High-toughness diamond wire busbar and preparation method thereof

Abstract

The application relates to the field of preparation of diamond wire bus lines, in particular to a high-strength and high-toughness diamond wire bus line and a preparation method thereof. The preparation method comprises the following steps: step one: spraying mixed powder on the surface of a tungsten wire, laser alloying, and obtaining an alloyed tungsten wire; step two: placing the alloyed tungsten wire in a nickel plating solution, plating, and obtaining a nickel-plated alloyed tungsten wire; step three: placing the nickel-plated alloyed tungsten wire in a modified diamond suspension solution, adopting sanding technology, and heat treating, and obtaining a rough diamond wire bus line; and step four: repeatedly drawing the rough diamond wire bus line, using lubricants throughout the process, and finally obtaining the high-strength and high-toughness diamond wire bus line. The beneficial effect is that the strength and toughness of the diamond wire bus line are effectively improved by optimizing the processing technology, plating modified diamond, and preparing additives in the electroplating solution and the modified diamond suspension solution.

Description

Technical Field

[0001] This invention relates to the field of diamond wire busbar preparation, specifically to a high-strength and high-toughness diamond wire busbar and its preparation method. Background Technology

[0002] Diamond wire, a key material for cutting photovoltaic silicon wafers, plays a crucial role in improving cutting efficiency and reducing costs. However, it also faces a series of problems and challenges in practical applications. Reducing the wire diameter of diamond wire is an important way to improve wafer cutting efficiency and reduce silicon material loss. However, with the continuous reduction in wire diameter, the strength and wear resistance of diamond wire are challenged. High-carbon steel wire, as the traditional material for diamond wire, has a physical limit to its thinning. When the wire diameter is reduced to a certain extent, the strength and wear resistance of the diamond wire will significantly decrease, increasing the risk of wire breakage and affecting the stability of cutting and the quality of the silicon wafer. The production process of diamond wire needs further optimization to reduce costs and improve production efficiency. Simultaneously, the electroplating process of diamond wire also needs continuous improvement to ensure a strong bond between the diamond particles and the wire. Problems with the uniformity and adhesion of the plating layer during electroplating can lead to plating peeling off during use, increasing the risk of diamond wire damage. Therefore, to solve the above problems, a high-strength and high-toughness diamond wire has been prepared. Summary of the Invention

[0003] The purpose of this invention is to provide a high-strength and high-toughness diamond wire busbar and its preparation method, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] This invention optimizes the processing technology, uses modified diamond for plating, and simultaneously prepares additives in the electroplating solution and modified diamond suspension, effectively improving the strength and toughness of the diamond wire rod.

[0006] A method for preparing a high-strength and high-toughness diamond wire busbar includes the following steps:

[0007] Step 1: Spray the mixed powder onto the surface of the tungsten wire, and then perform laser alloying to obtain alloyed tungsten wire;

[0008] Step 2: Place the alloyed tungsten wire in the nickel plating solution and plate it to obtain nickel-plated alloyed tungsten wire;

[0009] Step 3: Place the nickel-plated alloyed tungsten wire in a modified diamond suspension and perform a sandblasting process followed by heat treatment to obtain a coarse diamond wire busbar.

[0010] Step 4: The thick diamond wire is pulled multiple times, with lubricant used throughout the process, to finally obtain a high-strength and high-toughness diamond wire.

[0011] In a more optimized manner: In step one, the mixed powder comprises the following components: by weight, 1-2 parts iron powder, 0.5-0.8 parts nickel powder, and 0.5-1 parts cobalt powder; the spraying process parameters are: atomizing gas pressure of 0.05-0.08 MPa, and spraying thickness of 0.3-0.5 mm; the laser alloying process parameters are: laser power of 2000-2500 W, laser cladding head linear speed of 2520-2600 mm / min, spot diameter of 2.8-3.0 mm, rotation speed of 148-160 r / min, and powder feeding rate of 30-50 g / min.

