, and 0 ppm to 10 ppm of Ce, and the contents of Ag, Ca, Mg, and Ce are not all 0 at the same time.

[0008] In an optional embodiment, the glass-coated bonding copper wire contains more than 99.995 wt% of Cu, 1 ppm to 5 ppm of Ag, 1 ppm to 5 ppm of Ca, 1 ppm to 5 ppm of Mg, and 5 ppm to 10 ppm of Ce.

[0009] In an optional embodiment, the diameter of the glass-coated bonding copper wire is 1 μm to 60 μm, wherein the wire diameter of the copper wire is 0.1 μm to 55 μm.

[0010] In a second aspect, the present invention provides a method for preparing a glass-coated bonded copper wire as described in the foregoing embodiments, comprising the following steps: horizontally continuous casting Cu, Ag, Ca, Mg, and Ce according to a preset ratio of metal elements to obtain a copper alloy rod; fitting the copper alloy rod with a glass part and placing them in a glass coating machine, and heating under a protective atmosphere so that the softened glass part coats the molten copper alloy rod to obtain an intermediate product; pulling out the intermediate product and performing rapid cooling, and then collecting the finished glass-coated bonded copper wire on a spool.

[0011] In an optional embodiment, the wire diameter of the copper alloy rod is 5 mm to 10 mm.

[0012] In an optional embodiment, the glass type of the glass part includes one of silicate glass, borosilicate glass, and soda-lime glass;

[0013] Preferably, the glass softening temperature of the glass part is 600 °C to 1005 °C.

[0014] In an optional embodiment, the heating temperature is 1080 °C to 1200 °C.

[0015] In an optional embodiment, the cooling method is any one of air cooling and roller cooling.

[0016] In an optional embodiment, the roller used for roller cooling is provided with a cooling pipe for circulating a refrigerant inside, so that the temperature of the roller surface is 0 °C to 100 °C.

[0017] In an optional embodiment, the surface of the roller used for roller cooling is provided with a groove for contacting the intermediate product.

[0018] In an optional embodiment, the rotation speed of the spool is 100 r / min to 400 r / min;

[0019] And / or, in the finished glass-coated bonded copper wire, the coating thickness of the glass is not less than 1 μm.

[0020] The beneficial effects of the present invention include:

[0021] By controlling the composition of the glass-coated bonded copper wire, the present invention enables it to simultaneously have a high elongation rate, appropriate breaking force, and antioxidant ability. Specifically, the glass-coated bonded copper wire contains more than 99.995 wt% of Cu, 0 ppm to 5 ppm of Ag, 0 ppm to 5 ppm of Ca, 0 ppm to 5 ppm of Mg, and 0 ppm to 10 ppm of Ce, and the contents of Ag, Ca, Mg, and Ce are not all 0 at the same time; among them, Ag can play a role in reducing the hardness of copper and improving ductility, Ca and Mg can increase the antioxidant ability of the product, and Ce can improve the antioxidant property and weldability of the product. By improving and regulating the process of the glass-coated bonded copper wire (including process flow control, selection of glass tube softening temperature, regulation of cooling roller temperature, regulation of spool speed, etc.), the product yield can be increased, and bonded copper wire with performance meeting the requirements can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the roller in the present invention;

[0024] Figure 2 It is a physical diagram of the glass-coated metal wire prepared in Example 1 of the present invention;

[0025] Figure 3 It is an SEM diagram of the glass-coated metal wire prepared in Example 1 of the present invention.

[0026] Reference numerals: 11 - roller; 12 - groove; 13 - cooling pipe; 14 - refrigerant. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments not specified for the manufacturer can all be obtained as conventional products through commercial purchase.

[0028] The glass-coated bonded copper wire provided by the present invention and its preparation method will be specifically described below.

[0029] The present invention provides a glass-coated bonded copper wire, which contains more than 99.995 wt% of Cu, 0 ppm to 5 ppm of Ag, 0 ppm to 5 ppm of Ca, 0 ppm to 5 ppm of Mg, and 0 ppm to 10 ppm of Ce, and the contents of Ag, Ca, Mg, and Ce are not all 0 at the same time.

