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Large-size AlON transparent ceramic preparation method

A technology of transparent ceramics and large size, applied in the field of preparation of large size AlON transparent ceramics, can solve the problems that it is not easy to prepare large size AlON transparent ceramics, the time required for ultrafine particle size is long, and it is difficult to meet industrialization requirements. Improved refinement efficiency, short refinement processing time, and efficient preparation

Inactive Publication Date: 2017-03-08
常熟佳合高级陶瓷材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The planetary ball mill usually has less powder to process at one time, or it takes a long time to achieve the required ultrafine particle size, usually more than 20h. Therefore, this method is not easy to be used to prepare large-size AlON transparent ceramics, or to prepare The efficiency is very low and it is difficult to meet the requirements of industrialization

Method used

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  • Large-size AlON transparent ceramic preparation method
  • Large-size AlON transparent ceramic preparation method
  • Large-size AlON transparent ceramic preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using high-purity self-made AlON powder as raw material, adding 0.25wt% Y 2 o 3 As a sintering aid, the two mixed powders were added with absolute ethanol to form a slurry with a solid content of 50% and stirred evenly. The resulting slurry was put into a sand mill for sand grinding for 5 hours, and dried. 200-mesh sieve, carbon removal at 600°C, holding time 4h, such as figure 1 As shown, the average particle size of the obtained powder after sand milling is <1 μm;

[0021] Press the obtained carbon-removing powder body on a hydraulic press at a pressure of 10 MPa to form a Φ5cm*5mm disc, and then further increase the density of the green body on a cold isostatic press at a pressure of 200 MPa;

[0022] Place the obtained green body in a high-purity graphite crucible, fill it with high-purity AlON powder, and sinter it in a high-temperature graphite furnace at 1930°C for 6 hours under a high-purity nitrogen atmosphere to obtain a high-density AlON ceramic sintered b...

Embodiment 2

[0025] Using high-purity self-made AlON powder as raw material, adding 0.25wt% Y 2 o 3 As a sintering aid, use absolute ethanol to make the mixed powder into a slurry with a solid content of 40% and stir evenly. The resulting slurry is put into a sand mill for sanding for 8 hours, dried, and the dried powder passes through 200 Mesh sieve, remove carbon at 600°C, holding time is 6h, such as figure 2 As shown, the average particle size of the obtained powder after sand milling is <1 μm;

[0026] Press the obtained carbon-removing powder at a pressure of 10 MPa to form a disc with a thickness of Φ10 cm and a thickness of 1 cm, and then perform cold isostatic pressing at a pressure of 200 MPa;

[0027] The obtained green body was placed in a high-purity graphite crucible, buried and fired with high-purity AlON powder, the sintering temperature was 1930 ° C, and the holding time was 8 hours to obtain a high-density AlON ceramic sintered body;

[0028] The obtained ceramic sinte...

Embodiment 3

[0030] Using high-purity self-made AlON powder as raw material, adding 0.35wt% Y 2 o 3 As a sintering aid, use absolute ethanol to make a slurry with a solid content of 45% and stir evenly, then put it into a sand mill for sanding for 10 hours, and dry it. The dried powder is passed through a 200-mesh sieve. In addition to carbon, the holding time is 10h, such as image 3 As shown, the average particle size of the obtained powder is below 1 μm;

[0031] Press the obtained carbon-removing powder body on a hydraulic press with a pressure of 30 MPa to form a disc with a thickness of Φ20 cm and a thickness of 2 cm, and then further increase the density of the green body on a cold isostatic press with a pressure of 250 MPa;

[0032] Place the obtained green body in a high-purity graphite crucible, bury and sinter it with high-purity AlON powder, and sinter at 1940°C for 10 hours under a high-purity nitrogen atmosphere to obtain a high-density AlON ceramic sintered body;

[0033]...

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Abstract

The invention discloses a large-size AlON transparent ceramic preparation method, wherein AlON powder is subjected to fine grinding treatment by using a sand mill, such that the characteristics of one time treatment of a large amount of AlON powder, short sanding time, high efficiency and small powder particle size are provided. In addition, the sanded AlON powder has good molding and sintering property, any binders are not required to be added during pressing molding, and the sanded AlON powder added with the sintering aid can be used for preparing the large-size AlON transparent ceramic through the pressure-free sintering. According to the present invention, the method has advantages of high preparation efficiency, simple operation, low cost, and easy industrialization achieving.

Description

technical field [0001] The invention belongs to the technical field of preparation of transparent ceramics, and in particular relates to a preparation method which can be used for preparing large-size AlON transparent ceramics. Background technique [0002] AlON is Al 2 o 3 The solid solution with AlN has a cubic spinel structure, has good mechanical properties, and has high hardness and melting point. Its optically isotropic nature makes it an excellent choice for preparing transparent ceramics. AlON has a wide range of light transmission, from the near ultraviolet to the mid-infrared region, and has a high transmittance. Its light transmission band is 0.2-6 μm, and the highest transmittance between 0.3-3 μm is as high as 80%. Many properties of AlON can be compared with single crystal sapphire, and the production process of single crystal sapphire is expensive, and it is difficult to prepare crystals of large size or complex shape. Compared with it, AlON ceramics have o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/63
Inventor 张福军刘冬梅
Owner 常熟佳合高级陶瓷材料有限公司
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