A composite nano-coating for the surface of a diamond saw blade

Abstract

The application discloses a kind of diamond saw blade surface composite nano coating, it is related to diamond coating technical field, the composite nano coating includes bottom layer and phosphate composite layer;The bottom layer material raw material includes 71-83% titanium carbide, 15-25% tungsten carbide, 2-4% yttrium oxide according to mass percentage;The phosphate composite layer material raw material includes 5-10% phosphate binder, 8-14% alumina, 10-20% silicon carbide, 10-20% cerium-doped nano SiO2-BNNSs hybrid material, 5-10% graphene load molybdenum disulfide nanoparticles, the balance is water;Bottom layer material is coated on diamond saw blade surface by laser cladding process to form bottom layer, then phosphate reinforcing layer material is coated on bottom layer, i.e. diamond saw blade surface composite nano coating is obtained.The diamond saw blade surface composite nano coating provided in the application has very strong high temperature resistance, wear resistance.

Description

Technical Field

[0001] This application relates to the field of diamond coating technology, and more particularly to a composite nanocoating on the surface of a diamond saw blade. Background Technology

[0002] A saw blade is a tool used for cutting materials, with sharp cutting edges, and is widely used in industries such as construction, woodworking, metalworking, and stone cutting. Diamond saw blades are particularly favored due to their superior performance. The cutting edge of this type of saw blade is embedded with diamond particles, and diamond, as one of the hardest materials in nature, possesses extremely high hardness and wear resistance. Therefore, diamond saw blades can efficiently cut various hard materials, such as stone, concrete, ceramics, and metals.

[0003] However, despite the excellent hardness and wear resistance of diamond saw blades, they still face many challenges in practical use. Especially under extreme conditions of high speed, high temperature, and high friction, frictional heat can induce thermal stress in the material, leading to wear, deformation, and even cracking of the diamond saw blade. These problems not only reduce cutting efficiency but may also shorten the blade's service life. Therefore, to further improve its wear resistance and thermal stability and extend its service life, it is urgent to develop a composite nano-coating for the surface protection of diamond saw blades. Summary of the Invention

[0004] In order to provide a high-performance coating that is resistant to high temperatures and wear for use on the surface of diamond saw blades, this application provides a composite nano-coating for the surface of diamond saw blades.

[0005] This application provides a composite nano-coating for the surface of a diamond saw blade, employing the following technical solution:

[0006] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0007] The underlying material comprises, by mass percentage, 71-83% titanium carbide, 15-25% tungsten carbide, and 2-4% yttrium oxide;

[0008] The raw materials of the phosphate composite layer material include, by mass percentage, 5-10% phosphate binder, 8-14% alumina, 10-20% silicon carbide, 10-20% cerium-doped nano-SiO2-BNNSs hybrid material, 5-10% graphene-supported molybdenum disulfide nanoparticles, and the balance being water.

[0009] The bottom layer material is coated onto the surface of the diamond saw blade using a laser cladding process to form the bottom layer. Then, a phosphate reinforcing layer material is coated onto the bottom layer to obtain a composite nano-coating on the surface of the diamond saw blade.

[0010] Preferably, the underlying material comprises 77% titanium carbide, 20% tungsten carbide, and 3% yttrium oxide by mass percentage.

[0011] Preferably, the raw materials of the phosphate composite layer material include, by mass percentage, 8% phosphate binder, 11% alumina, 15% silicon carbide, 15% cerium-doped nano-SiO2-BNNSs hybrid material, 7% graphene-supported molybdenum disulfide nanoparticles, and 44% water.

[0012] Preferably, the phosphate binder is aluminum dihydrogen phosphate.

[0013] Preferably, the cerium-doped nano-SiO2-BNNSs hybrid material is prepared from the following raw materials in parts by weight: 5-10 parts hydroxylated boron nitride nanosheets, 0.1-0.5 parts cerium nitrate hexahydrate, 18.6-37.2 parts tetraethyl orthosilicate, 0.35-0.7 parts 3-aminopropyltriethoxysilane, 2000-3000 parts aqueous ethanol solution, 200-300 parts anhydrous ethanol, and 20-40 parts ethanol / acetic acid mixture.