[0030] In some alternative embodiments, the glass-coated bonded copper wire contains more than 99.995 wt% of Cu, 1 ppm to 5 ppm of Ag, 1 ppm to 5 ppm of Ca, 1 ppm to 5 ppm of Mg, and 5 ppm to 10 ppm of Ce.

[0031] Among them, the content of Cu can be 99.995 wt%, 99.996 wt%, 99.997 wt%, 99.998 wt%, or 99.999 wt%, etc., or other contents above 99.995 wt%.

[0032] The content of Ag can be 1 ppm, 1.5 ppm, 2 ppm, 2.5 ppm, 3 ppm, 3.5 ppm, 4 ppm, 4.5 ppm, or 5 ppm, etc., or other values within the range of 1 ppm to 5 ppm.

[0033] The content of Ca can be 1 ppm, 1.5 ppm, 2 ppm, 2.5 ppm, 3 ppm, 3.5 ppm, 4 ppm, 4.5 ppm, or 5 ppm, etc., or other values within the range of 1 ppm to 5 ppm.

[0034] The content of Mg can be 1 ppm, 1.5 ppm, 2 ppm, 2.5 ppm, 3 ppm, 3.5 ppm, 4 ppm, 4.5 ppm, or 5 ppm, etc., or other values within the range of 1 ppm to 5 ppm.

[0035] The content of Ce can be 5 ppm, 5.5 ppm, 6 ppm, 6.5 ppm, 7 ppm, 7.5 ppm, 8 ppm, 8.5 ppm, 9 ppm, 9.5 ppm, or 10 ppm, etc., or other values within the range of 5 ppm to 10 ppm.

[0036] It should be noted that different contents and types of trace elements in the glass-coated bonded copper wire will result in different mechanical properties (such as elongation, breaking force, etc.) and antioxidant ability of the glass-coated bonded copper wire. In the present invention, Ag can play a role in reducing the hardness of copper and improving ductility. However, if the content of Ag is higher than 5 ppm, the strength of copper will be reduced and it is easy to break; Ca and Mg can increase the antioxidant ability of the product. However, if the content of Ca is higher than 5 ppm, the conductivity will decrease. If the content of Mg is higher than 5 ppm, the conductivity will also decrease; Ce can improve the antioxidant property and weldability of the product and enhance the arc-forming characteristics of the copper wire. However, if the content of Ce is higher than 10 ppm, the strength of copper will be increased and it is not easy to break.

[0037] Continuing from the above, the present invention controls the composition of the glass-coated bonded copper wire so that it can simultaneously have a high elongation, appropriate breaking force and antioxidant ability.

[0038] In some alternative embodiments, the diameter of the glass-coated bonded copper wire can be 1 μm to 60 μm, such as 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm or 60 μm, etc., or other values within the range of 1 μm to 60 μm. Among them, the wire diameter of the copper wire can be 0.1 μm to 55 μm, such as 0.1 μm, 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm or 55 μm, etc., or other values within the range of 0.1 μm to 55 μm. In some relatively typical embodiments, the wire diameter of the copper wire does not exceed 25 μm, such as 10 μm to 25 μm.

[0039] Correspondingly, the present invention also provides a method for preparing the above glass-coated bonded copper wire, including the following steps: horizontally continuous casting Cu, Ag, Ca, Mg and Ce according to a preset ratio of metal elements to obtain a copper alloy rod; matching the copper alloy rod with a glass part and placing them in a glass coating machine, and heating under a protective atmosphere so that the softened glass part coats the molten copper alloy rod to obtain an intermediate product; pulling out the intermediate product and performing rapid cooling, and then collecting the finished product of the glass-coated bonded copper wire on a spool.

[0040] In some alternative embodiments, the wire diameter of the copper alloy rod can be 5 mm to 10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc., or other values within the range of 5 mm to 10 mm.

[0041] In some alternative embodiments, the above glass part can be a glass tube with a closed lower end (to prevent the molten metal liquid from flowing out). The glass type of the glass part can include one of silicate glass, borosilicate glass and soda-lime glass.

