High-temperature transmission mesh belt antirust layer and preparation method thereof

Abstract

The invention discloses a high-temperature transmission mesh belt antirust layer and a preparation method thereof, and relates to the technical field of metal plating. The method comprises the following steps: firstly, cleaning and hydroxylating the surface of a metal mesh belt, then spraying an ethanol solution of a silane coupling agent, drying, then uniformly spraying a sodium tripolyphosphate solution onto the surface of the metal mesh belt through an atomizing nozzle, and then baking the metal mesh belt at the temperature of 400-640 DEG C, and finally, the Ti-C-Si-B composite powder is sprayed to the surface of the metal mesh belt through plasma spraying, and the high-temperature transmission mesh belt anti-rust layer is obtained after heat preservation. The high-temperature transmission mesh belt anti-rust layer prepared by the invention has excellent high-temperature resistance and excellent adhesive force and also has excellent anti-corrosion and anti-rust performance.

Description

Technical Field

[0001] The present application relates to the technical field of metal plating, and in particular to a high-temperature transmission mesh belt anti-rust layer and a preparation method thereof. Background Art

[0002] In modern industrial production, high-temperature conveyor belts are widely used in food processing, metallurgy, chemical engineering, ceramics, and other fields, fulfilling the critical task of material transportation. Under harsh operating conditions such as high temperatures and complex chemical environments, the service life and performance of the belts directly impact production efficiency and product quality, and rust resistance is a crucial factor in ensuring their stable operation.

[0003] Traditional high-temperature transmission mesh belt rust-proofing coatings, such as single metal plating and organic coatings, are prone to peeling and oxidation failure in high-temperature environments, making their rust-proofing effects difficult to maintain. While some composite coatings have shown some improvement, due to insufficient interlayer adhesion, they still delaminate after long-term use, resulting in a decrease in rust-proofing performance. With industrial production's increasing demands for equipment reliability and durability, the development of high-temperature transmission mesh belt rust-proofing coatings and their preparation methods with excellent high-temperature resistance, strong adhesion, and long-term rust-proofing properties has become an urgent need to address existing technical challenges and promote the upgrading of related industries.

[0004] Chinese patent application CN116875932A discloses a powder for plasma spraying, a method for preparing a surface coating, and applications thereof. The plasma spraying powder comprises, based on the total weight of the powder, 40-60 wt% silicon powder, 10-20 wt% silicon carbide powder, 20-40 wt% carbon powder, and 0.2-1.5 wt% polyvinyl alcohol. The powder is used as a spray coating material for plasma spraying on a graphite or metal substrate, resulting in a composite surface coating containing nitrogen-doped silicon carbide and carbon.

[0005] However, the above surface coating is only a single-layer composite coating, and the coating adhesion, high temperature resistance, and anti-corrosion and anti-rust properties can still be improved. Summary of the Invention

[0006] To address the shortcomings of the prior art, the present application provides a high-temperature transmission mesh belt rust-proof coating and a preparation method thereof. The high-temperature transmission mesh belt rust-proof coating is obtained by cleaning and hydroxylating the surface of the metal mesh belt, spraying an ethanol solution of a silane coupling agent on it, drying it, and evenly spraying a sodium tripolyphosphate solution onto the surface of the metal mesh belt through an atomizing nozzle. The metal mesh belt is then baked at a temperature of 400 to 640°C, and finally a Ti-C-Si-B composite powder is sprayed onto the surface of the metal mesh belt by plasma spraying. After heat preservation, the high-temperature transmission mesh belt rust-proof coating is obtained.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a high-temperature transmission mesh belt rust-proof layer, wherein the high-temperature transmission mesh belt rust-proof layer includes, from the inside to the outside, an organosilicon coupling layer, a phosphate layer, and a Ti-C-Si-B composite layer; the organosilicon coupling layer includes a phosphorus-containing organosilicon compound; the phosphorus-containing organosilicon compound includes one or two of tris(trimethylsilyl)phosphite and tris(trimethylsilyl)phosphate; the Ti-C-Si-B composite layer is formed by plasma spraying; the Ti-C-Si-B composite layer includes titanium dioxide, carbon powder, silicon powder, and borate.

