Brittle corrosion-resistant metallic bond, metallic bond superhard grinding wheel and preparation method of metallic bond superhard grinding wheel

Abstract

The invention belongs to the technical field of grinding of grinding tools, and discloses a brittle corrosion-resistant metallic bond, a metallic bond superhard grinding wheel and a preparation method of the metallic bond superhard grinding wheel. The brittle corrosion-resistant metal bonding agent prepared by the invention comprises the following raw materials in parts by weight: 50-70 parts of copper powder, 5-20 parts of tin powder, 5-15 parts of graphite powder and 15-20 parts of an improvement additive. Graphite powder and an improvement additive are added into a traditional bronze-based metal binding agent, secondary heat treatment is carried out, the plasticity of the binding agent is reduced, the brittleness and hardness of the binding agent are improved, brittle fracture can occur in time, and the workpiece quality cannot be affected; through secondary heat treatment, elements in the improvement additive form a uniform and compact protective film on the grinding wheel, internal metal can be continuously prevented from being corroded in the whole life cycle of the grinding wheel, and the thickness consistency problem caused by corrosion of the side face in the using process of the grinding wheel is solved. The brittleness and corrosion resistance of the bronze-based metal bonding agent are improved on the premise that the cost is not obviously increased.

Description

A brittle corrosion-resistant metal bond, a metal-bonded superhard grinding wheel and its preparation method Technical Field

[0001] This invention belongs to the field of abrasive grinding technology, and specifically refers to a method for preparing a corrosion-resistant metal-bonded superhard grinding wheel. Background Technology

[0002] Metal-bonded superhard grinding wheels use diamond or cubic boron nitride as abrasives, mixed with various metal powders as a binder, and then sintered to form a grinding wheel with a specific shape and strength. They are widely used in cutting operations in semiconductor packaging devices, ceramics, and coated glass. The metal binder in superhard grinding wheels plays a crucial role in holding the abrasive, directly affecting the various performance characteristics of the grinding wheel; therefore, the development of the binder is of paramount importance. Bronze-based (copper-tin) metal binders are one of the most common types of metal binders, possessing good formability, strength, wear resistance, and excellent thermal and electrical conductivity.

[0003] Existing research indicates that bronze-based metal-bonded superhard grinding wheels possess high strength and lifespan; however, two shortcomings remain in practical applications that urgently need to be addressed. Firstly, the high plasticity and strength of the binder lead to plastic deformation when cutting resistance increases or the cutting edge becomes blocked. This prevents timely wear and breakage, resulting in wheel deformation and substandard workpiece dimensions. Previous research (CN112405376B) has addressed this by adding ceramic powder to reduce binder plasticity, but ceramic powder also reduces the binder's thermal and electrical conductivity. While adding silver powder can compensate for this loss, it significantly increases costs, leading to decreased profits. Secondly, superhard grinding wheels generate substantial heat during use, requiring continuous cooling water rinsing. However, the cooling water used in actual production is often recycled tap water. Prolonged exposure of the grinding wheel to air and water containing numerous impurities poses a corrosion risk. The corrosion products on its sides are typically poorly compacted and have low strength, making them prone to peeling and affecting the uniformity of the grinding wheel thickness. Currently, no research has focused on the corrosion resistance of bronze-based metal-bonded grinding wheels. Regarding the surface corrosion problem of grinding wheels, existing work (CN204338414U) mentions applying anti-rust oil to the end face of the grinding wheel after machining. This treatment usually only forms a thin corrosion-resistant layer on the surface of the grinding wheel, which can achieve static corrosion protection. However, for grinding wheels whose surfaces are under continuous dynamic wear, this treatment is not sufficient to achieve corrosion protection throughout the entire service life. Regarding improving the corrosion resistance of copper alloys, existing work (CN114395710A, CN119287191A) achieves corrosion protection by adjusting the alloy composition and processing technology. However, the melting and casting process of these alloys exceeds 1100℃, and the metal is in a liquid state, forming a uniform microstructure. However, the sintering temperature of grinding wheels is usually lower than the melting point of the metal, resulting in solid-state sintering. Simply adjusting the alloy composition cannot form a uniform microstructure like that of cast alloys. The alloying elements cannot be evenly distributed within the matrix, resulting in no significant improvement in corrosion protection or even a deterioration.