[0014] Preferably, the preparation method of the cerium-doped nano-SiO2-BNNSs hybrid material includes the following steps:

[0015] Hydroxylated boron nitride nanosheets were dissolved in an ethanol solution and ultrasonically dispersed for 1-1.5 h to obtain a hydroxylated boron nitride nanosheet dispersion. The pH of the hydroxylated boron nitride nanosheet dispersion was adjusted to 8-9. Cerium nitrate hexahydrate was then added and ultrasonically dispersed for 30-60 min to obtain a composite solution. Tetraethyl orthosilicate was dissolved in anhydrous ethanol to obtain a tetraethyl orthosilicate solution. The tetraethyl orthosilicate solution was added dropwise to the composite solution and ultrasonically dispersed for 1-2 h, followed by stirring at room temperature for 18-24 h. 3-Aminopropyltriethoxysilane was dissolved in an ethanol / acetic acid mixture to obtain 3-aminopropyltriethoxysilane, and the 3-aminopropyltriethoxysilane solution was added to the reaction system and stirred at room temperature for 6-10 h. After centrifugation, the precipitate was obtained, washed several times with anhydrous ethanol, and then vacuum dried at 60-70 °C for 24-30 h to obtain cerium-doped nano-SiO2-BNNSs hybrid material.

[0016] Preferably, the method for preparing the hydroxylated boron nitride nanosheets includes the following steps:

[0017] Sulfuric acid and nitric acid are mixed at a mass ratio of 3-4:1 to obtain a mixed acid solution. Boron nitride nanosheets are added to the mixed acid solution and ultrasonically treated for 20-40 min, followed by stirring at 120-150℃ for 5-7 h. The precipitate is obtained by centrifugation and washed several times with anhydrous ethanol and water. The precipitate is then vacuum dried at 80-90℃ for 12-16 h and ground to obtain hydroxylated boron nitride nanosheets.

[0018] Preferably, the graphene-supported molybdenum disulfide nanoparticles are prepared from the following raw materials in parts by weight: 0.29-0.57 parts graphene oxide, 100-200 parts water, 3.5-7.1 parts ammonium molybdate tetrahydrate, 6.1-12.1 parts thiourea, and 0.038-0.076 parts cetyltrimethylammonium bromide.

[0019] Preferably, the method for preparing the graphene-supported molybdenum disulfide nanoparticles includes the following steps:

[0020] Graphene oxide was added to water and the mixture was sonicated for 2-3 hours to obtain a graphene oxide dispersion. Ammonium molybdate tetrahydrate, thiourea, and hexadecyltrimethylammonium bromide were added to the graphene oxide dispersion in sequence and sonicated for 1-2 hours to obtain a mixed solution. The pH of the mixed solution was adjusted to 2-3 and heated at 180-220℃ for 18-24 hours. After heating, the solution was centrifuged and washed several times with anhydrous ethanol and water to obtain a precursor solution. The prepared graphene / molybdenum disulfide precursor solution was pre-frozen in a refrigerator below -20℃ and then transferred to a freeze dryer for vacuum freeze-drying for 12-16 hours to obtain graphene-supported molybdenum disulfide nanoparticles.

[0021] Preferably, the thickness of the bottom layer is 1.2-1.8 mm; and the thickness of the phosphate composite layer is 80-150 μm.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. This application provides a composite nano-coating for the surface of a diamond saw blade. The composite nano-coating consists of two parts: a base layer and a phosphate composite coating. The base layer material is composed of titanium carbide, tungsten carbide, and yttrium oxide, and is coated onto the surface of the diamond saw blade using a laser cladding process. This ensures a strong bond between the coating and the substrate, thereby significantly improving the wear resistance and impact resistance of the saw blade. The precise control of the laser cladding process allows the base layer to uniformly cover the saw blade surface, providing a solid foundation for subsequent coatings. The phosphate composite coating material contains high-performance fillers such as silicon carbide, cerium-doped nano-SiO2-BNNSs hybrid material, and graphene-supported molybdenum disulfide nanoparticles, further enhancing the adhesion and corrosion resistance of the coating, while also improving its high-temperature resistance. This composite coating structure design allows the diamond saw blade to maintain excellent performance under extreme conditions such as high temperature and high friction, thereby extending the saw blade's service life and improving cutting efficiency. Detailed Implementation

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

[0025] The chemical reagents used in the preparation examples, embodiments, and comparative examples provided in this invention are all commercially available products.