[0012] In a more optimized manner, in step two, the nickel plating solution comprises the following components: 200-220 g / L nickel sulfamate, 15-20 g / L acetic acid, 3-4 g / L nickel chloride hexahydrate, 1-2.5 g / L hydroquinone, and 1-1.5 g / L additives; the plating process parameters are: a temperature of 52-60℃ and a current density of 25-30 A / dm³. 2 The electroplating time is 15-20 seconds.

[0013] More optimized: The preparation method of the additive is as follows: (1) According to the weight, 1-2 parts of dimethylaminopropylamine and 6-8 parts of distilled water are mixed and dissolved, 1.5-3 parts of epichlorohydrin are added dropwise at 20-25℃, the reaction is carried out at 60-80℃, the pH value is adjusted with copper sulfate to make the pH value 5-7, and the intermediate is obtained by cooling; (2) According to the weight, 1-3 parts of the intermediate are added to sodium hydroxide solution, the pH value is adjusted to 8-9, heated to 80-100℃, 3-4 parts of 1-chlorononane are added dropwise, the reaction is carried out for 3-5 hours, the pH value is adjusted with copper sulfate to make the pH value 7-8, and the additive is obtained by cooling.

[0014] In a more optimized manner: In step three, the modified diamond suspension comprises the following components: 10-12 g / L modified diamond, 1-1.5 g / L additives, 35-45 g / L boric acid, 2-3 g / L sodium dodecylbenzenesulfonate, 300-320 g / L nickel sulfamate, and 20-25 g / L nickel chloride; the parameters of the sand-coating process are: temperature 50-55℃, stirring speed 350-400 rpm, and current density 15-20 A / dm³. 2 Electrodeposition for 50-55 seconds at a current density of 20-25 A / dm³ 2 Electrodeposition for 10-15 minutes; the parameters of the heat treatment are: temperature 150-200℃, time 10-25 minutes.

[0015] A more optimized method for preparing modified diamond is as follows: 15-20 parts by weight of diamond powder and 1-1.5 parts by weight of titanium powder are placed in a ball mill jar and mixed slowly at 180-200 rpm for 2-3 hours, then at a high speed of 300-350 rpm for 5-6 hours to obtain titanium diamond powder; then 15-20 parts by weight of titanium diamond powder, 0.5-1 parts by weight of copper powder, and 0.5-1 parts by weight of nickel powder are first mixed at a low speed of 180-200 rpm for 2-4 hours, then at a high speed of 300-350 rpm for 8-10 hours, followed by post-processing to obtain modified diamond powder.

[0016] In a more optimized manner, the post-treatment process parameters are: annealing temperature of 900-1000℃, holding time of 1-2h, and furnace cooling to room temperature.

[0017] In a more optimized manner, in step four, the drawing process parameters are as follows: for the first 1-3 drawing passes, the drawing speed is 5-6 m / min, the half-die angle is 5-8°, and the total pass processing rate is 20-25%; for the second 4-6 drawing passes, the drawing speed is 3-5 m / min, the half-die angle is 7-8°, and the total pass processing rate is 10-15%.

[0018] In a more optimized manner: In step four, the preparation process of the lubricant is as follows: by weight, 1-2 parts of fatty alcohol polyoxyethylene ether phosphate monoester and 1-2 parts of monoethanolamine are mixed at 50-60°C to obtain monoethanol ammonium salt, then 0.8-1 parts of diethanolamine are added to obtain diethanol ammonium salt, and finally 0.5-1 parts of triethanolamine are added to obtain the lubricant.

[0019] (1) The additives obtained act as dispersants and wetting agents in nickel plating solutions and modified diamond suspensions. The long carbon chains and hydrophilic groups in the additives increase the electrostatic repulsion between particles, prevent particle aggregation and sedimentation, and at the same time make the coating crystals fine and bright, expand the current density range, improve the dispersion and coverage of the plating solution, and make the coating of the diamond wire busbar more tightly connected, and improve its strength and toughness.