[0042] Preferably, the glass softening temperature of the glass piece may be 600° C. to 1005° C., such as 600° C., 650° C., 700° C., 750° C., 800° C., 850° C., 900° C., 950° C., 1000° C. or 1005° C., etc., or other values ​​within the range of 600° C. to 1005° C. In some typical embodiments, the glass softening temperature of the glass piece is 725° C. to 935° C.

[0043] If the softening temperature of the glass part is lower than 600℃, the finished product cannot be obtained; if the softening temperature of the glass part is higher than 1005℃, it is not conducive to wire drawing. If the softening temperature is too high, the metal will melt, and the glass will not soften and wire drawing cannot be performed.

[0044] By adopting glass parts with the above-mentioned glass softening temperature, the yield rate of the product can be improved.

[0045] In some optional embodiments, the protective atmosphere may be an argon atmosphere or a nitrogen atmosphere.

[0046] In some optional embodiments, the heating temperature may be 1080° C. to 1200° C., such as 1080° C., 1100° C., 1150° C. or 1200° C., or other values ​​within the range of 1080° C. to 1200° C. Exemplarily, a high frequency induction coil may be used for the heating process.

[0047] In some optional embodiments, the cooling method is any one of air cooling and roller cooling.

[0048] Among them, Figure 1 As shown, the roller 11 used for roller cooling may be provided with a cooling pipe 13 for circulating a refrigerant 14 (such as a coolant) inside, so that the temperature of the surface of the roller 11 is 0°C to 100°C, such as 0°C, 5°C, 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C or 100°C, or other values ​​within the range of 0°C to 100°C. In some typical embodiments, the temperature of the surface of the roller 11 is 25°C to 60°C.

[0049] It is difficult to achieve rapid coagulation during the existing glass-coated metal wire melt forming process. The present invention specifically adds a rapid cooling method during the wire drawing process and controls the temperature of the roller 11 surface at 0°C to 100°C, which can achieve rapid coagulation and avoid the problem of wire breakage during the preparation process.

[0050] In addition, the surface of the roller 11 used for roller cooling can be provided with a groove 12 for contacting the intermediate product. The provision of the above groove 12 can play a role in increasing the contact area and limiting, which is conducive to improving the consistency of the copper wire diameter size.

[0051] In some alternative embodiments, the rotational speed of the spool can be 100 r / min to 400 r / min, such as 100 r / min, 150 r / min, 200 r / min, 250 r / min, 300 r / min, 350 r / min or 400 r / min, etc., or other values within the range of 100 r / min to 400 r / min.

[0052] If the rotational speed of the spool is lower than 100 r / min, the wire diameter is too thick and wire formation cannot be achieved; if the rotational speed of the spool is higher than 400 r / min, it is not conducive to too thin wire diameter and the wire drawing process is prone to breakage.

[0053] In some alternative embodiments, in the finished glass-coated bonded copper wire, the coating thickness of the glass is not less than 1 μm.

[0054] Continuing from the above, the equipment used in the preparation method of the glass-coated bonded copper wire provided by the present invention is simple, the manufacturing process is short, and the manufacturing cost is low. Through the improvement and regulation of the process (including process flow control, selection of glass tube softening temperature, regulation of cooling roller temperature, regulation of spool speed, etc.), the product yield can be improved, and bonded copper wire with required performance can be obtained.

[0055] The features and properties of the present invention will be further described in detail below in conjunction with embodiments.

[0056] Example 1

[0057] This example provides a glass-coated bonded copper wire (as shown in Figure 2 and Figure 3 ), and its preparation method is as follows:

[0058] S1: Cu (purity ≥ 99.999%), Ag, Ca, Mg and Ce are horizontally continuously cast according to a preset ratio of metal elements to obtain a copper alloy rod.

[0059] Among them, the preset ratio is: the glass-coated bonded copper wire contains 3 ppm of Ag, 1 ppm of Ca, 5 ppm of Mg and 10 ppm of Ce, and the balance is copper and unavoidable impurities. The wire diameter of the copper alloy rod is 5 mm.

