High-performance diamond grinding wheel and preparation method thereof

Abstract

The invention relates to the technical field of super-hard grinding tool manufacturing, in particular to a high-performance diamond grinding wheel and a preparation method thereof. A high-performance diamond grinding wheel comprises a diamond grinding wheel base body, a titanium coating and a WS2-TiSiN coating, the titanium coating and the WS2-TiSiN coating are sequentially arranged on the surface of the diamond grinding wheel base body, and the diamond grinding wheel base body is prepared from, by mass, 65-72 parts of diamond grinding materials, 5-7 parts of modified fibers, 20-24 parts of ceramic binding agents and 3-5 parts of binding agents. The high-performance diamond grinding wheel has the advantages of being compact in organization structure, excellent in heat conductivity and grinding efficiency, high in grinding precision, long in service life, good in mechanical property and good in oxidation resistance. The method is widely applied to titanium alloy grinding machining, and the problems occurring in the titanium alloy grinding process are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of superhard abrasive tool manufacturing, and in particular to a high-performance diamond grinding wheel and a preparation method thereof. Background Art

[0002] Titanium alloy has low density, high specific strength, good corrosion resistance, good mechanical and mechanical properties, and has become an indispensable material in the aerospace field. With the development of science and technology and the improvement of product performance, the requirements for the dimensional accuracy and surface roughness of titanium alloy parts are getting higher and higher. Due to the physical and mechanical properties of titanium alloy materials themselves, surface burns and reduced surface integrity are prone to occur during grinding. At present, it is urgent to solve the problem of grinding titanium alloy materials, which has become the main reason for its failure to be widely promoted and applied. Therefore, it is very necessary to choose a suitable grinding wheel.

[0003] At present, the abrasives used for grinding titanium alloys are mainly "ordinary abrasive green silicon carbide". Since the grinding wheels made of ordinary abrasive green silicon carbide have a low linear speed (15-20m / s) and a small cutting depth (no more than 0.02mm), they have problems such as short life, low efficiency and poor antioxidant ability. The processing requirements are roughness Ra 0.2, allowance 0.3mm, grinding efficiency 25 seconds, and even quality problems such as burns and cracks appear on the surface of the workpiece. At the same time, grinding chips are easy to adhere to the grinding edge, resulting in extremely low durability of the grinding wheel. Summary of the invention

[0004] The purpose of this application is to provide a high-performance diamond grinding wheel and its preparation method in view of the shortcomings of the current technology. The high-performance diamond grinding wheel of this application has a dense structure, excellent thermal conductivity, grinding efficiency, high grinding precision, service life, mechanical properties and anti-oxidation ability. It is widely used in titanium alloy grinding and effectively solves the problems arising in the titanium alloy grinding process.

[0005] In the first aspect, the present application provides a high-performance diamond grinding wheel, which adopts the following technical solution: A high-performance diamond grinding wheel comprises a diamond grinding wheel matrix and a titanium coating and a WS2-TiSiN coating arranged in sequence on the surface of the diamond grinding wheel matrix, wherein the diamond grinding wheel matrix comprises the following preparation raw materials by mass: 65-72 parts of diamond abrasive, 5-7 parts of modified fiber, 20-24 parts of ceramic binder and 3-5 parts of adhesive.

