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Freezing molding method for neodymium doped yttrium aluminum garnet transparent laser ceramic

A laser ceramic, neodymium-doped yttrium-aluminum technology, used in ceramic molding machines, chemical instruments and methods, manufacturing tools, etc., can solve the problems of optical and laser performance decline, ceramic transparency decline, inconsistent sintering shrinkage, etc., to overcome the quality of ceramics problems, avoid hard agglomeration and breakage, avoid the effect of uneven green body

Inactive Publication Date: 2011-05-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this pressure grouting method has complex equipment and cumbersome operating procedures
All grouting molding methods involving porous models involve part of the water removal process from the contact surface between the slurry and the porous abrasive tool. Since the water removal process only occurs at the contact surface, the density of the green body after molding is not uniform, and it is easy to During the sintering process, the molded product will be deformed due to inconsistent sintering shrinkage, and because the density of the part in contact with the plaster mold is high, it is easy to sinter at high temperature, which affects the elimination of pores inside the ceramic, resulting in a decrease in the transparency of the ceramic
At the same time, due to the migration of soluble salts (calcium salts, potassium salts, sodium salts) in the plaster mold to the surface of the mold to form a surface layer, it will lead to changes in the local phase composition of the ceramics and a decrease in optical and laser properties.

Method used

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  • Freezing molding method for neodymium doped yttrium aluminum garnet transparent laser ceramic
  • Freezing molding method for neodymium doped yttrium aluminum garnet transparent laser ceramic
  • Freezing molding method for neodymium doped yttrium aluminum garnet transparent laser ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a method for forming a yttrium aluminum garnet ceramic body doped with neodymium, comprising the steps of:

[0021] (1) Put 20g of Nd:YAG powder into a mixed solution of 10.5ml of water and glycerin, the mass ratio of water to glycerin is 9:1, and the amount of polyacrylic acid dispersant added is the mass of the powder 1.5wt.%, the raw material powder accounted for 65wt% of the total mass of each component (the mixed solution of water and glycerol, the organic dispersant, the sum of the raw material powder addition), let it stand for 24h, and put it into a planetary ball mill for ball milling for 6h;

[0022] (2) After pouring out the ball-milled slurry, ultrasonically vibrate for 5 minutes, and adjust the pH of the slurry to 8 with ammonia water, pour the slurry into a polytetrafluoroethylene mold, freeze at -50°C for 10 hours, and vacuum dry for 24 hours Then go to the mold.

[0023] Step (2) The degree of vacuum in the vacuum drying process is 50Pa. ...

Embodiment 2

[0025] (1) Put 15g of Nd:YAG powder into a mixed solution of 8.2ml of water and glycerin, the mass ratio of water to glycerin is 10.5:1, and the amount of polyacrylic acid dispersant added is the mass of the powder % of 1.4wt.%, the raw material powder accounts for 64wt% of the total mass of each component, let it stand for 24h, and put it into a planetary ball mill for ball milling for 10h;

[0026] (2) After pouring out the ball-milled slurry, ultrasonically vibrate for 5 minutes, and adjust the pH of the slurry to 9 with ammonia water, pour the slurry into a polytetrafluoroethylene mold, freeze at -40°C for 8 hours, and vacuum dry for 30 hours Then go to the mold.

[0027] Step (2) The degree of vacuum in the vacuum drying process is 60Pa.

Embodiment 3

[0029] (1) Put 30g of Nd:YAG powder into a mixed solution of 17.2ml of water and glycerin, the mass ratio of water to glycerin is 12:1, and the amount of polyacrylic acid dispersant added is the mass of the powder 1.3wt.%, the raw material powder accounts for 63wt% of the total mass of each component, let stand for 24h, and put it into a planetary ball mill for ball milling for 10h;

[0030] (2) After pouring out the ball-milled slurry, ultrasonically vibrate for 5 minutes, and adjust the pH of the slurry to 10 with ammonia water, pour the slurry into a polytetrafluoroethylene mold, freeze at -50°C for 12 hours, and vacuum dry for 36 hours Then go to the mold.

[0031] The vacuum degree in the vacuum drying process of the step (2) is 80Pa.

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Abstract

The invention relates to a method for molding a neodymium-doped yttrium aluminum garnet transparent ceramic through refrigeration. The method comprises the following steps: selecting neodymium-doped yttrium aluminum garnet Nd:YAG powder as a raw material; adding the raw material powder and an organic dispersing agent to the mixed solution of water and glycerol; keeping stand, and then performing ball milling and ultrasonic vibration; adjusting the pH value of the slurry to between 8 and 10 with ammonia, and then pouring the slurry into a mold to be frozen for 8 to 12 hours; and performing vacuum drying and removing the mold to prepare a neodymium-doped YAG molded blank. The ceramic blank prepared by the method has high solid content, communication pores, and uniform ceramic blank density,thus the ceramic blank is not easy to deform in the subsequent processes of calcination and processing.

Description

technical field [0001] The invention belongs to the preparation technology of laser ceramic materials, in particular to a freezing forming method of Nd-doped yttrium aluminum garnet transparent laser ceramics. Background technique [0002] Due to the low preparation temperature and low cost of ceramic laser media, large-scale products can be manufactured, high doping concentration can be achieved, time-consuming, and mass production can be achieved, so it has attracted extensive attention from domestic and foreign scientific research workers. The molding process plays a linking role in the entire preparation process of ceramic materials. It is the key to ensure the reliability, yield and repeatability of ceramic materials and components, and is directly related to industrialization and large-scale production. The molding method has a great influence on the quality of the ceramic green body and the microstructure of the sintered body. [0003] At present, the molding methods...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/622B28C1/04B28C1/06B28B1/14
Inventor 刘宏吕耀辉桑元华刘树江张晓林刘铎王继扬
Owner SHANDONG UNIV