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Method for preparing sulfuric oxide ceramic scintillating medium

A technology of oxysulfide and scintillator, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of high cost and achieve the effect of improving sintering performance and low cost

Inactive Publication Date: 2018-02-13
上海烁璞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of Siemens' hot pressing, Hitachi's cladding hot isostatic pressing, or Saint-Gobain's hot pressing, heating and isostatic pressing sintering technology, they are all relatively high from the perspective of cost.

Method used

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  • Method for preparing sulfuric oxide ceramic scintillating medium
  • Method for preparing sulfuric oxide ceramic scintillating medium

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preparation example Construction

[0030] The invention provides a preparation method of a sulfur oxide ceramic scintillator. The present invention uses sulfur oxide powder as a raw material and adopts the technology of pressureless sintering + hot isostatic pressing to prepare a dense sulfur oxide ceramic scintillator. Hereinafter, as an example, the method of the present invention will be specifically described.

[0031] In the present invention, the chemical composition of the sulfur oxide powder as raw material can be expressed as: R 2(1-x) m 2x o 2 S, R is one or more combinations of Y, Gd, La, Lu, M is one or more of Pr, Ce, Tb, Eu, Yb, Nd, Er, Ho, 0≤x-6 ≤x≤5×10 -2 , further preferably, 2×10 -6 ≤x≤5×10 -3 .

[0032] The sulfur oxide powder is preferably an ultrafine powder, for example, its size is about 0.5 micron (preferably below 0.5 micron), and its specific surface area is not less than 5m 2 / g, which can have higher sintering activity, and is suitable for sintering by pressureless sintering c...

Synthetic example 1

[0050] Gd 2 o 2 Synthesis of S powder:

[0051] Weigh 50g Gd 2 o 3 , 0.1g Pr 6 o 11 and 0.01g CeO 2 , mix and add in 30mL nitric acid (concentration is 68%) to obtain rare earth nitrate solution. Add the above-mentioned rare earth nitrate solution into 45mL of ammonia water (concentration: 2mol / l), make the pH of the mixed solution 10, react at room temperature to 50°C for about 0.5 hours, and a white precipitate will appear, and the white suspension solution is repeatedly sucked and filtered , drying at 100 degrees to obtain the precursor. Then the precursor was placed in a tube furnace at 850 °C, and H 2 S gas, last for 3h, then get Gd 2 o 2 S: Pr, Ce pure phase luminescent powder. After testing, the obtained Gd 2 o 2 The purity of S powder is 100%, the average particle size is 30nm, and the specific surface area is 10m 2 / g.

Synthetic example 2

[0053] Gd 2 o 2 Synthesis of S powder:

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Abstract

The invention relates to a method for preparing a sulfuric oxide ceramic scintillating medium. The method comprises the following steps: mixing sulfur oxide powder with low melting point sintering aids, and performing ball milling to obtain mixed powder, wherein the chemical constitution formula of the sulfur oxide powder is R2(1-x)M2xO2S, in the formula, R is at least one of Y, Gd, La and Lu; M is at least one of Pr, Ce, Tb, Eu, Yb, Nd, Er and Ho; x is greater than or equal to 0 and less than 1; preferably x is greater than or equal to 1*10<6> and less than or equal to 5*10<2>; molding the obtained mixed powder to obtain a crude blank; performing pressureless sintering on the crude blank in vacuum or in the presence of a protection atmosphere at 1100-1500 DEG C to obtain a pre-sintered substance; performing hot isostatic pressing sintering on the pre-sintered substance in the presence of the protection atmosphere at 1100-1500 DEG C at the pressure of 100-250MPa, thereby obtaining thesulfuric oxide ceramic scintillating medium. By adopting the method, complete densification of the sulfuric oxide ceramic scintillating medium is successfully achieved, and mass production can be possibly achieved with very low cost.

Description

technical field [0001] The invention relates to a preparation method of a sulfur oxide ceramic scintillator, belonging to the field of ceramic preparation. Background technique [0002] Rare earth oxysulfide scintillators are widely used in highly sensitive radiation detectors, such as X-CT, due to their high density and excellent luminescence properties. In the series of rare earth sulfur oxides, Gd 2 o 2 S (referred to as GOS for short) is one of the most important substrates, and the Pr-doped Gd 2 o 2 S is again the most versatile scintillator in radiation detection, such as medical CT. At present, GOS flashing ceramics are monopolized by Siemens, Hitachi and Toshiba, and the market price is extremely high. We have successfully realized the production of sulfur oxide powder through technological innovation, which is completely different from any of the above three. For sintering, Siemens adopts the hot pressing sintering method, using graphite molds to produce a pie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C09K11/78
CPCC04B35/50C04B35/622C04B2235/3224C04B2235/3229C04B2235/77C04B2235/781C04B2235/9646C09K11/7769
Inventor 陈启伟
Owner 上海烁璞新材料有限公司
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