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Method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic

A technology of yttrium aluminum garnet and transparent ceramics, which is applied in the field of preparation of rare earth-doped yttrium aluminum garnet transparent ceramics, which can solve the problems of serious powder agglomeration, unfavorable molding, and poor powder fluidity, and achieve high linear transmittance , good mechanical properties

Active Publication Date: 2014-05-14
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape of the powder after direct drying is irregular, and the powder agglomeration is serious, and the powder fluidity is poor, which is not conducive to molding

Method used

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  • Method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic
  • Method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic
  • Method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 5.098g of α-Al2O3 powder, 6.7066g of Y2O3 powder, 0.1010g of Nd2O3, 0.0600g of TEOS and 0.3600g of PVB into a high-purity agate ball mill jar, add 72g of high-purity agate balls, anhydrous Ethanol 6g, then ball milled for 20h. After ball milling, the slurry was spray-dried, the inlet temperature was 110° C., the spray gas flow rate was 400 Nor mlitre / h, and the feed rate was 6 ml / min. Axial one-way pressurization with a pressure of 10Mpa, pressed into a disc of Φ15, and then cold isostatic pressing under a pressure of 200Mpa. The degreased green body was sintered in a vacuum furnace, the heating rate of the furnace was 10°C / min, the final sintering temperature was 1835°C, and the sintering time was 15h. Finally, the ceramics were ground and polished to a thickness of 1.50 mm with a surface grinder and diamond paste. The photo of the polished 1at%Nd:YAG ceramic 1.50mm piece is shown in figure 2 , and its transmittance curve is shown in image 3 . At the laser w...

Embodiment 2

[0029] Put 5.098g of α-Al2O3 powder, 6.7066g of Y2O3 powder, 0.1010g of Nd2O3, 0.0600g of TEOS, 0.3600g of PVB and 0.0060g of castor oil into a high-purity agate ball mill jar, other processes and implementation Example 1 is the same. The degreased green body was sintered in a vacuum furnace with a heating rate of 10°C / min, pre-sintering at 1500°C for 5 hours, final sintering temperature of 1820°C, and sintering time of 10 hours. Finally, the ceramics were ground and polished to 1.00 mm thickness with a surface grinder and diamond paste. The linear transmittance of the sample at the laser wavelength (1064nm) is 83%.

Embodiment 3

[0031] Put 5.098g of α-Al2O3 powder, 6.7066g of Y2O3 powder, 0.1010g of Nd2O3, 0.0600g of TEOS, 0.3000g of PVB and 0.0060g of castor oil into a high-purity agate ball mill jar, other processes and implementation Example 1 is the same. The degreased green body was sintered in a vacuum furnace. The heating rate of the furnace was 10°C / min, the final sintering temperature was 1830°C, and the sintering time was 40h. Finally, the ceramics were ground and polished to a thickness of 3.00 mm with a surface grinder and diamond paste. The linear transmittance of the sample at the laser wavelength (1064nm) is 81%.

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Abstract

The invention relates to a method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic. In the invention, high-transparency polycrystalline ceramic is prepared by using commercial powdered Y2O3, Al2O3 and Re2O3, of which the purities are over 99.9 percent, as main raw materials and by spray granulation dry pressing molding process and vacuum reaction and sintering, wherein the Re may be one or several of trivalent rare earth elements such as Nd<3+>, Yb<3+>, Cr<3+>, Er<3+>, Ce<3+>, Sm<3+> and Eu<3+>; MgO or CaO or tetraethyl orthosilicate (TEOS) or SiO2 is used as a sintering assistant; a certain amount of bonding agent, plasticizer and dispersant is added; the oxides, sintering assistant and additive are mixed and added into a liquid medium, and the mixture is ball-milled and mixed for 0.5 to 100 hours; after the powder materials are mixed uniformly, the powder is made into spherical or approximately spherical grains; blanks formed by drying pressing isostatic forming are degreased; sintering the blanks in a vacuum sintering furnace; and annealing after sintering. The transmissivity at a laser wavelength of the rare earth-doped yttrium aluminum garnet transparent ceramic prepared by the method is more than or equal to 77 percent.

Description

technical field [0001] The invention relates to a preparation method of rare earth doped yttrium aluminum garnet transparent ceramics. Background technique [0002] The optoelectronic industry is an important pillar industry in the 21st century, and laser technology is the core component of optoelectronic technology. As the main body of solid-state lasers, laser materials are an important pillar of solid-state laser technology. At present, the YAG laser materials on the market are usually single crystals. Due to their long growth cycle, high price, small size and low doping concentration, their performance and application range are limited. As we all know, the preparation of YAG transparent ceramics can make up for the shortcomings in the preparation of YAG single crystals, and has optical properties comparable to single crystals. It is a more competitive laser host material to replace single crystals. YAG ceramics also have excellent high-temperature mechanical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/505
Inventor 曹永革黄秋凤郭旺刘媛黄志
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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