[0004] Therefore, it is necessary to improve the brittleness and corrosion resistance of bronze-based metal binders through reasonable formulation design without significantly increasing costs. Summary of the Invention

[0005] This invention addresses the technical problems of deformation caused by the good plasticity and high strength of existing bronze-based metal-bonded superhard grinding wheels during use, as well as their insufficient corrosion resistance. It proposes a brittle corrosion-resistant metal bond, a metal-bonded superhard grinding wheel, and its preparation method.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] This invention provides a brittle corrosion-resistant metal binder, comprising the following raw materials by weight: 50-70 parts copper powder, 5-20 parts tin powder, 5-15 parts graphite powder, and 15-20 parts improving additive powder;

[0008] The copper powder and tin powder have a particle size of 230-800 mesh; the graphite powder has a particle size of 170-800 mesh.

[0009] The improving additive powder is selected from at least one of aluminum powder, chromium powder and titanium powder, and the particle size of the improving additive powder is 230-800 mesh.

[0010] The present invention provides a method for preparing the brittle corrosion-resistant metal binder, comprising the following steps: sieving copper powder and tin powder and mixing them to obtain mixture A; sieving graphite powder and improving additive powder and mixing them with mixture A to obtain the brittle corrosion-resistant metal binder.

[0011] The present invention also provides a metal-bonded superhard grinding wheel, comprising, by weight, 15-35 parts of diamond abrasive and 65-85 parts of the brittle corrosion-resistant metal bond as described in any one of claims 1-3.

[0012] This invention provides a method for preparing the aforementioned metal-bonded superhard grinding wheel, comprising the following steps:

[0013] (1) The diamond abrasive and the brittle corrosion-resistant metal binder are mixed evenly to obtain the grinding wheel mixture, and the grinding wheel blank is obtained by cold pressing.

[0014] (2) After sintering the green grinding wheel obtained in step (1), a second heat treatment is performed to obtain a grinding wheel blank. After dressing and grinding, a metal-bonded superhard grinding wheel is obtained.

[0015] In step (1), the diamond abrasive is titanium-plated diamond with a particle size of 200-1500 mesh.

[0016] The sintering temperature in step (2) is 700-850℃ and the time is 10-20min;

[0017] The secondary heat treatment is performed at a temperature of 660-700℃ for 15-20 minutes.

[0018] This invention provides the application of the aforementioned metal-bonded superhard grinding wheel in the cutting and processing of semiconductor packaging devices, ceramics, and coated glass.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a brittle, corrosion-resistant metal binder, a superhard grinding wheel made therefrom, and a method for preparing them. First, by adding graphite powder and the aforementioned low-cost improving additive to a traditional bronze-based metal binder and performing a secondary heat treatment, the improving additive can form a hard, brittle phase with the main metal element, reducing the binder's plasticity, increasing its brittleness and hardness, reducing its strength, and making it more prone to wear. Furthermore, the wear-prone nature of graphite powder also synergistically enhances brittleness. The improved binder prevents the grinding wheel from undergoing plastic deformation under conditions of high cutting resistance and blocked cutting edges, instead causing timely brittle fracture without affecting workpiece quality. In addition, the additive does not significantly reduce the thermal and electrical conductivity of the grinding wheel. Second, the secondary heat treatment allows the improving additive elements to form a uniform and dense protective film on the grinding wheel, which continuously prevents internal metal corrosion throughout the grinding wheel's lifespan, improving the thickness uniformity problem caused by corrosion on the sides of the grinding wheel during use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 shows the force-displacement curve of the standard test strip bending test using the brittle corrosion-resistant metal binder of Example 1.

[0023] Figure 2 shows the force-displacement curves of the standard test strip using the ordinary bronze-based metal binder of Comparative Example 1 during the bending test.

[0024] Figure 3 is a photograph of the fracture surface of the metal-bonded superhard grinding wheel of Example 1.

[0025] Figure 4 shows a photograph of the fracture surface of the metal-bonded superhard grinding wheel of Comparative Example 1.

[0026] Figure 5 shows the fracture microstructure of the metal-bonded superhard grinding wheel of Example 1.

[0027] Figure 6 shows the fracture microstructure of the metal-bonded superhard grinding wheel of Comparative Example 1.

[0028] Figure 7 shows the surface condition of the workpiece after the cutting operation in Example 1.

[0029] Figure 8 is a photograph of the metal-bonded superhard abrasive wheel after cutting the dressing plate in Example 1.

[0030] Figure 9 is a photograph of the metal-bonded superhard abrasive wheel of Comparative Example 1 after cutting the dressing plate.

[0031] Figure 10 is a photograph of the metal-bonded superhard grinding wheel after immersion corrosion test in Example 1.

[0032] Figure 11 is a photograph of the metal-bonded superhard grinding wheel after immersion corrosion test in Comparative Example 1.