[0060] S2: The copper alloy rod is combined with a glass part and placed in a glass coating machine, and heated under a protective atmosphere so that the softened glass part coats the molten copper alloy rod to obtain an intermediate product.

[0061] Among them, the protective atmosphere is an argon atmosphere, the heating temperature is 1090 °C, and the glass softening temperature of the glass part is 825 °C.

[0062] S3: The intermediate product is drawn out and rapidly cooled, and then the finished glass-coated bonded copper wire is collected on a spool.

[0063] The above cooling method is the roller cooling method. Among them, Figure 1 , a cooling pipe 13 is provided inside the roller 11, and a coolant flows through the cooling pipe 13, so that the temperature on the surface of the roller 11 is maintained at 40 °C. A groove 12 for contacting the glass-coated bonded copper wire is provided on the surface of the roller 11. The rotation speed of the above spool is 300 r / min.

[0064] The diameter of the glass-coated bonded copper wire is about 25 μm, and among them, the wire diameter of the copper wire is about 22 μm.

[0065] Example 2

[0066] This example provides a glass-coated bonded copper wire, and its preparation method is as follows:

[0067] S1: Cu (purity ≥ 99.999%), Ag, Ca, Mg, and Ce are horizontally continuously cast according to a preset ratio of metal elements to obtain a copper alloy rod.

[0068] Among them, the preset ratio is: the glass-coated bonded copper wire contains 3 ppm of Ag, 1 ppm of Ca, 3 ppm of Mg, and 8 ppm of Ce, and the balance is copper and unavoidable impurities. The wire diameter of the copper alloy rod is 8 mm.

[0069] S2: The copper alloy rod and the glass part are combined and placed in a glass coating machine, and heated under a protective atmosphere so that the softened glass part coats the molten copper alloy rod to obtain an intermediate product.

[0070] Among them, the protective atmosphere is an argon atmosphere, the heating temperature is 1090 °C, and the glass softening temperature is 800 °C.

[0071] S3: The intermediate product is drawn out and rapidly cooled, and then the finished product of the glass-coated bonded copper wire is collected on a spool.

[0072] The above cooling method is the roller cooling method. Among them, a cooling pipe 13 is provided inside the roller 11, and a coolant flows through the cooling pipe 13, so that the temperature on the surface of the roller 11 is maintained at 0 °C. A groove 12 for contacting the glass-coated bonded copper wire is provided on the surface of the roller 11. The rotation speed of the above spool is 100 r / min.

[0073] The diameter of the glass-coated bonded copper wire is about 60 μm, and among them, the wire diameter of the copper wire is about 55 μm.

[0074] Example 3

[0075] This example provides a glass-coated bonded copper wire, and its preparation method is as follows:

[0076] S1: Horizontally continuously cast Cu (purity ≥ 99.999%), Ag, Ca, Mg, and Ce according to a preset ratio of metal elements to obtain a copper alloy rod.

[0077] Among them, the preset ratio is that the glass-coated bonded copper wire contains 5 ppm of Ag, 5 ppm of Ca, 5 ppm of Mg, and 10 ppm of Ce, and the balance is copper and inevitable impurities. The wire diameter of the copper alloy rod is 10 mm.

[0078] S2: Fit the copper alloy rod with a glass piece and place it in a glass coating machine, and heat it under a protective atmosphere so that the softened glass piece coats the molten copper alloy rod to obtain an intermediate product.

[0079] Among them, the protective atmosphere is a nitrogen atmosphere, the heating temperature is 1100 °C, and the glass softening temperature is 900 °C.

[0080] S3: Pull out the intermediate product and perform rapid cooling, and then collect the finished glass-coated bonded copper wire on a spool.

[0081] The above cooling method is a roller cooling method. Among them, a cooling pipeline 13 is provided inside the roller 11, and a coolant flows through the cooling pipeline 13 so that the temperature on the surface of the roller 11 is maintained at 100 °C. A groove 12 for contacting the glass-coated bonded copper wire is provided on the surface of the roller 11. The rotation speed of the above spool is 400 r / min.