[0026] Preparation Example 1: Preparation of Cerium-Doped Nano-SiO2-BNNSs Hybrid Material

[0027] Preparation Example 1.1

[0028] S1. Concentrated sulfuric acid and concentrated nitric acid were mixed at a mass ratio of 3:1 to obtain a mixed acid solution; boron nitride nanosheets were immersed in the mixed acid solution, sonicated for 20 min, and then stirred at 120 °C for 5 h; the precipitate was obtained by centrifugation, and the precipitate was washed three times with anhydrous ethanol and deionized water, vacuum dried at 80 °C for 12 h, and ground in an agate mortar to obtain hydroxylated boron nitride nanosheets;

[0029] S2. Dissolve 5g of hydroxylated boron nitride nanosheets in 2000g of ethanol solution (ethanol to water mass ratio of 3:1), and ultrasonically disperse for 1h to obtain a dispersion of hydroxylated boron nitride nanosheets; adjust the pH of the dispersion of hydroxylated boron nitride nanosheets to 8 with ammonia; then add 0.1g of cerium nitrate hexahydrate, ultrasonically disperse for 30min to obtain a composite solution; dissolve 18.6g of tetraethyl orthosilicate in 200g of anhydrous ethanol to obtain a tetraethyl orthosilicate solution; add the tetraethyl orthosilicate solution dropwise to the composite solution, ultrasonically disperse for 1h, and then magnetically stir for 18h at room temperature; add 0.35g... 3-Aminopropyltriethoxysilane was dissolved in 20g of an ethanol / acetic acid mixture (ethanol to acetic acid mass ratio of 0.75:1) to obtain 3-aminopropyltriethoxysilane. The 3-aminopropyltriethoxysilane solution was added to the reaction system and magnetically stirred at room temperature for 6h. After centrifugation, the precipitate was obtained. The precipitate was washed three times with anhydrous ethanol and then vacuum dried at 60℃ for 24h to obtain cerium-doped nano-SiO2-BNNSs hybrid material.

[0030] Preparation Example 1.2

[0031] S1. Concentrated sulfuric acid and concentrated nitric acid were mixed at a mass ratio of 3.5:1 to obtain a mixed acid solution. Boron nitride nanosheets were immersed in the mixed acid solution, sonicated for 30 min, and then stirred at 135 °C for 6 h. The precipitate was obtained by centrifugation and washed four times with anhydrous ethanol and deionized water. The precipitate was vacuum dried at 85 °C for 14 h and then ground in an agate mortar to obtain hydroxylated boron nitride nanosheets.

[0032] S2. 7.5 g of hydroxylated boron nitride nanosheets were dissolved in 2500 g of ethanol solution (ethanol to water mass ratio of 3:1) and ultrasonically dispersed for 1.25 h to obtain a dispersion of hydroxylated boron nitride nanosheets. The pH of the dispersion was adjusted to 8.5 with ammonia. Then, 0.3 g of cerium nitrate hexahydrate was added and ultrasonically dispersed for 45 min to obtain a composite solution. 27.9 g of tetraethyl orthosilicate was dissolved in 250 g of anhydrous ethanol to obtain a tetraethyl orthosilicate solution. The tetraethyl orthosilicate solution was added dropwise to the composite solution and ultrasonically dispersed for 1.5 h, then magnetically stirred at room temperature for 21 h. 0.5 g of... 3-Aminopropyltriethoxysilane was dissolved in 30g of an ethanol / acetic acid mixture (ethanol to acetic acid mass ratio of 0.75:1) to obtain 3-aminopropyltriethoxysilane. The 3-aminopropyltriethoxysilane solution was added to the reaction system and magnetically stirred at room temperature for 8h. After centrifugation, the precipitate was obtained. The precipitate was washed four times with anhydrous ethanol and then vacuum dried at 65℃ for 27h to obtain cerium-doped nano-SiO2-BNNSs hybrid material.

