A wear-resistant hydrophobic coating and a method for preparing the same

Abstract

The present application relates to a kind of wear-resistant hydrophobic coating and its preparation method, belong to the technical field of A.A kind of preparation method of wear-resistant hydrophobic coating includes the following steps: the metal substrate after cleaning is pretreated, is placed in vacuum coating furnace and is preheated, ion etching, using Ti-Cr composite target material is carried out Ti-Cr composite sputtering treatment, WC target sputtering treatment, then carries out multi-arc ion plating deposition ta-C layer processing and multi-arc ion plating deposition F-ta-C layer processing, then carries out heat treatment, that is, preparation is completed.The present application is prepared by introducing titanium powder, forming solid solution between metal substrate and chromium, and forming a variety of component stable compounds on its surface, titanium is used as intermediate layer, provides support force, makes each layer element gradient distribution, improves the binding force between chromium element and glass matrix, improves the compactness and uniformity of metal substrate, improves the wear resistance of metal mold, reduces segregation phenomenon.

Description

Technical Field

[0001] This invention belongs to the technical field of A, and relates to a wear-resistant hydrophobic coating and its preparation method. Background Technology

[0002] With the increasing demand for plastics and rubber in industrial production, the quality and efficiency of plastic molding are receiving more and more attention. Traditional plastic / rubber molding molds, due to their lack of coating, have high surface energy, making them prone to adhesion between the plastic / rubber and the mold, resulting in poor mold release properties and ultimately affecting product quality and mold life. Simultaneously, friction between plastic / rubber additives and the uncoated mold can also shorten mold life. Furthermore, plastic / rubber additives can be highly corrosive to the mold, causing corrosion and shortening its lifespan. With the development of coating technology, plastic / rubber molding molds are now coated with CrN or DLC coatings. These coatings effectively improve the mold's wear resistance, release properties, and corrosion resistance, significantly increasing production efficiency and quality. However, due to further increases in molding efficiency and quality requirements, faster molding cycles, and higher molding temperatures, the demand for better release properties has become even greater, and traditional CrN and DLC coatings often fail to meet these requirements. Later, DLC+AF coating was developed to solve the demolding problem. However, due to the poor wear resistance of AF coating, the coated mold performed well at the beginning of use, but the demolding performance deteriorated quickly due to the wear and tear of AF coating, and the mold life was limited. Summary of the Invention

[0003] The purpose of this invention is to provide a wear-resistant hydrophobic coating and its preparation method. By introducing titanium powder, a solid solution is formed between the metal substrate and chromium, and a variety of stable compounds are formed on its surface. Titanium is used as an intermediate layer to provide support, so that the elements in each layer are distributed in a gradient, which improves the bonding force between chromium and the glass substrate. Titanium diffuses into the metal substrate through thermal diffusion in a high melting environment. As an intermediate layer, the high melting temperature facilitates the rapid diffusion of titanium. The lower melting temperature in the later stage helps to refine the grains, improve the density and uniformity of the metal substrate, improve the wear resistance of the metal mold, and reduce segregation.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for preparing a wear-resistant hydrophobic coating includes the following steps:

[0006] 1) The cleaned metal substrate is pretreated, placed in a vacuum coating furnace for preheating, and then ion etched to obtain the preform;

[0007] 2) The preform was subjected to Ti-Cr composite sputtering treatment with a Ti-Cr composite target and WC target sputtering treatment to obtain an intermediate;

[0008] 3) The intermediate is subjected to multi-arc ion plating to deposit a ta-C layer and multi-arc ion plating to deposit an F-ta-C layer, followed by heat treatment, and the preparation is complete.

[0009] As a preferred embodiment of the present invention, the pretreatment in step 1) is performed at 5×10 -2 Baking at 350-450℃ for 4-6 hours under vacuum, followed by oven cooling to 70℃ before removal from the oven. The preheating process involves heating to 230-250℃ and holding for 2.0-2.5 hours, then evacuating the oven to a vacuum level of 5×10⁻⁶ Pa. -4 Pa, the ion etching is carried out in an argon atmosphere, at a pressure of 0.6-2.5 Pa, with a filament current of 40 A, an auxiliary anode voltage of 60 V, a bias voltage of 120 V, and an etching time of 1 h.