[0082] The diameter of the glass-coated bonded copper wire is about 15 μm, among which the wire diameter of the copper wire is about 7 μm.

[0083] Example 4

[0084] The difference between this example and Example 1 is that the cooling method is an air cooling method.

[0085] Test Example 1

[0086] Perform mechanical property tests on the glass-coated bonded copper wires prepared in Examples 1 to 4, and the results are shown in Table 1. Among them, the breaking force is tested according to GB-T228.1-2021, and the elongation rate is tested according to GB-T228.1-2021.

[0087] Table 1 Mechanical property results

[0088] Wire diameter (μm) Breaking load (BL) Elongation (EL) Yield (%) Example 1 22 7.0 cN 12.1％ 94.5 Example 2 55 10.2 cN 8.2％ 70.3 Example 3 7 4.0 cN 7.5％ 70.1 Example 4 22 6.0 cN 8.1％ 60.5

[0089] It can be seen from Table 1 that the glass-coated bonded copper wires prepared in Examples 1 to 4 of the present invention can obtain appropriate mechanical properties and a high yield under the respective corresponding wire diameters above.

[0090] Test Example 2

[0091] According to the preparation process of Example 1, in this test example, on the premise that other conditions are the same, the effects of glasses with different glass softening temperatures on the yield, breaking force, and elongation are studied, and the results are shown in Table 2. The scheme corresponding to Glass 4 in Table 2 is the scheme of Example 1.

[0092] Table 2 Comparison Table

[0093]

[0094]

[0095] As can be seen from Table 2, different glass softening temperatures will affect the yield, breaking force, and elongation of the product. When the glass softening temperature is lower than 600 °C, no finished product can be obtained, and the corresponding yield is 0%; when the glass softening temperature is in the range of 725 °C to 935 °C, the corresponding yield is relatively high, and both the breaking force and elongation are more appropriate.

[0096] Test Example 3

[0097] According to the preparation process of Example 1, in this test example, on the premise that other conditions are the same, the effects of different roller surface temperatures on the yield, breaking force, and elongation are studied, and the results are shown in Table 3.

[0098] Table 3 Comparison Table

[0099] Roller surface temperature (°C) Yield Breaking load (BL) Elongation (EL) 0 50％ 8.0 cN 10.1％ 25 70％ 7.8 cN 11.2％ 40 94.5％ 7.0 cN 12.1％ 60 70％ 7.1 cN 15.3％ 80 50％ 6.9 cN 16.0％ 100 30％ 5.2 cN 10.7％ 110 0 - -

[0100] As can be seen from Table 3, different roller surface temperatures will affect the yield, breaking force, and elongation of the product. When the roller surface temperature is in the range of 25 °C to 60 °C, the corresponding yield is relatively high, and the breaking force and elongation are also more appropriate; when the roller surface temperature exceeds 100 °C, such as reaching 110 °C, the yield of the product is 0.

[0101] Test Example 4

[0102] According to the preparation process of Example 1, in this test example, on the premise that other conditions are the same, the effects of different spool speeds on the copper wire diameter are studied, and the results are shown in Table 4.

[0103] Table 4 Comparison Table

[0104]

[0105]

[0106] As can be seen from Table 4, different spool speeds will affect the copper wire diameter. As the spool speed increases, the corresponding copper wire diameter decreases.

[0107] As mentioned above, it can be seen from Tables 2 to 4 that through the improvement and regulation of the process, including the selection of the softening temperature of the glass tube, the regulation of the cooling roller temperature and the regulation of the wire spool speed, a bonding copper wire with a high yield and performance that meets the requirements can be produced.

[0108] Test Example 5

[0109] According to the preparation process of Example 1, this test example studies the influence of different composition and wire diameter of glass-coated bonding copper wire on the mechanical properties of the product under the premise that other conditions are the same. The results are shown in Table 5.