[0033] Preparation Example 1.3

[0034] S1. Concentrated sulfuric acid and concentrated nitric acid were mixed at a mass ratio of 4:1 to obtain a mixed acid solution; boron nitride nanosheets were immersed in the mixed acid solution, sonicated for 40 min, and then stirred at 150 °C for 7 h; the precipitate was obtained by centrifugation, and the precipitate was washed 5 times with anhydrous ethanol and deionized water, vacuum dried at 90 °C for 16 h, and ground in an agate mortar to obtain hydroxylated boron nitride nanosheets;

[0035] S2. Dissolve 10g of hydroxylated boron nitride nanosheets in 3000g of ethanol solution (ethanol to water mass ratio of 3:1) and ultrasonically disperse for 1.5h to obtain a dispersion of hydroxylated boron nitride nanosheets; adjust the pH of the dispersion of hydroxylated boron nitride nanosheets to 9 with ammonia; then add 0.5g of cerium nitrate hexahydrate and ultrasonically disperse for 60min to obtain a composite solution; dissolve 37.2g of tetraethyl orthosilicate in 300g of anhydrous ethanol to obtain a tetraethyl orthosilicate solution; add the tetraethyl orthosilicate solution dropwise to the composite solution, ultrasonically disperse for 2h, and then magnetically stir for 24h at room temperature; add 0.7g... 3-Aminopropyltriethoxysilane was dissolved in 40g of an ethanol / acetic acid mixture (ethanol to acetic acid mass ratio of 0.75:1) to obtain 3-aminopropyltriethoxysilane. The 3-aminopropyltriethoxysilane solution was added to the reaction system and magnetically stirred at room temperature for 10h. After centrifugation, the precipitate was obtained. The precipitate was washed 5 times with anhydrous ethanol and then vacuum dried at 70℃ for 30h to obtain cerium-doped nano-SiO2-BNNSs hybrid material.

[0036] Preparation Example 2: Preparation of Graphene-Supported Molybdenum Disulfide Nanoparticles

[0037] Preparation Example 2.1

[0038] 0.29 g of graphene oxide was added to 100 g of deionized water, and the mixture was sonicated for 2 h to obtain a graphene oxide dispersion. 3.5 g of ammonium molybdate tetrahydrate, 6.1 g of thiourea, and 0.038 g of hexadecyltrimethylammonium bromide were added sequentially to the graphene oxide dispersion, and the mixture was sonicated for 1 h to obtain a mixed solution. The pH of the mixed solution was adjusted to 3 with 37% hydrochloric acid solution, and the solution was heated in an oven at 180 °C for 18 h. After heating, the solution was centrifuged and washed three times with anhydrous ethanol and ultrapure water to obtain a precursor solution. The prepared graphene / molybdenum disulfide precursor solution was pre-frozen at -25 °C for 10 h, and then transferred to a freeze dryer for vacuum freeze-drying for 12 h to obtain graphene-supported molybdenum disulfide nanoparticles.

[0039] Preparation Example 2.2

[0040] 0.43 g of graphene oxide was added to 150 g of deionized water, and the mixture was sonicated for 2.5 h to obtain a graphene oxide dispersion. 5.3 g of ammonium molybdate tetrahydrate, 9.2 g of thiourea, and 0.057 g of hexadecyltrimethylammonium bromide were added to the graphene oxide dispersion sequentially, and the mixture was sonicated for 1.5 h to obtain a mixed solution. The pH of the mixed solution was adjusted to 2.5 with 37% hydrochloric acid solution, and the mixed solution was heated in an oven at 200 °C for 21 h. After heating, the solution was centrifuged and washed four times with anhydrous ethanol and ultrapure water to obtain a precursor solution. The prepared graphene / molybdenum disulfide precursor solution was pre-frozen in a freezer at -30 °C for 12 h, and then transferred to a freeze dryer for vacuum freeze-drying for 14 h to obtain graphene-supported molybdenum disulfide nanoparticles.

