Semi-plated carborundum, preparation method thereof and diamond wire

Abstract

The invention discloses semi-plated carborundum, a preparation method of the semi-plated carborundum and a diamond wire, and relates to the technical field of diamond wires. The preparation method comprises the following steps: carrying out ultrasonic water washing treatment on plated carborundum; mixing the plated carborundum subjected to the ultrasonic water washing treatment with pure water to obtain a mixture of the plated carborundum and the pure water; the mixture of the plated carborundum and the pure water is stirred, a nitric acid solution is added in the stirring process, and the surface metal layer of the plated carborundum is corroded through the nitric acid solution; and the corroded plated carborundum is cleaned and dried, and the semi-plated carborundum is obtained. According to the method, the semi-plated carborundum is obtained by corroding the surface metal layer plated with carborundum, the probability that the semi-plated carborundum touches a diamond wire bus in the electroplating process is higher, the probability that the semi-plated carborundum is captured by a plating layer is higher, and the diamond wire produced by using the semi-plated carborundum is better in uniformity and dispersity.

Description

Technical Field

[0001] The invention belongs to the technical field of diamond wires, and in particular relates to semi-coated diamond sand and a preparation method thereof, and a diamond wire. Background Art

[0002] Diamond wire is a wire cutting tool that uses the electrodeposition method to fix diamond abrasives on the substrate. Compared with traditional slurry cutting, its cutting efficiency and surface quality are further optimized. Nowadays, electroplated diamond wire is also widely used in the cutting of non-metallic super-hard and brittle materials such as crystal, sapphire and magnetic materials.

[0003] At present, there are two main types of diamond abrasives commonly used, namely, bare sand and nickel-plated sand. Bare sand refers to diamond micropowder without metal coating on the surface, which is directly used for sanding. The advantage of this type of diamond wire is that the diamond micropowder does not agglomerate and does not require sharpening for cutting. The disadvantage is that because the diamond micropowder is not conductive, it only has a physical embedding effect with the substrate coating, and is easy to fall off during subsequent cutting, reducing the utilization rate of the diamond micropowder.

[0004] Nickel plating refers to coating the surface of diamond powder with a layer of metal, such as nickel, to make its surface conductive, which is conducive to directional movement during the electroplating process and strengthens the chemical bond consolidation between the particles and the coating. However, the diamond wire prepared by this method has the following problems: 1) Diamond powder is prone to agglomeration during the electroplating process. When the diamond powder agglomerates and deposits on the surface of the substrate, it not only increases the wire diameter of the diamond wire, but also easily causes wire marks on the cut objects during the cutting process; 2) Due to the tip effect of the diamond powder on the diamond wire, the coating on its surface is thicker. For products with thicker wire diameters, sharpening is required. In addition, the coating on the top of the diamond powder is easily worn off during use and falls into the cutting fluid, which reduces the cutting efficiency of the diamond wire to a certain extent. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a semi-coated diamond sand and a preparation method thereof, and a diamond wire. The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0006] The present invention provides a method for preparing semi-coated corundum, comprising:

[0007] The plated corundum is subjected to ultrasonic water washing treatment;

[0008] Mixing the plated corundum after ultrasonic washing with pure water to obtain a mixture of plated corundum and pure water;

[0009] Stirring the mixture of the plated corundum and pure water, adding nitric acid solution during the stirring process, and corroding the surface metal layer of the plated corundum with the nitric acid solution;

[0010] The corroded plated corundum is cleaned and dried to obtain the semi-plated corundum.

[0011] In one embodiment of the present invention, the particle size of the plated corundum is 6-40 μm.

[0012] In one embodiment of the present invention, the ultrasonic water washing treatment is performed for 1-5 minutes.

[0013] In one embodiment of the present invention, the mass ratio of the plated corundum to the pure water in the mixture of the plated corundum and pure water after ultrasonic washing is 5:6.

[0014] In one embodiment of the present invention, the mass concentration of nitric acid in the nitric acid solution and the mixture of the plated corundum and pure water is 10%-20%.

[0015] In one embodiment of the present invention, the stirring treatment time is 2-10 minutes.

[0016] In one embodiment of the present invention, the temperature of the drying process is 30-80°C.

[0017] In one embodiment of the present invention, the coverage area of ​​the surface metal layer in the semi-coated corundum is 30-70% of the surface area of ​​the corundum.

[0018] The present invention also provides a semi-coated corundum, which is prepared by the method for preparing the semi-coated corundum described in any one of the above embodiments.

