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Method for preparing Nd: YAG transparent ceramic by using magnesium silicate as sintering aid

A technology of sintering aids and transparent ceramics, applied in the field of transparent ceramics preparation, can solve the problems of grain growth and irregularity, and achieve the effect of improving transparency and inhibiting abnormal grain growth.

Active Publication Date: 2014-06-18
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the deficiencies of the prior art and provides a method for using magnesium silicate as a sintering aid to solve the problems of abnormal grain growth and irregular grains in the ceramic sintering process

Method used

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  • Method for preparing Nd: YAG transparent ceramic by using magnesium silicate as sintering aid
  • Method for preparing Nd: YAG transparent ceramic by using magnesium silicate as sintering aid
  • Method for preparing Nd: YAG transparent ceramic by using magnesium silicate as sintering aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 31.68g of Y 2 O 3 , 24.08gAl 2 O 3 , 0.476gNd 2 O 3 , 0.15g of magnesium silicate mass. Add 110g of absolute ethanol, and 300g of alumina grinding balls, mill at 160r / min for 16h, dry and sieve the powder after ball milling, then dry press at 10MPa to form, and then cold isostatically press at 200MPa. The ceramic green body was sintered in vacuum at 1750°C for 10h. The SEM image of the cross-section of the prepared Nd:YAG ceramics is shown in Fig. figure 1 shown.

Embodiment 2

[0028] Weigh 62.74g of Y 2 O 3 , 48.16gAl 2 O 3 , 1.904gNd 2 O 3 , 0.24g of magnesium silicate mass. Add 200g of anhydrous ethanol, and 400g of alumina grinding balls, ball mill at 160r / min for 16h, dry and sieve the powder after ball milling, then dry press at 10MPa to form, and then cold isostatically press at 200MPa. The ceramic green body was sintered in vacuum at 1780°C for 10h. The SEM images of the prepared Nd:YAG ceramics after surface polishing and hot etching are as follows figure 2 shown.

Embodiment 3

[0030] Weigh 63.36g of Y 2 O 3 , 48.16gAl 2 O 3 , 0.952gNd 2 O 3 , 0.48g of magnesium silicate mass. Add 200g of anhydrous ethanol, and 400g of alumina grinding balls, ball mill at 180r / min for 15h, after ball milling, the powder is dried, sieved, and then formed by dry pressing at 10MPa, and then cold isostatic pressing at 200MPa. The ceramic green body was sintered in vacuum at 1730°C for 10h. The linear transmittance curve of the prepared Nd:YAG ceramic with double-sided polishing and thickness of 4 mm is as follows: image 3 shown.

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Abstract

The invention discloses a method for preparing Nd: YAG transparent ceramic by using magnesium silicate as a sintering aid. During the preparation process, Nd2O3 powder, Y2O powder and Al2O3 powder are weighed in a stoichiometric ratio and 0.1-0.4% magnesium silicate is added in the powder; the powder is ball-milled and mixed, and then subjected to drying, sieving, dry pressing and isostatic cool pressing treatments to obtain a ceramic biscuit; the ceramic biscuit is sintered for 5-20 hours in vacuum at 1700-1800 DEG C to obtain a transparent ceramic sintered body; air pores are eliminated by a liquid phase generated by the sintering aid during the sintering process, and MgO in the sintering aid is capable of inhibiting the abnormal growth of crystalline grains. The method disclosed by the invention is capable of effectively improving the transparency of the Nd: YAG transparent ceramic.

Description

technical field [0001] The invention relates to the field of preparation of transparent ceramics, in particular to a method for preparing Nd:YAG transparent ceramics by using magnesium silicate as a sintering aid. Background technique [0002] Neodymium-doped yttrium aluminum garnet (Nd:Y 3 A1 5 O 12 ) is often abbreviated as Nd:YAG. It is the part Y in the yttrium aluminum garnet (YAG) crystal as the matrix 3+ activated ion Nd 3+ formed by substitution. Nd:YAG crystal is an ideal crystal material for four-level laser. Nd 3+ The outer electron configuration of 4f 3 5s 2 5p 6 , where 4f is not filled, the three electrons on 4f can be in different motion states, resulting in a series of energy levels. In the prior art, solid-phase reaction and vacuum sintering technology is used to prepare transparent YAG ceramics with a relative density of 99.98%, and its light transmittance in the visible light range reaches more than 80%. A transparent Nd:YAG ceramic laser compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622
Inventor 吉祥波邓建国黄辉康彬敬畏胥涛余盛全
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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