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Hot-pressing reaction sintering method of gadolinium oxysulfide scintillation ceramics

A technology of scintillation ceramics and gadolinium oxysulfide, which is applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of affecting luminescence performance, being unsuitable for preparing gadolinium oxysulfide ceramics, affecting scintillation performance, etc., and achieving a simple process. , good matching, low equipment requirements

Active Publication Date: 2017-05-03
中科西卡思(苏州)科技发展有限公司
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  • Claims
  • Application Information

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Problems solved by technology

For sintering additives commonly used in sintering transparent ceramics, scintillation ceramics should be used with caution, preferably less or not, because these additives will seriously affect the scintillation performance
However, it should be treated differently. Due to the complexity of the scintillation mechanism, the addition of some ions can improve the luminescence performance, but the amount should be strictly controlled.
(Liu S, Feng X, Zhou Z, et al.Effect of Mg2+co‐doping on the scintillation performance of LuAG: Ce ceramics[J].physica statussolidi(RRL)-Rapid Research Letters,2014,8(1): 105-109.) Gadolinium oxysulfide is very easy to form a dead layer, which affects the luminescent performance
(Dolo J J, Swart H C, Terblans J J, et al. Degradation of commercial Gd2O2S:Tb phosphor[J].physica status solidi(c), 2008,5(2):594-597.) The high Although the vacuum sintering method has the advantages of low cost, high preparation efficiency, and large size, it is not suitable for the preparation of gadolinium oxysulfide ceramics. Therefore, how to improve the sintering activity of the powder and reduce the sintering driving force to reduce the The cost of preparation and the preparation of gadolinium oxysulfide ceramics with excellent performance are one of the technical difficulties that those skilled in the art hope to overcome

Method used

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  • Hot-pressing reaction sintering method of gadolinium oxysulfide scintillation ceramics

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Embodiment 1

[0045] Weigh 30g Gd 2 o 2 SO 4 Powder, 0.012g of hexapraseodymium oxide powder, 0.4g of activated carbon, put into an alumina ball mill jar, add 90g of alumina balls and a certain amount of ball milling medium, first ball mill at low speed for 30 minutes, then ball mill at high speed for 6 hours, take out and dry sieve. Weigh 3g of the above-mentioned mixture, pour it into a dry pressing mold with a diameter of 15mm, and keep the pressure at 10MPa for 2min. The heating rate of 10°C / min is raised to 850°C. During this process, the pressure is kept at 10MPa, and the pressure is kept at 850°C and 10MPa for 1 hour, and then the speed is raised to 1170°C at a rate of 10°C / min. After ℃, pressurize to 40MPa and hold for 2 hours to get Gd 2 o 2 S: Pr scintillating ceramics. Testing and characterization of ceramics after cutting and polishing. From figure 1 and figure 2 In the comparison, it can be seen that after thermal reaction sintering, the phase is changed from Gd 2 o ...

Embodiment 2

[0047] Weigh 50gGd 2 o 2 SO 4 Powder, 0.02g of hexapraseodymium oxide powder, 2.58g of activated carbon, put into an alumina ball mill jar, add 160g of alumina balls and a certain amount of ball milling medium, first ball mill at low speed for 30 minutes, then ball mill at high speed for 6 hours, take out and dry sieve. Weigh 4g of the above-mentioned mixture, pour it into a dry pressing mold with a diameter of 15mm, and keep the pressure at 10MPa for 2min. Raise the temperature to 950°C at a rate of 10°C / min, keep the pressure at 10MPa during this process, keep the pressure at 950°C and 10MPa for 1 hour, then rise to 1270°C at a rate of 10°C / min, keep the pressure at 20MPa during the heating process, and reach 1270°C After pressurizing to 40MPa, holding time for 2h, you can get Gd 2 o 2 S: Pr scintillating ceramics. Testing and characterization of ceramics after cutting and polishing. image 3 is the photoexcitation spectrum received at 513nm, where the absorption at 3...

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Abstract

The invention relates to a hot-pressing reaction sintering method for gadolinium oxysulfide scintillating ceramics, wherein the hot-pressing reaction sintering method includes the steps: Gd2O2SO4 and a reducing agent powder are mixed evenly to obtain a raw material powder, and the raw material powder is subjected to step-wise sintering, wherein the reducing agent includes activated carbon, graphene, coke and charcoal, the step-wise sintering comprises first-stage sintering at the temperature of 820-950 DEG C and the pressure of 10-75 MPa and second-stage sintering at the temperature of 1000-1500 DEG C and the pressure of 30-150 MPa, and an inert atmosphere, a reducing atmosphere or vacuum is maintained in the sintering process.

Description

technical field [0001] The invention relates to a hot-pressing reaction sintering method for gadolinium oxysulfide scintillation ceramics, belonging to the field of scintillation ceramics preparation. The components (Gd 1-x-y PR x B y ) 2 o 2 S ceramics, where B = one or two of Ce, Pr, Eu, Nd, Sm, Gd, Ho, Yb, Tm..... The sintering energy required for hot pressing reaction sintering is low, and the prepared ceramic grains are fine. The sample has excellent luminescence performance, high matching between the main emission peak and the photodiode, high detection efficiency, small afterglow, and good luminescence stability. It is the preferred scintillator for nuclear medical imaging. Background technique [0002] Scintillators are a class of materials that can absorb high-energy rays and emit visible light. They are key components of detectors and are widely used in geological exploration and other aspects. At present, scintillators mainly include crystals, ceramics, gla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C04B35/50
Inventor 王伟寇华敏刘秉龙李江刘书萍石云潘裕柏冯锡琪郭景坤
Owner 中科西卡思(苏州)科技发展有限公司
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