[0009] In a second aspect, the present application provides a method for preparing an anti-rust layer of a high-temperature transmission mesh belt, comprising the following steps:

[0010] The surface of the metal mesh belt is cleaned and degreased, then sandblasted, and then immersed in a 5M NaOH solution at 60-80°C for 30-60 minutes;

[0011] Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100-110°C for 20-30 minutes;

[0012] Spraying an ethanol solution of a phosphorus-containing organosilicon compound onto the surface of a dry metal mesh belt and keeping the temperature at 50-60° C. for 30-60 minutes, and then keeping the temperature at 100-120° C. for 1-2 hours to obtain an organosilicon coupling layer on the surface of the metal mesh belt;

[0013] Spraying a phosphate solution onto the surface of the metal mesh belt and baking it at a temperature of 400 to 640° C. for 10 to 20 minutes to obtain a phosphate layer on the surface of the organosilicon coupling layer;

[0014] Weigh titanium dioxide, carbon powder, silicon powder, and borate according to the mass ratio, and ball-mill and mix for 3 to 5 hours to obtain a Ti-C-Si-B mixed powder;

[0015] The plasma spraying power, plasma gas flow rate, and the distance between the substrate and the nozzle are controlled to spray the composite powder onto the surface of the phosphate layer to obtain a Ti-C-Si-B composite layer, that is, the high-temperature transmission mesh belt rust-proof layer.

[0016] Beneficial technical effects:

[0017] In the high-temperature transmission mesh belt anti-rust layer prepared in the present application, the organosilicon coupling layer contains a phosphorus-containing organosilicon compound. Therefore, while the organosilicon coupling layer is chemically bonded to the surface of the metal mesh belt, the phosphorus-containing groups therein will further combine with the phosphate groups in the phosphate layer, greatly improving the adhesion of the coating; the phosphate groups in the phosphate layer will chelate with the metal on the surface of the metal mesh belt, and then form a dense passivation film layer after heating, further improving the adhesion and anti-corrosion and anti-rust properties; finally, when the composite powder is plasma sprayed, the silicon powder and carbon powder therein will in situ produce silicon carbide under the high-temperature environment of plasma spraying, and sprayed onto the phosphate layer, thereby enhancing the high-temperature resistance and rust resistance of the high-temperature transmission mesh belt anti-rust layer; at the same time, titanium dioxide will also react with the phosphorus-containing substances in the phosphate layer under the high-temperature environment of plasma spraying to produce titanium phosphate, further enhancing the adhesion of the anti-rust layer, and further improving the high-temperature resistance and rust resistance of the high-temperature transmission mesh belt anti-rust layer. Finally, borates will melt under the high temperature environment of plasma spraying, which not only plays a fluxing role, but also can fill the pores of the coating during the spraying process and enhance the adhesion of the anti-rust layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the anti-rust layer of the prepared high-temperature transmission mesh belt.

[0019] Figure 2 It is a schematic diagram of the preparation process of the anti-rust layer of the high-temperature transmission mesh belt.

[0020] The meanings of the reference numerals in the figure are: 1. organic silicon coupling layer; 2. phosphate layer; 3. Ti-C-Si-B composite layer. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions, and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below with reference to the following examples. However, this should not be construed as limiting the scope of this application to the following examples. Without departing from the above-mentioned method concepts of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0022] In this application, the terms used in this application are for the purpose of describing specific embodiments only and are not intended to be limiting of the application.

[0023] As used in this application, the singular forms "for," "or," "an," "any," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0024] In addition, the terms “first” and “second”, if used, are only used for descriptive purposes and should not be understood as indicating or implying relative importance.

[0025] In the first aspect, the present application provides a high-temperature transmission mesh belt anti-rust layer, the structure of which is as follows: Figure 1 As shown, the high-temperature transmission mesh belt anti-rust layer includes, from the inside to the outside, an organosilicon coupling layer 1, a phosphate layer 2, and a Ti-C-Si-B composite layer 3; the organosilicon coupling layer 1 includes a phosphorus-containing organosilicon compound; the phosphorus-containing organosilicon compound includes one or both of tris(trimethylsilyl)phosphite and tris(trimethylsilyl)phosphate; the Ti-C-Si-B composite layer 3 is formed by plasma spraying; the Ti-C-Si-B composite layer 3 includes titanium dioxide, carbon powder, silicon powder, and borate.