[0033] Figure 12 shows a photograph of the metal-bonded superhard grinding wheel after immersion corrosion test in Comparative Example 2.

[0034] Figure 13 is a microscopic aluminum element distribution diagram of the metal-bonded superhard grinding wheel of Example 1.

[0035] Figure 14 shows the microscopic aluminum element distribution of the metal-bonded superhard grinding wheel in Comparative Example 2. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0037] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the materials and reagents used are commercially available unless otherwise specified. One part of each raw material used in the following examples is 1.5g.

[0038] Example 1

[0039] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0040] (1) Sieve copper powder and tin powder, accurately weigh 50 parts of copper powder and 15 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder and aluminum powder, accurately weigh 15 parts of graphite powder and 20 parts of aluminum powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder.

[0041] (2) Accurately weigh 20 parts of diamond abrasive and 80 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0042] (3) The grinding wheel blank is put into the graphite mold and sintered at 700°C for 20 min. Then it is put into the alloy mold and subjected to a second heat treatment at 660°C for 20 min in an argon atmosphere to obtain the grinding wheel blank.

[0043] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0044] Example 2

[0045] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0046] (1) Sieve copper powder and tin powder, accurately weigh 55 parts of copper powder and 20 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder, aluminum powder and chromium powder, accurately weigh 10 parts of graphite powder, 8 parts of aluminum powder and 7 parts of chromium powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder.

[0047] (2) Accurately weigh 35 parts of diamond abrasive and 65 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0048] (3) The grinding wheel blank is put into the graphite mold and sintered at 770°C for 15 min. Then it is put into the alloy mold and subjected to a second heat treatment at 680°C for 18 min in an argon atmosphere to obtain the grinding wheel blank.

[0049] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0050] Example 3

[0051] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0052] (1) Sieve copper powder and tin powder, accurately weigh 60 parts of copper powder and 10 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder and titanium powder, accurately weigh 12 parts of graphite powder and 18 parts of titanium powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder.

[0053] (2) Accurately weigh 30 parts of diamond abrasive and 70 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0054] (3) The grinding wheel blank is put into the graphite mold and sintered at 830°C for 10 min. Then it is put into the alloy mold and subjected to a second heat treatment at 700°C for 15 min in an argon atmosphere to obtain the grinding wheel blank.

[0055] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0056] Example 4

[0057] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0058] (1) Sieve copper powder and tin powder, accurately weigh 52 parts of copper powder and 18 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder, aluminum powder, chromium powder and titanium powder, accurately weigh 15 parts of graphite powder, 5 parts of aluminum powder, 5 parts of chromium powder and 15 parts of titanium powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder;

[0059] (2) Accurately weigh 15 parts of diamond abrasive and 85 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank.

[0060] (3) The grinding wheel blank is put into the graphite mold and sintered at 800°C for 15 min. Then it is put into the alloy mold and subjected to a second heat treatment at 680°C for 18 min in an argon atmosphere to obtain the grinding wheel blank.

[0061] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0062] Example 5

[0063] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0064] (1) Sieve copper powder and tin powder, accurately weigh 70 parts of copper powder and 5 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder and chromium powder, accurately weigh 5 parts of graphite powder and 20 parts of chromium powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder.

[0065] (2) Accurately weigh 32 parts of diamond abrasive and 68 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0066] (3) The grinding wheel blank is put into the graphite mold and sintered at 850°C for 10 min. Then it is put into the alloy mold and subjected to a second heat treatment at 700°C for 15 min in an argon atmosphere to obtain the grinding wheel blank.

[0067] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0068] Comparative Example 1

[0069] A method for preparing a conventional bronze-based metal-bonded superhard grinding wheel, comprising the following steps:

[0070] (1) Sift the copper powder and tin powder, accurately weigh 85 parts of copper powder and 15 parts of tin powder, and mix them evenly using a ball mill to obtain a bronze-based metal binder;

[0071] (2) Accurately weigh 20 parts of diamond abrasive and 80 parts of bronze-based metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0072] (3) The green grinding wheel blank is placed into a graphite mold and sintered at 700°C for 20 minutes to obtain the grinding wheel blank;

[0073] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0074] Comparative Example 2

[0075] A method for preparing a metal-bonded superhard grinding wheel, the specific steps of which are as follows:

[0076] (1) Sieve copper powder and tin powder, accurately weigh 50 parts of copper powder and 15 parts of tin powder, and mix them evenly with ball mill to obtain mixture A; sieve graphite powder and aluminum powder, accurately weigh 15 parts of graphite powder and 20 parts of aluminum powder, and mix them evenly with mixture A with ball mill to obtain brittle corrosion resistant metal binder.

