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High light output quick attenuation flash ceramic and its preparing method

A technology of scintillation ceramics and high gloss applied in the field of scintillation ceramics

Inactive Publication Date: 2008-01-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Gd 2 o 2 S is a hexagonal structure and can only prepare translucent ceramics

Method used

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  • High light output quick attenuation flash ceramic and its preparing method
  • High light output quick attenuation flash ceramic and its preparing method
  • High light output quick attenuation flash ceramic and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 0.0199 mol HfO(NO 3 ) 2 , 0.0001 mol TiO(NO 3 ) 2 , 0.02 mol La(NO 3 ) 3 The powder prepared by combustion reaction with 0.054 mol glycine was calcined at 800°C for 2 hours to remove residual carbon and organic matter. Calcined and combusted La 2 Hf 2 o 7 The powder is first subjected to isoaxial pressing, and then isostatically pressed at 180MPa. The products formed by isostatic pressing are kept in a hydrogen atmosphere at 1900°C for 6 hours. The sintered samples were annealed at 1150°C for 4 hours in an air atmosphere.

[0033] The composition and properties of the obtained transparent scintillation ceramics are as follows:

[0034] Composition: La 2 Hf 1.99 Ti 0.01 o 7

[0035] Relative density: >99.9%

[0036] Density (g / cm 3 ): >7.8

[0037] Crystal phase (X diffraction analysis): La 2 Hf 2 o 7

[0038] Porosity (%): <0.1

[0039] 400-800nm ​​band maximum transmittance (%): >50

[0040] Light Output: Better than CaWO 4 scintillation crysta...

Embodiment 2

[0042] 0.0198 mol HfO(NO 3 ) 2 , 0.0002 mol TiO(NO 3 ) 2 , 0.02 mol La(NO 3 ) 3 The powder prepared by combustion reaction with 0.054 mol glycine was calcined at 800°C for 2 hours to remove residual carbon and organic matter. Calcined and combusted La 2 Hf 2 o 7The powder is first subjected to isoaxial pressing, and then isostatically pressed at 180MPa. The products formed by isostatic pressing are kept in a hydrogen atmosphere at 1900°C for 6 hours. The sintered samples were annealed at 1150°C for 4 hours in an air atmosphere.

[0043] The composition and properties of the obtained transparent scintillation ceramics are as follows:

[0044] Composition: La 2 f 1.98 Ti 0.02 o 7

[0045] Relative density: >99.9%

[0046] Density (g / cm 3 ): >7.8

[0047] Crystal phase (X diffraction analysis): La 2 f 2 o 7

[0048] Porosity (%): <0.1

[0049] 400-800nm ​​band maximum transmittance (%): >50

[0050] Light Output: Better than CaWO 4 scintillation crystal ...

Embodiment 3

[0053] 0.0196 mol HfO(NO 3 ) 2 , 0.0004 mol TiO(NO 3 ) 2 , 0.02 mol La(NO 3 ) 3 The powder prepared by combustion reaction with 0.054 mol glycine was calcined at 800°C for 2 hours to remove residual carbon and organic matter. Calcined and combusted La 2 f 2 o 7 The powder is first subjected to isoaxial pressing, and then isostatically pressed at 180MPa. The products formed by isostatic pressing are kept in a hydrogen atmosphere at 1900°C for 9 hours. The sintered samples were annealed at 1200°C for 2 hours in an air atmosphere.

[0054] The composition and properties of the obtained transparent scintillation ceramics are as follows:

[0055] Composition: La 2 f 1.96 Ti 0.04 o 7

[0056] Relative density: >99.9%

[0057] Density (g / cm 3 ): >7.8

[0058] Crystal phase (X diffraction analysis): La 2 f 2 o 7

[0059] Porosity (%): <0.1

[0060] 400-800nm ​​band maximum transmittance (%): >50

[0061] Light Output: Better than CaWO 4 scintillation crystal ...

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Abstract

The present invention relates to one kind of flash ceramic with high light output and quick attenuation and its preparation process, and belongs to the field of flash ceramic technology. The present invention features that the flash ceramic has the composition of La2Hf2-xTi2xO7, with x being 0-0.1. The present invention has low temperature combustion synthesized nanometer powder as initial powder, adopts no-pressure sintering process in hydrogen and is suitable for industrial production. The transparent flash ceramic has high light output, quick attenuation and high X-ray absorbing capacity.

Description

technical field [0001] The invention relates to scintillation ceramics with lanthanum hafnate as a matrix and tetravalent titanium ions as active ions and a preparation method thereof, belonging to the field of scintillation ceramics. Background technique [0002] X-CT (X-ray computed tomography) is an important medical diagnostic equipment; X-ray detector is its core part, which determines its imaging performance. At present, X-CT generally uses a solid-state detector coupled with a scintillator silicon photodiode array: the scintillation material converts the energy of the absorbed X-rays into visible light sensitive to the silicon photodiode; the visible light is then converted into a current by the coupled silicon photodiode array, and then Convert the information carried by X-rays into images for display. [0003] X-CT performance requirements for scintillators are: (1) high light output; (2) low afterglow; (3) high X-ray absorption capacity; (4) low radiation damage; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/64
Inventor 吉亚明蒋丹宇施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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