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Method for preparing compact O'-sialon/alpha-Si3N4 composite ceramic coating on surface of porous nitride ceramic base body

A nitride ceramic, -si3n4 technology is applied in the field of preparation of ceramic coatings, which can solve the problems of delamination and coating cracking, and achieve the effects of high efficiency, shortened production cycle, and improved erosion resistance and oxidation resistance.

Inactive Publication Date: 2014-03-26
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a dense O'-sialon / α-Si prepared on the surface of a porous nitride ceramic substrate 3 N 4 The method of multiphase ceramic coating can solve the problems of coating cracking and delamination in the prior art. This method can prepare Si on the surface of a nitride ceramic substrate with a high porosity and a complex shape. 3 N 4 / sialon composite ceramic coating, and control the O’-sialon phase content in the coating by controlling the number of spraying times and sintering temperature; this method has the characteristics of simplicity, flexibility, high efficiency and easy industrial application

Method used

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  • Method for preparing compact O'-sialon/alpha-Si3N4 composite ceramic coating on surface of porous nitride ceramic base body
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  • Method for preparing compact O'-sialon/alpha-Si3N4 composite ceramic coating on surface of porous nitride ceramic base body

Examples

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Embodiment 1

[0030] This example is to prepare dense O'-sialon / α-Si on the surface of porous silicon nitride ceramic substrate with high porosity 3 N 4 Multiphase ceramic coating, comprising the following steps:

[0031] Step 1, substrate treatment: select a porous silicon nitride ceramic substrate with a porosity of 62%, use 400 mesh, 800 mesh, and 1000 mesh sandpaper to grind successively until the surface of the substrate is smooth and flat, and then put the porous silicon nitride ceramic substrate after grinding. Ultrasonic cleaning in distilled water for 25 minutes, after cleaning twice, put the substrate into an oven and dry at 70°C for 8 hours;

[0032] Step 2, preparation of yttrium aluminum silicon ceramic powder: Y 2 o 3 , SiO 2 、Al 2 o 3 The mixture is mixed with absolute ethanol, and its solid content is 20%, wherein Y 2 o 3 , SiO 2 、Al 2 o 3 In the oxide raw material powder, the mass percentage is Y 2 o 3 :SiO2 2 :Al 2 o 3 =34.04:45.32:20.64, with silicon nitri...

Embodiment 2

[0039] This example is to prepare dense O'-sialon / α-Si on the surface of porous silicon nitride ceramic substrate with low porosity 3 N 4 Multiphase ceramic coating, comprising the following steps:

[0040] Step 1, substrate treatment: select a porous silicon nitride ceramic substrate with a porosity of 34%, use 400 mesh, 800 mesh, and 1000 mesh sandpaper to grind successively until the surface of the substrate is smooth and flat, and then put the porous silicon nitride ceramic substrate after grinding. Ultrasonic cleaning in distilled water for 15 minutes, after cleaning twice, put the substrate into an oven, and dry at 80°C for 15 hours;

[0041] Step 2, preparation of yttrium aluminum silicon ceramic powder: Y 2 o 3 , SiO 2 、Al 2 o 3 The mixture is mixed with absolute ethanol, and its solid content is 20%, wherein Y 2 o 3 , SiO 2 、Al 2 o 3 In the oxide raw material powder, the mass percentage is Y 2 o 3 :SiO2 2 :Al 2 o 3 =34.04:45.32:20.64, with silicon nitr...

Embodiment 3

[0048] This example is to prepare dense O'-sialon / α-Si on the surface of porous sialon ceramic substrate 3 N 4 Multiphase ceramic coating, comprising the following steps:

[0049] Step 1, substrate treatment: select a porous sialon ceramic substrate with a porosity of 45%, use 400 mesh, 800 mesh, and 1000 mesh sandpaper to grind successively until the surface of the substrate is smooth and flat, and then put the ground porous sialon ceramic substrate into distilled water for ultrasonic Wash for 20 minutes, after washing twice, put the substrate into the oven, and dry at 80°C for 12 hours;

[0050] Step 2, preparation of yttrium aluminum silicon ceramic powder: Y 2 o 3 , SiO 2 、Al 2 o 3 The mixture is mixed with absolute ethanol, and its solid content is 20%, wherein Y 2 o 3 , SiO 2 、Al 2 o 3 In the oxide raw material powder, the mass percentage is Y 2 o 3 :SiO2 2 :Al 2 o 3 =34.04:45.32:20.64, with silicon nitride balls as grinding balls, silicon nitride balls a...

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Abstract

A method for preparing a compact O'-sialon / alpha-Si3N4 composite ceramic coating on the surface of a porous nitride ceramic base body comprises the following steps: 1, treatment of the base body; 2, preparation of yttrium-containing aluminum silicon ceramic powder; 3, preparation of slurry; 4, spraying of the slurry; 5, drying of a sample; 6, sintering of the sample. The O'-sialon / alpha-Si3N4 composite ceramic coating prepared according to the method is uniform and controllable in thickness, and compact in structure, and has no microscopic crack. According to the method, the O'-sialon / alpha-Si3N4 composite ceramic coating can be prepared on the surface of the ceramic base body which is high in air porosity and complex in shape, and the content of O'-sialon in the coating can be controlled by controlling the spraying times and the sintering temperature. The method is simple, flexible and effective, and easy for industrial application.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic coatings, and in particular relates to the preparation of dense O'-sialon / α-Si on the surface of a porous nitride ceramic substrate 3 N 4 Method for multiphase ceramic coatings. Background technique [0002] Porous nitride ceramics can be regarded as a composite of nitride ceramics and pores, which combines the advantages of nitride ceramic materials and porous structures, and has the characteristics of low density, high temperature resistance, corrosion resistance, thermal shock resistance, small thermal expansion coefficient, and easy processing. , is a good structure-function integration material, which can be used as heat insulation material, wave-transmitting material, etc. However, because its surface and interior are porous structures, and the pores are connected. During use, it is easy to absorb moisture in the air, which will increase the thermal conductivity of porous n...

Claims

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Application Information

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IPC IPC(8): C04B41/87
Inventor 王红洁王超范星宇牛敏史忠旗王继平
Owner XI AN JIAOTONG UNIV
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