High-wear-resistance stainless steel-based composite coating, preparation method and application of high-wear-resistance stainless steel-based composite coating on cabinet door plate

Abstract

The invention relates to the field of coating materials, and provides a high-wear-resistance stainless steel-based composite coating which is composed of dumbbell-shaped silver-doped silicon carbide, sea urchin-shaped titanium dioxide, 304 stainless steel powder, NiCrBSi nickel-based autolytic alloy powder and the like. The silver-doped silicon carbide is prepared through sol-gel, high-temperature carbonization and acid pickling, and the titanium dioxide filler is obtained through hydrothermal synthesis and calcination. Supersonic flame spraying deposition is adopted, the compactness and bonding strength are enhanced through laser remelting, and finally the wear resistance, the pollution resistance and the antibacterial performance are improved through vacuum annealing, mechanical polishing and hydrophobic coating modification. The design of dumbbell-shaped silver-doped silicon carbide and urchin-shaped titanium dioxide is adopted, high-wear-resistance, antibacterial and high-binding-force coating performance is achieved, the problems of wear resistance and bacteriostasis are solved, and the coating is suitable for the fields of cabinet door plates and the like.

Claims

1. A highly wear-resistant stainless steel-based composite coating, characterized in that: The invention comprises the following raw materials in parts by weight: 10.0 to 20.0 parts of dumbbell-shaped silver-doped silicon carbide filler, 5.0 to 15.0 parts of sea urchin-shaped titanium dioxide filler, 25.0 to 30.0 parts of 304 stainless steel powder, 20.0 to 30.0 parts of NiCrBSi nickel-based self-soluble alloy powder, 0.5 to 3.0 parts of boron oxide filler, 5.0 to 15.0 parts of nano-alumina filler, 3.0 to 10.0 parts of nano-zirconia filler, 2.0 to 5.0 parts of boron nitride filler, and 0.5 to 3.0 parts of rare earth oxide; The dumbbell-shaped silver-doped silicon carbide filler is prepared by a sol-gel method combined with a high-temperature carbonization and acid washing purification process; The sea urchin-shaped titanium dioxide is prepared by a hydrothermal synthesis method combined with high-temperature calcination.

2. A highly wear-resistant stainless steel-based composite coating as claimed in claim 1, characterized in that: The preparation method of the dumbbell-shaped silver-doped silicon carbide filler is as follows: 10.0-50.0 parts of glucose and 10.0 parts of tetraethoxysilane are used as raw materials, mixed in a mass ratio of (1-5):1, the mixed raw materials are placed in a stirring kettle, the stirring rate is 500-800 rpm, the stirring time is 30-60 minutes, until a uniform solution is formed, then 2.0-5.0 parts of 0.01 mol / L hydrochloric acid are added to the solution, and the pH is adjusted to 3.0-5.0, The stirring rate is maintained at 300-500 rpm for 20-40 minutes to form a uniform gel, the obtained gel solution is heated to 50-80°C, the temperature is increased at a heating rate of 2-5°C / min, the heat preservation time is 12-24 hours, and the constant temperature stirring is maintained at 50-80°C until the solvent evaporates to form a solid precursor, the precursor is placed in a vacuum drying oven, and dried at a temperature of 80-120°C for 6-12 hours to obtain a carbon-silicon composite precursor powder, and the dried powder is Redisperse in 100-120 parts of ethanol, stir at a stirring rate of 500-800 rpm for 20-30 min to form a suspension, then slowly add 2.0-4.5 parts of 0.05 mol / L silver nitrate solution, keep stirring at a constant temperature of 25-40°C for 30-45 min, then transfer the mixed solution to a vacuum drying oven, dry at 60-80°C to constant weight, collect the solid powder and place it in a tube furnace, and heat it at a heating rate of 5-10°C / min under an argon atmosphere. The product is heated to 1200-1600° C., kept warm for 120-240 minutes, and naturally cooled to room temperature. The product is then immersed in a 1 mol / L hydrochloric acid solution for 30-60 minutes for pickling. The product is separated by a centrifuge at 5000-8000 rpm for 5-10 minutes. The precipitate is washed with deionized water for 3-5 times, each time with an amount of 3-5 times the volume of the precipitate. Finally, the product is dried in a vacuum drying oven at 80-120° C. for 6-12 hours to obtain a dumbbell-shaped silver-doped silicon carbide filler.

3. A highly wear-resistant stainless steel-based composite coating as claimed in claim 1 or 2, characterized in that: The dumbbell-shaped silver-doped silicon carbide filler has an average length of 200 to 600 nm, an average diameter of the neck of 65 to 200 nm, and an average diameter of the end of 90 to 400 nm.

4. A highly wear-resistant stainless steel-based composite coating as claimed in claim 3, characterized in that: The silver doping amount of the dumbbell-shaped silver-doped silicon carbide filler is 1.5-3.0 at.%.