[0019] The present invention further provides a diamond wire, comprising a diamond wire busbar and an inlay layer arranged on the surface of the diamond wire busbar, wherein the inlay layer is embedded with semi-coated corundum as described in the above embodiment, wherein, in the semi-coated corundum of the inlay layer, the number of the semi-coated corundum with a side not coated with a metal layer facing away from the surface of the diamond wire busbar accounts for not less than 50%.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The preparation method of the semi-coated corundum of the present invention comprises the following steps: firstly, the plated corundum is subjected to ultrasonic water washing treatment; then, the plated corundum subjected to ultrasonic water washing treatment is mixed with pure water to obtain a mixture of plated corundum and pure water; then, the mixture of plated corundum and pure water is stirred, and a nitric acid solution is added during the stirring process, and the surface metal layer of the plated corundum is corroded by the nitric acid solution; finally, the corroded plated corundum is cleaned and dried to obtain semi-coated corundum. The method of the present invention obtains semi-coated corundum by corroding the surface metal layer of the plated corundum. During the electroplating process, the part of the semi-coated corundum with the metal layer is conductive, and the part without the metal layer is non-conductive. Compared with bare sand, the surface state of the semi-coated corundum makes it move toward the cathode under the action of the electric field, which increases the probability of the semi-coated corundum touching the diamond wire busbar and improves the probability of the semi-coated corundum being captured by the coating. Compared with plated corundum, semi-plated corundum reduces the agglomeration of semi-plated corundum due to its special surface state, and the diamond wire produced by semi-plated corundum has better uniform dispersion.

[0022] 2. The semi-coated corundum of the present invention has a partial surface coated with a metal layer and a partial surface not coated with a metal layer. Since the portion without a metal layer is not conductive, in the electrochemical process of preparing diamond wire using the semi-coated corundum, nickel is mainly deposited on the surface of the diamond mother bar and grows at the junction of the semi-coated corundum and the coating, which greatly increases the holding force of the coating on the semi-coated corundum, thereby improving the cutting performance of the diamond wire.

[0023] 3. The diamond wire of the present invention has semi-coated corundum embedded in the inlay layer arranged on the surface of the diamond wire mother bar, and the side without the metal layer is facing away from the surface of the diamond wire mother bar. Therefore, when the diamond wire is cut, the probability of the metal layer falling into the cutting fluid is greatly reduced, thereby improving the cutting efficiency of the diamond wire.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a method for preparing semi-coated corundum provided by an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of bare sand, coated corundum and semi-coated corundum provided by an embodiment of the present invention;

[0027] Figure 3 This is an electron microscope image of bare sand provided by an embodiment of the present invention;

[0028] Figure 4 This is an electron microscope image of a coated corundum provided by an embodiment of the present invention;

[0029] Figure 5 This is an electron microscope image of a semi-coated corundum provided by an embodiment of the present invention;

[0030] Figure 6 This is an electron microscope image of a diamond wire prepared by coating diamond sand provided by an embodiment of the present invention;

[0031] Figure 7 This is an electron microscope image of a diamond wire prepared by semi-coated corundum provided in an embodiment of the present invention.

[0032] Reference numerals

[0033] 10-bare sand; 20-plated corundum; 30-semi-plated corundum; 1-diamond particles; 2-metal nickel layer. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of a semi-coated corundum and its preparation method and diamond wire proposed according to the present invention in combination with the accompanying drawings and specific implementation methods.

[0035] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of the specific implementation modes in conjunction with the accompanying drawings. Through the description of the specific implementation modes, the technical means and effects adopted by the present invention to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation purposes and are not used to limit the technical solutions of the present invention.

[0036] In the first aspect, the present invention provides a method for preparing semi-coated corundum, see Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a method for preparing semi-coated corundum provided by an embodiment of the present invention. Figure 1 As shown, the method for preparing the semi-coated corundum of this embodiment comprises the following steps:

[0037] Step 1: ultrasonically washing the plated corundum;

[0038] Step 2: mixing the plated corundum after ultrasonic washing with pure water to obtain a mixture of plated corundum and pure water;

[0039] Step 3: stirring the mixture of the plated corundum and pure water, adding nitric acid solution during the stirring process, and using the nitric acid solution to corrode the surface metal layer of the plated corundum;

[0040] Step 4: Clean and dry the corroded plated corundum to obtain semi-plated corundum.

[0041] In this embodiment, the coated corundum is diamond powder with a metal layer on the surface, and the metal layer can be a nickel layer. The coverage area of ​​the surface metal layer in the prepared semi-coated corundum is 30-70% of the surface area of ​​the corundum.