[0041] Preparation Example 2.3

[0042] 0.57 g of graphene oxide was added to 200 g of deionized water, and the mixture was sonicated for 3 h to obtain a graphene oxide dispersion. 7.1 g of ammonium molybdate tetrahydrate, 12.1 g of thiourea, and 0.076 g of hexadecyltrimethylammonium bromide were added sequentially to the graphene oxide dispersion, and the mixture was sonicated for 2 h to obtain a mixed solution. The pH of the mixed solution was adjusted to 2 with 37% hydrochloric acid solution, and the solution was heated in an oven at 220 °C for 24 h. After heating, the solution was centrifuged and washed five times with anhydrous ethanol and ultrapure water to obtain a precursor solution. The prepared graphene / molybdenum disulfide precursor solution was pre-frozen at -35 °C for 14 h, and then transferred to a freeze dryer for vacuum freeze-drying for 16 h to obtain graphene-supported molybdenum disulfide nanoparticles.

[0043] Example 1

[0044] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0045] The underlying material comprises, by mass percentage, 71% titanium carbide, 25% tungsten carbide, and 4% yttrium oxide;

[0046] The raw materials of the phosphate composite layer material include, by mass percentage, 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 5% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 52% water.

[0047] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 1.2 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 80 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0048] Example 2

[0049] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0050] The underlying material comprises, by mass percentage, 77% titanium carbide, 20% tungsten carbide, and 3% yttrium oxide;

[0051] The raw materials of the phosphate composite layer material include, by mass percentage, 8% aluminum dihydrogen phosphate, 11% alumina, 15% silicon carbide, 15% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 7% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 44% water.

[0052] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 1.2 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 80 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0053] Example 3

[0054] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0055] The underlying material comprises, by mass percentage, 83% titanium carbide, 15% tungsten carbide, and 2% yttrium oxide;

[0056] The raw materials of the phosphate composite layer material include, by mass percentage, 10% aluminum dihydrogen phosphate, 14% alumina, 20% silicon carbide, 10% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 10% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 36% water.

[0057] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 1.2 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 80 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0058] Example 4

[0059] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0060] The underlying material comprises, by mass percentage, 71% titanium carbide, 25% tungsten carbide, and 4% yttrium oxide;

[0061] The raw materials of the phosphate composite layer material include, by mass percentage, 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 5% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 52% water.

[0062] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 1.5 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 115 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0063] Example 5

[0064] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0065] The underlying material comprises, by mass percentage, 71% titanium carbide, 25% tungsten carbide, and 4% yttrium oxide;

[0066] The raw materials of the phosphate composite layer material include, by mass percentage, 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 5% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 52% water.

[0067] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 1.8 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 150 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0068] Example 6

[0069] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0070] The underlying material comprises, by mass percentage, 71% titanium carbide, 25% tungsten carbide, and 4% yttrium oxide;

[0071] The raw materials of the phosphate composite layer material include, by mass percentage, 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 5% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 52% water.

[0072] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 0.6 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 50 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0073] Example 7

[0074] A composite nano-coating for the surface of a diamond saw blade, the composite nano-coating comprising an underlayer and a phosphate composite layer;

[0075] The underlying material comprises, by mass percentage, 71% titanium carbide, 25% tungsten carbide, and 4% yttrium oxide;

[0076] The raw materials of the phosphate composite layer material include, by mass percentage, 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared in Preparation Example 1.1, 5% graphene-supported molybdenum disulfide nanoparticles prepared in Preparation Example 2.1, and 52% water.

[0077] The base material is coated onto the surface of the diamond saw blade using a laser cladding process to form a base layer with a thickness of 2.4 mm; then a phosphate reinforcing layer material is sprayed onto the base layer with a thickness of 200 μm; thus, a composite nano-coating is obtained on the surface of the diamond saw blade.

[0078] Example 8

[0079] The difference between Example 8 and Example 1 is that the cerium-doped nano-SiO2-BNNSs hybrid material used in Example 8 was prepared by Example 1.2.

[0080] Example 9

[0081] The difference between Example 9 and Example 1 is that the cerium-doped nano-SiO2-BNNSs hybrid material used in Example 9 was prepared by Example 1.3.

[0082] Example 10

[0083] The difference between Example 10 and Example 1 is that the graphene-supported molybdenum disulfide nanoparticles used in Example 10 were prepared by Preparation Example 2.2.

