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Sintering preparation method of semi-transparent alumina ceramic

A kind of alumina ceramics, translucent technology, applied in the field of ceramic sintering, can solve the problems of complicated process, production environment pollution, long premixing time, etc., and achieve the effect of excellent comprehensive performance, easy promotion and application, and simple overall process

Inactive Publication Date: 2019-08-30
阜阳创启工艺品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These traditional process methods are complex, long premixing time and need to add organic materials such as colloid or granulation liquid during premixing, and degumming or degreasing after molding, but they cannot guarantee the degumming or degreasing completely. It is the main gas source of air bubbles in alumina ceramics
In the traditional process, the amount of granulation liquid or colloid used is between 5% and 10% of the weight of alumina, although these granulation liquid or colloid can be reused about 5 times, but these substances have harmful effects on the production environment. At the same time, because the colloid or granulation liquid in the body cannot be completely removed, the remaining part of the colloid or granulation liquid during high-temperature sintering will not only generate carbon dioxide or water vapor, but also some carbon black will affect alumina ceramics. light transmittance
[0006] Different improvements have been made to this prior art. For example, the application number is: CN201210189159.3 discloses a method for preparing alumina ceramics by impregnating green bodies. In order to achieve the introduction of inhibitors, the above-mentioned adverse phenomena are improved, but the bubbles cannot be better discharged during the sintering process, resulting in a large room for improvement in the mechanical and optical properties of the material.

Method used

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  • Sintering preparation method of semi-transparent alumina ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing translucent alumina ceramics by sintering, comprising the steps of:

[0027] (1) Mix alumina powder and aluminum nitride powder, and then die-cast to obtain a ceramic body for use;

[0028] (2) Put the ceramic green body prepared in step (1) into a microwave sintering furnace for pre-sintering treatment, control the sintering temperature to 750°C, and control the duration to 2 hours, and take out the pre-sintered ceramic green body after completion;

[0029] (3) Put the pre-sintered ceramic green body prepared in step (2) into the variable temperature box for cooling treatment, take it out after the temperature drops to 50°C, and then immediately immerse it in the inhibitor solution for infiltration treatment, control the immersion The duration of the infiltration treatment is 4 hours, and after completion, the infiltrated ceramic body is taken out for subsequent use;

[0030] (4) Put the impregnated ceramic body prepared in step (3) into a const...

Embodiment 2

[0040] A method for preparing translucent alumina ceramics by sintering, comprising the steps of:

[0041] (1) Mix alumina powder and aluminum nitride powder, and then die-cast to obtain a ceramic body for use;

[0042] (2) Put the ceramic green body prepared in step (1) into a microwave sintering furnace for pre-sintering treatment, control the sintering temperature to 770°C, and control the duration to 3 hours, and take out the pre-sintered ceramic green body after completion;

[0043] (3) Put the pre-sintered ceramic green body prepared in step (2) into the variable temperature box for cooling treatment, take it out after the temperature drops to 55°C, and then immediately immerse it in the inhibitor solution for infiltration treatment, control the immersion The duration of the infiltration treatment is 6 hours, and after completion, the infiltrated ceramic body is taken out for subsequent use;

[0044] (4) Put the impregnated ceramic body prepared in step (3) into a const...

Embodiment 3

[0054] A method for preparing translucent alumina ceramics by sintering, comprising the steps of:

[0055] (1) Mix alumina powder and aluminum nitride powder, and then die-cast to obtain a ceramic body for use;

[0056] (2) Put the ceramic green body prepared in step (1) into a microwave sintering furnace for pre-sintering treatment, control the sintering temperature to 780°C, and control the duration to 4 hours, and take out the pre-sintered ceramic green body after completion;

[0057] (3) Put the pre-sintered ceramic green body prepared in step (2) into the variable temperature box for cooling treatment, take it out after the temperature drops to 60°C, and then immediately immerse it in the inhibitor solution for infiltration treatment, control the immersion The duration of the infiltration treatment is 7 hours, and after completion, the infiltrated ceramic body is taken out for subsequent use;

[0058] (4) Put the impregnated ceramic body prepared in step (3) into a const...

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PUM

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Abstract

The invention discloses a sintering preparation method of semi-transparent alumina ceramic. The method comprises the following steps: (1) carrying out die-cast formation, (2) carrying out pre-sintering treatment, (3) preparing an infiltration ceramic blank, (4) carrying out drying treatment, and (5) carrying out sintering treatment. The preparation method disclosed by the invention is simple in overall process, the steps are matched reasonably, promotion and application are facilitated, and the prepared semi-transparent alumina ceramic is good in mechanical property and optical property, excellent in comprehensive performance and high in market competitiveness.

Description

technical field [0001] The invention relates to the technical field of ceramic sintering, in particular to a method for preparing translucent alumina ceramics by sintering. Background technique [0002] Alumina ceramics refer to ceramics with certain light transmittance prepared by using alumina as the base material and using ceramic manufacturing technology. Alumina ceramics not only have the characteristics of high temperature resistance, corrosion resistance, high insulation and high strength of ceramics, but also have the optical properties of glass and many other incomparable advantages such as low electrical conductivity, so alumina ceramics are gradually being used in Special instrument manufacturing, lighting technology, wireless electronic technology, optics and high temperature technology are increasingly widely used. [0003] The difference in birefringence of alumina crystals is small. The biggest feature of alumina ceramics is transparency and good permeability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/622C04B35/64C04B2235/3865C04B2235/667
Inventor 余国海
Owner 阜阳创启工艺品有限公司
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