[0010] As a preferred embodiment of the present invention, the Ti-Cr composite sputtering treatment in step 2) is carried out in an argon atmosphere at a temperature of 150°C, a gas pressure of 0.4-0.8 Pa, a sputtering power of 6 KW, a bias voltage of 150 V, and a deposition time of 40 min. The WC target sputtering treatment is carried out in an argon atmosphere at a temperature of 150°C, a gas pressure of 0.4-0.8 Pa, a sputtering power of 5.5 KW, a bias voltage of 120 V, and a deposition time of 60 min.

[0011] As a preferred embodiment of the present invention, the multi-arc ion plating deposition of the ta-C layer in step 3) is performed at a furnace temperature of 70°C and a temperature of 5×10⁻⁶ m² / h. -4 The process involves: setting a vacuum level of Pa, turning on a multi-arc C target with a current of 45A, a bias voltage of 800V, a bias pulse frequency of 50KHz, a duty cycle of 5-10%, and depositing for 3 hours; then, for the multi-arc ion plating process to deposit the F-ta-C layer, which involves introducing CF4 gas into the furnace at a flow rate of 8-12 SCCM, maintaining a multi-arc C target current of 45A, a bias voltage of 300V, a bias pulse frequency of 20KHz, a duty cycle of 5-10%, and depositing for 3 hours. After that, adjusting the CF4 gas flow rate to 12-16 SCCM, maintaining a multi-arc C target current of 50A, a bias voltage of 80V, a bias pulse frequency of 20KHz, a duty cycle of 5-10%, and continuing deposition for 1 hour; and finally, annealing at 500-560℃ for 5-6 hours, air cooling to 450-480℃ for annealing for 1.0-1.5 hours, and then heat-treating at 620-650℃ for 2-3 hours.

[0012] As a preferred technical solution of the present invention, the preparation method of the Ti-Cr composite target material includes the following steps: mixing titanium powder, chromium powder and nickel powder, placing them in a ball mill, and ball milling them under an argon atmosphere. The resulting mixture is placed in a graphite mold for vacuum hot pressing treatment, and after cooling, the target material is obtained.

[0013] As a preferred technical solution of the present invention, the vacuum hot pressing treatment in the preparation of Ti-Cr composite target material is to evacuate to 5 Pa, then heat to 1000-1100℃ at a heating rate of 5-8℃ / min, and hold at that temperature for 1.5-2.0h.

[0014] As a preferred technical solution of the present invention, in the heat preservation process of the vacuum hot pressing treatment in the preparation of Ti-Cr composite target material, pressure is applied after heat preservation for 30 minutes, the pressure is 50 MPa, and the pressure holding time is 40 minutes.

[0015] As a preferred technical solution of the present invention, the cooling process in the preparation of Ti-Cr composite target material involves reducing the temperature to 650-700℃, reducing the pressure to 15-20MPa, and then continuing to cool down to room temperature.

[0016] As a preferred embodiment of the present invention, in the preparation of Ti-Cr composite target material, the particle size of the titanium powder is 30-50 μm, the particle size of the chromium powder is 50-80 μm, the ball milling speed is 10-15 rpm, the ball milling time is 20-24 h, and the mass ratio of the titanium powder, chromium powder and nickel powder is 7-8:2.0-2.2:0.09-0.10.

[0017] The beneficial effects of this invention are:

[0018] This invention introduces titanium powder to form a solid solution between a metal substrate and chromium, and forms a variety of stable compounds on its surface. Titanium serves as an intermediate layer to provide support, creating a gradient distribution of elements between the layers. This improves the bonding force between chromium and the glass matrix. Titanium diffuses into the metal substrate through thermal diffusion under a high melting environment. As an intermediate layer, the high melting temperature facilitates rapid infiltration of titanium, while the lower melting temperature in the later stages helps refine the grains, improves the density and uniformity of the metal substrate, enhances the wear resistance of the metal mold, and reduces segregation. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0020] Example 1

[0021] A method for preparing a wear-resistant hydrophobic coating includes the following steps:

[0022] 1) After cleaning, the metal substrate is subjected to 5×10 -2Baked at 350℃ for 4 hours under vacuum, then cooled to 70℃ in the furnace before being removed and placed in a vacuum coating furnace. The furnace is then heated to 230℃ and held for 2 hours, with the vacuum level reduced to 5×10⁻⁶. -4 Pa, under an argon atmosphere and a gas pressure of 0.6 Pa, with a filament current of 40 A, an auxiliary anode voltage of 60 V, a bias voltage of 120 V, and an etching time of 1 h, a preform was obtained;

[0023] 2) The preform was deposited using a Ti-Cr composite target in an argon atmosphere at 150°C, 0.4Pa pressure, 6KW sputtering power, 150V bias, and 40min, and a WC target was deposited in an argon atmosphere at 150°C, 0.4Pa pressure, 5.5KW sputtering power, 120V bias, and 60min to obtain an intermediate.

[0024] 3) The intermediate was subjected to an in-furnace temperature of 70℃ and a temperature of 5×10⁻⁶ ppm. -4 With a vacuum level of Pa, the multi-arc C target was turned on with a current of 45A, a bias voltage of 800V, a bias pulse frequency of 50KHz, and a duty cycle of 5%, and deposition was carried out for 3 hours. CF4 gas was introduced into the furnace at a flow rate of 8SCCM, and the multi-arc C target current of 45A, a bias voltage of 300V, a bias pulse frequency of 20KHz, and a duty cycle of 5% were maintained. After deposition for 3 hours, the CF4 gas flow rate was adjusted to 12SCCM, the multi-arc C target current was 50A, the bias voltage was 80V, the bias pulse frequency was 20KHz, and the duty cycle was 5%, and deposition was continued for 1 hour. Then, it was annealed at 500℃ for 5 hours, air-cooled to 450℃ for annealing for 1 hour, and then heat-treated at 620℃ for 2 hours to complete the preparation.

[0025] The preparation method of the Ti-Cr composite target includes the following steps: mixing 30μm titanium powder, 50μm chromium powder, and 30μm nickel powder, placing them in a ball mill, and ball milling at 10rpm for 20h under an argon atmosphere. The resulting mixture is placed in a graphite mold, evacuated to 5Pa, heated to 1000℃ at a heating rate of 5℃ / min, and held at that temperature for 1.5h. After holding at that temperature for 30min, pressure is applied at 50MPa for 40min. After the temperature drops to 650℃, the pressure is reduced to 15MPa, and then the temperature is further reduced to room temperature to obtain the target. The mass ratio of titanium powder, chromium powder, and nickel powder is 7:2.0:0.09.

[0026] Example 2

[0027] A method for preparing a wear-resistant hydrophobic coating includes the following steps:

[0028] 1) After cleaning, the metal substrate is subjected to 5×10 -2Baked at 400℃ for 5 hours under vacuum, then cooled to 70℃ in the furnace before being removed and placed in a vacuum coating furnace. The furnace is then heated to 240℃ and held for 2.2 hours, with the vacuum level reduced to 5×10⁻⁶. -4 Pa, under an argon atmosphere and a gas pressure of 1.5 Pa, with a filament current of 40 A, an auxiliary anode voltage of 60 V, a bias voltage of 120 V, and an etching time of 1 h, a preform was obtained;

[0029] 2) The preform was deposited using a Ti-Cr composite target in an argon atmosphere at 150°C, 0.6Pa pressure, 6KW sputtering power, 150V bias, and 40min, and a WC target was deposited in an argon atmosphere at 150°C, 0.6Pa pressure, 5.5KW sputtering power, 120V bias, and 60min to obtain an intermediate.

