Wear-resistant steel ball and preparation method thereof

Abstract

The application relates to the technical field of steel parts, and particularly discloses a wear-resistant steel ball, which is characterized by comprising a steel ball and a wear-resistant layer wrapped on the surface of the steel ball; the steel ball comprises the following raw materials in parts by weight: planing iron 55-60 parts, pig iron 25-30 parts, chromium iron 10-13 parts, silicon iron 7-8 parts and manganese iron 3-5 parts; the wear-resistant layer comprises the following raw materials in parts by weight: 25-30 parts of polyamide composite resin, 100-120 parts of cyclohexane, 5-7 parts of modified glass fiber, 4-8 parts of modified nanometer diamond and 1-1.5 parts of phytic acid; in addition, the wear-resistant steel ball prepared by the application has the advantages of high strength and good wear resistance.

Description

Technical Field

[0001] This application relates to the field of steel technology, and more specifically, to a wear-resistant steel ball and a method for preparing the same. Background Technology

[0002] Steel balls are classified according to their manufacturing process into grinding steel balls, forged steel balls, and cast steel balls; and according to the material used, into bearing steel balls, stainless steel balls, carbon steel balls, copper bearing steel balls, alloy steel balls, etc. Grinding steel balls are mainly used in ball mills, which can perform dry or wet grinding of various ores and other grindable materials. Ball mills are primarily suitable for grinding various ores and other materials and are widely used in mineral processing, building materials, and chemical industries.

[0003] Steel balls, as the main grinding media in ball mills, play a crucial role in crushing and grinding materials during the production process. Because steel balls are required to crush and grind materials, prolonged use leads to significant wear on the balls, affecting the grinding effect. Therefore, there is an urgent need to develop steel balls with better wear resistance. Summary of the Invention

[0004] To improve the wear resistance of steel balls, this application provides a wear-resistant steel ball and its preparation method.

[0005] In a first aspect, this application provides a wear-resistant steel ball and a method for preparing the same, employing the following technical solution: Includes a steel ball and a wear-resistant layer wrapped around the surface of the steel ball; The steel ball comprises the following raw materials in parts by weight: 55-60 parts of shaving iron, 25-30 parts of pig iron, 10-13 parts of ferrochrome, 7-8 parts of ferrosilicon, and 3-5 parts of ferromanganese. The wear-resistant layer comprises the following raw materials in parts by weight: 25-30 parts polyamide composite resin, 100-120 parts cyclohexane, 5-7 parts modified glass fiber, 4-8 parts modified nanodiamond and 1-1.5 parts phytic acid.

[0006] By adopting the above technical solutions, the steel balls in this application incorporate ferrochrome during the preparation process. Chromium is a carbide-forming element. Cr melts into austenite to strengthen the matrix without reducing toughness, delays the transformation of supercooled austenite, and increases the hardenability of the steel balls. Cr significantly improves the strength and hardness of the steel balls. In addition, Cr can refine the grains and improve tempering stability. The steel balls in this application also incorporate ferromanganese during the preparation process. Manganese is an effective element for improving hardenability and expanding the austenite region. Its functions are deoxidation and strengthening the matrix and carbides, thereby increasing the hardness of the steel balls. The steel balls in this application also incorporate ferrosilicon during the preparation process. Ferrosilicon is an essential deoxidizer in the steelmaking industry, capable of precipitation deoxidation and diffusion deoxidation. Adding a certain amount of silicon to steel can significantly improve the strength, hardness, and elasticity of the steel. Therefore, the preparation process of the steel balls in this application uses different alloy combinations to improve the hardness of the steel balls, thereby improving their wear resistance. This application further coats the steel ball with a wear-resistant layer to enhance its wear resistance. The wear-resistant layer is prepared using polyamide composite resin as the matrix resin, primarily due to the good wear resistance, mechanical properties, and self-sliding properties of polyamide resin, as well as its strong adhesion to the steel matrix. This application modifies the polyamide resin to further improve its wear resistance and bonding with the steel ball matrix. Modified glass fiber and modified nanodiamond are used as reinforcing fillers in the polyamide composite resin. Glass fiber is a high-performance reinforcing fiber, and nanodiamond is a very hard nanoparticle. Nanodiamond can fill the gaps between glass fibers, connecting them to form a strong and robust three-dimensional skeleton, further improving the strength and wear resistance of the polyamide composite resin, thereby enhancing the strength and wear resistance of the steel ball. Phytic acid is also added to the wear-resistant layer. Phytic acid is a multi-toothed chelating agent containing a large number of hydroxyl and phosphate groups, which can form stable complexes with the metal matrix, further improving the bonding between the wear-resistant layer and the steel ball, thus enhancing the wear resistance of the wear-resistant layer. In summary, this application employs different alloy combinations to increase the hardness of the steel ball, thereby improving its wear resistance. Furthermore, this application uses polyamide composite resin as the wear-resistant layer and fills it with glass fiber and nanodiamond as reinforcing materials to further enhance the wear resistance of the steel ball. The wear-resistant layer also contains phytic acid, which can form a stable complex with the steel matrix, further improving the bonding between the wear-resistant layer and the steel ball.