[0006] By adopting the above technical solutions, diamond abrasive: As the main grinding component, diamond can effectively process difficult-to-process materials such as titanium alloys with its extremely high hardness and good grinding performance. Modified fiber: The addition of modified fiber improves the impact resistance and bending strength of the grinding wheel and reduces the wear ratio of the grinding wheel, thereby solving the problem of low machining accuracy of the diamond grinding wheel. In particular, the mixed use of carbon nanotubes and aramid fibers further enhances the mechanical properties of the grinding wheel. Ceramic binder: The ceramic binder composed of bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide not only reduces the sintering temperature, but also improves the thermal stability and mechanical properties of the grinding wheel. This binder can effectively prevent diamond graphitization, thereby maintaining the efficient grinding performance of the grinding wheel. WS2-TiSiN coating: The coating has the characteristics of high hardness, high strength, corrosion resistance and wear resistance, and can significantly improve the service life, grinding efficiency and oxidation resistance of the grinding wheel. Binder: The melamine formaldehyde resin and phenolic resin used are blended to increase the brittleness and self-sharpening of the resin binder, which helps to avoid clogging of the grinding wheel and improve grinding efficiency. The synergistic effect of each component gives the grinding wheel excellent thermal conductivity, efficient grinding performance, high-precision grinding effect and a long service life. The combination of modified fiber and ceramic binder improves the physical and mechanical properties of the grinding wheel, while the WS2-TiSiN coating enhances the chemical stability and wear resistance of the grinding wheel. The overall design makes the grinding wheel particularly suitable for grinding materials such as titanium alloys, and effectively solves the problems encountered by traditional diamond grinding wheels when grinding such materials. In summary, the high-performance diamond grinding wheel of the present application achieves excellent grinding performance and durability by optimizing each component and its ratio, and is particularly suitable for the processing of difficult materials.

[0007] Preferably, the ceramic binder comprises the following raw materials, calculated by weight: 30-35 parts of bismuth oxide, 25-28 parts of boron oxide, 20-24 parts of silicon oxide, 4-6 parts of aluminum oxide, and 6-8 parts of zirconium oxide.

[0008] Preferably, the method for preparing the ceramic binder comprises the following steps: S31, according to the mass fraction, put bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide into a ball mill and mix them thoroughly, set the ball mill speed to 250r / min, the ball milling time to 4h, and the ball-to-material ratio to 3:1 to obtain a mixed material; S32. Put the mixture into a corundum crucible and then melt it. Set the melting temperature to 850°C and the melting time to 1-1.5h. After the melting is completed, water quench it and then ball mill it. The ball mill speed is 250r / min, the ball milling time is 5h, and the ball-to-material ratio is 4:1. After ball milling, dry it and pass it through a 400-mesh sieve to obtain a ceramic binder.

[0009] By adopting the above technical scheme, the ceramic binder is a mixed powder composed of bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide. The ceramic binder not only has the characteristics of low melting and sintering temperature and high connection strength of the original bismuth oxide-boron oxide system, but also can prevent diamond graphitization when preparing diamond grinding wheels, thereby avoiding the low grinding efficiency caused by graphitization of abrasive grains during the grinding process of diamond grinding wheels; it also has the advantages of reducing the thermal expansion coefficient of glass and improving thermal stability, strength and hardness due to the addition of silicon oxide and aluminum oxide. At the same time, the addition of zirconium oxide can significantly improve the glass mechanical properties of the ceramic binder, as well as improve the bending strength of the binder, reduce the thermal expansion coefficient, increase the density of the binder, and improve the wetting performance of the binder to diamond. As a result, the prepared corundum grinding wheel has the characteristics of low sintering temperature, excellent mechanical properties, and good grinding performance of the grinding wheel.

[0010] Preferably, the preparation method of the modified fiber is to disperse 90 parts of aramid fibers and 10 parts of carbon nanotubes in a solution consisting of 200 parts of ethanol and 50 parts of water, according to their mass fractions, then add vinyl triethoxysilane to 2 parts of the solution, adjust the pH of the solution to 5-6, stir for 2-3 hours, centrifuge, wash and dry to obtain the modified fiber, wherein the carbon nanotubes have a diameter of 10-30 nm and an aspect ratio of 50-80; the aramid fibers have a diameter of 1-5 microns and an aspect ratio of 10-30.

[0011] By adopting the above technical solution, carbon nanotubes have good rigidity but high brittleness, and aramid fibers have weak reinforcement effect but good flexibility. The two kinds of fibers are mixed and added to improve the impact resistance and bending strength of the grinding wheel and reduce the wear ratio of the grinding wheel. Before use, the mixed fibers are mixed, impregnated with vinyl triethoxysilane, stirred evenly, and dried. The surface-modified fibers are closely bridged with the resin binder, which improves its dispersibility and compatibility, and has a significant reinforcement effect. By adding modified fibers, the impact resistance of the grinding wheel is improved, the wear ratio of the grinding wheel is reduced, and the problem of low machining precision of the diamond grinding wheel is solved.