[0077] (2) Accurately weigh 20 parts of diamond abrasive and 80 parts of brittle corrosion-resistant metal binder, mix them evenly using a high-speed mixer to obtain a grinding wheel mixture, and put the grinding wheel mixture into a steel mold for cold pressing to obtain a grinding wheel blank;

[0078] (3) The green grinding wheel blank is placed into a graphite mold and sintered at 700°C for 20 minutes to obtain the grinding wheel blank;

[0079] (4) The above-mentioned grinding wheel blank is dressed in the inner and outer circles and ground in the plane so that the inner diameter, outer diameter, thickness and surface of the grinding wheel meet the requirements, thus obtaining the metal bond superhard grinding wheel.

[0080] Example of implementation effect 1

[0081] The performance of standard test strips prepared using the metal binders prepared in Example 1 and Comparative Examples 1-2 was tested, as follows:

[0082] Standard test strips (size: 50*8*8mm) were prepared using the metal binders from Example 1 and Comparative Examples 1-2. The specific method is as follows: The required metal binder powder was taken and placed into the corresponding sintering mold, sintered at 700℃ for 20 minutes, and then placed into the corresponding mold for a second heat treatment at 660℃ for 20 minutes in an argon atmosphere (the test strips from Comparative Examples 1 and 2 were not subjected to this second heat treatment). Density, hardness, and flexural strength were tested. Hardness was tested using a Rockwell hardness tester (reference standard GB / T230.1-2018), and flexural strength was tested using an electronic universal testing machine (reference standard GB / T14452-93). The test results are shown in Table 1. Figures 1 and 2 show the force-displacement curves of the bending tests of the test strips prepared using the metal binders from Example 1 and Comparative Example 1, respectively.

[0083] Table 1. Performance test results of standard test strips prepared with metal binders in Example 1 and Comparative Examples 1-2

[0084]

[0085] As can be seen from the data in Table 1, compared with the test strip of Comparative Example 1, the test strip of Example 1 has a very high hardness but a low strength, while the mechanical property data of Comparative Example 2 is between the two. Compared with Example 1 of CN112405376B, the test strip of Example 1 of the present invention has a significantly increased hardness while maintaining the same strength, which indirectly reflects that the binder of Example 1 of the present invention is more brittle. Compared with the curve of the test strip of Comparative Example 1, the curve of the test strip of Example 1 did not show obvious plastic deformation before fracture, and its fracture mode was brittle fracture. Figures 3 and 4 are macroscopic photographs of the fracture surfaces of the superhard grinding wheel (outer diameter 58 mm, inner hole 40 mm, thickness 0.2 mm) of Example 1 and Comparative Example 1, respectively. Similar to the test strip, compared with the fracture surface of the grinding wheel of Comparative Example 1, the grinding wheel of Example 1 did not show obvious plastic deformation at the fracture point, but rather brittle fracture. Figures 5 and 6 show the microstructure of the fracture surfaces of the superhard grinding wheels in Example 1 and Comparative Example 1, respectively (photographed using a scanning electron microscope). Microscopically, the fracture surface of the grinding wheel in Example 1 exhibits significant brittle cleavage characteristics and insufficient bond continuity, making it more prone to brittle spalling and granular wear. The grinding wheel using this bond does not cause workpiece dimensions to be substandard due to its own deformation. Furthermore, a comparison of the mechanical property data of Example 1 and Comparative Example 2 reveals that secondary heat treatment can further enhance the brittleness of the bronze-based metal bond.

[0086] Example 2 of implementation results

[0087] The metal-bonded superhard grinding wheels prepared in Example 1 and Comparative Example 1 were used for abrasion testing and cutting operations, as detailed below:

[0088] Wear test cutting operations were performed on the superhard grinding wheels of Example 1 and Comparative Example 1. The working platform was a professional dicing machine with a spindle speed of 35,000 rpm and a feed speed of 30 mm / s. The workpieces cut were GC500# dressing plates. The wear data of 100 cuts are shown in Table 2.

[0089] Table 2. Statistical data on wear from cutting with superhard grinding wheels in Example 1 and Comparative Example 1

[0090]

[0091] As shown in Table 2, the wear of the superhard grinding wheel prepared in Example 1 is increased compared with that of the superhard grinding wheel prepared in Comparative Example 1, which is consistent with its decrease in strength.