[0007] Preferably, the mass ratio of the modified glass fiber to the modified nanodiamond is (5.5-6):(4.2-4.8).

[0008] By adopting the above technical solution, when the mass ratio of modified glass fiber to modified nanodiamond is (5.5-6):(4.2-4.8), the three-dimensional skeleton formed by the two is more stable and can further exert a synergistic effect to improve the wear resistance of steel balls.

[0009] Preferably, the polyamide composite resin comprises 10-20 parts of polytetrafluoroethylene resin, 1-3 parts of titanate coupling agent, and 80-100 parts of polyamide resin.

[0010] By adopting the above technical solution, this application uses polytetrafluoroethylene resin and titanate coupling agent to modify polyamide resin. The modification of polytetrafluoroethylene resin with polyamide resin can significantly improve the wear resistance of polyamide resin. The titanate coupling agent can improve the bonding between polytetrafluoroethylene resin and polyamide resin, as well as the bonding between the wear-resistant layer and the steel matrix. It can also improve the bonding between the resin system and glass fiber and inorganic fillers, making the formed three-dimensional skeleton more robust. The wear-resistant layer formed by the combination of the three has good mechanical properties and high strength.

[0011] Preferably, the mass ratio of the polytetrafluoroethylene resin, titanate coupling agent and polyamide resin is (15-18):(1-2):(85-90).

[0012] By adopting the above technical solution, the mass ratio of polytetrafluoroethylene resin, titanate coupling agent and polyamide resin within the above range can further exert a synergistic effect and further improve the wear resistance of the wear-resistant layer.

[0013] Preferably, the preparation method of the modified nanodiamond includes the following steps: dispersing nanodiamond in water to form a suspension with a mass fraction of 5-7%, and ultrasonically dispersing for 10-15 min; then adding methacryloxyethyltrimethylammonium chloride to the suspension, stirring at 40-50°C for 20-24 h, centrifuging at 4000-4200 r / min for 5-8 min, washing the precipitate 4-5 times, drying at 40-50°C for 20-24 h, and grinding to obtain the modified nanodiamond; wherein the weight ratio of methacryloxyethyltrimethylammonium chloride to nanodiamond is 1:(100-120).

[0014] By adopting the above technical solution, this application uses methacryloyloxyethyltrimethylammonium chloride as a modifier to modify nanodiamonds, thereby improving the dispersibility of nanodiamonds in the wear-resistant layer. At the same time, it improves the compatibility between the matrix resin, nanodiamonds, glass fiber and other components, thereby improving the mechanical properties and wear resistance of the wear-resistant layer.

[0015] Preferably, the steel ball load-bearing wear-resistant layer undergoes a pretreatment process before being applied, including the following steps: S1: Clean the metal surface with a 30-40% NaOH alkaline solution for 10-20 minutes, then remove it; S2: Use ultrasonic waves to remove oil from the metal surface. After the oil removal is complete, rinse the metal surface with clean water and remove it. S3: Then, activate the metal surface with 10-12% HCl for 1-2 minutes, rinse with water, remove and dry to obtain pretreated steel balls.

[0016] By adopting the above technical solution, this application uses the above steps to clean and activate the surface of the steel ball, which can enhance the bonding between the steel ball and the wear-resistant layer, thereby improving the wear resistance of the steel ball.