[0012] Preferably, the binder is composed of melamine formaldehyde resin and phenolic resin in a mass ratio of 1:4-6.

[0013] By adopting the above technical solutions, the role of the binder in high-performance diamond grinding wheels is mainly reflected in the following aspects: Fixing abrasives: The main function of the binder is to firmly fix the diamond abrasives on the grinding wheel matrix to ensure that the abrasives will not fall off during high-speed grinding, thereby ensuring the service life and grinding efficiency of the grinding wheel. Filling gaps: The binder can also fill the gaps between the matrix materials, improve the overall density of the grinding wheel, and thus improve the mechanical strength and durability of the grinding wheel. Adjusting performance: By adjusting the type and proportion of the binder, the hardness, toughness and wear resistance of the grinding wheel can be adjusted to make it more suitable for specific grinding applications. The synergistic effects between melamine formaldehyde resin and phenolic resin are as follows: Synergistic enhancement: Melamine formaldehyde resin has good wear resistance and fast curing, while phenolic resin has good heat resistance and mechanical strength. After the two are combined, the overall strength and toughness of the binder can be improved while maintaining good wear resistance. Optimized performance: The addition of melamine formaldehyde resin can increase the brittleness and self-sharpening of the resin binder, which means that during the grinding process, the worn abrasive particles are more likely to fall off and new sharp abrasive particles are exposed, thereby avoiding clogging of the grinding wheel, achieving the effect of unblocking and improving grinding efficiency. Compatible curing: The curing temperatures of the two are similar, which can ensure that the binder can be cured evenly during the preparation process and will not cause grinding wheel quality problems due to uneven curing. In summary, the combination of melamine formaldehyde resin and phenolic resin plays a key role in high-performance diamond grinding wheels, which not only improves the mechanical properties of the grinding wheel, but also optimizes its performance during use.

[0014] Preferably, the particle size of the diamond abrasive is 800-2000 mesh.

[0015] Preferably, the method for preparing the titanium coating comprises: using physical vapor deposition to sputter and deposit on the surface of a diamond grinding wheel substrate in a vacuum environment to form a titanium coating with a thickness of 0.3-0.4 microns.

[0016] Preferably, the preparation method of the WS2-TiSiN coating is to place a WS2 target material and a TiSi target material with a purity of 99.99% into the working room of an ion plating machine, evacuate the working room to make it a vacuum environment, introduce argon and nitrogen, and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 120-130 minutes, and the working gas pressure is maintained at 0.03MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material are dissociated and deposited on the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.0-1.2 microns.

[0017] By adopting the above technical scheme, a WS2-TiSiN coating is provided on the surface of the diamond grinding wheel. The coating has the advantages of high hardness, high strength, corrosion resistance, wear resistance and anti-fouling, which is beneficial to improving the service life, grinding efficiency and oxidation resistance of the grinding wheel.

[0018] In a second aspect, the present application provides a method for preparing a high-performance diamond grinding wheel, which adopts the following technical solution: As a general technical concept, the present application also provides a method for preparing the above-mentioned high-performance diamond grinding wheel, comprising the following steps: S91, uniformly mixing diamond abrasive, modified fiber, ceramic binder and adhesive according to mass fractions, ball milling for 5 hours, drying at 120°C for 3 hours, and passing through a 300-mesh sieve to obtain a molding material; S92, putting the molding material into the assembled mold with the matrix, scraping the material flat, and covering with a pressure head; placing the mold on a hot press at 180-220°C, preheating, pressurizing, maintaining the pressure at 3MPa for 40min, cooling to 80°C to release the pressure and mold, and cooling to room temperature after sintering the grinding wheel blank to obtain a diamond grinding wheel matrix; wherein the sintering process is: first heating to 300-350°C, maintaining the temperature for 20-40min, and then heating to 750-800°C, maintaining the temperature for 60-90min.