[0042] See also Figure 2 , Figure 2 Schematic diagram of bare sand, coated corundum and semi-coated corundum provided by an embodiment of the present invention, bare sand 10, i.e., the surface of diamond particles 1 is not coated with a metal nickel layer 2, coated corundum 20, i.e., the surface of diamond particles 1 is fully coated with a metal nickel layer 2, and semi-coated corundum 30, i.e., the surface of diamond particles 1 is partially coated with a metal nickel layer 2 and partially not coated with a metal nickel layer 2. It should be noted that the shape of the diamond particles 1 is an irregular polygon, Figure 2 The diamond particles 1 shown are only schematic diagrams and are not intended to limit the shape of the diamond particles 1 .

[0043] In an optional embodiment, step 1 includes: using pure water to perform ultrasonic water washing on the plated corundum for 1-5 minutes. Preferably, the ultrasonic washing time can be any selected value of 1 minute, 2 minutes, 3 minutes, 4 minutes, or 5 minutes.

[0044] Optionally, the particle size of the plated corundum is 6-40 μm. Preferably, it can be any selected value of 6 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, or 40 μm.

[0045] In this embodiment, the plated corundum is ultrasonically washed with pure water, and the cavitation effect of the ultrasound on the metal surface can form defects inside and on the surface of the plated corundum, and the defects can provide corrosion sites for subsequent corrosion treatment.

[0046] In an optional embodiment, in step 2, the mass ratio of the plated corundum to the pure water in the mixture of the plated corundum and the pure water after ultrasonic washing is 5:6.

[0047] For example, 100 g of plated corundum after ultrasonic water washing treatment can be added into 120 mL of pure water for mixing to obtain a mixture of plated corundum and pure water.

[0048] In an optional embodiment, the mass concentration of nitric acid in the nitric acid solution and the mixture of the coated corundum and pure water is 10%-20%. The stirring treatment time is 2-10 minutes. Preferably, the stirring treatment time can be any selected value of 2 minutes, 5 minutes, 8 minutes, and 10 minutes.

[0049] Optionally, step 3 may specifically include: stirring the mixture of plated corundum and pure water, and gradually adding nitric acid solution during the stirring process. Generally speaking, the purity of the purchased nitric acid solution is not 100%, and illustratively, it may be 65-68%. Therefore, it can be calculated based on the mass of the prepared corundum and the purity of the nitric acid solution, so that the mass concentration of nitric acid in the final nitric acid solution and the mixture of plated corundum and pure water accounts for 10%-20%. Preferably, it can be any selected value of 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%. Continue stirring for 2-10 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0050] In this embodiment, the interior and surface of the plated corundum after ultrasonic water washing treatment have multiple defects. The corrosion sites formed by these defects make the plated corundum more susceptible to react with nitric acid solution, that is, the metal layer on the surface of the plated corundum, namely the nickel layer, begins to dissolve from the corrosion sites.

[0051] In this embodiment, the nitric acid solution is selected to corrode the surface metal layer plated with corundum because nickel metal is more likely to react with the nitric acid solution and be corroded by the nitric acid solution.

[0052] It is understandable that the corrosion and dissolution of the nickel layer on the surface of the plated corundum does not happen overnight. During the corrosion reaction between the nickel layer and the nitric acid solution, a passivation film will gradually form on the surface of the diamond particles during the dissolution process. This passivation film can prevent the nitric acid solution from further corroding the nickel layer on the surface of the plated corundum, thereby enabling the corundum to reach a semi-coated and semi-bare sand state.

[0053] In an optional embodiment, in step 4, the temperature of the drying treatment is 30-80°C.

[0054] Optionally, step 4 may specifically include: washing the corroded plated corundum with pure water, and drying it in an oven at 30-80° C. to obtain semi-plated corundum. Preferably, the temperature may be any selected value of 30° C., 40° C., 50° C., 60° C., 70° C., or 80° C.

[0055] It should be noted that the corrosion of nitric acid solution will weaken the bonding strength of the uncorroded metal layer on the surface of the diamond particles. Therefore, the corroded plated diamond sand needs to be cleaned and then dried. The uncorroded metal layer on the surface of the diamond particles after drying is more stable and more stable in the subsequent sanding process.

