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Preparation method of Al2O3-Si3N4 gradient material with beta-Sialon transition layer

An al2o3-si3n4, gradient material technology, applied in chemical instruments and methods, layered products, ceramic layered products, etc., to achieve the effect of uniform gradient distribution and simple and easy preparation process

Inactive Publication Date: 2012-10-10
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is no Al with β-Sialon as the transition layer for connecting metal and ceramic materials 2 o 3 -Si 3 N 4 Reports about preparation of gradient materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh the β-Sialon powder, Al 2 o 3 Powder, Si 3 N 4 Powder and Y 2 o 3 The powder is prepared as a mixed powder of each single layer;

[0019] (2) Grind each single-layer mixed powder obtained in step (1) in an agate mortar for 5 minutes, and then stack the ground powder layer by layer in a mold with an inner diameter of 3.5 cm Form a 20-layer original gradient stack;

[0020] (3) Compressing the original gradient stack formed in step (2) with a pressure of 20 MPa;

[0021] (4) Put the pressed molded body obtained in step (3) in a gas pressure sintering furnace under the conditions of 5MPa nitrogen pressure and 1700°C sintering temperature for 3 hours to obtain the Al with β-Sialon as the transition layer. 2 o 3 -Si 3 N 4 Gradient material; the volume density of the prepared gradient material is 2.932g / cm 3。 . The crack growth test of the material shows that the gradient distribution of the material is uniform, and there is no stress concentration pheno...

Embodiment 2

[0026] (1) Weigh the β-Sialon powder, Al 2 o 3 Powder, Si 3 N 4 Powder and Y 2 o 3 The powder is prepared as a mixed powder of each single layer;

[0027] (2) Grind each single-layer mixed powder obtained in step (1) in an agate mortar for 5 minutes, and then stack the ground powder layer by layer in a mold with an inner diameter of 3.5 cm Form a 14-layer original gradient stack;

[0028] (3) Compressing the original gradient stack formed in step (2) with a pressure of 18 MPa;

[0029] (4) Put the press-formed body obtained in step (3) in a pressure sintering furnace under 5MPa nitrogen pressure and 1650°C sintering temperature for 4 hours to prepare Al with β-Sialon as the transition layer. 2 o 3 -Si 3 N 4 Gradient material; the volume density of the prepared gradient material is 2.90g / cm 3。 . The crack growth test of the material shows that the gradient distribution of the material is uniform, and there is no stress concentration phenomenon between layers. After...

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Abstract

The invention discloses a preparation method of Al2O3-Si3N4 gradient material with a beta-Sialon transition layer. The preparation method includes: using beta-Sialon powder, Al2O3 powder, Si3N4 powder and Y2O3 powder as raw materials to prepare each single layer of mixed powder, grinding each single layer of mixed powder in an agate mortar, stacking the power layer by layer in a mould using powder laminating to form 10-20 layers of original gradient stacks, forming by pressing at a pressure of 15-25MPa, and preserving heat in a pressure sintering furnace for 3-5 hours at a nitrogen pressure of 4-6MPa and a temperature of 1600-1800 DEG C to obtain the Al2O3-Si3N4 gradient material with the beta-Sialon transition layer, wherein purity of the Z=3 beta-Sialon powder is above 97%, the purity of the Al2O3 powder, the Si3N4 powder and the Y2O3 powder is above chemical purity, and the granularity of the Al2O3 powder, the Si3N4 powder and the Y2O3 powder is 800nm-1000nm. The gradient material prepared by the method is even in gradient distribution, and no stress concentration occurs among layers. In addition, the preparation method is simple and practicable in process, and industrial production is facilitated.

Description

technical field [0001] The present invention relates to an Al for joining metal and ceramic materials 2 o 3 -Si 3 N 4 Preparation method of gradient material, especially Al with β-Sialon as transition layer 2 o 3 -Si 3 N 4 Preparation method of gradient material. Background technique [0002] Si 3 N 4 With its excellent high-temperature mechanical properties and good corrosion resistance and wear resistance, ceramics have a very broad application prospect in high-tech fields such as information engineering, aerospace, energy transportation, and weaponry. However, due to its disadvantages such as high brittleness, low ductility, difficult deformation and difficult cutting process, Si 3 N 4 Use is limited in many fields. Si 3 N 4 In order for ceramics to be more widely used, it is often necessary to solve the problem of bonding between them and between them and metals. Si 3 N 4 There are still many problems in the connection with metals that have not been comp...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/599C04B35/584C04B35/10B32B18/00
Inventor 王林江谢襄漓张烨马国斯易文龙
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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