[0019] S93, placing the diamond grinding wheel substrate in a vacuum coating device, and using physical vapor deposition to sputter and deposit a titanium coating with a thickness of 0.3-0.4 microns on the surface of the diamond grinding wheel substrate in a vacuum environment, thereby obtaining a diamond grinding wheel with a deposited titanium coating; S94. Place WS2 target material with a purity of 99.99%, TiSi target material with a purity of 99.99%, and a diamond grinding wheel with a deposited titanium coating into the working room of an ion plating machine. Evacuate the working room to make it a vacuum environment, introduce argon and nitrogen, and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 120-130 minutes, and the working gas pressure is maintained at 0.03MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material will dissociate and deposit onto the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.0-1.2 microns to obtain a high-performance diamond grinding wheel.

[0020] In summary, the beneficial technical effects of this application are: 1. Dense structure: Due to the use of a specific proportion of diamond abrasives, modified fibers, vitrified binders and adhesives, the grinding wheel has a denser structure, which helps to improve the overall strength and durability of the grinding wheel.

[0021] 2. Excellent thermal conductivity: The silicon oxide and aluminum oxide components in the vitrified binder improve thermal stability, allowing the grinding wheel to maintain good performance at high temperatures, effectively conduct heat, and reduce thermal damage during the grinding process.

[0022] 3. High grinding efficiency and precision: The high hardness and wear resistance of the WS2-TiSiN coating, coupled with the addition of modified fibers, improve the impact resistance and bending strength of the grinding wheel, thereby improving grinding efficiency and processing accuracy.

[0023] 4. Long service life: The corrosion and wear resistance of the WS2-TiSiN coating, as well as the addition of modified fibers, significantly extend the service life of the grinding wheel.

[0024] 5. Excellent mechanical properties: Zirconia in the vitrified binder increases the bending strength and reduces the thermal expansion coefficient, making the grinding wheel less likely to be damaged when subjected to high loads.

[0025] 6. Strong anti-oxidation ability: The combination of WS2-TiSiN coating and modified fiber enhances the anti-oxidation ability of the grinding wheel, making it perform well in high temperature and corrosive environments. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. In the examples, if specific conditions are not specified, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0027] In the following examples and preparation examples, 1 part means 100 g.

[0028] Preparation Example 1 Preparation of Vitrified Binder The ceramic binder comprises the following raw materials, calculated by weight: 33 parts of bismuth oxide, 27 parts of boron oxide, 22 parts of silicon oxide, 5 parts of aluminum oxide, and 7 parts of zirconium oxide; The method for preparing a ceramic binder comprises the following steps: S31, according to the mass fraction, put bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide into a ball mill and mix them thoroughly, set the ball mill speed to 250r / min, the ball milling time to 4h, and the ball-to-material ratio to 3:1 to obtain a mixed material; S32. Put the mixture into a corundum crucible and then melt it. Set the melting temperature to 850°C and the melting time to 1.3 hours. After the melting is completed, water quench it and then ball mill it. The ball mill speed is 250r / min, the ball milling time is 5 hours, and the ball-to-material ratio is 4:1. After ball milling, dry it and pass it through a 400-mesh sieve to obtain a ceramic binder.

[0029] Preparation Example 2 Preparation of modified fiber The preparation method of the modified fiber is as follows: according to the mass parts, 90 parts of aramid fiber and 10 parts of carbon nanotube are dispersed in a solution composed of 200 parts of ethanol and 50 parts of water, and then vinyl triethoxysilane is added to 2 parts of the solution, the pH of the solution is adjusted to 5.6, and the solution is stirred for 2.3 hours. The modified fiber is obtained by centrifugation, washing and drying, wherein the carbon nanotube has a diameter of 10-30nm and an aspect ratio of 50-80; the aramid fiber has a diameter of 1-5 microns and an aspect ratio of 10-30.