[0084] Example 11

[0085] The difference between Example 11 and Example 1 is that the graphene-supported molybdenum disulfide nanoparticles used in Example 11 were prepared by Preparation Example 2.3.

[0086] Comparative Example 1

[0087] The difference between Comparative Example 1 and Example 1 is that yttrium oxide is not added to the bottom material of Comparative Example 1, and the raw material includes 75% titanium carbide and 25% tungsten carbide by mass percentage.

[0088] Comparative Example 2

[0089] The difference between Comparative Example 2 and Example 1 is that no cerium-doped nano-SiO2-BNNSs hybrid material is added to the phosphate composite layer material in Comparative Example 2. The raw materials include 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 5% graphene-supported molybdenum disulfide nanoparticles prepared by Preparation Example 2.1, and 72% water by mass percentage.

[0090] Comparative Example 3

[0091] The difference between Comparative Example 3 and Example 1 is that no graphene-supported molybdenum disulfide nanoparticles are added to the phosphate composite layer material in Comparative Example 3. The raw materials include 5% aluminum dihydrogen phosphate, 8% alumina, 10% silicon carbide, 20% cerium-doped nano-SiO2-BNNSs hybrid material prepared by Preparation Example 1.1, and 57% water by mass percentage.

[0092] Comparative Example 4

[0093] The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 does not have a base layer coated, but only a phosphate composite layer with a thickness of 80 μm.

[0094] Performance testing

[0095] I. Friction and Wear Test: The high temperature friction and wear tester (HT-1000) of Lanzhou Zhongke Kaihua Technology Development Co., Ltd. was used. The test conditions were: load of 147g and test time of 5min. The wear rate of the coatings of Examples 1-11 and Comparative Examples 1-4 was tested at room temperature and 500℃. The results are shown in Table 1.

[0096] II. Friction coefficient test: The friction coefficients of the coatings of Examples 1-11 and Comparative Examples 1-4 were tested according to ISO-2409 standard, and the results are shown in Table 1.

[0097] III. Adhesion Grade: The adhesion grades of the coatings of Examples 1-11 and Comparative Examples 1-4 were tested in accordance with ISO-2409 standard, and the results are shown in Table 1.

[0098] The specific test results are as follows:

[0099] Table 1 Performance Test Results

[0100]

[0101]

[0102] As can be seen from the test results in Table 1, the composite nano-coating on the surface of the diamond saw blade provided in this application has a low wear rate at room temperature and 500℃, indicating that the coating provided in this application has strong wear resistance and high temperature resistance, and the coating has a low coefficient of friction and strong adhesion.

[0103] 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 composite nano-coating on the surface of a diamond saw blade, characterized in that: The composite nanocoating comprises an underlayer and a phosphate composite layer; The underlying material comprises, by mass percentage, 71-83% titanium carbide, 15-25% tungsten carbide, and 2-4% yttrium oxide; The raw materials of the phosphate composite layer material include, by mass percentage, 5-10% phosphate binder, 8-14% alumina, 10-20% silicon carbide, 10-20% cerium-doped nano-SiO2-BNNSs hybrid material, 5-10% graphene-supported molybdenum disulfide nanoparticles, and the balance being water. The bottom layer material is coated onto the surface of the diamond saw blade using a laser cladding process to form the bottom layer. Then, a phosphate composite layer material is coated onto the bottom layer to obtain a composite nano-coating on the surface of the diamond saw blade.

2. The composite nano-coating on the surface of a diamond saw blade according to claim 1, characterized in that: The underlying material comprises, by mass percentage, 77% titanium carbide, 20% tungsten carbide, and 3% yttrium oxide.

3. The composite nano-coating on the surface of a diamond saw blade according to claim 1, characterized in that: The raw materials of the phosphate composite layer material include, by mass percentage, 8% phosphate binder, 11% alumina, 15% silicon carbide, 15% cerium-doped nano-SiO2-BNNSs hybrid material, 7% graphene-supported molybdenum disulfide nanoparticles, and 44% water.

4. A composite nano-coating on the surface of a diamond saw blade according to claim 1 or 3, characterized in that: The phosphate binder is aluminum dihydrogen phosphate.

