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Pressureless sintering preparation method of Ce:Lu2SiO5 polycrystal flicker optical ceramics

An optical ceramics and preparation process technology, applied in the field of preparation of polycrystalline scintillation optical ceramics, can solve the problems of sample contamination, cracking, increase equipment requirements, etc., and achieve the effects of reducing intermediate steps, simplifying the preparation process, and fast decay characteristics

Inactive Publication Date: 2012-07-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from existing reports, Ce:Lu 2 SiO 5 The densification process of ceramics is mostly completed with the assistance of pressure, which inevitably causes sample contamination and local cracking, and also increases the requirements for equipment

Method used

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  • Pressureless sintering preparation method of Ce:Lu2SiO5 polycrystal flicker optical ceramics
  • Pressureless sintering preparation method of Ce:Lu2SiO5 polycrystal flicker optical ceramics
  • Pressureless sintering preparation method of Ce:Lu2SiO5 polycrystal flicker optical ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 20 g of lutetium chloride (LuCl 3 ) and 8.05ml of tetraethyl orthosilicate (Si(C 2 h 5 O) 4 ) dissolved in 142.5 ml of isopropanol ((CH 3 O) 2 CHOH), add another 0.68 ml concentration of 0.522 mol / L cerium nitrate (Ce(NO 3 ) 3 ), followed by adding 99.61 mol propylene oxide (C 3 h 6O), a white gel-like precipitate was obtained after stirring for 30 hours. The precipitate was dried under air atmosphere at 60°C for 24 hours, then calcined and synthesized in a muffle furnace at 1100°C, and kept for 2 hours to obtain submicron 0.5mol%Ce:Lu 2 SiO 5 Luminous powder.

[0029] The obtained powder was first placed in a stainless steel mold with an inner diameter of Φ10 mm, and double-pressed under a pressure of 1 MPa, and then the sample was sealed and pressed under a cold isostatic pressure of 200 MPa to form a powder with a relative density of 51%. Plain embryo. Finally, place the shaped green body in a hydrogen furnace for H 2 Pressureless sintering process unde...

Embodiment 2

[0031] 40 g of lutetium chloride (LuCl 3 ) and 16.1 ml of tetraethyl orthosilicate (Si(C 2 h 5 O) 4 ) dissolved in 142.5 ml of isopropanol ((CH 3 O) 2 CHOH), add another 0.68 ml concentration of 0.522 mol / L cerium nitrate (Ce(NO 3 ) 3 ), followed by adding 199.22 mol propylene oxide (C 3 h 6 O), a white gel-like precipitate was obtained after stirring for 30 hours. The precipitate was dried under air atmosphere at 60°C for 24 hours, then calcined and synthesized in a muffle furnace at 1100°C, and kept for 2 hours to obtain submicron 0.25mol% Ce:Lu 2 SiO 5 Luminous powder.

[0032] The obtained powder was first placed in a stainless steel mold with an inner diameter of Φ20 mm, and double-pressed under a pressure of 4 MPa, and then the sample was pressed under a cold isostatic pressure of 200 MPa to form a green body with a relative density of 50%. . Finally, put the formed blank in a hydrogen furnace through a reducing atmosphere pressureless sintering process, and ...

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Abstract

The invention relates to a method for preparing Ce:Lu2SiO5 polycrystal flicker optical ceramics by adopting a pressureless sintering process, which belongs to the technical field of a preparation process of rare earth doped polycrystal flicker optical ceramics. The method adopts a sol-gel method to compose signal-phase sub-micron level Ce:Lu2SiO5 ceramic powder at low temperature, dry pressing and isostatic pressing are carried out on the powder, then pressureless sintering is carried out on the powder at 1600-1800 DEG C under flowing H2 atmosphere condition to obtain the Ce:Lu2SiO5 polycrystal flicker optical ceramics. relative density of the obtained materials achieves more than 98.5% of the theoretical density, has good lighting acts under stimulation of the X-ray, and a main emission peak is located at 440nm.

Description

technical field [0001] The present invention relates to Lu 2 SiO 5 as the matrix, Ce 3+ A method for the preparation of polycrystalline scintillation optical ceramics in which ions are active ions, more precisely it involves the low-temperature synthesis of Ce:Lu by sol-gel method 2 SiO 5 Powder and its H 2 The invention relates to a pressureless sintering densification method in an atmosphere, which belongs to the technical field of scintillation optical ceramics preparation. Background technique [0002] In 1983, the ceramic laboratory of GE Company in the United States first developed a ceramic scintillator named HiLight (Eu-doped Y 2 o 3 / Gd 2 o 3 Solid solution transparent ceramics), pioneered the research and development of ceramic scintillators, and then Hitachi Metals and Siemens developed Gd 2 o 2 S: Pr, Ce, F and Gd 2 o 2 S:Pr (UFC) ceramic scintillator. In the binary Re 2 o 3 -SiO 2 (where Re=Lu 3+ , Y 3+ 、Gd 3+ ) In the rare earth silicate syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/50C04B35/64
Inventor 施鹰林挺邓莲芸任玉英谢建军
Owner SHANGHAI UNIV
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