[0110] Table 5 Comparison table

[0111]

[0112]

[0113] It can be seen from Table 5 that the differences in component composition and copper wire diameter will affect the mechanical properties of the product; if the component composition is inappropriate, it is impossible to obtain a product that meets the mechanical property requirements.

[0114] It should be noted that the mechanical properties of glass-coated bonding copper wire need to match its specific wire diameter. Different wire diameters are suitable for different ranges of mechanical properties, and it is necessary to ensure that they are within a reasonable range, otherwise the breaking force will be too small, which will lead to premature breaking, while the breaking force will be too large to break. Therefore, it is necessary to consider the composition and wire diameter. Under the same wire diameter, the glass-coated bonding copper wire with a composition of "more than 99.995wt% Cu, 0ppm~5ppm Ag, 0ppm~5ppm Ca, 0ppm~5ppm Mg and 0ppm~10ppm Ce, and the contents of Ag, Ca, Mg and Ce are not all 0" has the best effect.

[0115] In summary, the present invention can make the glass-coated bonding copper wire have high elongation, appropriate breaking force and anti-oxidation ability by controlling the composition of the glass-coated bonding copper wire. By improving and regulating the preparation process of the glass-coated bonding copper wire, including the selection of the softening temperature of the glass tube, the regulation of the temperature of the cooling roller and the regulation of the wire shaft speed, a bonding copper wire with a high copper wire yield rate and performance that meets the requirements can be prepared. The method is simple to operate, is conducive to improving the yield rate, and reduces problems such as wire breakage during the preparation process.

[0116] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A glass-coated bonding copper wire, characterized in that: The glass-coated bonding copper wire contains more than 99.995 wt % of Cu, 0 ppm to 5 ppm of Ag, 0 ppm to 5 ppm of Ca, 0 ppm to 5 ppm of Mg and 0 ppm to 10 ppm of Ce, and the contents of Ag, Ca, Mg and Ce are not all 0 at the same time; Preferably, the glass-coated bonding copper wire contains more than 99.995 wt % of Cu, 1 ppm to 5 ppm of Ag, 1 ppm to 5 ppm of Ca, 1 ppm to 5 ppm of Mg and 5 ppm to 10 ppm of Ce.

2. The glass-coated bonding copper wire according to claim 1, characterized in that: The diameter of the glass-coated bonding copper wire is 1 μm to 60 μm, wherein the wire diameter of the copper wire is 0.1 μm to 55 μm.

3. A method for preparing a glass-coated bonding copper wire as claimed in claim 1 or 2, characterized in that: The method comprises the following steps: horizontally continuously casting Cu, Ag, Ca, Mg and Ce according to a preset ratio of metal elements to obtain a copper alloy rod; matching the copper alloy rod with a glass piece and placing the copper alloy rod in a glass coating machine, heating the copper alloy rod in a protective atmosphere so that the softened glass piece coats the molten copper alloy rod to obtain an intermediate product; pulling out the intermediate product and rapidly cooling it, and then collecting the finished glass-coated bonding copper wire on a spool.

4. The preparation method according to claim 3, characterized in that: The wire diameter of the copper alloy rod is 5 mm to 10 mm.

5. The preparation method according to claim 3, characterized in that: The glass type of the glass piece includes one of silicate glass, borosilicate glass and soda-lime glass; Preferably, the glass softening temperature of the glass piece is 600°C to 1005°C.

6. The preparation method according to claim 4, characterized in that: The heating temperature is 1080℃~1200℃.

7. The preparation method according to claim 4, characterized in that: The cooling method is either air cooling or roller cooling.

8. The preparation method according to claim 7, characterized in that: The roller used for roller cooling is provided with a cooling pipe for circulating a refrigerant inside the roller so that the temperature of the roller surface is 0°C to 100°C.

9. The preparation method according to claim 7, characterized in that: The surface of the rollers used for roller cooling is provided with grooves for contact with the intermediate product.

10. The preparation method according to claim 4, characterized in that: The rotation speed of the spool is 100r / min~400r / min; And / or, in the finished glass-coated bonding copper wire product, the glass coating thickness is not less than 1 μm.

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