[0017] Preferably, the preparation of the modified glass fiber includes the following steps: S1: Take an aqueous ethanol solution with a concentration of 1-2% and γ-aminopropyltriethoxysilane to prepare a coupling agent KH550 solution. The mass ratio of the aqueous ethanol solution to γ-aminopropyltriethoxysilane is (50-100):1. S2: Add glass fiber to the coupling agent KH550 solution, soak for 0.2-2 hours, remove the glass fiber, dry it, and obtain modified glass fiber.

[0018] By adopting the above technical solution, this application uses γ-aminopropyltriethoxysilane to modify glass fiber, which can enhance the bonding between glass fiber and matrix resin and steel ball. In addition, γ-aminopropyltriethoxysilane can also be hydrolyzed to form silanol groups, which chemically bond with the hydroxyl groups on phytic acid, further improving the wear resistance of the wear-resistant layer.

[0019] Secondly, this application provides a method for preparing wear-resistant steel balls using the following technical solution: A method for preparing a wear-resistant steel ball includes the following steps: S1: Preparation of steel balls: Mix and melt shavings, pig iron, ferrochrome, ferrosilicon and ferromanganese, melt at a temperature of 1300-1500℃, then pour into a mold to form, the forming time is 10-20 minutes, and after natural cooling, steel balls are obtained. S2: Preparation of coating solution: Mix polyamide composite resin, modified glass fiber, cyclohexane, modified nanodiamond and phytic acid to obtain coating solution; S3: Preparation of wear-resistant steel balls: Immerse the steel balls in the coating solution, take them out, and cure them to obtain wear-resistant steel balls.

[0020] In summary, this application has the following beneficial effects: 1. This application uses different alloy combinations to improve the hardness of the steel ball, thereby improving its wear resistance. This application also uses polyamide composite resin as the wear-resistant layer and fills it with glass fiber and nano-diamond as reinforcing materials to further improve the wear resistance of the steel ball. The wear-resistant layer of this application also contains phytic acid, which is a multi-toothed chelating agent containing a large number of hydroxyl and phosphate groups, and can form a stable complex with the metal matrix to further improve the bonding between the wear-resistant layer and the steel ball.

[0021] 2. This application uses polytetrafluoroethylene resin and titanate coupling agent to modify polyamide resin. The modification of polytetrafluoroethylene resin with polyamide resin can significantly improve the wear resistance of polyamide resin. The titanate coupling agent can improve the bonding between polytetrafluoroethylene resin and polyamide resin, as well as the bonding between the wear-resistant layer and the steel matrix. It can also improve the bonding between the resin system and glass fiber and inorganic fillers, making the formed three-dimensional skeleton more robust. The wear-resistant layer formed by the combination of the three has good mechanical properties and high strength.

[0022] 3. This application uses γ-aminopropyltriethoxysilane to modify glass fiber, which can enhance the bonding between glass fiber and matrix resin and steel ball. In addition, γ-aminopropyltriethoxysilane can also be hydrolyzed to form silanol groups, which chemically bond with the hydroxyl groups on phytic acid, further improving the wear resistance of the wear-resistant layer.

[0023] Source of raw materials The nanodiamonds are from Zhengzhou Jinte Superhard Materials Co., Ltd., model W40; The glass fiber is alkali-free glass fiber with a length of 1-5mm; The titanate coupling agents are all from Xinke Chemical Technology Co., Ltd., model XK; Iron shavings, iron content 60%; Pig iron, with an iron content of 95%; Ferrosilicon, with an average particle size of 1-3 mm and a silicon content of 75%; Ferromanganese, with an average particle size of 10-20 mm and a manganese content of 40%; Ferrochrome, with an average particle size of 1-3 mm and a chromium content of 50%; Phytic acid is sourced from Huangshan Xingcheng Phytic Acid Co., Ltd. The polytetrafluoroethylene resin is from Suzhou Dianhui Plastic Raw Materials Co., Ltd., brand name DF-331Z; The polyamide resin is from DuPont, USA, and its brand name is STS01. Detailed Implementation

[0024] The present application will be further described in detail below with reference to preparation examples and embodiments.

[0025] Preparation Example Preparation of modified nanodiamond Preparation Example 1.1 10 kg of nanodiamonds were dispersed in water to prepare a 5% (w / w) suspension, and ultrasonically dispersed for 10 min. Then, 0.1 kg of methacryloyloxyethyltrimethylammonium chloride was added to the suspension, and the mixture was stirred at 40 °C for 20 h. After that, it was centrifuged at 4000 r / min for 5 min, and the precipitate was washed 4 times. Then, it was dried at 40 °C for 20 h and ground to obtain modified nanodiamonds.

