Hot pressing method for preparing ceramic coating

A technology of ceramic coating and hot pressing method, which is applied in the field of preparation of ceramic coating, which can solve the problems of affecting the uniformity of the coating, the displacement of the coating substrate, and the displacement easily occurring on the surface parallel to the direction of the applied force. , to achieve the effects of improving various performances, overcoming friction, and improving the effect of force transmission

Inactive Publication Date: 2011-09-21
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The friction force increases with the increase of pressure, which will eventually lead to the displacement of the coating relative to the substrate, and this displacement tends to occur on the surface parallel to the direction of the force, which will affect the uniformity and stability of the coating. Many properties associated with it

Method used

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  • Hot pressing method for preparing ceramic coating
  • Hot pressing method for preparing ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. Al on the surface of cuboid sample 2 o 3 ceramic coating

[0026] Prepare 1mol / L Al(NO 3 ) 3 Aqueous solution, 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 The colloidal solution is heated to evaporate the water to form a slurry. Coat this slurry on the surface of a cuboid 1Cr18Ni9Ti stainless steel with a size of 15×10×2, and bury it in 800-mesh Al 2 o 3 ·SiO2 2 In ceramic microbeads, apply 20MPa / cm 2 The pressure was kept at 90°C for 60 minutes, then raised to 400°C, held for 180 minutes, and then cooled to room temperature. The surface of the sample obtained a uniform and dense Al layer with a thickness of 20 μm. 2 o 3 Nano ceramic coating.

Embodiment 2

[0027] Example 2. ZrO on the surface of cube sample 2 ceramic coating

[0028] Prepare 1mol / L Zr(NO 3 ) 4 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 The colloidal solution is heated to evaporate the water to form a slurry. Coat this slurry on the surface of a cube 1Cr18Ni9Ti stainless steel with a size of 8×8×8, and bury it in 1250 mesh Al 2 o 3 ·SiO2 2 In ceramic microbeads, apply 20MPa / cm 2 The pressure was kept at 90°C for 60 minutes, then the temperature was raised to 400°C, held for 180 minutes, and then cooled to room temperature. The surface of the sample obtained uniform and dense ZrO with a thickness of 20 μm. 2 Nano ceramic coating.

Embodiment 3

[0029] Example 3. Al on the surface of a cylindrical sample 2 o 3 -Y 2 o 3 ceramic coating

[0030] Prepare an aqueous solution of 1mol / LAl(NO3)3+1wt%Y(NO3)3, 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 stirring with a magnetic stirrer for 2h, then A colloidal solution of Al2O3-Y2O3 can be obtained, and the colloidal solution is heated to evaporate water to form a slurry. Coat this slurry on the surface of a cube 1Cr18Ni9Ti stainless steel with a size of 8×8×8, embed it in 1250-mesh Al2O3??SiO2 ceramic microbeads, apply a pressure of 20MPa / cm2, keep it at 90°C for 60 minutes, and then raise the temperature To 400 ℃, heat preservation for 180 minutes, and then cooled to room temperature, the surface of the sample obtained a uniform and dense Al2O3-Y2O3 nano-ceramic coating with a thickness of 20 μm.

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Abstract

The invention discloses a hot pressing method for preparing ceramic coating. According to the method, a ceramic coating slurry coated sample is embedded into ceramic microspheres for hot pressing solidification to obtain a needed ceramic coating. Ceramic microspheres are used as a solid medium for heat transfer, force transmission and water loss to replace traditional coarse quartz sand to improve force transmission effect during presurrizing process, so that external forces can be transmitted uniformly to each surfaces of the ceramic coating under a certain pressure, besides displacements and frictions can be reduced at most to effectively improve a uniformity of the ceramic coating and to ensure integral uniformity of the ceramic coating. Therefore, performances of the ceramic coating can be enhanced effectively, and preparation quality of ceramic coatings for surfaces of samples with complicated shapes can be increased.

Description

technical field [0001] The invention relates to a method for preparing a ceramic coating, in particular to a method for preparing a ceramic coating by a hot pressing method. Background technique [0002] The sol-gel method is an important way to prepare ceramic thin films. At present, in the process of preparing ceramic coatings by hot pressing forming technology, the substrate with a certain shape coated with ceramic coating slurry is embedded in the powder for hot pressing and solidification. The powder plays the role of heat transfer, force transfer, and moisture loss. etc. Therefore, quartz sand with coarser particle size and better fluidity is often used. However, it was found during the preparation process that since the packing density of the quartz sand will gradually increase with the increase of the applied pressure, the quartz sand close to the coating surface will be displaced from the coating surface during the pressurization process, thereby causing a collisio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/645
Inventor 向嵩张鲲
Owner GUIZHOU UNIV
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