Metal binding agent and method for its preparation

Abstract

The application relates to the technical field of binding agents, and discloses a metal binding agent and a preparation method thereof.A metal binding agent is prepared from the following raw materials: titanium powder composite copper-tin alloy powder, cobalt-chromium-tungsten alloy powder, silver powder and iron powder.Through the technical scheme, the problem that the diamond surface is not easily infiltrated by the metal binding agent in the related art, leading to the diamond particles being prone to falling off during the working process and reducing the service life is solved.

Description

Technical Field

[0001] This invention relates to the field of binder technology, specifically to a metal binder and its preparation method. Background Technology

[0002] Metal binders play a crucial role in the field of diamond tools, particularly in diamond inserts and diamond grinding wheels. In the manufacturing process of diamond inserts, metal binders are used to fix the diamond particles, enabling them to maintain a stable shape during high-speed rotation.

[0003] Compared with resin-bonded, ceramic-bonded, and rubber-bonded diamond tools, those made with metal bonds have higher strength and rigidity and can withstand greater cutting loads. Therefore, metal bonds are more widely used.

[0004] Traditional metal binders are generally composed of single components or alloys of various metals such as copper, tin, silver, iron, cobalt, and tungsten. In diamond tools, diamond is a non-metal, and its high interfacial energy with metals or alloys makes it difficult for the diamond surface to be wetted by the metal binder. This causes diamond particles to easily detach during operation, reducing the tool's lifespan. Summary of the Invention

[0005] This invention proposes a metal binder and its preparation method, which solves the problem in related technologies that the diamond surface is not easily wetted by the metal binder, causing diamond particles to easily fall off during operation and reducing service life.

[0006] The technical solution of the present invention is as follows: A metal binder, the raw materials of which include the following components: titanium powder composite copper-tin alloy powder, cobalt-chromium-tungsten alloy powder, silver powder, and iron powder.

[0007] As a further technical solution, the mass ratio of the titanium powder composite copper-tin alloy powder, cobalt-chromium-tungsten alloy powder, silver powder, and iron powder is 40~50:10~15:10:15.

[0008] As a further technical solution, the raw materials for the titanium powder composite copper-tin alloy powder include titanium powder and copper-tin alloy powder in a mass ratio of 1~3:20.

[0009] As a further technical solution, the titanium powder is nano-sized titanium powder.

[0010] As a further technical solution, the particle size of the titanium powder is 40~50nm.

[0011] As a further technical solution, the copper-tin alloy powder is a micron-sized copper-tin alloy powder.

[0012] As a further technical solution, the particle size of the copper-tin alloy powder is 200~500 mesh.

[0013] As a further technical solution, the preparation method of the titanium powder composite copper-tin alloy powder includes the following steps: mixing titanium powder and copper-tin alloy powder, and then ball milling to obtain titanium powder composite copper-tin alloy powder.

[0014] As a further technical solution, the ball milling is carried out under inert gas protection, the forward rotation speed of the ball mill is 400~500 rpm, the reverse rotation speed of the ball mill is 400~500 rpm, and the forward and reverse rotations are alternated every 30~180 minutes.

[0015] As a further technical solution, the titanium powder in the titanium powder composite copper-tin alloy powder includes epoxy-siloxane modified titanium powder and phenylsiloxane modified titanium powder in a mass ratio of 2~4:1.

[0016] In this invention, the combined use of epoxy-siloxane-modified titanium powder and phenylsiloxane-modified titanium powder not only improves the dispersibility of the titanium powder but, more importantly, makes the diamond more easily wetted by the metal binder. This is because, to enable the diamond to be wetted by the metal binder, this invention first pre-treats the diamond with a wetting agent. Based on this, the invention further uses epoxy-siloxane-modified and phenylsiloxane-modified titanium powders. Through the interaction between the modified titanium powder and the wetting agent on the diamond surface, the diamond is more easily wetted by the metal binder, making it less likely for the diamond particles to detach.

[0017] As a further technical solution, the raw materials for the epoxy-siloxane modified titanium powder include epoxy-siloxane and titanium powder in a mass ratio of 1~2:20.

[0018] As a further technical solution, the epoxy siloxane includes one or both of silane coupling agents KH-560 and KH-78.

[0019] As a further technical solution, the preparation method of the epoxy-siloxane modified titanium powder includes the following steps: adding epoxy-siloxane to an ethanol solution while stirring, hydrolyzing, adding titanium powder for modification, washing the product, drying, and obtaining epoxy-siloxane modified titanium powder.

[0020] As a further technical solution, the raw materials for the phenylsiloxane-modified titanium powder include phenylsiloxane and titanium powder in a mass ratio of 1~2:20.

[0021] As a further technical solution, the phenylsiloxane includes one or both of phenyltrimethoxysilane and phenyltriethoxysilane.