[0026] Preparation Example 1.2 11 kg of nanodiamonds were dispersed in water to prepare a suspension with a mass fraction of 6%, and ultrasonically dispersed for 12 min. Then, 0.1 kg of methacryloyloxyethyltrimethylammonium chloride was added to the suspension, and the mixture was stirred at 45 °C for 22 h. After that, it was centrifuged at 4100 r / min for 7 min. The precipitate was then washed 4 times, dried at 45 °C for 22 h, and ground to obtain modified nanodiamonds.

[0027] Preparation Example 1.3 12 kg of nanodiamonds were dispersed in water to prepare a suspension with a mass fraction of 7%, and ultrasonically dispersed for 15 min. Then, 0.1 kg of methacryloyloxyethyltrimethylammonium chloride was added to the suspension, and the mixture was stirred at 50 °C for 24 h. After that, it was centrifuged at 4200 r / min for 8 min. The precipitate was washed 5 times, dried at 50 °C for 24 h, and then ground to obtain modified nanodiamonds.

[0028] Preparation of modified glass fiber Preparation Example 2.1 The preparation of modified glass fibers includes the following steps: S1: Take 50 kg of 1% ethanol aqueous solution and 1 kg of γ-aminopropyltriethoxysilane, and mix them to prepare coupling agent KH550 solution; S2: Add glass fiber to the coupling agent KH550 solution, soak for 0.2 h, remove the glass fiber, dry it, and obtain modified glass fiber.

[0029] Preparation Example 2.2 The preparation of modified glass fibers includes the following steps: S1: Take 75 kg of 1.5% ethanol aqueous solution and 1 kg of γ-aminopropyltriethoxysilane, mix them to prepare coupling agent KH550 solution; S2: Add glass fiber to the coupling agent KH550 solution, soak for 1 hour, remove the glass fiber, dry it, and obtain modified glass fiber.

[0030] Preparation Example 2.3 The preparation of modified glass fibers includes the following steps: S1: Take 100 kg of 2% ethanol aqueous solution and 1 kg of γ-aminopropyltriethoxysilane, and mix them to prepare coupling agent KH550 solution; S2: Add glass fiber to the coupling agent KH550 solution, soak for 2 hours, remove the glass fiber, dry it, and obtain modified glass fiber.

[0031] Preparation Example 2.4 The difference between Preparation Example 2.4 and Preparation Example 2.3 is that γ-aminopropyltriethoxysilane is replaced with a titanate coupling agent, while the other steps are the same as those in Preparation Example 2.3. Example

[0032] Example 1 A method for preparing a wear-resistant steel ball includes the following steps: S1: Preparation of steel balls: Mix and melt 55kg of shaving iron, 25kg of pig iron, 10kg of ferrochrome, 7kg of ferrosilicon and 3kg of ferromanganese, place the melting temperature at 1300℃, then pour it into a mold to form it. The forming time is 10 minutes. After natural cooling, steel balls are obtained. S2: Preparation of coating solution: Mix 25kg polyamide composite resin, 100kg cyclohexane, 5kg modified glass fiber, 4kg modified nanodiamond and 1kg phytic acid to obtain the coating solution; S3: Preparation of wear-resistant steel balls: Immerse the steel balls in the coating solution, take them out, and cure them to obtain wear-resistant steel balls; The polyamide composite resin includes 3.71 kg of polytetrafluoroethylene resin, 0.25 kg of titanate coupling agent, and 21.04 kg of polyamide resin. The modified nanodiamond was derived from Preparation Example 1.1, and the modified glass fiber was derived from Preparation Example 2.1.

[0033] Example 2 A method for preparing a wear-resistant steel ball includes the following steps: S1: Preparation of steel balls: Mix and melt 57kg of shavings, 27kg of pig iron, 11kg of ferrochrome, 7.5kg of ferrosilicon, and 4kg of ferromanganese at 1400℃, then pour the mixture into a mold for 15 minutes. After natural cooling, steel balls are obtained. S2: Preparation of coating solution: Mix 28kg of polyamide composite resin, 110kg of cyclohexane, 6kg of modified glass fiber, 6kg of modified nanodiamond, and 1.2kg of phytic acid to obtain the coating solution. S3: Preparation of wear-resistant steel balls: Immerse the steel balls in the coating solution, take them out, and cure them to obtain wear-resistant steel balls; The polyamide composite resin includes 4.16 kg of polytetrafluoroethylene resin, 0.28 kg of titanate coupling agent, and 23.56 kg of polyamide resin. The modified nanodiamond was derived from Preparation Example 1.1, and the modified glass fiber was derived from Preparation Example 2.1.