[0030] 3) The intermediate was subjected to an in-furnace temperature of 70℃ and a temperature of 5×10⁻⁶ ppm. -4 With a vacuum level of Pa, the multi-arc C target was turned on with a current of 45A, a bias voltage of 800V, a bias pulse frequency of 50KHz, and a duty cycle of 8%, and deposition was carried out for 3 hours. CF4 gas was introduced into the furnace at a flow rate of 10SCCM, and the multi-arc C target current of 45A, a bias voltage of 300V, a bias pulse frequency of 20KHz, and a duty cycle of 8% were maintained. After deposition for 3 hours, the CF4 gas flow rate was adjusted to 14SCCM, the multi-arc C target current was 50A, the bias voltage was 80V, the bias pulse frequency was 20KHz, and the duty cycle was 8%, and deposition was continued for 1 hour. Then, it was annealed at 530℃ for 5.5 hours, air-cooled to 465℃ for annealing for 1.2 hours, and then heat-treated at 635℃ for 2.5 hours to complete the preparation.

[0031] The preparation method of Ti-Cr composite target material includes the following steps: mixing 40μm titanium powder, 60μm chromium powder, and 40μm nickel powder, placing them in a ball mill, and ball milling at 12rpm for 22h under an argon atmosphere. The resulting mixture is placed in a graphite mold, evacuated to 5Pa, heated to 1050℃ at a heating rate of 6℃ / min, and held at that temperature for 1.8h. After holding at that temperature for 30min, pressure is applied at 50MPa for 40min. After the temperature drops to 675℃, the pressure is reduced to 18MPa, and then the temperature is further reduced to room temperature to obtain the target material. The mass ratio of titanium powder, chromium powder, and nickel powder is 7.5:2.1:0.095.

[0032] Example 3

[0033] A method for preparing a wear-resistant hydrophobic coating includes the following steps:

[0034] 1) After cleaning, the metal substrate is subjected to 5×10 -2Baked at 450℃ for 6 hours under vacuum, then cooled to 70℃ in the furnace before being removed and placed in a vacuum coating furnace. The furnace is then heated to 250℃ and held for 2.5 hours, with the vacuum level reduced to 5×10⁻⁶. -4 Pa, under an argon atmosphere and a gas pressure of 2.5 Pa, with a filament current of 40 A, an auxiliary anode voltage of 60 V, a bias voltage of 120 V, and an etching time of 1 h, a preform was obtained;

[0035] 2) The preform was deposited using a Ti-Cr composite target in an argon atmosphere at 150°C, 0.8 Pa pressure, 6 KW sputtering power, 150 V bias, and 40 min, and a WC target was deposited in an argon atmosphere at 150°C, 0.8 Pa pressure, 5.5 KW sputtering power, 120 V bias, and 60 min to obtain an intermediate.

[0036] 3) The intermediate was subjected to an in-furnace temperature of 70℃ and a temperature of 5×10⁻⁶ ppm. -4 With a vacuum level of Pa, the multi-arc C target was turned on with a current of 45A, a bias voltage of 800V, a bias pulse frequency of 50KHz, and a duty cycle of 10%, and deposition was carried out for 3 hours. CF4 gas was introduced into the furnace at a flow rate of 12SCCM, and the multi-arc C target current of 45A, a bias voltage of 300V, a bias pulse frequency of 20KHz, and a duty cycle of 10% were maintained. After deposition for 3 hours, the CF4 gas flow rate was adjusted to 16SCCM, the multi-arc C target current was 50A, the bias voltage was 80V, the bias pulse frequency was 20KHz, and the duty cycle was 10%, and deposition was continued for 1 hour. Then, it was annealed at 560℃ for 6 hours, air-cooled to 480℃ for annealing for 1.5 hours, and then heat-treated at 650℃ for 3 hours. The preparation was then completed.

[0037] The preparation method of the Ti-Cr composite target includes the following steps: mixing 50μm titanium powder, 80μm chromium powder, and 50μm nickel powder, placing them in a ball mill, and ball milling at 15rpm for 24h under an argon atmosphere. The resulting mixture is placed in a graphite mold, evacuated to 5Pa, heated to 1100℃ at a heating rate of 8℃ / min, and held at that temperature for 2.0h. After holding at that temperature for 30min, pressure is applied at 50MPa for 40min. After the temperature drops to 700℃, the pressure is reduced to 20MPa, and then the temperature is further reduced to room temperature to obtain the target. The mass ratio of titanium powder, chromium powder, and nickel powder is 8:2.2:0.10.

