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Preparation method for low-brittleness polycrystalline semitransparent aluminum oxide ceramic

A low-brittleness technology for alumina ceramics, applied in the field of preparation of low-brittleness polycrystalline translucent alumina ceramics, can solve problems such as increased brittleness, and achieve the effects of reduced brittleness, orderly grain arrangement, and remarkable grain arrangement

Pending Publication Date: 2020-06-19
宁波南海泰格尔陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing low-brittle polycrystalline translucent alumina ceramics, so as to solve the problem of increased brittleness caused by the disordered arrangement of grains of alumina ceramics in the prior art

Method used

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preparation example Construction

[0021] The application provides a method for preparing low-brittle polycrystalline translucent alumina ceramics, comprising the following steps:

[0022] According to the composition of the designed alumina ceramics, the composition of all pre-reduced alumina ceramics can adopt the technical solution of the application, especially when using high-content alumina, in the technical solution of the application, the optimal The technology is that the content of alumina is higher than 99%, and also includes other components, such as zirconia or germania.

[0023] High-pressure die-casting is used to prepare alumina ceramic blanks. High-pressure die-casting is a conventional technology in the field of alumina ceramic production technology. The high-pressure die-casting of the present application also adopts conventional technology. The pressure of high-pressure die-casting is 350MPa-550MPa, preferably 450MPa-500MPa .

[0024] The surface of the alumina ceramic body is doped with yt...

Embodiment 1

[0029] A method for preparing low-brittle polycrystalline translucent alumina ceramics, comprising the following steps:

[0030] Select 99% alumina and 1% zirconia, and use 450MPa high-pressure die-casting to prepare the alumina ceramic body; vacuum sputter yttrium oxide on the surface of the alumina ceramic body, dope the alumina ceramic, and sputter Energy 80kev.

[0031] The surface-doped alumina ceramic green body is pre-sintered in a hydrogen atmosphere, the pre-sintering temperature is 1250°C, and the holding time is 2 hours.

[0032] When the temperature of the pre-sintered alumina ceramic body is lowered to 60°C, it is immersed in a saturated calcium oxide aqueous solution for constant temperature impregnation at 60°C for 3 hours, and then dried at room temperature.

[0033] The dried alumina ceramic green body is placed in a sintering furnace for sintering, the sintering temperature is 1700° C., and the holding time is 3 hours to obtain alumina ceramics with oriented...

Embodiment 2

[0035] A method for preparing low-brittle polycrystalline translucent alumina ceramics, comprising the following steps:

[0036] Select 99.9% alumina and 0.1% zirconia, and use 500MPa high-pressure die-casting to prepare the alumina ceramic body; vacuum yttrium oxide is sputtered on the surface of the alumina ceramic body by electron beams, doped to the alumina ceramics, and sputtered Energy 104kev.

[0037] The surface-doped alumina ceramic body is pre-sintered in a hydrogen atmosphere, the pre-sintering temperature is 1100° C., and the holding time is 2 hours.

[0038] When the temperature of the pre-sintered alumina ceramic body is lowered to 60°C, it is immersed in a saturated calcium oxide aqueous solution for constant temperature impregnation at 60°C for 3 hours, and then dried at room temperature.

[0039] The dried alumina ceramic body is placed in a sintering furnace for sintering at a sintering temperature of 1900° C. and a holding time of 3 hours to obtain an alumi...

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Abstract

The invention relates to a preparation method for low-brittleness polycrystalline semitransparent aluminum oxide ceramic. The preparation method comprises the following steps: die-casting aluminum oxide ceramic ingredients into an aluminum oxide ceramic green body by adopting high-pressure die-casting molding; doping yttrium oxide onto the surface of the aluminum oxide ceramic green body through sputtering, then carrying out presintering treatment, cooling a presintered aluminum oxide ceramic green body, then immersing the cooled presintered aluminum oxide ceramic green body into an inhibitingagent for constant-temperature infiltration, then carrying out normal-temperature drying, placing an obtained aluminum oxide ceramic green body into a sintering furnace, and carrying out sintering soas to obtain aluminum oxide ceramic with crystals arranged in an oriented mode. According to the invention, sputtering doping is carried out firstly; the procedures of pre-sintering treatment and immersing in the inhibiting agent are then carried out; high-temperature sintering is then carried out; thus, the prepared aluminum oxide ceramic is significantly ordered in grain arrangement; meanwhile,the brittleness of the aluminum oxide ceramic is also significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of new materials, in particular refers to the technology of alumina ceramics, in particular to a preparation method of low-brittle polycrystalline translucent alumina ceramics. Background technique [0002] Alumina ceramics have the advantages of high temperature strength, good heat resistance, strong corrosion resistance, good electrical insulation and high thermal conductivity, and are widely used in many fields such as lighting, chemical industry, electronics, and medicine. Brittleness limits its application in many fields. [0003] In order to reduce the brittleness of alumina ceramics, after a lot of research, it was found that the main reason is the crystal structure of alumina ceramics, and alumina itself is hexagonal, but the crystal arrangement of alumina ceramics after firing For mixed morphology, resulting in increased brittleness. By improving the crystal arrangement sequence inside alumina cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B41/85C04B41/87
CPCC04B35/10C04B35/622C04B41/009C04B41/5027C04B41/5045C04B41/85C04B41/87C04B2235/3208C04B2235/3225C04B41/4529C04B41/4535
Inventor 吕冠军王彬瑾董威李惠龙林韩邦
Owner 宁波南海泰格尔陶瓷有限公司