5. The highly wear-resistant stainless steel-based composite coating according to claim 1, characterized in that: The preparation method of the sea urchin-shaped titanium dioxide filler is as follows: tetrabutoxytitanium, 1 mol / L sodium hydroxide aqueous solution and ethylene glycol are used as raw materials, and the mixture is mixed in a volume ratio of (0.3-0.5 mL): (20-40 mL): (30-50 mL), the mixed solution is placed in a stirring container and stirred at a rate of 300-600 rpm for 10-30 minutes, and then transferred to an ultrasonic device, and treated at a frequency of 40-60 kHz for 3-10 minutes to obtain a uniform dispersion system, and the dispersion system is injected into a polytetrafluoroethylene hydrothermal reactor, and the temperature is increased to 160-200° C. at 2-5° C. / min and kept warm for 8-16 hours, and the reaction is carried out. After completion, cool to 25-30°C at 2-5°C / min, then add 0.1-0.5M hydrochloric acid to the coolant to adjust the pH to 6-7, centrifuge at 5000-10000rpm for 5-10min to obtain a precipitate, wash the precipitate 3-5 times with a 0.1mol / L hydrochloric acid / deionized water mixture with a volume ratio of 1:1, and use 30-50ml each time. After drying the precipitate in a vacuum drying oven at 50-80°C for 8-16h, transfer it to a tubular furnace and heat it to 500-600°C at 2-10°C / min, calcine it for 60-120min, and finally grind it to obtain a sea urchin-shaped titanium dioxide filler.

6. A highly wear-resistant stainless steel-based composite coating as claimed in claim 5, characterized in that: The fluorine-containing polyol is a mixture of polycarbonate diol and trifluoroacetaldehyde hydrate, and the mass ratio thereof is (40-60%): (60-40%).

7. A highly wear-resistant stainless steel-based composite coating as claimed in claim 1, characterized in that: The average diameter of the sea urchin-shaped titanium dioxide filler is 1.5-4.5 μm, and the thorn-like branches on its surface are composed of nano-scale titanium dioxide whiskers of 100-200 nm.

8. The highly wear-resistant stainless steel-based composite coating according to claim 1, characterized in that: The rare earth oxide is yttrium oxide or lanthanum oxide.

9. A method for preparing a highly wear-resistant stainless steel-based composite coating according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Pretreatment of substrate material: cold-rolled low-carbon steel plate and aluminum alloy plate are used as substrate materials, and mechanical sandblasting is performed in sequence, with 80-120 mesh brown corundum sand used for sandblasting, sandblasting pressure of 0.4-0.6 MPa, and surface roughness Ra = 3.2-6.3 μm), followed by alkaline degreasing. The specific process is to immerse the treated base material in an alkaline degreasing agent at 60-80°C and pH 10-12 for ultrasonic cleaning for 5-10 minutes, and then treat it in a 10wt.%% dilute hydrochloric acid solution at room temperature for 30-60 seconds, and then wash with water and dry to complete the pretreatment; S2. Raw material mixing and powder preparation: dumbbell-shaped silver-doped silicon carbide filler, sea urchin-shaped titanium dioxide filler, 304 stainless steel powder, NiCrBSi nickel-based self-soluble alloy powder, boron oxide filler, nano-alumina filler, nano-zirconia filler, boron nitride filler and rare earth oxide are put into a three-dimensional mixer, uniformly mixed at a speed of 15 to 25 rpm for 60 to 90 minutes under argon protection, and then sieved through a 150 to 200 mesh sieve for 3 times to obtain a composite spray powder with uniform composition; S3: Supersonic flame spray deposition: Use supersonic flame spray equipment, set the kerosene flow rate to 22-26L / h, and the oxygen flow rate to 750-850m 3 / h, powder feeding rate 35 ~ 45g / min, deposition on the substrate surface preheated to 160 ~ 220 ℃ at a spray distance of 280 ~ 320mm, divided into 3 to 5 spraying passes, single layer thickness controlled to 30 ~ 50μm, interlayer cooling temperature ≤ 80℃ to avoid thermal stress accumulation; S4. Laser remelting and surface densification: Use fiber laser to remelt the coating, the parameters are set as spot diameter 2-4 mm, scanning rate 10-15 mm / s, overlap rate 30-40%, argon curtain protection, gas flow rate 15-25 L / min, and controlled cooling rate 50-80 ° C / s; S5: Precision post-processing and surface finishing: Place the coating in a vacuum annealing furnace and keep it at 180-240℃ for 2-4h to eliminate internal stress, then use 800-1500 mesh sand belt for mechanical polishing to reduce the surface roughness to Ra≤0.8μm, finally spray heptafluorodecyltrimethoxysilane coating with a thickness of 1.0-3.0μm, and cure it at 120-150℃ for 20-30min to form an anti-fingerprint and pollution-resistant inert surface.

10. Use of the high wear-resistant stainless steel-based composite coating according to any one of claims 1 to 8 or the high wear-resistant stainless steel-based composite coating prepared by the preparation method according to claim 9 on a cabinet door panel.

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