[0022] As a further technical solution, the preparation method of the phenylsiloxane modified titanium powder includes the following steps: adding phenylsiloxane to an ethanol solution while stirring, hydrolyzing it, adding titanium powder for modification, washing the product, drying it, and obtaining phenylsiloxane modified titanium powder.

[0023] The present invention also proposes a method for preparing a metal binder, wherein the raw materials are mixed evenly to obtain the metal binder.

[0024] The present invention also proposes a diamond tool comprising diamond and a metal binder, wherein the metal binder is the metal binder described above or a metal binder prepared by the preparation method described above.

[0025] As a further technical solution, the diamond is obtained by wetting diamond micro powder with a wetting agent; the wetting agent includes polyvinyl alcohol, phenolic ether surfactant and water in a mass ratio of 1.5:5~10:100.

[0026] The working principle and beneficial effects of this invention are as follows: In this invention, after copper-tin alloy powder is compounded with titanium powder, the presence of titanium powder acts as an intermediate bridge, which improves the wettability of copper-tin alloy powder on diamond, thereby improving the wettability of metal binder on diamond and the bonding performance of metal binder on diamond. This makes diamond particles less likely to fall off, significantly improving the service life of diamond tools. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the following embodiments and comparative examples: Copper-tin alloy powder: The mass ratio of copper to tin is 9:1; Cobalt-chromium-tungsten alloy powder: 500 mesh particle size, grade Hastelloy C-22, purchased from Jiangsu Tianhong Hastelloy Co., Ltd. Silver powder: 800 mesh particle size; Iron powder: particle size 1000 mesh; Diamond is obtained by wetting diamond powder (325 mesh) with a wetting agent; The wetting agent is composed of polyvinyl alcohol, octylphenol polyoxyethylene ether and water in a mass ratio of 1.5:6:100. Polyvinyl alcohol is industrial grade polyvinyl alcohol PVA 1788; The polyoxyethylene ether of octanoic acid, model number SOPE-15, was purchased from Shanghai Banggao Chemical Co., Ltd.

[0029] Example 1 Titanium powder (40nm) and copper-tin alloy powder (500 mesh) were mixed at a mass ratio of 1:20, and then zirconium balls were added and ball-milled for 120 minutes. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 400 rpm and the reverse rotation speed was 400 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 30 minutes, so as to obtain titanium powder composite copper-tin alloy powder. By weight, 50 parts of titanium powder composite copper-tin alloy powder, 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0030] Example 2 Titanium powder (50 nm) and copper-tin alloy powder (200 mesh) were mixed at a mass ratio of 3:20, and then zirconium balls were added and ball-milled for 360 min. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 500 rpm, and the reverse rotation speed was 500 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 180 min, so as to obtain titanium powder composite copper-tin alloy powder. By weight, 40 parts of titanium powder composite copper-tin alloy powder, 10 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0031] Example 3 By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 10 parts of KH-560 were added to the ethanol solution. After stirring and hydrolyzing for 40 min, 100 parts of titanium powder (40 nm) were added and stirred at 40 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain epoxy siloxane modified titanium powder. By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 10 parts of phenyltrimethoxysilane were added to the ethanol solution. After stirring and hydrolyzing for 40 min, 100 parts of titanium powder (40 nm) were added and stirred at 40 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain phenylsiloxane modified titanium powder. Titanium powder (composed of epoxy-siloxane modified titanium powder and phenylsiloxane modified titanium powder with a mass ratio of 2:1) and copper-tin alloy powder (500 mesh) were mixed at a mass ratio of 1:20. Zirconium balls were added and the mixture was ball-milled for 120 min. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 400 rpm and the reverse rotation speed was 400 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 30 min, so as to obtain titanium powder composite copper-tin alloy powder. By weight, 50 parts of titanium powder composite copper-tin alloy powder, 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0032] Example 4 By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 5 parts of KH-78 were added to the ethanol solution. After stirring and hydrolyzing for 30 min, 100 parts of titanium powder (50 nm) were added and stirred at 35 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain epoxy siloxane modified titanium powder. By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 5 parts of phenyltriethoxysilane were added to the ethanol solution. After stirring and hydrolyzing for 30 min, 100 parts of titanium powder (50 nm) were added and stirred at 35 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain phenylsiloxane modified titanium powder. Titanium powder (composed of epoxy-siloxane modified titanium powder and phenylsiloxane modified titanium powder with a mass ratio of 4:1) and copper-tin alloy powder (200 mesh) were mixed at a mass ratio of 3:20. Zirconium balls were added and the mixture was ball-milled for 360 min. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 500 rpm and the reverse rotation speed was 500 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 180 min, thus obtaining titanium powder composite copper-tin alloy powder. By weight, 40 parts of titanium powder composite copper-tin alloy powder, 10 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0033] Example 5 By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 10 parts of KH-560 were added to the ethanol solution. After stirring and hydrolyzing for 40 min, 100 parts of titanium powder (40 nm) were added and stirred at 40 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain epoxy siloxane modified titanium powder. Epoxysiloxane modified titanium powder and copper-tin alloy powder (500 mesh) were mixed at a mass ratio of 1:20, and then zirconium balls were added and ball-milled for 120 min. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 400 rpm and the reverse rotation speed was 400 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 30 min, so as to obtain titanium powder composite copper-tin alloy powder. By weight, 50 parts of titanium powder composite copper-tin alloy powder, 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0034] Example 6 By mass, 50 parts of anhydrous ethanol and 50 parts of water were mixed to obtain an ethanol solution. While stirring, 10 parts of phenyltrimethoxysilane were added to the ethanol solution. After stirring and hydrolyzing for 40 min, 100 parts of titanium powder (40 nm) were added and stirred at 40 °C for 3 h. The product was washed with anhydrous ethanol and dried to obtain phenylsiloxane modified titanium powder. Phenylsiloxane-modified titanium powder and copper-tin alloy powder (500 mesh) were mixed at a mass ratio of 1:20, and then zirconium balls were added and ball-milled for 120 min. The mass ratio of zirconium balls to raw materials was 10:1. The ball milling was carried out under inert gas protection. The forward rotation speed of the ball mill was 400 rpm and the reverse rotation speed was 400 rpm. The forward and reverse rotation were alternated, and the time for each forward and reverse rotation was 30 min, so as to obtain titanium powder composite copper-tin alloy powder. By weight, 50 parts of titanium powder composite copper-tin alloy powder, 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0035] Comparative Example 1 By weight, 50 parts of titanium powder-copper-tin alloy powder mixture (obtained by mixing 40nm titanium powder and 500-mesh copper-tin alloy powder at a mass ratio of 1:20), 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0036] Comparative Example 2 By weight, 50 parts of 500-mesh copper-tin alloy powder, 15 parts of cobalt-chromium-tungsten alloy powder, 10 parts of silver powder, and 15 parts of iron powder are mixed evenly to obtain a metal binder.