[0026] In one possible implementation, the borate includes one or both of potassium borate and sodium tetraborate; in the Ti-C-Si-B composite layer 3, the mass ratio of titanium dioxide, carbon powder, silicon powder and borate is (40-60): (10-15): (25-40): (5-10).

[0027] In the second aspect, the present application provides a method for preparing an anti-rust layer of a high-temperature transmission mesh belt, such as Figure 2 As shown, the following steps are included:

[0028] The surface of the metal mesh belt is cleaned and degreased, then sandblasted, and then immersed in a 5M NaOH solution at 60-80°C for 30-60 minutes;

[0029] Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100-110°C for 20-30 minutes;

[0030] Spraying an ethanol solution of a phosphorus-containing organosilicon compound onto the surface of a dry metal mesh belt and keeping the temperature at 50-60° C. for 30-60 minutes, and then keeping the temperature at 100-120° C. for 1-2 hours to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0031] Spraying a phosphate solution onto the surface of the metal mesh belt and baking it at a temperature of 400 to 640° C. for 10 to 20 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0032] Weigh titanium dioxide, carbon powder, silicon powder, and borate according to the mass ratio, and ball-mill and mix for 3 to 5 hours to obtain a Ti-C-Si-B mixed powder;

[0033] The plasma spraying power, plasma gas flow rate, and the distance between the substrate and the nozzle are controlled to spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt rust-proof layer.

[0034] In a possible implementation, in the ethanol solution of the phosphorus-containing organosilicon compound, the mass ratio of the phosphorus-containing organosilicon compound to ethanol is 1:(5-8).

[0035] In a possible implementation, the phosphate solution is prepared by slowly adding 0.8 to 8.0 kg of phosphate to 100 kg of deionized water and stirring for 10 to 30 minutes to obtain the phosphate solution.

[0036] In a possible implementation, the phosphate used in the phosphate solution includes one or more of sodium tripolyphosphate, sodium pyrophosphate, sodium tetrapolyphosphate, and sodium hexametaphosphate.

[0037] In a possible implementation, the average particle size of the Ti—C—Si—B mixed powder is 50 to 100 μm.

[0038] In a possible implementation, the plasma spraying power is 20-30 kW.

[0039] In a possible implementation, the plasma gas flow rate is 50 to 80 L / min.

[0040] In a possible implementation, the distance between the substrate and the nozzle is 100-150 mm.

[0041] The following will describe in detail a method for preparing an anti-rust layer of a high-temperature transmission mesh belt provided by the present application in combination with different embodiments.

[0042] Example 1:

[0043] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0044] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution at 60°C for 60 minutes;

[0045] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100°C for 30 minutes;

[0046] 3. Spraying an ethanol solution of tris(trimethylsilyl)phosphite onto the surface of a dry metal mesh belt and keeping the temperature at 50° C. for 60 minutes, and then keeping the temperature at 100° C. for 2 hours, to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0047] The mass ratio of tris(trimethylsilyl)phosphite to ethanol is 1:5;

[0048] 4. Slowly add 0.8 kg of sodium tripolyphosphate to 100 kg of deionized water and stir for 10 minutes to obtain the phosphate solution;

[0049] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 400° C. for 20 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0050] 6. Weigh titanium dioxide, carbon powder, silicon powder, and potassium borate according to the mass ratio, and mix them by ball milling for 3 hours to obtain Ti-C-Si-B mixed powder;

[0051] The mass ratio of titanium dioxide, carbon powder, silicon powder and potassium borate is 55:10:25:10;

[0052] 7. Control the plasma spraying power to 20 kW, the plasma gas flow rate to 50 L / min, and the distance between the substrate and the nozzle to 100 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0053] Example 2:

[0054] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0055] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution at 70°C for 45 minutes;

[0056] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 110°C for 20 minutes;