[0020] (2) Laser alloying treatment is performed on the surface of tungsten wire. By introducing iron powder, copper powder, cobalt powder and nickel powder, the strength and toughness of the diamond wire are enhanced. The introduced metals have good compatibility with nickel, making subsequent nickel electroplating easier. At the same time, compared with traditional methods, laser alloying treatment reduces material waste, refines grains, and further enhances the strength and toughness of the diamond wire.

[0021] (3) In the diamond sand coating process, modified diamond is used. First, titanium powder is used to coat the diamond, which enhances the interfacial compatibility and the roughness of the diamond surface, and enhances the deposition effect of copper powder and nickel powder. Compared with traditional diamond powder, modified diamond powder has improved interfacial compatibility due to the copper and nickel composite on the surface, making the sand coating process easier and enhancing the strength of the diamond wire.

[0022] (4) The multiple drawing process refines the grains. The lubricant used reduces the friction between the tool and the diamond wire, distributes stress more evenly, and improves the overall mechanical properties. At the same time, the lubricant used has better extreme pressure properties than traditional lubricants. It has a good cooling effect during high-speed and multiple drawing processes, preventing the material from sticking to the die wall and the grains from growing or undergoing phase transformation. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the following parts are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: diamond powder (CAS 7782-40-3, brand: Yushifa); copper powder (300 mesh, brand: Zhonghang Zhongmai); iron powder (100 mesh, brand: Zhonghang Zhongmai); titanium powder (153 mesh, brand: Zhonghang Zhongmai); nickel powder (1000 mesh, brand: Zhonghang Zhongmai); dimethylaminopropylamine (CAS 109-55-7, manufacturer: Biye Industrial Co., Ltd.); epichlorohydrin (CAS 106-89-8, manufacturer: Jubang Chemical); 1-chlorononane (CAS 2473-01-0, manufacturer: Jinjinle); and fatty alcohol polyoxyethylene ether phosphate monoester (CAS 68130-47-2, manufacturer: Chenrun Chemical).

[0025] Preparation of modified diamond:

[0026] 15 parts diamond powder and 1 part titanium powder were placed in a ball mill jar and mixed slowly at 180 rpm for 2 hours, and then at 300 rpm for 5 hours to obtain titanium diamond powder. Then, 15 parts titanium diamond powder, 0.5 parts copper powder, and 0.5 parts nickel powder were first mixed at 180 rpm for 2 hours, and then at 300 rpm for 8 hours. The resulting product was annealed in a tube furnace at 900°C, held at that temperature for 1 hour, and then cooled in the furnace to finally obtain modified diamond powder.

[0027] Preparation of additives:

[0028] (1) Add 1 part dimethylaminopropylamine and 6 parts distilled water to a reaction vessel, stir to dissolve, and add 1.5 parts epichlorohydrin dropwise at 20°C. After the addition is complete, react at 60°C until no oily substance remains, at which point the reaction is complete. Finally, adjust the pH value with copper sulfate to 5, and cool to obtain the intermediate.

[0029] (2) Place 1 part of the intermediate into a reaction vessel, add sodium hydroxide solution, adjust the pH value to 8.0, heat to 80°C, add 3 parts of 1-chlorononane dropwise, reflux for 3 hours, after the reaction is complete, distill off the excess 1-chlorononane, adjust the pH value with copper sulfate to make the pH value 7, and cool to obtain the additive.

[0030] Preparation of lubricants:

[0031] One part of fatty alcohol polyoxyethylene ether phosphate monoester was added to a reaction vessel. At 50°C, one part of monoethanolamine was added while stirring to obtain monoethanol ammonium salt. Then, 0.8 parts of diethanolamine were added to obtain diethanol ammonium salt. Finally, 0.5 parts of triethanolamine were added to obtain a lubricant.

[0032] Example 1: A method for preparing a high-strength and high-toughness diamond wire, comprising the following steps:

[0033] Step 1: Spray 1 part iron powder, 0.5 parts nickel powder, and 0.5 parts cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2000W, a laser cladding head linear speed of 2520mm / min, a spot diameter of 2.8mm, a rotation speed of 148r / min, and a powder feeding rate of 30g / min to obtain an alloyed tungsten wire.