[0037] Application example: After the metal binder and diamond are mixed evenly at a mass ratio of 8:1, the mixture is transferred to a mold and sintered at 820℃ and 30MPa for 1 hour to obtain a diamond cutting tool.

[0038] Performance testing: The diamond cutting tool was subjected to friction and wear tests using an MMW-1A friction and wear tester. The final test results are recorded in Table 1. The final test result is the average of the results of the three test samples.

[0039] The grinding media was made of 45 steel. The test force was 300 N, the loading speed was 10 N / s, the rotation speed was 300 r / min, and the time was 30 min. The wear of the diamond cutting tool was tested.

[0040] Table 1 Performance Test Results

[0041] As can be seen from Table 1, the wear of diamond cutting tools made with the metal binder provided by the present invention is less than 2.1 mg, indicating that the metal binder provided by the present invention, which combines copper-tin alloy powder with titanium powder, has good bonding properties to diamond, making diamond particles less likely to fall off and significantly improving the service life of diamond tools.

[0042] The above are merely preferred embodiments of the present invention and are 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 metal binder, characterized in that, The raw materials include the following components: titanium powder composite copper-tin alloy powder, cobalt-chromium-tungsten alloy powder, silver powder, and iron powder.

2. The metal binder according to claim 1, characterized in that, The raw materials for the titanium powder composite copper-tin alloy powder include titanium powder and copper-tin alloy powder in a mass ratio of 1~3:

20.

3. The metal binder according to claim 2, characterized in that, The titanium powder is nano-sized titanium powder.

4. A metal binder according to claim 3, characterized in that, The titanium powder has a particle size of 40~50nm.

5. A metal binder according to claim 2, characterized in that, The copper-tin alloy powder is a micron-sized copper-tin alloy powder.

6. A metal binder according to claim 5, characterized in that, The copper-tin alloy powder has a particle size of 200-500 mesh.

7. A metal binder according to claim 1, characterized in that, The preparation method of the titanium powder composite copper-tin alloy powder includes the following steps: mixing titanium powder and copper-tin alloy powder, and then ball milling to obtain titanium powder composite copper-tin alloy powder.

8. A metal binder according to claim 1, characterized in that, The titanium powder in the titanium powder composite copper-tin alloy powder includes epoxy-siloxane modified titanium powder and phenylsiloxane modified titanium powder in a mass ratio of 2~4:

1.

9. A method for preparing a metal binder, used to prepare the metal binder according to any one of claims 1 to 8, characterized in that, The raw materials are mixed evenly to obtain a metal binder.

10. A diamond tool, characterized in that, It includes diamond and a metal binder, wherein the metal binder is the metal binder according to any one of claims 1 to 8 or the metal binder prepared by the preparation method according to claim 9.

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