[0030] Example 1 A high-performance diamond grinding wheel comprises a diamond grinding wheel substrate and a titanium coating and a WS2-TiSiN coating arranged on the surface of the diamond grinding wheel substrate in sequence, wherein the diamond grinding wheel substrate comprises the following preparation raw materials by weight: 65 parts of diamond abrasive (average particle size of 1200 mesh), 5 parts of modified fiber, 20 parts of ceramic binder, and 3 parts of adhesive, wherein the adhesive is composed of melamine formaldehyde resin and phenolic resin in a weight ratio of 1:4, the thickness of the titanium coating is 0.3 micrometers; the thickness of the WS2-TiSiN coating is 1.0 micrometers; The method for preparing the high-performance diamond grinding wheel comprises the following steps: S91. Evenly mix the diamond abrasive, modified fiber, ceramic binder and adhesive according to their weight fractions, ball mill for 5 hours, dry at 120° C. for 3 hours, and pass through a 300-mesh sieve to obtain a molding material; S92, put the molding material into the assembled mold with the base, scrape the material flat, and cover it with a pressure head; put the mold on a hot press at 180℃, preheat, pressurize, maintain the pressure at 3MPa for 40min, cool to 80℃ to release the pressure and mold, and after sintering, cool to room temperature to obtain a diamond grinding wheel base; wherein the sintering process is: first heat up to 300℃, keep warm for 40min, then heat up to 750℃, and keep warm for 90min.

[0031] S93, placing the diamond grinding wheel substrate into a vacuum coating device, sputtering and depositing a titanium coating with a thickness of 0.3 micrometers on the surface of the diamond grinding wheel substrate under a vacuum of 0.03 MPa, to obtain a diamond grinding wheel with a deposited titanium coating; S94. Place a WS2 target material with a purity of 99.99%, a TiSi target material with a purity of 99.99%, and a diamond grinding wheel with a deposited titanium coating into the working room of an ion plating machine. Evacuate the working room to make it a vacuum environment, introduce argon and nitrogen (the volume ratio of argon and nitrogen is 1:10), and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 120 minutes, and the working gas pressure is maintained at 0.03 MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material will dissociate and deposit onto the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.0 micron, thereby obtaining a high-performance diamond grinding wheel.

[0032] Example 2 A high-performance diamond grinding wheel comprises a diamond grinding wheel substrate and a titanium coating and a WS2-TiSiN coating arranged on the surface of the diamond grinding wheel substrate in sequence, wherein the diamond grinding wheel substrate comprises the following preparation raw materials by weight: 72 parts of diamond abrasive (average particle size of 1200 mesh), 7 parts of modified fiber, 24 parts of ceramic binder, and 5 parts of adhesive, wherein the adhesive is composed of melamine formaldehyde resin and phenolic resin in a weight ratio of 1:6, the thickness of the titanium coating is 0.4 microns; the thickness of the WS2-TiSiN coating is 1.2 microns; The method for preparing the high-performance diamond grinding wheel comprises the following steps: S91. Evenly mix the diamond abrasive, modified fiber, ceramic binder and adhesive according to their weight fractions, ball mill for 5 hours, dry at 120° C. for 3 hours, and pass through a 300-mesh sieve to obtain a molding material; S92, put the molding material into the assembled mold with the matrix, scrape the material flat, and cover it with a pressure head; put the mold on a hot press at 220℃, preheat, pressurize, maintain the pressure at 3MPa for 40min, cool to 80℃ to release the pressure and mold, and after sintering, cool to room temperature to obtain the diamond grinding wheel matrix; wherein the sintering process is: first heat up to 350℃, keep warm for 20min, then heat up to 800℃, and keep warm for 60min.

[0033] S93, placing the diamond grinding wheel substrate into a vacuum coating device, and sputtering and depositing a titanium coating with a thickness of 0.4 micrometers on the surface of the diamond grinding wheel substrate under a vacuum of 0.03 MPa, to obtain a diamond grinding wheel with a deposited titanium coating; S94. Place a WS2 target material with a purity of 99.99%, a TiSi target material with a purity of 99.99%, and a diamond grinding wheel with a deposited titanium coating into the working room of an ion plating machine. Evacuate the working room to make it a vacuum environment, introduce argon and nitrogen (the volume ratio of argon and nitrogen is 1:10), and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 130 minutes, and the working gas pressure is maintained at 0.03 MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material will dissociate and deposit onto the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.2 microns to obtain a high-performance diamond grinding wheel.