[0057] 3. Spraying an ethanol solution of tris(trimethylsilyl) phosphate onto the surface of the dried metal mesh belt and keeping the temperature at 60° C. for 30 minutes, and then keeping the temperature at 120° C. for 1 hour, to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0058] The mass ratio of tris(trimethylsilyl)phosphate to ethanol is 1:8;

[0059] 4. Slowly add 8.0 kg of sodium pyrophosphate to 100 kg of deionized water and stir for 30 minutes to obtain the phosphate solution;

[0060] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 550° C. for 12 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0061] 6. Weigh titanium dioxide, carbon powder, silicon powder, and sodium tetraborate according to the mass ratio, and ball mill them for 3 hours to obtain a Ti-C-Si-B mixed powder;

[0062] The mass ratio of titanium dioxide, carbon powder, silicon powder and sodium tetraborate is 55:10:25:10;

[0063] 7. Control the plasma spraying power to 20 kW, the plasma gas flow rate to 50 L / min, and the distance between the substrate and the nozzle to 100 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0064] Example 3:

[0065] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0066] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution and keep it at 80℃ for 30 minutes;

[0067] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 105°C for 25 minutes;

[0068] 3. Spraying an ethanol solution of tris(trimethylsilyl)phosphite onto the surface of the dried metal mesh belt and keeping the temperature at 55° C. for 45 minutes, and then keeping the temperature at 110° C. for 1.5 hours to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0069] The mass ratio of tris(trimethylsilyl)phosphite to ethanol is 1:6;

[0070] 4. Slowly add 4.0 kg of sodium tetrapolyphosphate to 100 kg of deionized water and stir for 20 minutes to obtain the phosphate solution;

[0071] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 500° C. for 15 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0072] 6. Weigh titanium dioxide, carbon powder, silicon powder, and sodium tetraborate according to the mass ratio, and mix them by ball milling for 4 hours to obtain Ti-C-Si-B mixed powder;

[0073] The mass ratio of titanium dioxide, carbon powder, silicon powder and sodium tetraborate is 55:12:25:8;

[0074] 7. Control the plasma spraying power to 25 kW, the plasma gas flow rate to 65 L / min, and the distance between the substrate and the nozzle to 125 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0075] Example 4:

[0076] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0077] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution at 65°C for 50 minutes;

[0078] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 105°C for 20 minutes;

[0079] 3. Spraying an ethanol solution of tris(trimethylsilyl) phosphate onto the surface of the dried metal mesh belt and keeping the temperature at 50° C. for 35 minutes, and then keeping the temperature at 105° C. for 1.2 hours to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0080] The mass ratio of tris(trimethylsilyl)phosphate to ethanol is 1:7;

[0081] 4. Slowly add 2.0 kg of sodium hexametaphosphate to 100 kg of deionized water and stir for 15 minutes to obtain the phosphate solution;

[0082] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 450° C. for 18 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0083] 6. Weigh titanium dioxide, carbon powder, silicon powder, and potassium borate according to the mass ratio, and mix them by ball milling for 4 hours to obtain Ti-C-Si-B mixed powder;

[0084] The mass ratio of titanium dioxide, carbon powder, silicon powder and potassium borate is 45:13:32:10;

[0085] 7. Control the plasma spraying power to 22 kW, the plasma gas flow rate to 55 L / min, and the distance between the substrate and the nozzle to 110 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain the Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0086] Example 5:

[0087] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0088] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution and keep it at 60-80℃ for 30-60min;

[0089] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 108°C for 25 minutes;

[0090] 3. Spraying an ethanol solution of tris(trimethylsilyl)phosphite onto the surface of the dried metal mesh belt and keeping the temperature at 60° C. for 50 minutes, and then keeping the temperature at 115° C. for 1.5 hours to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0091] The mass ratio of tris(trimethylsilyl)phosphite to ethanol is 1:5.5;

[0092] 4. Slowly add 6.0 kg of sodium tripolyphosphate to 100 kg of deionized water and stir for 25 minutes to obtain the phosphate solution;

[0093] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 640° C. for 10 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0094] 6. Weigh titanium dioxide, carbon powder, silicon powder, and sodium tetraborate according to the mass ratio, and mix them by ball milling for 4.5 hours to obtain Ti-C-Si-B mixed powder;