[0038] Comparative Example 1

[0039] The difference is that Comparative Example 1 uses chromium powder instead of titanium powder, while the rest is the same as Example 3.

[0040] Comparative Example 2

[0041] The difference is that Comparative Example 2 does not use nickel powder, but otherwise it is the same as Example 3.

[0042] Comparative Example 3

[0043] The difference lies in the heat treatment of step 3) of Comparative Example 3, which is annealing at 560°C for 7.5 hours and heat treatment at 650°C for 3 hours. The rest is the same as in Example 3.

[0044] Comparative Example 4

[0045] The difference in Comparative Example 4 is that the heat treatment is annealing at 480°C for 7.5 hours and heat treatment at 650°C for 3 hours, while the rest is the same as in Example 3.

[0046] The performance of Examples 1-3 and Comparative Examples 1-4 was tested as follows, and the test results are shown in Table 1.

[0047] Adhesion strength (critical load) test: Measured using a scratch tester, reflecting the bonding strength between the coating and the substrate, in N.

[0048] Wear rate test: The wear rate was determined using a ball-and-disc friction and wear tester (load 5N, rotation speed 300r / min).

[0049] Water contact angle test: Measured using a contact angle meter, reflecting hydrophobicity.

[0050] Table 1

[0051]

[0052] As shown in Table 1, compared with Comparative Examples 1-4, Examples 1-3, through the reasonable setting of vacuum baking and argon etching pretreatment of the metal substrate, the ratio of titanium powder, chromium powder and nickel powder in the Ti-Cr composite target, and subsequent sputtering deposition, multi-arc C target deposition and segmented heat treatment processes, not only enhance the interfacial bonding by forming a stable solid solution between titanium and iron in the steel substrate, but also suppress the formation of the brittle phase (TiCr2) of Ti-Cr during high temperature by nickel powder, and simultaneously utilize CF4 gas to construct a hydrophobic surface structure, ultimately achieving synergistic optimization of bonding force, wear resistance and hydrophobicity; while Comparative Example 1, because it uses chromium powder instead of titanium powder, loses the solid solution bonding between titanium and iron. The effects of these factors significantly reduced the adhesion reliability between the coating and the substrate, making the coating prone to peeling and thus exacerbating wear. The hydrophobicity was also affected by the damage to the coating's integrity. In Comparative Example 2, due to the absence of nickel powder, Ti-Cr spontaneously formed a large number of brittle phases at high temperatures, resulting in a deterioration in the mechanical properties of the coating. Both the adhesion and wear resistance were significantly worse, and surface defects also weakened the hydrophobicity. In Comparative Examples 3-4, due to improper heat treatment temperature and time, the titanium element did not penetrate sufficiently into the steel substrate, resulting in coarse coating grains. This weakened the interfacial bonding strength and reduced the density of the coating structure, ultimately making the wear resistance and hydrophobicity inferior to the examples. This fully demonstrates the key regulatory role of component ratio and process parameters on the core performance of coatings on steel substrates.

[0053] Comparative Example 1 lacks titanium powder, which cannot serve as an intermediate layer to form a solid solution between the metal substrate and chromium. This reduces the bonding strength of the internal structure, leading to a decrease in structural stability. In Comparative Example 2, without the addition of Ni powder, the Ti-Cr composite target will spontaneously form a large amount of brittle TiCr2 intermetallic compound phase during the high-temperature sintering process, which will have a series of negative impacts on the target preparation process, mechanical properties, reliability, and the final wear-resistant coating performance. The heat treatment methods of Comparative Examples 3 and 4 are different, and titanium cannot penetrate quickly, resulting in coarse grains and affecting its dispersibility, leading to a decrease in its mechanical properties.