[0092] The superhard grinding wheel prepared in Example 1 was used for actual workpiece cutting. The cutting parameters were the same as above. The workpiece was a PCB board containing a copper metal frame. The cutting quality indicators are shown in Table 3.

[0093] Table 3 Cutting quality indicators of superhard grinding wheel in Example 1

[0094]

[0095] Figure 7 shows the surface condition of the cut workpiece. It can be seen that the copper extension and chipping on the workpiece surface after cutting are very slight. The cutting quality indicators and the surface condition of the workpiece after cutting using the superhard grinding wheel of Example 1 of this invention are similar to those of Example 1 in CN112405376B. Table 4 compares the cost of the metal binders prepared in Examples 1-5 of this invention with existing work (CN112405376B). In summary, the binder of this invention achieves higher brittleness and equivalent cutting quality while being significantly cheaper than existing work.

[0096] Table 4. Cost Comparison of the Metal Binder of the Present Invention and the Metal Binder Described in CN112405376B

[0097]

[0098] Figures 8 and 9 are photographs of the superhard grinding wheels prepared in Example 1 and Comparative Example 1 after cutting a dressing plate, respectively. Compared to the superhard grinding wheel prepared in Comparative Example 1, the superhard grinding wheel prepared in Example 1 did not show obvious corrosion after the cutting operation. Immersion corrosion tests were conducted on the superhard grinding wheels prepared in Example 1, Comparative Example 1, and Comparative Example 2 using an aqueous sodium chloride solution for 7 days. Photographs of the grinding wheels after immersion are shown in Figures 10 to 12. Compared to the grinding wheels in Comparative Example 1 and Comparative Example 2, the grinding wheel in Example 1 did not show obvious corrosion. These results show that the corrosion resistance of the metal binder prepared in Example 1 is significantly improved compared to ordinary bronze-based metal binders and the same formulation metal binder without secondary heat treatment. Figures 13 and 14 show the microscopic distribution of aluminum at the fracture surface of the superhard grinding wheels in Example 1 and Comparative Example 2. As can be seen in Example 1, the aluminum element is evenly distributed in the binder, which indicates that it forms a uniform and dense protective film on the grinding wheel, thereby improving the corrosion resistance of the binder and the grinding wheel; while in Comparative Example 2, the aluminum element is aggregated and concentrated in some areas in the binder. In this case, a uniform protective film cannot be formed, and the corrosion situation is not improved.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 brittle, corrosion-resistant metal binder, characterized in that, By weight, it includes the following raw materials: 50-70 parts copper powder, 5-20 parts tin powder, 5-15 parts graphite powder, and 15-20 parts improving additive powder.

2. The brittle corrosion-resistant metal binder according to claim 1, characterized in that: The copper powder and tin powder have a particle size of 230-800 mesh; the graphite powder has a particle size of 170-800 mesh.

3. The brittle corrosion-resistant metal binder according to claim 2, characterized in that: The improving additive powder is selected from at least one of aluminum powder, chromium powder and titanium powder, and the particle size of the improving additive powder is 230-800 mesh.

4. The method for preparing the brittle corrosion-resistant metal binder according to any one of claims 1-3, characterized in that, The process includes the following steps: sieving copper powder and tin powder and mixing them to obtain mixture A; sieving graphite powder and improving additive powder and mixing them with mixture A to obtain a brittle corrosion-resistant metal binder.

5. A metal-bonded superhard grinding wheel, characterized in that, By weight, it comprises 15-35 parts of diamond abrasive and 65-85 parts of the brittle corrosion-resistant metal binder as described in any one of claims 1-3.

6. The method for preparing the metal-bonded superhard grinding wheel according to claim 5, characterized in that, The process includes the following steps: (1) mixing diamond abrasive and brittle corrosion-resistant metal binder evenly to obtain a grinding wheel mixture, and then cold-pressing it to obtain a grinding wheel blank; (2) sintering the grinding wheel blank obtained in step (1), and then performing a secondary heat treatment to obtain a grinding wheel blank, which is then trimmed and ground to obtain a metal-bonded superhard grinding wheel.

7. The preparation method according to claim 6, characterized in that: In step (1), the diamond abrasive is titanium-plated diamond with a particle size of 200-1500 mesh.

8. The preparation method according to claim 7, characterized in that: The sintering temperature in step (2) is 700-850℃ and the time is 10-20min.

9. The preparation method according to claim 8, characterized in that: The temperature of the secondary heat treatment in step (2) is 660-700℃ and the time is 15-20min.

10. The application of the metal-bonded superhard grinding wheel of claim 5 in the cutting and processing of semiconductor packaging devices, ceramics and coated glass.

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