[0095] The mass ratio of titanium dioxide, carbon powder, silicon powder and sodium tetraborate is 50:12:32:6;

[0096] 7. Control the plasma spraying power to 28 kW, the plasma gas flow rate to 75 L / min, and the distance between the substrate and the nozzle to 140 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0097] Example 6:

[0098] like Figure 2 As shown, a method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0099] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution and keep it at 60-80℃ for 30-60min;

[0100] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100°C for 30 minutes;

[0101] 3. Spraying an ethanol solution of tris(trimethylsilyl) phosphate onto the surface of the dried metal mesh belt and keeping the temperature at 50° C. for 55 minutes, and then keeping the temperature at 120° C. for 1 hour, to obtain an organosilicon coupling layer 1 on the surface of the metal mesh belt;

[0102] The mass ratio of tris(trimethylsilyl)phosphate to ethanol is 1:7.5;

[0103] 4. Slowly add 3.0 kg of sodium tripolyphosphate to 100 kg of deionized water and stir for 18 minutes to obtain the phosphate solution;

[0104] 5. Spraying the phosphate solution onto the surface of the metal mesh belt and baking it at 600° C. for 12 minutes to obtain a phosphate layer 2 on the surface of the organosilicon coupling layer 1;

[0105] 6. Weigh titanium dioxide, carbon powder, silicon powder, and potassium borate according to the mass ratio, and mix them by ball milling for 5 hours to obtain Ti-C-Si-B mixed powder;

[0106] The mass ratio of titanium dioxide, carbon powder, silicon powder and potassium borate is 40:15:35:10;

[0107] 7. Control the plasma spraying power to 24 kW, the plasma gas flow rate to 60 L / min, and the distance between the substrate and the nozzle to 130 mm, and spray the composite powder onto the surface of the phosphate layer 2 to obtain a Ti-C-Si-B composite layer 3, that is, the high-temperature transmission mesh belt anti-rust layer.

[0108] Comparative Example 1:

[0109] A method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0110] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution at 60°C for 60 minutes;

[0111] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100°C for 30 minutes;

[0112] 3. Slowly add 0.8 kg of sodium tripolyphosphate to 100 kg of deionized water and stir for 10 minutes to obtain the phosphate solution;

[0113] 4. Spray the phosphate solution onto the surface of the metal mesh belt and bake it at 400°C for 20 minutes to obtain a phosphate layer on the surface of the metal mesh belt;

[0114] 5. Weigh titanium dioxide, carbon powder, silicon powder, and potassium borate according to the mass ratio, and mix them by ball milling for 3 hours to obtain Ti-C-Si-B mixed powder;

[0115] The mass ratio of titanium dioxide, carbon powder, silicon powder and potassium borate is 55:10:25:10;

[0116] 6. Control the plasma spraying power to 20 kW, the plasma gas flow rate to 50 L / min, and the distance between the substrate and the nozzle to 100 mm, and spray the composite powder onto the surface of the phosphate layer to obtain a Ti-C-Si-B composite layer, that is, the high-temperature transmission mesh belt rust-proof layer.

[0117] Comparative Example 2:

[0118] A method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0119] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution and keep it at 80℃ for 30 minutes;

[0120] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 105°C for 25 minutes;

[0121] 3. Spraying an ethanol solution of tris(trimethylsilyl)phosphite onto the surface of the dried metal mesh belt and keeping it at 55°C for 45 minutes, and then keeping it at 110°C for 1.5 hours to obtain an organosilicon coupling layer on the surface of the metal mesh belt;

[0122] The mass ratio of tris(trimethylsilyl)phosphite to ethanol is 1:6;

[0123] 4. Weigh titanium dioxide, carbon powder, silicon powder, and sodium tetraborate according to the mass ratio, and mix them by ball milling for 4 hours to obtain Ti-C-Si-B mixed powder;

[0124] The mass ratio of titanium dioxide, carbon powder, silicon powder and sodium tetraborate is 55:12:25:8;

[0125] 5. Control the plasma spraying power to 25 kW, the plasma gas flow rate to 65 L / min, and the distance between the substrate and the nozzle to 125 mm, and spray the composite powder onto the surface of the organic silicon coupling layer to obtain a Ti-C-Si-B composite layer, that is, the high-temperature transmission mesh belt anti-rust layer.