[0034] Example 3 A high-performance diamond grinding wheel comprises a diamond grinding wheel substrate and a titanium coating and a WS2-TiSiN coating arranged on the surface of the diamond grinding wheel substrate in sequence, wherein the diamond grinding wheel substrate comprises the following preparation raw materials by weight: 68 parts of diamond abrasive (average particle size of 1200 mesh), 6 parts of modified fiber, 22 parts of ceramic binder, and 4 parts of adhesive, wherein the adhesive is composed of melamine formaldehyde resin and phenolic resin in a weight ratio of 1:5, the thickness of the titanium coating is 0.35 microns; the thickness of the WS2-TiSiN coating is 1.1 microns; The method for preparing the high-performance diamond grinding wheel comprises the following steps: S91. Evenly mix the diamond abrasive, modified fiber, ceramic binder and adhesive according to their weight fractions, ball mill for 5 hours, dry at 120° C. for 3 hours, and pass through a 300-mesh sieve to obtain a molding material; S92, put the molding material into the assembled mold with the base, scrape the material flat, and cover it with a pressure head; put the mold on a hot press at 190℃, preheat, pressurize, maintain the pressure at 3MPa for 40min, cool to 80℃ to release the pressure and mold, and after sintering, cool to room temperature to obtain the diamond grinding wheel base; wherein the sintering process is: first heat up to 320℃, keep warm for 30min, then heat up to 780℃, and keep warm for 80min.

[0035] S93, placing the diamond grinding wheel substrate into a vacuum coating device, and sputtering and depositing a titanium coating with a thickness of 0.35 micrometers on the surface of the diamond grinding wheel substrate under a vacuum of 0.03 MPa, to obtain a diamond grinding wheel with a deposited titanium coating; S94. Place WS2 target material with a purity of 99.99%, TiSi target material with a purity of 99.99%, and a diamond grinding wheel with a deposited titanium coating into the working room of an ion plating machine. Evacuate the working room to make it a vacuum environment, introduce argon and nitrogen (the volume ratio of argon and nitrogen is 1:10), and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 126 minutes, and the working gas pressure is maintained at 0.03 MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material will dissociate and deposit onto the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.1 microns to obtain a high-performance diamond grinding wheel.

[0036] Comparative Example 1 The same as Example 3, except that the modified fiber is replaced by a mixture of equal amounts of aramid fibers (diameter 1-5 microns, aspect ratio 10-30) and carbon nanotubes (diameter 10-30 nm, aspect ratio 50-80) uniformly mixed in a mass ratio of 9:1.

[0037] Comparative Example 2 The same as Example 3, except that the binder is melamine formaldehyde resin.

[0038] Comparative Example 3 The same as Example 3, except that the binder is phenolic resin.

[0039] Comparative Example 4 The same as Example 3, except that an equal mixture (prepared by uniformly mixing bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide in a mass ratio of 33:27:2:5:7) is used instead of the ceramic binder.

[0040] Comparative Example 5 Same as Example 3, except that the thickness of the titanium coating is 0 micrometer; the thickness of the WS2-TiSiN coating is 0 micrometer.

[0041] Performance Testing The high performance diamond grinding wheels prepared in Example 1, Example 3 and Comparative Examples 1 to Comparative Examples 5 were sampled and subjected to the following evaluation tests. The test results are shown in Table 1.

[0042] Hardness test: Tested according to GB / T4340.1-2009 standard; Impact strength test: measured using XJ-300A impact testing machine; Bending strength test: According to GB / T6569-2006 standard, the three-point bending strength method is used to test the bending strength on the SKZ-500 digital display bending testing machine; And the grinding performance tests were carried out, including wear ratio, surface roughness and grinding conditions.

[0043] Table 1 Performance test Analyzing the data in Table 1, we can see that: 1) The high-performance diamond grinding wheels prepared in Examples 1 to 3 have a dense structure, excellent thermal conductivity, grinding efficiency, high grinding precision, service life, mechanical properties and antioxidant ability.

[0044] 2) The performance comparison analysis of the high-performance diamond grinding wheel obtained in combination with Example 3 and Comparative Example 1 shows that the surface-modified fiber is closely bridged with the resin binder, improving its dispersibility and compatibility, and the enhancement effect is significant. By adding the modified fiber, the impact resistance of the grinding wheel is improved, the wear ratio of the grinding wheel is reduced, and the problem of low machining precision of the diamond grinding wheel is solved.