[0034] Step 2: Mix 200 g / L nickel sulfamate, 15 g / L acetic acid, 3 g / L nickel chloride hexahydrate, 1 g / L hydroquinone, and 1 g / L additive to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 52°C, use a current density of 25 A / dm². 2 Electroplating for 15 seconds yields nickel-plated alloyed tungsten wire.

[0035] Step 3: Mix 10 g / L modified diamond, 1 g / L additive, 35 g / L boric acid, 2 g / L sodium dodecylbenzenesulfonate, 300 g / L nickel aminosulfonate, and 20 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension at 50°C, a stirring speed of 350 rpm, and a current density of 15 A / dm³. 2 Electrodeposition for 50 seconds at a current density of 20 A / dm³ 2Electrodeposition was performed for 10 minutes; finally, heat treatment was carried out at 150℃ for 10 minutes to obtain coarse diamond wire busbar.

[0036] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 5m / min, the half-die angle is 5°, and the total pass rate is 20%; the drawing speed of the fourth to sixth draws is 3m / min, the half-die angle is 7°, and the total pass rate is 10%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0037] Example 2: A method for preparing a high-strength and high-toughness diamond wire, comprising the following steps:

[0038] Step 1: Spray 2 parts iron powder, 0.8 parts nickel powder, and 1 part cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2500W, a laser cladding head linear speed of 2600mm / min, a spot diameter of 3mm, a rotation speed of 160r / min, and a powder feeding rate of 50g / min to obtain an alloyed tungsten wire.

[0039] Step 2: Mix 220 g / L nickel sulfamate, 20 g / L acetic acid, 4 g / L nickel chloride hexahydrate, 2.5 g / L hydroquinone, and 1.5 g / L additives to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 60°C, use a current density of 30 A / dm³. 2 Electroplating for 20 seconds yields nickel-plated alloyed tungsten wire.

[0040] Step 3: Mix 12 g / L modified diamond, 1.5 g / L additive, 45 g / L boric acid, 3 g / L sodium dodecylbenzenesulfonate, 320 g / L nickel aminosulfonate, and 25 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension at 55°C, a stirring speed of 400 rpm, and a current density of 20 A / dm³. 2 Electrodeposition for 55 seconds at a current density of 25 A / dm³ 2 Electrodeposition was performed for 15 minutes; finally, heat treatment was carried out at 200℃ for 25 minutes to obtain coarse diamond wire busbar.

[0041] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 25%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 15%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0042] Example 3: A method for preparing a high-strength and high-toughness diamond wire, comprising the following steps:

[0043] Step 1: Spray 1.5 parts iron powder, 0.6 parts nickel powder, and 0.6 parts cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2400W, a laser cladding head linear speed of 2530mm / min, a spot diameter of 2.9mm, a rotation speed of 150r / min, and a powder feed rate of 40g / min to obtain an alloyed tungsten wire.

[0044] Step 2: Mix 210 g / L nickel sulfamate, 16 g / L acetic acid, 3.5 g / L nickel chloride hexahydrate, 2 g / L hydroquinone, and 1.2 g / L additives to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 55°C, use a current density of 28 A / dm³. 2 Electroplating for 16 seconds yields nickel-plated alloyed tungsten wire.

[0045] Step 3: Mix 11 g / L modified diamond, 1.2 g / L additive, 42 g / L boric acid, 2.5 g / L sodium dodecylbenzenesulfonate, 310 g / L nickel aminosulfonate, and 22 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension at a temperature of 53°C, a stirring speed of 360 rpm, and a current density of 18 A / dm³. 2 Electrodeposition for 54 seconds at a current density of 23 A / dm³ 2 Electrodeposition was performed for 12 minutes; finally, heat treatment was carried out at 180℃ for 15 minutes to obtain coarse diamond wire busbar.

[0046] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 23%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 12%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0047] Comparative Example 1: Compared with Example 3, no additives were added to the nickel plating solution and diamond suspension, and the rest was the same as in Example 3, as follows:

[0048] Step 1: Spray 1.5 parts iron powder, 0.6 parts nickel powder, and 0.6 parts cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2400W, a laser cladding head linear speed of 2530mm / min, a spot diameter of 2.9mm, a rotation speed of 150r / min, and a powder feed rate of 40g / min to obtain an alloyed tungsten wire.