[0034] Example 3 A method for preparing a wear-resistant steel ball includes the following steps: S1: Preparation of steel balls: Mix and melt 60kg of shaving iron, 30kg of pig iron, 13kg of ferrochrome, 8kg of ferrosilicon and 5kg of ferromanganese, place the melting temperature at 1500℃, then pour it into a mold to form it. The forming time is 20min. After natural cooling, steel balls are obtained. S2: Preparation of coating solution: Mix 30kg polyamide composite resin, 120kg cyclohexane, 7kg modified glass fiber, 8kg modified nanodiamond and 1.5kg phytic acid to obtain the coating solution; S3: Preparation of wear-resistant steel balls: Immerse the steel balls in the coating solution, take them out, and cure them to obtain wear-resistant steel balls; The polyamide composite resin includes 4.45 kg of polytetrafluoroethylene resin, 0.3 kg of titanate coupling agent, and 25.25 kg of polyamide resin. The modified nanodiamond was derived from Preparation Example 1.1, and the modified glass fiber was derived from Preparation Example 2.1.

[0035] Example 4 The difference between Example 4 and Example 3 is that the steel ball is pretreated before coating, including the following steps: S1: Clean the metal surface with a 30% NaOH alkaline solution for 10 minutes, and then remove it; S2: Use ultrasonic waves to remove oil from the metal surface. After the oil removal is complete, rinse the metal surface with clean water and remove it. S3: Then, activate the metal surface with 10% HCl for 1 minute, rinse with water, remove and dry to obtain pretreated steel balls.

[0036] Example 5 The difference between Example 5 and Example 3 is that the steel ball is pretreated before coating, including the following steps: S1: Clean the metal surface with a 35% NaOH alkaline solution for 15 minutes, and then remove it; S2: Use ultrasonic waves to remove oil from the metal surface. After the oil removal is complete, rinse the metal surface with clean water and remove it. S3: Then, activate the metal surface with 11% HCl for 1.5 minutes, rinse with water, remove and dry to obtain pretreated steel balls.

[0037] Example 6 The difference between Example 6 and Example 3 is that the steel ball is pretreated before coating, including the following steps: S1: Clean the metal surface with a 40% NaOH alkaline solution for 20 minutes, and then remove it; S2: Use ultrasonic waves to remove oil from the metal surface. After the oil removal is complete, rinse the metal surface with clean water and remove it. S3: Then, activate the metal surface with 12% HCl for 2 minutes, rinse with water, remove and dry to obtain pretreated steel balls.

[0038] Examples 7-11 The difference between Examples 7-11 and Example 5 lies in the mass and mass ratio of the modified glass fiber and modified nanodiamond, as shown in the table below: Table 1. Mass and mass ratio of modified glass fiber and modified nanodiamond in Examples 7-11. Examples 12-15 The difference between Examples 12-15 and Example 9 lies in the mass and mass ratio of polytetrafluoroethylene resin, titanate coupling agent, and polyamide resin in the polyamide composite resin. Specific data are shown in the table below: Table 2. Mass of each component in the polyamide composite resin in Examples 12-15 Examples 16-17 The difference between Examples 16-17 and Example 13 is that the modified nanodiamonds were derived from Preparation Examples 1.2 and 1.3 respectively, while the remaining steps were the same as in Example 13.

[0039] Examples 18-20 The difference between Examples 18-20 and Example 16 is that the modified glass fibers were derived from Preparation Examples 2.2, 2.3 and 2.4 respectively, while the remaining steps were the same as in Example 13.

[0040] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that no ferrochrome, ferrosilicon, and ferromanganese were added during the preparation of the steel balls, while the remaining steps were the same as in Example 1.

[0041] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the surface of the steel ball is not covered with a wear-resistant layer, while the rest of the steps are the same as in Example 1.

[0042] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the polyamide resin was not modified, while the rest of the steps were the same as in Example 1.

