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Novel transparent glitter ceramic with garnet structure and preparation method thereof

A transparent ceramic and garnet technology, applied in the field of scintillation ceramic material system and its preparation, can solve the problems of difficult preparation, high cost of material preparation, and reduced luminous efficiency, etc., and achieve the effect of easy industrial production, high optical performance, and simple process

Active Publication Date: 2013-11-20
宁波虔东科浩光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In 1988, the world's first scintillation transparent ceramic (YGO) was manufactured by GE Company of the United States, but its decay time was long (about 1ms), which could no longer meet the current requirements of medical CT for fast scanning; in the 1990's, GE Company devoted itself to GGG (Gadolinium gallium garnet) scintillation ceramic research and development, but there is still no relevant commercial report, mainly because this material is difficult to prepare, and the prepared products have many defects, which will reduce the luminous efficiency
[0005] In 1998, Germany's Siemens, Japan's Hitachi and other companies successively developed GOS (gadolinium oxysulfide) scintillation ceramics for CT detectors. However, GOS has a hexagonal structure, and optical anisotropy can only be made translucent, and light scattering will reduce detection. Efficiency; In 2008, after 7 years of hard work, GE Company of the United States developed (Lu,Tb) 3 Al 5 o 12 :Ce scintillation ceramics make its latest X-CT product Discovery CT750HD successfully launched, but the high cost of material preparation is its biggest shortcoming

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  • Novel transparent glitter ceramic with garnet structure and preparation method thereof
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  • Novel transparent glitter ceramic with garnet structure and preparation method thereof

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preparation example Construction

[0069] In a preferred embodiment of the present invention, the preparation method of the scintillation transparent ceramic system with garnet structure includes the steps of batching, drying, burning, molding, sintering, annealing, etc.:

[0070] 1) Ingredients: Commercially available raw materials with a purity of more than 99.99% or below the micron level are used, and there is no need to reprocess the raw materials, which can save costs and facilitate industrialization. Precise batching is carried out according to the above structural formula, and uniform mixing is carried out on a high-energy planetary ball mill. The medium used includes but is not limited to deionized water, absolute ethanol, acetone, glycerin or a combination thereof. The ball mill tank and balls used are PTFE products, such burning can remove organic impurities (PTFE, etc.) and effectively avoid the doping of impurity ions. In order to improve the efficiency of ball milling, we design the ball diameter ...

Embodiment 1

[0086] Example 1: (x=0.005, y=0.1, z=0.6, m=3), Re is Ce, A is Gd, C is Ga, namely Ce 0.005 (Lu 0.1 Gd 0.9 ) 2.995 (Al 0.6 Ga 0.4 ) 5 o 12

[0087] Commercially available high-purity (99.99%) Lu 2 o 3 (2μm), Gd 2 o 3 (2μm), Al 2 o 3 (0.2μm), Ga 2 o 3 (2μm), CeO 2 (50nm) as the starting material, accurately weigh the mass of each oxide according to the above formula, use absolute ethanol as the ball milling medium, and use polytetrafluoroethylene balls as the grinding balls, according to the mass ratio ball: material: absolute ethanol ≈ 6: 1:1.2, mixing materials by high-energy planetary ball mill, ball milling speed 300r / min, ball milling time 12h, the obtained slurry is dried in a blast drying oven at 60°C for 12h, and the obtained powder is treated above 600°C for 2-4 hours, Grind in an alumina crucible, pass through a 200-mesh sieve to obtain the required powder, and then press it into a disc with a diameter of 50mm in a steel mold and use cold isostatic pre...

Embodiment 2

[0090] Using the green body obtained in Example 1, vacuum sintering is adopted. The specific process is: bury the green body in yttrium oxide powder (the particle size is greater than 10 microns after high-temperature burning), and keep the vacuum degree of the furnace body at 10 -3 Between Pa-0.02MPa (the requirement for vacuum degree is not high), then raise the temperature at 5°C° / min to 1250°C for 2 hours, then raise the temperature at 3°C / min to 1650°C for 5 hours, the surface is mechanically ground and Optically polished and annealed in air at 1200°C for 48 hours, the thickness of the obtained transparent ceramic is 1.5mm, the average grain size is about 9.4μm, the transmittance at the emission wavelength of 558nm is 69%, the decay time is 55ns; the density is 6.52 g / cm 3 .

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Abstract

The invention discloses a novel transparent glitter ceramic with a garnet structure and a preparation method thereof. The glitter transparent ceramic has the garnet structure, and the general formula of the ceramic is as follows: Rex: (A1-yBy)m-x(C1-zDz)8-mO12, wherein the definitions of Re, A, B, C, D, x, y, z and m are stated in a specification and claims. The preparation method of the glitter transparent ceramic comprises the steps of burdening, drying, firing, grinding, moulding, sintering and cooling. The glitter transparent ceramic has the advantages of high optical property, fast attenuation, high density and low cost, and can be applied to modern nuclear medical diagnosis equipment.

Description

technical field [0001] The invention relates to the field of rare earth transparent ceramic products, in particular to a scintillation ceramic material system with a garnet structure and a preparation method thereof. Background technique [0002] Scintillation material is a key component of modern high-energy detectors. It can convert high-energy X-rays into visible light, match with optical sensors (such as photomultiplier tubes, etc.), and finally convert them into electrical signals, and convert the information carried by X-rays into digital signals ( picture) is presented. [0003] After more than 20 years of research and development, a variety of scintillation ceramics have replaced single crystals in the field of nuclear medical imaging. Compared with single crystals, scintillation ceramics have simple preparation process, low cost, easy mass production, and high concentration of activated ions. Doping and other advantages, has broad commercial application prospects. ...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622G01T1/20
Inventor 陈先强江浩川蒋俊罗朝华张烨杨胜辉
Owner 宁波虔东科浩光电科技有限公司
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