[0054] In summary, this invention introduces titanium powder to form a solid solution between the metal substrate and chromium, and forms a variety of stable compounds on its surface. Titanium serves as an intermediate layer to provide support, creating a gradient distribution of elements between the layers. This improves the bonding force between chromium and the glass matrix. Titanium diffuses into the metal substrate through thermal diffusion under a high melting environment. As an intermediate layer, the high melting temperature facilitates rapid infiltration of titanium, while the lower melting temperature in the later stages helps refine the grains, improves the density and uniformity of the metal substrate, enhances the wear resistance of the metal mold, and reduces segregation.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a wear-resistant hydrophobic coating, characterized in that, The preparation method includes the following steps: 1) The cleaned metal substrate is pretreated, placed in a vacuum coating furnace for preheating, and then ion etched to obtain the preform; 2) The preform was subjected to Ti-Cr composite sputtering treatment with a Ti-Cr composite target and WC target sputtering treatment to obtain an intermediate; 3) The intermediate is subjected to multi-arc ion plating to deposit a Ta-C layer and multi-arc ion plating to deposit an F-Ta-C layer, followed by heat treatment to complete the preparation; wherein, the heat treatment is annealing at 500-560℃ for 5-6 hours, air cooling to 450-480℃ for annealing for 1.0-1.5 hours, and heat treatment at 620-650℃ for 2-3 hours; The preparation method of the Ti-Cr composite target includes the following steps: mixing titanium powder, chromium powder and nickel powder, placing them in a ball mill, and ball milling them under an argon atmosphere. The resulting mixture is placed in a graphite mold for vacuum hot pressing treatment. After cooling, the target is obtained. The mass ratio of titanium powder, chromium powder and nickel powder is 7-8:2.0-2.2:0.09-0.

10.

2. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: The preprocessing described in step 1) is performed at 5×10 -2 Baking at 350-450℃ for 4-6 hours under vacuum, followed by oven cooling to 70℃ before removal from the oven. The preheating process involves heating to 230-250℃ and holding for 2.0-2.5 hours, then evacuating the oven to a vacuum level of 5×10⁻⁶ Pa. -4 Pa.

3. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: The ion etching described in step 1) is carried out in an argon atmosphere, at a pressure of 0.6-2.5 Pa, with a filament current of 40A, an auxiliary anode voltage of 60V, a bias voltage of 120V, and an etching time of 1 hour.

4. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: The Ti-Cr composite sputtering treatment described in step 2) is carried out in an argon atmosphere at a temperature of 150°C, a gas pressure of 0.4-0.8 Pa, a sputtering power of 6 kW, a bias voltage of 150 V, and a deposition time of 40 min.

5. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: The WC target sputtering process described in step 2) is carried out in an argon atmosphere at a temperature of 150°C, a gas pressure of 0.4-0.8 Pa, a sputtering power of 5.5 KW, a bias voltage of 120 V, and a deposition time of 60 min.

6. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: Step 3) describes the multi-arc ion plating deposition of the ta-C layer, which is performed at a furnace temperature of 70°C and a temperature of 5×10⁻⁶ ppm. -4 Vacuum level of Pa, multi-arc C target current of 45A, bias voltage of 800V, bias pulse frequency of 50KHz, duty cycle of 5-10%, deposition time of 3h.

7. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: Step 3) describes the multi-arc ion plating process for depositing the F-ta-C layer, which involves introducing CF4 gas into the furnace at a flow rate of 8-12 SCCM, maintaining a multi-arc C target current of 45 A, a bias voltage of 300 V, a bias pulse frequency of 20 kHz, and a duty cycle of 5-10%. After 3 hours of deposition, the CF4 gas flow rate is adjusted to 12-16 SCCM, the multi-arc C target current is 50 A, the bias voltage is 80 V, the bias pulse frequency is 20 kHz, the duty cycle is 5-10%, and deposition continues for another hour.

8. The method for preparing a wear-resistant hydrophobic coating according to claim 1, characterized in that: The vacuum hot pressing process involves evacuating to 5 Pa, heating to 1000-1100°C at a rate of 5-8°C / min, and holding at that temperature for 1.5-2.0 hours. During the holding period of the vacuum hot pressing process, pressure is applied after holding at that temperature for 30 minutes, with a pressure of 50 MPa applied and a holding time of 40 minutes. The cooling process involves reducing the pressure to 15-20 MPa after the temperature drops to 650-700°C and then continuing to cool down to room temperature.

9. A wear-resistant hydrophobic coating prepared by the preparation method according to any one of claims 1 to 8.

Images