[0043] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modified glass fiber was replaced with an equal weight of modified nanodiamonds, while the rest of the steps were the same as in Example 1.

[0044] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that the modified nanodiamonds were replaced with an equal weight of modified glass fibers, while the rest of the steps were the same as in Example 1.

[0045] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that the nanodiamond was not modified, while the other steps were the same as in Example 1.

[0046] Comparative Example 7 The difference between Comparative Example 7 and Example 1 is that the glass fiber was not modified, while the rest of the steps were the same as in Example 1.

[0047] Performance testing The wear resistance of the wear-resistant steel balls in Examples 1-20 and Comparative Examples 1-7 was tested as follows: Rockwell hardness: The hardness of the steel ball is determined according to GB / T230.1-2004 "Metallic materials - Rockwell hardness test - Part 1: Test method".

[0048] Wear resistance: The wear resistance of the steel ball was determined according to GB / T12444.1-1990 "Metal Wear Test Methods MM Type Wear Test". The test results are shown in the table below.

[0049] Table 3. Wear data of wear-resistant steel balls in Examples 1-20 and Comparative Examples 1-7. The steel balls without wear-resistant coating prepared in the embodiments of this application all have a Rockwell hardness of 70 and high strength; Based on the data from Examples 1-3 and Table 3, it can be seen that the wear-resistant steel ball prepared in Example 3 has better wear resistance. Based on the data from Examples 3-6 and Table 3, it can be seen that cleaning and activating the surface of the steel ball can enhance the bonding between the steel ball and the wear-resistant layer, thereby improving the wear resistance of the steel ball. Based on the data from Examples 5, 7-11, and Table 3, it can be seen that when the mass ratio of modified glass fiber to modified nanodiamond is (5.5-6):(4.2-4.8), the three-dimensional skeleton formed by the two is more stable and can further exert a synergistic effect to improve the wear resistance of the steel ball. Based on the data from Examples 9, 12-15, and Table 3, it can be seen that when the mass ratio of polytetrafluoroethylene resin, titanate coupling agent, and polyamide resin is within a specific range, they can further exert a synergistic effect and further improve the wear resistance of the wear-resistant layer. Based on the data from Examples 13, 16-17 and Table 3, it can be seen that the modified nanodiamonds prepared in Examples 1.1-1.3 all have good dispersion effects in the resin system, resulting in good wear resistance of the prepared wear-resistant steel balls. Based on the data from Examples 16, 18-20, and Table 3, it can be seen that γ-aminopropyltriethoxysilane has a better effect on modifying glass fibers. This may be because, in addition to enhancing the bonding between glass fibers and matrix resin and steel balls, γ-aminopropyltriethoxysilane can also hydrolyze to form silanol groups. These silanol groups then chemically bond with the hydroxyl groups on phytic acid, further improving the wear resistance of the wear-resistant layer. Based on the data from Example 1, Comparative Example 1, and Table 3, it can be seen that adding ferrochrome, ferromanganese, and ferrosilicon during the preparation of the steel balls in this application can significantly improve the hardness of the steel balls, thereby improving their wear resistance. Based on the data from Example 1, Comparative Example 2, and Table 3, it can be seen that the wear-resistant layer prepared in this application has a good wear-resistant effect and can significantly improve the wear resistance of the steel ball. Based on the data from Example 1, Comparative Example 3, and Table 3, it can be seen that the present application uses polytetrafluoroethylene resin and titanate coupling agent to modify polyamide resin, which can significantly improve the wear resistance of polyamide resin. The titanate coupling agent can improve the bonding between polytetrafluoroethylene resin and polyamide resin, as well as the bonding between the wear-resistant layer and the steel matrix, and also improve the bonding between the resin system and glass fiber and inorganic filler, making the formed three-dimensional skeleton more robust. The wear-resistant layer formed by the combination of the three has good mechanical properties and high strength. Based on the data from Example 1, Comparative Examples 4-5, and Table 3, it can be seen that this application uses modified glass fiber and modified nanodiamond as reinforcing fillers in polyamide composite resin. The two work together to form a strong and robust three-dimensional skeleton, further improving the wear resistance of polyamide composite resin, thereby improving the wear resistance of steel balls. Based on the data from Example 1, Comparative Example 6, and Table 3, it can be seen that this application uses methacryloyloxyethyltrimethylammonium chloride as a modifier to modify nanodiamonds, which improves the dispersibility of nanodiamonds in the wear-resistant layer. At the same time, it improves the compatibility between the matrix resin, nanodiamonds, glass fiber, and other components, thereby improving the mechanical properties and wear resistance of the wear-resistant layer. Based on the data from Example 1, Comparative Example 7, and Table 3, it can be seen that the glass fiber modified with γ-aminopropyltriethoxysilane in this application can enhance the bonding between the glass fiber and the matrix resin and the steel ball. In addition, γ-aminopropyltriethoxysilane can also be hydrolyzed to form silanol groups, which chemically bond with the hydroxyl groups on phytic acid, further improving the wear resistance of the wear-resistant layer.

