Process of preparing nano composite ceramic coating in super-gravitational field

Abstract

The process of preparing nanometer composite ceramic coating in super-gravitational field includes: pouring solution for making composite ceramic coating into centrifuger, increasing the rotation speed of the centrifuging tank gradually to 1000-2000 rpm, maintaining the rotation speed for 1-100 min, raising the heating temperature gradually to 200-1000 deg.c under stable rotation speed, maintaining the temperature for 10-600 min, and cooling to room temperature. The super-gravitational field generated in the centrifuger applies one force perpendicular to the substrate surface to the colloid particle, chemical precipitate, ceramic powder, ceramic fiber, metal powder and metal fiber inside the solution to extrude them to the surface of the substrate; and the gradually raised temperature makes the solvent volatilize and the precipitate pyrolyze, oxidize, sinter, etc., so as to form controllable compact nanometer composite ceramic coating.

Description

technical field

[0001] The invention relates to the preparation of nanocomposite ceramic materials, in particular to the fields of material surface technology and supergravity field technology. Background technique

[0002] The sol-gel method is an important way to prepare ceramic thin films. The preparation of ceramic thin films by the sol-gel method has many advantages, such as low sintering temperature, nanostructure, uniform mixing of multi-components, easy control of components, uniform film formation, large-area thin films, low cost, and short cycle. Easy industrial production, etc. At present, various ceramic thin films have been successfully prepared by the sol-gel method, including ceramic thin films that improve the corrosion resistance of metals, and functional ceramic thin films such as superconductivity, ferroelectricity, catalysis, and separation. However, the sol-gel method can only prepare ceramic thin films, and the thickness is generally less than 0.5 μm....

Examples

Embodiment 1

[0017] Example 1: Al 2 o 3 -Y 2 o 3 Nano-micron composite ceramic coating

[0018] Prepare 0.1mol / L Al(NO 3 ) 3 +1wt%Y(NO 3 ) 3 Aqueous solution, and then add ammonia water dropwise to the solution and vigorously stir until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to obtain Al 2 o 3 -Y 2 o 3 colloidal solution. Thereafter, add 3% polyvinyl alcohol to the colloidal solution, heat it in a water bath at 80°C for 1 hour to fully dissolve it, and then add 50% Al to the colloidal solution. 2 o 3 Nano-powder and micro-powder, wherein nano-powder accounts for 70%, among 30% of micro-powder, 70% has a particle size of 10 μm, and 30% has a particle size of 74 μm. Use a high-energy ball mill to ball-mill the mixed solution for 4-6 hours. Al can be obtained 2 o 3 -Y 2 o 3 Sol-gel+Al 2 o 3 powder mixture. Inject this mixture into figure 2 Tube neutralization of the device image 3 in the sample com...

Embodiment 2

[0019] Example 2: ZrO 2 -Y 2 o 3 Nano-micron composite ceramic coating

[0020] Prepare 0.1mol / L Zr(NO 3 ) 4 +8wt%Y(NO 3 ) 3 Aqueous solution, then add ammonia water dropwise to the solution and stir vigorously until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to obtain ZrO 2 -Y 2 o 3 colloidal solution. Thereafter, add 3% polyvinyl alcohol to the colloidal solution, heat it in a water bath at 80° C. for 1 h to fully dissolve it, and then add 50% ZrO to the colloidal solution. 2 -6%Y 2 O Nanopowder and micropowder, of which 70% are nanopowder, 30% are micropowder and the particle diameter is 10μm, and the mixed solution can be milled for 4-6h with a high-energy ball mill to obtain ZrO 2 -Y 2 o 3 Sol-gel+ZrO 2 -6%Y 2 O powder mixture. Inject this mixture into figure 2 Tube neutralization of the device image 3 in the sample compartment of the device. Gradually adjust the speed of centrifuge b...

Embodiment 3

[0021] Example 3: ZrO 2 -Y 2 o 3 Composite ceramic coating with aluminum silicate fibers

[0022] Add 10% aluminum silicate fibers to the mixed solution in Example 2, and use the same steps to obtain ZrO that is uniform and dense, and has a thickness of 120 μm. 2 -Y 2 o 3 Nano-micron ceramic coating compounded with aluminum silicate fibers.

technical field

[0001] The invention relates to the preparation of nanocomposite ceramic materials, in particular to the fields of material surface technology and supergravity field technology. Background technique

[0002] The sol-gel method is an important way to prepare ceramic thin films. The preparation of ceramic thin films by the sol-gel method has many advantages, such as low sintering temperature, nanostructure, uniform mixing of multi-components, easy control of components, uniform film formation, large-area thin films, low cost, and short cycle. Easy industrial production, etc. At present, various ceramic thin films have been successfully prepared by the sol-gel method, including ceramic thin films that improve the corrosion resistance of metals, and functional ceramic thin films such as superconductivity, ferroelectricity, catalysis, and separation. However, the sol-gel method can only prepare ceramic thin films, and the thickness is generally less than 0.5 μm....

Examples

Embodiment 1

[0017] Example 1: Al 2 o 3 -Y 2 o 3 Nano-micron composite ceramic coating

[0018] Prepare 0.1mol / L Al(NO 3 ) 3 +1wt%Y(NO 3 ) 3 Aqueous solution, and then add ammonia water dropwise to the solution and vigorously stir until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to obtain Al 2 o 3 -Y 2 o 3 colloidal solution. Thereafter, add 3% polyvinyl alcohol to the colloidal solution, heat it in a water bath at 80°C for 1 hour to fully dissolve it, and then add 50% Al to the colloidal solution. 2 o 3 Nano-powder and micro-powder, wherein nano-powder accounts for 70%, among 30% of micro-powder, 70% has a particle size of 10 μm, and 30% has a particle size of 74 μm. Use a high-energy ball mill to ball-mill the mixed solution for 4-6 hours. Al can be obtained 2 o 3 -Y 2 o 3 Sol-gel+Al 2 o 3 powder mixture. Inject this mixture into figure 2 Tube neutralization of the device image 3 in the sample com...

Embodiment 2

[0019] Example 2: ZrO 2 -Y 2 o 3 Nano-micron composite ceramic coating

[0020] Prepare 0.1mol / L Zr(NO 3 ) 4 +8wt%Y(NO 3 ) 3 Aqueous solution, then add ammonia water dropwise to the solution and stir vigorously until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to obtain ZrO 2 -Y 2 o 3 colloidal solution. Thereafter, add 3% polyvinyl alcohol to the colloidal solution, heat it in a water bath at 80° C. for 1 h to fully dissolve it, and then add 50% ZrO to the colloidal solution. 2 -6%Y 2 O Nanopowder and micropowder, of which 70% are nanopowder, 30% are micropowder and the particle diameter is 10μm, and the mixed solution can be milled for 4-6h with a high-energy ball mill to obtain ZrO 2 -Y 2 o 3 Sol-gel+ZrO 2 -6%Y 2 O powder mixture. Inject this mixture into figure 2 Tube neutralization of the device image 3 in the sample compartment of the device. Gradually adjust the speed of centrifuge b...

Embodiment 3

[0021] Example 3: ZrO 2 -Y 2 o 3 Composite ceramic coating with aluminum silicate fibers

[0022] Add 10% aluminum silicate fibers to the mixed solution in Example 2, and use the same steps to obtain ZrO that is uniform and dense, and has a thickness of 120 μm. 2 -Y 2 o 3 Nano-micron ceramic coating compounded with aluminum silicate fibers.

Images