[0045] 3) The performance comparison analysis of the high-performance diamond grinding wheel prepared in combination with Example 3 and Comparative Examples 2-3 shows that the binder is composed of melamine formaldehyde resin and phenolic resin in a mass ratio of 1:5, and the synergistic effect between melamine formaldehyde resin and phenolic resin is as follows: Synergistic enhancement: melamine formaldehyde resin has good wear resistance and fast curing, while phenolic resin has good heat resistance and mechanical strength. After the two are combined, the overall strength and toughness of the binder can be improved while maintaining good wear resistance. Optimized performance: The addition of melamine formaldehyde resin can increase the brittleness and self-sharpening of the resin binder, which means that during the grinding process, the worn abrasive particles are more likely to fall off, and new sharp abrasive particles are exposed, thereby avoiding clogging of the grinding wheel, achieving the effect of dredging, and improving grinding efficiency. Compatible curing: The curing temperatures of the two are similar, which can ensure that the binder can be evenly cured during the preparation process, and will not cause grinding wheel quality problems due to uneven curing. In summary, the combination of melamine formaldehyde resin and phenolic resin plays a key role in high-performance diamond grinding wheels, which not only improves the mechanical properties of the grinding wheels, but also optimizes their performance during use.

[0046] 4) The performance comparison analysis of the high-performance diamond grinding wheel prepared in combination with Example 3 and Comparative Example 4 shows that the ceramic binder prepared in this application not only has the characteristics of low melting and sintering temperature and high connection strength of the original bismuth oxide-boron oxide system, but also can prevent diamond graphitization when preparing diamond grinding wheel, thereby avoiding the low grinding efficiency caused by graphitization of abrasive grains during the grinding process of diamond grinding wheel; it also has the advantages of reducing the thermal expansion coefficient of glass, improving thermal stability, strength and hardness due to the addition of silicon oxide and aluminum oxide. At the same time, the addition of zirconium oxide can significantly improve the glass mechanical properties of the ceramic binder, as well as improve the bending strength of the binder, reduce the thermal expansion coefficient, increase the density of the binder, and improve the wetting performance of the binder to diamond. As a result, the prepared corundum grinding wheel has the characteristics of low sintering temperature, excellent mechanical properties, and good grinding performance of the grinding wheel.

[0047] 5) The comparative analysis of the performance of the high-performance diamond grinding wheels prepared in Example 3 and Comparative Example 5 shows that a WS2-TiSiN coating is provided on the surface of the diamond grinding wheel. The coating has the advantages of high hardness, high strength, corrosion resistance, wear resistance and anti-fouling, which is beneficial to improving the service life, grinding efficiency, surface roughness and oxidation resistance of the grinding wheel.

[0048] The above embodiments are only used to explain the technical solutions of the present application rather than to limit them. Although the above embodiments provide a specific description of the present application, relevant technical personnel should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modifications and equivalent replacements that do not depart from the spirit and scope of the present application should be included in the scope of protection of the present application.

Claims

1. A high performance diamond grinding wheel, characterized in that: The invention comprises a diamond grinding wheel matrix and a titanium coating and a WS2-TiSiN coating arranged in sequence on the surface of the diamond grinding wheel matrix, wherein the diamond grinding wheel matrix comprises the following preparation raw materials by weight: 65-72 parts of diamond abrasive, 5-7 parts of modified fiber, 20-24 parts of ceramic binder and 3-5 parts of adhesive.

2. A high performance diamond grinding wheel according to claim 1, characterized in that: The ceramic binder comprises the following raw materials, calculated by weight: 30-35 parts of bismuth oxide, 25-28 parts of boron oxide, 20-24 parts of silicon oxide, 4-6 parts of aluminum oxide, and 6-8 parts of zirconium oxide.

