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Method for manufacturing transparent alumina ceramic and application thereof

A technology of alumina ceramics and a manufacturing method, which is applied in dental preparations, pharmaceutical formulations, medical science and other directions, can solve the problems of uneven distribution of MgO, reduce the light transmittance of alumina ceramics, etc., and achieve good grain growth and grain growth. inhibiting effect

Inactive Publication Date: 2013-08-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in Al 2 o 3 Introduce MgO in the medium, due to the uneven distribution of MgO, local segregation is caused, and the second phase (MgAl 2 o 4 ), forming a light scattering center, which reduces the light transmittance of alumina ceramics

Method used

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  • Method for manufacturing transparent alumina ceramic and application thereof
  • Method for manufacturing transparent alumina ceramic and application thereof
  • Method for manufacturing transparent alumina ceramic and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using α-Al with an average particle size of 0.35μm and a purity of 99.98% 2 o 3 . 100g alumina powder and 0.09gLa 2 (CO 3 ) 3 ·8H 2 O, 0.22gZr(NO 3 ) 4 Dissolve in ethanol, add 1.5wt% PEG-400 as a dispersant, and ultrasonically vibrate until uniformly dispersed. Then, under the condition of constant magnetic stirring, add ammonia water (0.04mol / L) dropwise at a rate of 2mL / min to form the precipitation of additive ions, strictly control the dropping speed, and finally adjust the pH The value is 8.1, keep the magnetic stirring for 1.5h, so that the precipitation reaction is uniform and sufficient.

[0029] The obtained suspension is filtered, washed (alcohol-washed), dried, and the obtained powder is dry-pressed and isostatic-pressed to form a rough body after granulation. min, the sintering temperature is 1150°C, and the temperature is kept for 2h. Then adopt vacuum sintering, the sintering temperature is 1750 ℃, and the time is 3h. The sintered ceramic sheet...

Embodiment 2

[0032] Using α-Al with an average particle size of 0.4μm and a purity of 99.99% 2 o 3 . 100g alumina powder and 0.18gCe(NO3) 3 ·6H 2 O, 0.09gThCl 4 Dissolve in ethanol, add 0.10wt% isopropanol as a dispersant, and ultrasonically vibrate until uniformly dispersed. Then the homogeneously dispersed suspension was slowly added dropwise with sodium acetate (0.05mol / L) at a rate of 5mL / min under the condition of constant magnetic stirring to form the precipitation of additive ions, and the speed of dropping was strictly controlled, and finally Adjust the pH value to 8.9, and keep magnetic stirring for 2 hours, so that the precipitation reaction in the period is uniform and sufficient.

[0033] The obtained suspension was filtered, washed (alcohol-washed), and dried. The obtained powder was injection molded and thermally degreased for 40 hours to obtain a green body. First, it was pre-sintered by pressureless sintering. The temperature is 1200°C and the temperature is kept for ...

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Abstract

The invention discloses a method for manufacturing transparent alumina ceramic, which belongs to the technical field of high-performance transparent alumina ceramic preparation. In the method, an additive is introduced by adopting a chemical heterogeneous nucleation sedimentation method, so that the additive ions are uniformly coated on the surface of alumina powder by using the alumina powder asa heterogeneous nucleation center to form nano powder with 'shell-nuclear' composite structure; and the obtained nano powder is molded and sintered to prepare the transparent alumina ceramic. The additive is coated on the surface of the alumina powder to form a nano coating, and the additive is finally uniformly dispersed in the alumina matrix on nano scale after sintering so as to achieve the effect of well inhibiting the growth of crystal grains. The method successfully overcomes the defect caused by a wet mixing ball milling method, and finally prepares the transparent alumina ceramic withfiner and more uniform additive microstructure and better light transmission. The linear transmittance of the prepared transparent alumina ceramic is about 35 to 43 percent when the wavelength is 300to 800 nanometers.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance transparent alumina ceramics, and in particular relates to a manufacturing method and application of transparent alumina ceramics. Background technique [0002] The biggest feature of transparent alumina ceramics is that it has good permeability to visible light and infrared light, and has the advantages of high temperature strength, good heat resistance, strong corrosion resistance, good electrical insulation, and high thermal conductivity. Therefore, it can be used as ceramic metal halide lamp tube shell, transparent ceramic armor, high temperature infrared detection window material, crucible for melting special glass and integrated circuit substrate material, etc. [0003] The preparation of transparent alumina ceramics generally requires the addition of a small amount of additives. On the one hand, these additive ions are solid-dissolved in the main crystal phase, rely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622A61K6/06
Inventor 谢志鹏刘伟薄铁柱
Owner TSINGHUA UNIV
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