[0126] Comparative Example 3:

[0127] A method for preparing an anti-rust layer of a high-temperature transmission mesh belt comprises the following steps:

[0128] 1. Clean and degrease the surface of the metal mesh belt, then sandblast it, and then immerse it in 5M NaOH solution and keep it at 60-80℃ for 30-60min;

[0129] 2. Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100°C for 30 minutes;

[0130] 3. Spray an ethanol solution of tris(trimethylsilyl) phosphate onto the surface of the dry metal mesh belt and keep it at 50°C for 55 minutes, and then keep it at 120°C for 1 hour to obtain an organosilicon coupling layer on the surface of the metal mesh belt;

[0131] The mass ratio of tris(trimethylsilyl)phosphate to ethanol is 1:7.5;

[0132] 4. Slowly add 3.0 kg of sodium tripolyphosphate to 100 kg of deionized water and stir for 18 minutes to obtain the phosphate solution;

[0133] 5. Spray the phosphate solution onto the surface of the metal mesh belt and bake it at 600° C. for 12 minutes to obtain a phosphate layer on the surface of the organosilicon coupling layer, that is, to obtain the high-temperature transmission mesh belt rust-proof layer.

[0134] The performance indicators of the anti-rust layer of the high-temperature transmission mesh belt prepared in the above examples and comparative examples are shown in Table 1.

[0135] Table 1 Performance indicators of the anti-rust layer of the high-temperature transmission mesh belt prepared in the embodiment and the comparative example

[0136]

[0137] As can be seen from Table 1, all test data of the anti-rust layer of the high-temperature transmission mesh belt prepared in Examples 1 to 6 are better than those in Comparative Examples 1 to 3.

[0138] This is because, in the high-temperature transmission mesh belt anti-rust layer prepared in Examples 1 to 6, the organosilicon coupling layer contains a phosphorus-containing organosilicon compound. Therefore, while the organosilicon coupling layer is chemically bonded to the surface of the metal mesh belt, the phosphorus-containing groups therein will further combine with the phosphate groups in the phosphate layer, greatly improving the adhesion of the coating; the phosphate groups in the phosphate layer will chelate with the metal on the surface of the metal mesh belt, and then form a dense passivation film layer after heating, further improving the adhesion and anti-corrosion and anti-rust properties; finally, when the composite powder is plasma sprayed, the silicon powder and carbon powder therein will in situ produce silicon carbide under the high-temperature environment of plasma spraying, and sprayed onto the phosphate layer, thereby enhancing the high-temperature resistance and rust resistance of the high-temperature transmission mesh belt anti-rust layer; at the same time, titanium dioxide will also react with the phosphorus-containing substances in the phosphate layer under the high-temperature environment of plasma spraying to produce titanium phosphate, further enhancing the adhesion of the anti-rust layer, and further improving the high-temperature resistance and rust resistance of the high-temperature transmission mesh belt anti-rust layer. Finally, borates will melt under the high temperature environment of plasma spraying, which not only plays a fluxing role, but also can fill the pores of the coating during the spraying process and enhance the adhesion of the anti-rust layer.

[0139] In Comparative Example 1, since there is no organosilicon coupling layer, there is no chemical bond between the organosilicon coupling layer and the surface of the metal mesh belt, and the phosphorus-containing groups therein are not combined with the phosphate groups in the phosphate layer; thus, the surface of the metal mesh belt can only be directly combined with the phosphate layer, and the adhesion of the formed coating is reduced, but the phosphate layer and the Ti-C-Si-B composite layer still exist, so it still has certain high temperature resistance and rust resistance.

[0140] In Comparative Example 2, since there is no phosphate layer, the composite layer is directly sprayed on the surface of the silicone coupling layer, and the titanium dioxide will not react with the phosphorus-containing substances in the phosphate layer under high temperature to produce titanium phosphate. Therefore, interlayer peeling is also prone to occur, resulting in the falling off of the rust-proof layer, and the high temperature resistance and rust-proof performance are greatly reduced.

