Method for preparing ceramic coating on surface of porous ceramic substrate

A technology for porous ceramics and ceramic coatings, which is applied in the field of preparing ceramic coatings on the surface of porous ceramic substrates, and can solve the problems of low deposition efficiency, difficult industrial application of ceramic coatings on porous ceramic surfaces, and cumbersome process

Inactive Publication Date: 2012-06-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the CVD method is used to prepare coatings, the deposition efficiency is low, the cost is high, and it is difficult to deposit on the surface of the substrate with complex shapes; the sol-gel method is mainly to prepare oxide ceramic coatings on the surface of porous ceram

Method used

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  • Method for preparing ceramic coating on surface of porous ceramic substrate
  • Method for preparing ceramic coating on surface of porous ceramic substrate
  • Method for preparing ceramic coating on surface of porous ceramic substrate

Examples

Experimental program
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Embodiment 1

[0021] Such as figure 1 As shown, a method for preparing a ceramic coating on the surface of a porous ceramic substrate in this embodiment comprises the following steps:

[0022] Step 1: First select the phase composition as β-Si 3 N 4 , with a porosity of 57%, a water absorption rate of 40.1%, and a microhardness of 464.52HV, sintered porous silicon nitride was used as the substrate, and then sandpaper with mesh numbers of 400 mesh, 800 mesh, and 1000 mesh was selected to fine-tune the porous ceramic substrate successively. grind;

[0023] Step 2: Put the finely ground porous silicon nitride substrate into absolute ethanol for ultrasonic cleaning for 30 minutes;

[0024] Step 3: put the cleaned porous ceramic substrate into an oven for 15 hours and dry at 70°C;

[0025] Step 4: Select α-Al with a particle size of 15-45 μm 2 o 3 The powder is used as the raw material for spraying, and the supersonic plasma spraying method is used to prepare Al on the surface of the porou...

Embodiment 2

[0028] Such as figure 1 As shown, a method for preparing a ceramic coating on the surface of a porous ceramic substrate in this embodiment comprises the following steps:

[0029] Step 1: First select the phase composition as β-Si 3 N 4 , with a porosity of 57%, a water absorption rate of 40.1%, and a microhardness of 464.52HV, sintered porous silicon nitride was used as the substrate, and then sandpaper with mesh numbers of 400 mesh, 800 mesh, and 1000 mesh was selected to fine-tune the porous ceramic substrate successively. grind;

[0030] Step 2: Put the finely ground porous silicon nitride substrate into absolute ethanol for ultrasonic cleaning for 30 minutes;

[0031] Step 3: put the cleaned porous ceramic substrate into an oven for 15 hours and dry at 70°C;

[0032] Step 4: Select α-Al with a particle size of 15-45 μm 2 o 3 The powder is used as the raw material for spraying, and the supersonic plasma spraying method is used to prepare Al on the surface of the porou...

Embodiment 3

[0035] Such as figure 1 As shown, a method for preparing a ceramic coating on the surface of a porous ceramic substrate in this embodiment comprises the following steps:

[0036] Step 1: First select the phase composition as β-Si 3 N 4 , with a porosity of 40%, a water absorption rate of 25.4%, and a microhardness of 876.16HV, the sintered porous silicon nitride is used as the substrate, and then sandpaper with a mesh number of 400 mesh, 800 mesh, and 1000 mesh is used to fine-tune the porous ceramic substrate successively. grind;

[0037] Step 2: Put the finely ground porous silicon nitride substrate into absolute ethanol for ultrasonic cleaning for 20 minutes;

[0038]Step 3: put the cleaned porous ceramic substrate into an oven for 10 hours and dry at 70°C;

[0039] Step 4: Select α-Al with a particle size of 15-45 μm 2 o 3 The powder is used as the raw material for spraying, and the supersonic plasma spraying method is used to prepare Al on the surface of the porous ...

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Abstract

The invention discloses a method for preparing a ceramic coating on the surface of a porous ceramic substrate, which includes: firstly, selecting a porous ceramic substrate and fine grinding; secondly, ultrasonically cleaning the porous ceramic substrate after fine grinding; thirdly, drying the cleaned porous ceramic substrate; and fourthly, selecting spraying materials for supersonic plasma spraying. The method can be used for preparing ceramic coatings on the surfaces of porous ceramic substrates, particles in the coating can be effectively and completely pinned in the substrate, the coatings and the substrates are firm in bonding, and preparation of a bottom layer or a transitional layer is not needed. Further, the method has the advantages of simplicity, flexibility, high efficiency and easiness in industrial application.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of ceramic coatings, and in particular relates to a method for preparing ceramic coatings on the surface of a porous ceramic substrate. Background technique [0002] Porous ceramics can be regarded as a composite of ceramics and pores, which combines the advantages of ceramic materials and porous structures. It has the characteristics of low density, high temperature resistance, corrosion resistance, thermal shock resistance, small thermal expansion coefficient, and easy processing. Therefore, it can be used as a thermal insulation material. materials, structural materials, etc. However, because the surface and interior are porous structures and the pores are connected, the thermal conductivity of porous ceramics will increase; in addition, the surface of the porous substrate is rough and there are a large number of microcracks, which greatly reduces the strength and impact resistance ...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 王红洁王超陈纪伟乔冠军杨建锋
Owner XI AN JIAOTONG UNIV
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