5. A composite nano-coating on the surface of a diamond saw blade according to claim 1 or 3, characterized in that: The cerium-doped nano-SiO2-BNNSs hybrid material is prepared from the following raw materials in parts by weight: 5-10 parts hydroxylated boron nitride nanosheets, 0.1-0.5 parts cerium nitrate hexahydrate, 18.6-37.2 parts tetraethyl orthosilicate, 0.35-0.7 parts 3-aminopropyltriethoxysilane, 2000-3000 parts aqueous ethanol solution, 200-300 parts anhydrous ethanol, and 20-40 parts ethanol / acetic acid mixture.

6. The composite nano-coating on the surface of a diamond saw blade according to claim 5, characterized in that: The preparation method of the cerium-doped nano-SiO2-BNNSs hybrid material includes the following steps: Hydroxylated boron nitride nanosheets were dissolved in an ethanol solution and ultrasonically dispersed for 1-1.5 h to obtain a hydroxylated boron nitride nanosheet dispersion. The pH of the hydroxylated boron nitride nanosheet dispersion was adjusted to 8-9. Cerium nitrate hexahydrate was then added and ultrasonically dispersed for 30-60 min to obtain a composite solution. Tetraethyl orthosilicate was dissolved in anhydrous ethanol to obtain a tetraethyl orthosilicate solution. The tetraethyl orthosilicate solution was added dropwise to the composite solution and ultrasonically dispersed for 1-2 h, followed by stirring at room temperature for 18-24 h. 3-Aminopropyltriethoxysilane was dissolved in an ethanol / acetic acid mixture to obtain 3-aminopropyltriethoxysilane, and the 3-aminopropyltriethoxysilane solution was added to the reaction system and stirred at room temperature for 6-10 h. The precipitate was obtained by centrifugation, washed several times with anhydrous ethanol, and then vacuum dried at 60-70 °C for 24-30 h to obtain cerium-doped nano-SiO2-BNNSs hybrid material.

7. The composite nano-coating on the surface of a diamond saw blade according to claim 5, characterized in that: The method for preparing the hydroxylated boron nitride nanosheets includes the following steps: Sulfuric acid and nitric acid are mixed at a mass ratio of 3-4:1 to obtain a mixed acid solution. Boron nitride nanosheets are added to the mixed acid solution and ultrasonically treated for 20-40 min, followed by stirring at 120-150℃ for 5-7 h. The precipitate is obtained by centrifugation and washed several times with anhydrous ethanol and water. The precipitate is then vacuum dried at 80-90℃ for 12-16 h and ground to obtain hydroxylated boron nitride nanosheets.

8. A composite nano-coating on the surface of a diamond saw blade according to claim 1 or 3, characterized in that: The graphene-supported molybdenum disulfide nanoparticles are prepared from the following raw materials in parts by weight: 0.29-0.57 parts graphene oxide, 100-200 parts water, 3.5-7.1 parts ammonium molybdate tetrahydrate, 6.1-12.1 parts thiourea, and 0.038-0.076 parts cetyltrimethylammonium bromide.

9. The composite nano-coating on the surface of a diamond saw blade according to claim 8, characterized in that: The preparation method of the graphene-supported molybdenum disulfide nanoparticles includes the following steps: Graphene oxide was added to water and the mixture was sonicated for 2-3 hours to obtain a graphene oxide dispersion. Ammonium molybdate tetrahydrate, thiourea, and hexadecyltrimethylammonium bromide were added to the graphene oxide dispersion in sequence and sonicated for 1-2 hours to obtain a mixed solution. The pH of the mixed solution was adjusted to 2-3 and heated at 180-220℃ for 18-24 hours. After heating, the solution was centrifuged and washed several times with anhydrous ethanol and water to obtain a precursor solution. The prepared graphene / molybdenum disulfide precursor solution was pre-frozen in a refrigerator below -20℃ and then transferred to a freeze dryer for vacuum freeze-drying for 12-16 hours to obtain graphene-supported molybdenum disulfide nanoparticles.

10. The composite nano-coating on the surface of a diamond saw blade according to claim 1, characterized in that: The thickness of the bottom layer is 1.2-1.8 mm; the thickness of the phosphate composite layer is 80-150 μm.

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