[0050] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A wear-resistant steel ball, characterized in that, Includes a steel ball and a wear-resistant layer wrapped around the surface of the steel ball; The steel ball comprises the following raw materials in parts by weight: 55-60 parts of shaving iron, 25-30 parts of pig iron, 10-13 parts of ferrochrome, 7-8 parts of ferrosilicon, and 3-5 parts of ferromanganese. The wear-resistant layer comprises the following raw materials in parts by weight: 25-30 parts polyamide composite resin, 100-120 parts cyclohexane, 5-7 parts modified glass fiber, 4-8 parts modified nanodiamond and 1-1.5 parts phytic acid; The polyamide composite resin comprises 10-20 parts of polytetrafluoroethylene resin, 1-3 parts of titanate coupling agent, and 80-100 parts of polyamide resin.

2. The wear-resistant steel ball according to claim 1, characterized in that: The mass ratio of the modified glass fiber to the modified nanodiamond is (5.5-6):(4.2-4.8).

3. The wear-resistant steel ball according to claim 1, characterized in that: The mass ratio of the polytetrafluoroethylene resin, titanate coupling agent and polyamide resin is (15-18):(1-2):(85-90).

4. The wear-resistant steel ball according to claim 1, characterized in that: The method for preparing the modified nanodiamond includes the following steps: dispersing nanodiamond in water to form a suspension with a mass fraction of 5-7%, and ultrasonically dispersing for 10-15 min; then adding methacryloyloxyethyltrimethylammonium chloride to the suspension, stirring at 40-50℃ for 20-24 h, centrifuging at 4000-4200 r / min for 5-8 min, washing the precipitate 4-5 times, drying at 40-50℃ for 20-24 h, and grinding to obtain the modified nanodiamond; wherein the weight ratio of methacryloyloxyethyltrimethylammonium chloride to nanodiamond is 1:(100-120).

5. The wear-resistant steel ball according to claim 1, characterized in that: Before the steel ball load-bearing wear-resistant layer is formed, it undergoes a pretreatment process, including the following steps: S1: Clean the metal surface with a 30-40% NaOH alkaline solution for 10-20 minutes, then remove it; S2: Use ultrasonic waves to remove oil from the metal surface. After the oil removal is complete, rinse the metal surface with clean water and remove it. S3: Then, activate the metal surface with 10-12% HCl for 1-2 minutes, rinse with water, remove and dry to obtain pretreated steel balls.

6. The wear-resistant steel ball according to claim 1, characterized in that: The preparation of the modified glass fiber includes the following steps: S1: Take an aqueous ethanol solution with a concentration of 1-2% and γ-aminopropyltriethoxysilane to prepare a coupling agent KH550 solution. The mass ratio of the aqueous ethanol solution to γ-aminopropyltriethoxysilane is (50-100):

1. S2: Add glass fiber to the coupling agent KH550 solution, soak for 0.2-2 hours, remove the glass fiber, dry it, and obtain modified glass fiber.

7. A method for preparing a wear-resistant steel ball as described in any one of claims 1-6, characterized in that: Includes the following steps: S1: Preparation of steel balls: Mix and melt shavings, pig iron, ferrochrome, ferrosilicon and ferromanganese, melt at a temperature of 1300-1500℃, then pour into a mold to form, the forming time is 10-20 minutes, and after natural cooling, steel balls are obtained. S2: Preparation of coating solution: Mix polyamide composite resin, modified glass fiber, cyclohexane, modified nanodiamond and phytic acid to obtain coating solution; S3: Preparation of wear-resistant steel balls: Immerse the steel balls in the coating solution, take them out, and cure them to obtain wear-resistant steel balls.

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