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Method for preparing ceramic coating on surface of porous ceramic matrix by slurry spraying

A technology for porous ceramics and ceramic coatings, which is applied in the field of preparing ceramic coatings by slurry spraying on the surface of porous ceramic substrates, can solve problems such as inability to apply, and achieve the effects of wide firing temperature range, increased hardness and shortened production cycle.

Inactive Publication Date: 2013-02-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, at present, these technologies have obvious shortcomings and cannot be applied in actual production.

Method used

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  • Method for preparing ceramic coating on surface of porous ceramic matrix by slurry spraying
  • Method for preparing ceramic coating on surface of porous ceramic matrix by slurry spraying
  • Method for preparing ceramic coating on surface of porous ceramic matrix by slurry spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] according to figure 1 As shown in the process, this embodiment prepares a ceramic coating on the surface of a porous silicon nitride ceramic substrate, and the specific implementation process is as follows:

[0032] (1) Substrate treatment: select porous Si with a porosity of 55% 3 N 4 For the ceramic substrate, use 400-mesh and 800-mesh sandpaper to grind the surface of the substrate successively until the surface is smooth and flat, then put the ground porous ceramic substrate into distilled water and ultrasonically clean it for 20 minutes. After cleaning twice, put the substrate into an oven and bake it at 80°C dry 10h;

[0033] (2) Slurry preparation: set the mass percentage as Y 2 o 3 : SiO 2 : Al 2 o 3 = 42:33:25 coating raw material powder and absolute ethanol are mixed, and the mass ratio of solid powder: absolute ethanol is 1:2.5. Using silicon nitride balls as grinding balls, the mass ratio of silicon nitride balls and solid coating raw material powder...

Embodiment 2

[0039] according to figure 1 In the flow shown, a ceramic coating is prepared on the surface of a porous silicon nitride ceramic substrate, and the specific implementation process is as follows:

[0040] (1) Substrate treatment: select porous Si with a porosity of 43% 3 N 4 For the ceramic substrate, use 400-mesh and 800-mesh sandpaper to grind the surface of the substrate successively until the surface is smooth and flat, and then put the ground porous ceramic substrate into distilled water for ultrasonic cleaning for 15 minutes. After cleaning twice, put the substrate into an oven and bake it at 70°C. Dry 12h;

[0041] (2) Slurry preparation: set the mass percentage as Y 2 o 3 : SiO 2 :Al 2 o 3 = 50: 33: 17 coating raw material powder mixed with absolute ethanol, solid powder: absolute ethanol mass ratio is 1: 4, with silicon nitride ball as grinding ball, silicon nitride ball and solid coating raw material powder The mass ratio is 3:1, and the slurry is ball milled ...

Embodiment 3

[0047] according to figure 1 In the flow shown, a ceramic coating is prepared on the surface of a porous silicon nitride ceramic substrate, and the specific implementation process is as follows:

[0048] (1) Substrate treatment: select porous Si with a porosity of 55% 3 N 4 For the ceramic substrate, use 400-mesh and 800-mesh sandpaper to grind the surface of the substrate successively until the surface is smooth and flat, then put the ground porous ceramic substrate into distilled water and ultrasonically clean it for 20 minutes. After cleaning twice, put the substrate into an oven and bake it at 80°C Dry 12h;

[0049] (2) Slurry preparation: set the mass percentage as Y 2 o 3 : SiO 2 : Al 2 o 3 : Si 3 N 4 =39:23:23:15 coating raw material powder and absolute ethanol are mixed, solid powder: absolute ethanol mass ratio is 1:3, with silicon nitride ball as grinding ball, silicon nitride ball and solid coating raw material The mass ratio of the powder is 3:1, and the ...

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Abstract

The invention discloses a method for preparing a ceramic coating on the surface of a porous ceramic matrix by slurry spraying. The method comprises the processes of matrix treatment, slurry preparation, spraying, drying, and sintering. The uniform coating samples can be obtained in batch by spraying slurry by an air atomization spray gun. The obtained coating after being sintered is uniform and compact, has good combination with the porous ceramic matrix, and has clear interface. The coating does not infiltrate to the porous matrix severely. The coating can significantly decrease water absorption of the porous ceramic matrix, increases surface hardness, and reduces erosion rate of the matrix. Compared with a conventional method, the method has the advantages of simple process, high production efficiency, low cost and the like, and is easy for large-scale production and industrialized application.

Description

technical field [0001] The invention belongs to the technical field of ceramic coating preparation, and in particular relates to a method for preparing a ceramic coating by slurry spraying on the surface of a porous ceramic substrate. Background technique [0002] Due to its low density, high temperature resistance, thermal shock resistance, and low thermal expansion coefficient, porous ceramics are good high-temperature heat insulation materials and structural materials. However, during use, convective heat transfer is easily formed inside the vent hole and the porous structure is easy to absorb water vapor, which seriously affects the performance of the component; in addition, the porous structure also reduces the surface strength of the substrate and easily initiates microcracks, which greatly reduces the performance of porous ceramic components. strength and erosion resistance. [0003] In view of this problem, the current domestic and foreign solutions mainly include s...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 王红洁刘银超王超乔冠军史忠旗
Owner XI AN JIAOTONG UNIV
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