[0049] Step 2: Mix 210 g / L nickel sulfamate, 16 g / L acetic acid, 3.5 g / L nickel chloride hexahydrate, and 2 g / L hydroquinone to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 55°C, use a current density of 28 A / dm³. 2 Electroplating for 16 seconds yields nickel-plated alloyed tungsten wire.

[0050] Step 3: Mix 11 g / L modified diamond, 42 g / L boric acid, 2.5 g / L sodium dodecylbenzenesulfonate, 310 g / L nickel aminosulfonate, and 22 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension at a temperature of 53°C, a stirring speed of 360 rpm, and a current density of 18 A / dm³. 2 Electrodeposition for 54 seconds at a current density of 23 A / dm³ 2 Electrodeposition was performed for 12 minutes; finally, heat treatment was carried out at 180℃ for 15 minutes to obtain coarse diamond wire busbar.

[0051] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 23%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 12%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0052] Comparative Example 2: Diamond powder was used instead of modified diamond, and the rest was the same as in Example 3, as follows:

[0053] Step 1: Spray 1.5 parts iron powder, 0.6 parts nickel powder, and 0.6 parts cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2400W, a laser cladding head linear speed of 2530mm / min, a spot diameter of 2.9mm, a rotation speed of 150r / min, and a powder feed rate of 40g / min to obtain an alloyed tungsten wire.

[0054] Step 2: Mix 210 g / L nickel sulfamate, 16 g / L acetic acid, 3.5 g / L nickel chloride hexahydrate, 2 g / L hydroquinone, and 1.2 g / L additives to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 55°C, use a current density of 28 A / dm³. 2 Electroplating for 16 seconds yields nickel-plated alloyed tungsten wire.

[0055] Step 3: Mix 11 g / L diamond powder, 1.2 g / L additive, 42 g / L boric acid, 2.5 g / L sodium dodecylbenzenesulfonate, 310 g / L nickel aminosulfonate, and 22 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension, maintain a temperature of 53°C, a stirring speed of 360 rpm, and a current density of 18 A / dm³. 2 Electrodeposition for 54 seconds at a current density of 23 A / dm³ 2 Electrodeposition was performed for 12 minutes; finally, heat treatment was carried out at 180℃ for 15 minutes to obtain coarse diamond wire busbar.

[0056] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 23%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 12%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0057] Comparative Example 3: Vegetable oil was used instead of lubricant, and the rest was the same as in Example 3, as follows:

[0058] Step 1: Spray 1.5 parts iron powder, 0.6 parts nickel powder, and 0.6 parts cobalt powder onto the surface of a tungsten wire. Perform laser alloying at a laser power of 2400W, a laser cladding head linear speed of 2530mm / min, a spot diameter of 2.9mm, a rotation speed of 150r / min, and a powder feed rate of 40g / min to obtain an alloyed tungsten wire.

[0059] Step 2: Mix 210 g / L nickel sulfamate, 16 g / L acetic acid, 3.5 g / L nickel chloride hexahydrate, 2 g / L hydroquinone, and 1.2 g / L additives to obtain a nickel plating solution; place the alloyed tungsten wire in the nickel plating solution, and at 55°C, use a current density of 28 A / dm³. 2 Electroplating for 16 seconds yields nickel-plated alloyed tungsten wire.

[0060] Step 3: Mix 11 g / L modified diamond, 1.2 g / L additive, 42 g / L boric acid, 2.5 g / L sodium dodecylbenzenesulfonate, 310 g / L nickel aminosulfonate, and 22 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated alloyed tungsten wire in the diamond suspension at a temperature of 53°C, a stirring speed of 360 rpm, and a current density of 18 A / dm³. 2 Electrodeposition for 54 seconds at a current density of 23 A / dm³ 2 Electrodeposition was performed for 12 minutes; finally, heat treatment was carried out at 180℃ for 15 minutes to obtain coarse diamond wire busbar.