[0056] The method for preparing the semi-coated corundum of the embodiment of the present invention is to obtain the semi-coated corundum by corroding the surface metal layer of the plated corundum. During the electroplating process, the part of the semi-coated corundum with the metal layer is conductive, and the part without the metal layer is non-conductive. Compared with bare sand, the surface state of the semi-coated corundum makes it move toward the cathode under the action of the electric field, which increases the probability of the semi-coated corundum touching the diamond wire busbar and improves the probability of the semi-coated corundum being captured by the coating. Compared with plated corundum, the semi-coated corundum reduces the phenomenon of agglomeration of the semi-coated corundum due to its special surface state, and the diamond wire produced using the semi-coated corundum has better uniform dispersion.

[0057] Furthermore, the technical solution of the present invention will be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Example 1

[0059] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 6 μm.

[0060] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0061] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 10%, continue stirring for 2 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0062] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 80°C for drying to obtain semi-nickel-plated corundum.

[0063] Example 2

[0064] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 6 μm.

[0065] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0066] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 16%, continue stirring for 5 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0067] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 80°C for drying to obtain semi-nickel-plated corundum.

[0068] Example 3

[0069] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 6 μm.

[0070] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0071] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 20%, and continue stirring for 10 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0072] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 80°C for drying to obtain semi-nickel-plated corundum.

[0073] Example 4

[0074] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 15 μm.

[0075] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0076] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 10%, continue stirring for 5 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0077] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0078] Example 5

[0079] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 15 μm.

[0080] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0081] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 16%, and continue stirring for 10 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0082] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0083] Example 6

[0084] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 15 μm.

[0085] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0086] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 20%, continue stirring for 2 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0087] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0088] Example 7

[0089] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 35 μm.

[0090] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0091] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 10%, continue stirring for 10 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0092] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0093] Example 8

[0094] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 35 μm.

[0095] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0096] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 16%, continue stirring for 2 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0097] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0098] Example 9

[0099] Step 1: Use pure water to perform ultrasonic water washing for 5 minutes on nickel-plated corundum with a particle size of 35 μm.

[0100] Step 2: Add 100 g of nickel-plated corundum after ultrasonic water washing into 120 mL of pure water and mix them to obtain a mixture of nickel-plated corundum and pure water.

[0101] Step 3: Stir the mixture of nickel-plated corundum and pure water, and add nitric acid solution during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of plated corundum and pure water is 20%, and continue stirring for 5 minutes, and use the nitric acid solution to corrode the surface metal layer of the plated corundum.

[0102] Step 4: Use pure water to clean the corroded nickel-plated corundum. After cleaning, place it in an oven at 50°C for drying to obtain semi-nickel-plated corundum.

[0103] The corrosion conditions of the surface metal layer of the semi-nickel-plated corundum obtained in Examples 1-9 were observed and compared. The comparison results are shown in Table 1.

[0104] Table 1

[0105]

[0106] It can be seen from Table 1 that for nickel-plated corundum with a particle size of 35 μm, nitric acid solution is added during the stirring process, wherein the mass concentration of nitric acid in the total of the nitric acid solution and the mixture of the plated corundum and pure water is 16%, and when the corrosion time is 2 minutes, the corrosion area of ​​the semi-nickel-plated corundum reaches half, and the corrosion effect is the best.

[0107] The morphologies of bare sand, nickel-plated corundum and semi-nickel-plated corundum prepared in Example 8 were observed using a scanning electron microscope. Figure 3-Figure 5 , Figure 3 This is an electron microscope image of bare sand provided by an embodiment of the present invention; Figure 4 This is an electron microscope image of a coated corundum provided by an embodiment of the present invention; Figure 5 This is an electron microscope image of a semi-coated corundum provided by an embodiment of the present invention. The highlighted part in the image is the surface of the corundum without the nickel-plated metal layer, and the shaded part is the nickel-plated layer of the corundum. Figure 5 It can be clearly seen that part of the surface of the semi-nickel-plated corundum is coated with a metal nickel layer, while part of the surface is not coated with a metal nickel layer.

[0108] In a second aspect, an embodiment of the present invention provides a semi-coated corundum, which is prepared by the preparation method of the semi-coated corundum provided in the first aspect. For the specific preparation process of the semi-coated corundum, please refer to the relevant content of the preparation method of the semi-coated corundum provided in the first aspect, which will not be repeated here.

[0109] The semi-coated corundum in the embodiment of the present invention has a partial surface coated with a metal layer and a partial surface not coated with a metal layer. Since the portion without a metal layer is not conductive, in the electrochemical process of preparing diamond wire using the semi-coated corundum, nickel is mainly deposited on the surface of the diamond mother bar and grows at the junction of the semi-coated corundum and the coating, which greatly increases the holding force of the coating on the semi-coated corundum, thereby improving the cutting performance of the diamond wire.