3. A high performance diamond grinding wheel according to claim 1, characterized in that: The method for preparing the ceramic binder comprises the following steps: S31, according to the mass fraction, put bismuth oxide, boron oxide, silicon oxide, aluminum oxide and zirconium oxide into a ball mill and mix them thoroughly, set the ball mill speed to 250r / min, the ball milling time to 4h, and the ball-to-material ratio to 3:1 to obtain a mixed material; S32. Put the mixture into a corundum crucible and then melt it. Set the melting temperature to 850°C and the melting time to 1-1.5h. After the melting is completed, water quench it and then ball mill it. The ball mill speed is 250r / min, the ball milling time is 5h, and the ball-to-material ratio is 4:

1. After ball milling, dry it and pass it through a 400-mesh sieve to obtain a ceramic binder.

4. A high performance diamond grinding wheel according to claim 1, characterized in that: The preparation method of the modified fiber is as follows: according to the mass proportions, 90 parts of aramid fiber and 10 parts of carbon nanotube are dispersed in a solution consisting of 200 parts of ethanol and 50 parts of water, then vinyl triethoxysilane is added to 2 parts of the solution, the pH of the solution is adjusted to 5-6, stirred for 2-3 hours, centrifuged, washed and dried to obtain the modified fiber, wherein the carbon nanotube has a diameter of 10-30 nm and an aspect ratio of 50-80; the aramid fiber has a diameter of 1-5 microns and an aspect ratio of 10-30.

5. A high performance diamond grinding wheel according to claim 1, characterized in that: The binder is composed of melamine formaldehyde resin and phenolic resin in a mass ratio of 1:4-6.

6. A high performance diamond grinding wheel according to claim 1, characterized in that: The particle size of the diamond abrasive is 800-2000 meshes.

7. A high performance diamond grinding wheel according to claim 1, characterized in that: The method for preparing the titanium coating comprises: adopting a physical vapor deposition method to sputter and deposit on the surface of a diamond grinding wheel substrate in a vacuum environment to form a titanium coating with a thickness of 0.3-0.4 microns.

8. A high performance diamond grinding wheel according to claim 1, characterized in that: The preparation method of the WS2-TiSiN coating is as follows: placing a WS2 target material and a TiSi target material with a purity of 99.99% into a working room of an ion plating machine, evacuating the working room to make it a vacuum environment, introducing argon gas and nitrogen gas, and performing dual-target co-sputtering by radio frequency magnetron sputtering. The deposition time is 120-130 minutes, and the working gas pressure is maintained at 0.03 MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, so that the atoms on the surface of the target material are dissociated and deposited on the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.0-1.2 microns.

9. A method for preparing a high-performance diamond grinding wheel according to any one of claims 1 to 8, characterized in that: The following steps are involved: S91. Evenly mix the diamond abrasive, modified fiber, ceramic binder and adhesive according to their weight fractions, ball mill for 5 hours, dry at 120° C. for 3 hours, and pass through a 300-mesh sieve to obtain a molding material; S92, put the molding material into the assembled mold with the matrix, scrape the material flat, and cover it with a pressure head; put the mold on a hot press at 180-220℃, preheat, pressurize, maintain the pressure at 3MPa for 40min, cool to 80℃ to release the pressure and mold, and after sintering, cool to room temperature to obtain a diamond grinding wheel matrix; wherein the sintering process is: first heat up to 300-350℃, keep warm for 20-40min, then heat up to 750-800℃, and keep warm for 60-90min. 10.S93, placing the diamond grinding wheel substrate in a vacuum coating device, and using physical vapor deposition to sputter and deposit a titanium coating with a thickness of 0.3-0.4 μm on the surface of the diamond grinding wheel substrate in a vacuum environment, thereby obtaining a diamond grinding wheel with a deposited titanium coating; S94. Place WS2 target material with a purity of 99.99%, TiSi target material with a purity of 99.99%, and a diamond grinding wheel with a titanium coating deposited thereon into the working room of an ion plating machine. Evacuate the working room to make it a vacuum environment, introduce argon and nitrogen, and use radio frequency magnetron sputtering to perform dual-target co-sputtering. The deposition time is 120-130 minutes, and the working gas pressure is maintained at 0.03 MPa. The gas molecules generated under high pressure will be accelerated to bombard the target material under the action of the electric field, causing the atoms on the surface of the target material to dissociate and deposit onto the surface of the titanium coating of the grinding wheel, forming a WS2-TiSiN coating with a thickness of 1.0-1.2 microns to produce a high-performance diamond grinding wheel.

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