[0061] Step 4: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 23%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 12%. Vegetable oil is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0062] Comparative Example 4: The tungsten wire was not subjected to laser alloying treatment, but otherwise it was the same as in Example 3, as follows:

[0063] Step 1: Mix 210 g / L nickel sulfamate, 16 g / L acetic acid, 3.5 g / L nickel chloride hexahydrate, 2 g / L hydroquinone, and 1.2 g / L additives to obtain a nickel plating solution; place a tungsten wire in the nickel plating solution and apply it at 55°C with a current density of 28 A / dm³. 2 Electroplating for 16 seconds yields nickel-plated tungsten wire.

[0064] Step 2: Mix 11 g / L modified diamond, 1.2 g / L additive, 42 g / L boric acid, 2.5 g / L sodium dodecylbenzenesulfonate, 310 g / L nickel aminosulfonate, and 22 g / L nickel chloride to obtain a diamond suspension; place a nickel-plated tungsten wire in the diamond suspension, maintain the temperature at 53℃, stir at 360 rpm, and use a current density of 18 A / dm³. 2 Electrodeposition for 54 seconds at a current density of 23 A / dm³ 2 Electrodeposition was performed for 12 minutes; finally, heat treatment was carried out at 180℃ for 15 minutes to obtain coarse diamond wire busbar.

[0065] Step 3: The coarse diamond wire is drawn using a 560-type disc drawing machine, including 1-6 drawing passes. Among them, the drawing speed of the first 1-3 draws is 6m / min, the half-die angle is 8°, and the total pass rate is 23%; the drawing speed of the fourth to sixth draws is 5m / min, the half-die angle is 8°, and the total pass rate is 12%. Lubricant is used throughout the process to finally obtain a high-strength and tough diamond wire.

[0066] Testing experiments: The tensile strength of the diamond wire busbars prepared in the examples and comparative examples was tested at 25°C at a rate of 1 mm / min; the elongation was measured according to GB / T228-2002, and the elongation also reflects the toughness of the material; a slicing test was conducted on a single crystal silicon rod (diameter of 25.4 mm), and the sawing area per unit time represents the sawing efficiency. The data obtained are shown below:

[0067] Tensile strength / MPa 1850 1843 1865 1675 1678 1780 1590 Elongation / % 36.5 35.5 38.4 31.1 30.9 32.1 31.5 sawing efficiency / η 12.3 12.5 12.8 10.3 10.5 10.8 10.7

[0068] Table 1

[0069] Conclusion: The above data show that, through optimization of the processing technology, the use of modified diamond for plating, and the preparation of additives in the electroplating solution and modified diamond suspension in Examples 1-3, the strength and toughness of the diamond wire were effectively improved. In Comparative Example 1, no additives were added to the nickel plating solution and diamond suspension, and the rest was the same as in Example 3, resulting in a decrease in performance. In Comparative Example 2, diamond powder was used instead of modified diamond, and the rest was the same as in Example 3, resulting in a decrease in performance. In Comparative Example 3, vegetable oil was used instead of lubricant, and the rest was the same as in Example 3, resulting in a decrease in performance. In Comparative Example 4, the tungsten wire was not laser alloyed, and the rest was the same as in Example 3, resulting in a decrease in performance.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a high-strength and high-toughness diamond wire, characterized in that: Includes the following steps: Step 1: Spray the mixed powder onto the surface of the tungsten wire, and then perform laser alloying to obtain alloyed tungsten wire; Step 2: Place the alloyed tungsten wire in the nickel plating solution and plate it to obtain nickel-plated alloyed tungsten wire; Step 3: Place the nickel-plated alloyed tungsten wire in a modified diamond suspension and perform a sandblasting process followed by heat treatment to obtain a coarse diamond wire busbar. Step 4: The thick diamond wire is pulled multiple times, with lubricant used throughout the process, to finally obtain a high-strength and high-toughness diamond wire. The nickel plating solution comprises the following components: 200-220 g / L nickel aminosulfonate, 15-20 g / L acetic acid, 3-4 g / L nickel chloride hexahydrate, 1-2.5 g / L hydroquinone, and 1-1.5 g / L additives. The preparation method of the additive is as follows: (1) Dissolve 1-2 parts of dimethylaminopropylamine and 6-8 parts of distilled water by weight, add 1.5-3 parts of epichlorohydrin dropwise at 20-25℃, react at 60-80℃, adjust the pH to 5-7 with copper sulfate, and cool to obtain the intermediate; (2) Add 1-3 parts of the intermediate to sodium hydroxide solution by weight, adjust the pH to 8-9, heat to 80-100℃, add 3-4 parts of 1-chlorononane dropwise, react for 3-5 hours, adjust the pH to 7-8 with copper sulfate, and cool to obtain the additive.

2. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 1, characterized in that: The mixed powder comprises the following components: by weight, 1-2 parts iron powder, 0.5-0.8 parts nickel powder, and 0.5-1 parts cobalt powder; the spraying process parameters are: atomizing gas pressure of 0.05-0.08 MPa, and spraying thickness of 0.3-0.5 mm; the laser alloying process parameters are: laser power of 2000-2500 W, laser cladding head linear speed of 2520-2600 mm / min, spot diameter of 2.8-3.0 mm, rotation speed of 148-160 r / min, and powder feeding rate of 30-50 g / min.

3. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 1, characterized in that: The plating process parameters are: temperature of 52-60℃, current density of 25-30A / dm2, and plating time of 15-20s.

4. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 1, characterized in that: The modified diamond suspension comprises the following components: The composition includes 10-12 g / L modified diamond, 1-1.5 g / L additives, 35-45 g / L boric acid, 2-3 g / L sodium dodecylbenzenesulfonate, 300-320 g / L nickel sulfamate, and 20-25 g / L nickel chloride. The parameters for the sand-coating process are: temperature 50-55℃, stirring speed 350-400 rpm, current density 15-20 A / dm², electrodeposition for 50-55 s, and current density 20-25 A / dm², electrodeposition for 10-15 min. The parameters for the heat treatment are: temperature 150-200℃, time 10-25 min.

5. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 4, characterized in that: The modified diamond preparation process is as follows: by weight, 15-20 parts of diamond powder and 1-1.5 parts of titanium powder are placed in a ball mill jar and mixed slowly at 180-200 rpm for 2-3 hours, and then run at high speed of 300-350 rpm for 5-6 hours to obtain titanium diamond powder; then, 15-20 parts of titanium diamond powder, 0.5-1 parts of copper powder, and 0.5-1 parts of nickel powder are first mixed at low speed of 180-200 rpm for 2-4 hours, and then run at high speed of 300-350 rpm for 8-10 hours, followed by post-processing to obtain modified diamond powder.

6. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 5, characterized in that: The post-treatment process parameters are: annealing temperature of 900-1000℃, holding time of 1-2h, and furnace cooling to room temperature.

7. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 1, characterized in that: The drawing process parameters are as follows: for 1-3 drawing passes, the drawing speed is 5-6 m / min, the half-die angle is 5-8°, and the total pass processing rate is 20-25%; for 4-6 drawing passes, the drawing speed is 3-5 m / min, the half-die angle is 7-8°, and the total pass processing rate is 10-15%.

8. The method for preparing a high-strength and high-toughness diamond wire busbar according to claim 1, characterized in that: The lubricant is prepared by mixing 1-2 parts by weight of fatty alcohol polyoxyethylene ether phosphate monoester and 1-2 parts by weight of monoethanolamine at 50-60°C to obtain monoethanol ammonium salt. Then, 0.8-1 parts by weight of diethanolamine are added to obtain diethanol ammonium salt. Finally, 0.5-1 parts by weight of triethanolamine are added to obtain the lubricant.

9. The high-strength and high-toughness diamond wire busbar obtained by the preparation method of a high-strength and high-toughness diamond wire busbar according to any one of claims 1-8.