[0141] In Comparative Example 3, since there is no Ti-C-Si-B composite layer, the effect of titanium dioxide reacting with the phosphorus-containing substances in the phosphate layer under high temperature to produce titanium phosphate will not occur, and there is no effect of borate fluxing and filling the pores of the coating under high temperature environment of plasma spraying. However, there is still the combination of the organic silicon coupling layer on the surface of the metal mesh belt through chemical bonds, and the combination of the phosphorus-containing groups therein with the phosphate groups in the phosphate layer. Therefore, the coating adhesion is better than that of Comparative Examples 1 and 2, but the high temperature resistance and rust resistance are significantly poor due to the lack of the Ti-C-Si-B composite layer.

[0142] The above results show and describe the basic principles and main features of this application as well as the advantages of this application.

[0143] Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. Such changes and improvements are intended to fall within the scope of the present application. The scope of protection claimed in the present application is defined by the equivalents of the appended claims.

Claims

1. A high-temperature transmission mesh belt anti-rust layer, characterized in that: The high-temperature transmission mesh belt rust-proof layer comprises, from the inside to the outside, an organosilicon coupling layer (1), a phosphate layer (2), and a Ti-C-Si-B composite layer (3); the organosilicon coupling layer (1) comprises a phosphorus-containing organosilicon compound; the phosphorus-containing organosilicon compound comprises one or both of tris(trimethylsilyl)phosphite and tris(trimethylsilyl)phosphate; the Ti-C-Si-B composite layer (3) is formed by plasma spraying; the Ti-C-Si-B composite layer (3) comprises titanium dioxide, carbon powder, silicon powder, and borate.

2. The high-temperature transmission mesh belt anti-rust layer according to claim 1, characterized in that: The borate comprises one or both of potassium borate and sodium tetraborate; and in the Ti-C-Si-B composite layer (3), the mass ratio of titanium dioxide, carbon powder, silicon powder and borate is (40-60): (10-15): (25-40): (5-10).

3. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to any one of claims 1 to 2, characterized in that: The steps include: The surface of the metal mesh belt is cleaned and degreased, then sandblasted, and then immersed in a 5M NaOH solution at 60-80°C for 30-60 minutes; Take out the metal mesh belt and wash it with deionized water, then dry it in an oven at 100-110°C for 20-30 minutes; Spraying an ethanol solution of a phosphorus-containing organosilicon compound onto the surface of a dried metal mesh belt and keeping the temperature at 50-60° C. for 30-60 minutes, and then keeping the temperature at 100-120° C. for 1-2 hours, to obtain an organosilicon coupling layer (1) on the surface of the metal mesh belt; Spraying a phosphate solution onto the surface of the metal mesh belt and baking it at a temperature of 400 to 640° C. for 10 to 20 minutes to obtain a phosphate layer (2) on the surface of the organosilicon coupling layer (1); Weigh titanium dioxide, carbon powder, silicon powder, and borate according to the mass ratio, and ball-mill and mix for 3 to 5 hours to obtain a Ti-C-Si-B mixed powder; The plasma spraying power, plasma gas flow rate, and the distance between the substrate and the nozzle are controlled to spray the composite powder onto the surface of the phosphate layer (2) to obtain a Ti-C-Si-B composite layer (3), that is, the high-temperature transmission mesh belt rust-proof layer.

4. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: In the ethanol solution of the phosphorus-containing organosilicon compound, the mass ratio of the phosphorus-containing organosilicon compound to ethanol is 1:(5-8).

5. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: The phosphate solution is prepared by slowly adding 0.8 to 8.0 kg of phosphate into 100 kg of deionized water and stirring for 10 to 30 minutes to obtain the phosphate solution.

6. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 5, characterized in that: The phosphate used in the phosphate solution includes one or more of sodium tripolyphosphate, sodium pyrophosphate, sodium tetrapolyphosphate and sodium hexametaphosphate.

7. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: The average particle size of the Ti-C-Si-B mixed powder is 50-100 μm.

8. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: The plasma spraying power is 20-30 kW.

9. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: The plasma gas flow rate is 50 to 80 L / min.

10. The method for preparing the anti-rust layer of the high-temperature transmission mesh belt according to claim 3, characterized in that: The distance between the substrate and the nozzle is 100-150 mm.

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