[0110] In a third aspect, an embodiment of the present invention provides a diamond wire, comprising a diamond wire busbar and an inlay layer arranged on the surface of the diamond wire busbar, wherein the inlay layer is embedded with semi-coated diamond grit as provided in the second aspect, wherein, in the semi-coated diamond grit of the inlay layer, the number of the semi-coated diamond grit with the side not coated with the metal layer facing away from the surface of the diamond wire busbar accounts for not less than 50%.

[0111] In this embodiment, nickel-plated sand and semi-nickel-plated diamond sand are used to prepare diamond wires, and the morphology of the prepared diamond wires is observed using a scanning electron microscope. Figure 6 and Figure 7 , Figure 6 This is an electron microscope image of a diamond wire prepared by coating diamond sand provided by an embodiment of the present invention; Figure 7 This is an electron microscope image of a diamond wire prepared by semi-coated corundum provided in an embodiment of the present invention. Figure 6 and Figure 7 It can be seen that in the diamond wire prepared by nickel-plated sand, the surface of the diamond grit and the surface of the diamond wire mother bar are consistent, and both are coated. In the diamond wire prepared by semi-nickel-plated sand, the surface of the diamond grit and the surface of the diamond wire mother bar are inconsistent, the surface of the diamond wire mother bar is coated, and the side of some diamond grit facing the outer side of the surface of the diamond wire mother bar is not coated.

[0112] It is understandable that in the actual production process of preparing diamond wire using semi-nickel-plated sand, it cannot be ensured that the side of each semi-nickel-plated sand without the nickel-plated metal layer faces the outer surface of the diamond wire busbar. Therefore, as long as it is ensured that in the semi-nickel-plated sand of the inlaid layer, the number of semi-nickel-plated sands without the nickel-plated metal layer facing the outer surface of the diamond wire busbar accounts for no less than 50%, the production needs can be met.

[0113] The diamond wire of the embodiment of the present invention has semi-coated diamond sand embedded in the inlay layer arranged on the surface of the diamond wire busbar, and the side without the metal layer is facing away from the surface of the diamond wire busbar. Therefore, when the diamond wire is cut, the probability of the metal layer falling into the cutting fluid is greatly reduced, thereby improving the cutting efficiency of the diamond wire.

[0114] It should be noted that, in this article, the term "comprises", "comprising" or any other variant is intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device comprising the element.

[0115] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and 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, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for preparing semi-coated corundum, characterized in that: include: The plated corundum is subjected to ultrasonic water washing treatment; Mixing the plated corundum after ultrasonic washing with pure water to obtain a mixture of plated corundum and pure water; Stirring the mixture of the plated corundum and pure water, adding nitric acid solution during the stirring process, and using the nitric acid solution to corrode the surface metal layer of the plated corundum; The corroded plated corundum is cleaned and dried to obtain the semi-plated corundum.

2. The method for preparing semi-coated corundum according to claim 1, characterized in that: The particle size of the plated corundum is 6-40 μm.

3. The method for preparing semi-coated corundum according to claim 1, characterized in that: The ultrasonic washing treatment lasts for 1-5 minutes.

4. The method for preparing semi-coated corundum according to claim 1, characterized in that: The mass ratio of the plated corundum to the pure water in the mixture of the plated corundum and the pure water after ultrasonic washing is 5:

6.

5. The method for preparing semi-coated corundum according to claim 1, characterized in that: The mass concentration of nitric acid in the nitric acid solution and the mixture of the plated corundum and pure water is 10%-20%.

6. The method for preparing semi-coated corundum according to claim 1, characterized in that: The stirring time is 2-10 min.

7. The method for preparing semi-coated corundum according to claim 1, characterized in that: The temperature of the drying process is 30-80°C.

8. The method for preparing semi-coated corundum according to claim 1, characterized in that: The coverage area of ​​the surface metal layer in the semi-coated corundum is 30-70% of the surface area of ​​the corundum.

9. A semi-coated corundum, characterized in that: The semi-coated corundum is prepared by the preparation method of any one of claims 1 to 8.

10. A diamond wire, characterized in that: It comprises a diamond wire busbar and an inlay layer arranged on the surface of the diamond wire busbar, wherein the inlay layer is embedded with the semi-coated corundum as claimed in claim 9, wherein, in the semi-coated corundum in the inlay layer, the number of the semi-coated corundum with the side not coated with the metal layer facing away from the surface of the diamond wire busbar accounts for not less than 50%.

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