Preparation method for lutetium-aluminum garnet-based transparent ceramic

A technology of lutetium aluminum garnet and transparent ceramics, which is applied in the field of preparation of lutetium aluminum garnet-based transparent ceramics, and can solve the problems of accelerating the industrialization process of lutetium aluminum garnet-based transparent ceramics and unsuccessful commercialization

Active Publication Date: 2014-02-26
宁波虔东科浩光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, except for the successful development of (Lu,Tb) by GE in the United States 3 Al 5 o 12 Except for the successful commercialization of Ce scintillating ceramics, there are no other reports of successful commercialization. Therefore, it is still necessary to accelerate the industrialization process of lutetium aluminum garnet-based transparent ceramics by optimizing the preparation process in this field.

Method used

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  • Preparation method for lutetium-aluminum garnet-based transparent ceramic
  • Preparation method for lutetium-aluminum garnet-based transparent ceramic
  • Preparation method for lutetium-aluminum garnet-based transparent ceramic

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preparation example Construction

[0063] Preparation method of lutetium aluminum garnet-based transparent ceramics

[0064] The lutetium-aluminum-garnet-based transparent ceramics of the present invention use oxides of A, B, C, D, and E as raw materials, and are prepared by co-precipitation or ball milling. After the precursor powder is prepared, the precursor powder is sequentially subjected to thermal spraying process, molding process, sintering process, hot isostatic pressing process and annealing process to obtain the lutetium aluminum garnet-based transparent ceramic of the present invention.

[0065] Wherein A is an element selected from the following group: Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Ti, Cr or Mn; B is an element selected from the following group: Y, La, Gd, Tb Or Yb; C is Lu element: D is Ga or Sc element: E is Al element. The molar ratio of each element in the raw material satisfies the following general formula: x: (1-y) × (m-x): y × (m-x): (1-z) × (8-m): z × (8-m), Wherein, x is 0.00005-0...

Embodiment 1

[0097] In this embodiment, a ball milling process, a thermal spraying process and a hot isostatic pressing process are combined to prepare lutetium aluminum garnet-based transparent ceramics. details as follows:

[0098] (1) Commercially available high-purity (99.99%) Lu 2 o 3 (2μm), Gd 2 o 3 (2μm), Al 2 o 3 (0.2μm), Ga2O3(2μm), CeO 2 (50nm) as the starting material, according to (Ce 0.015 Lu 0.1 Gd 0.885 ) 3 (Al 0.5 Ga 0.5 ) 5 o 12 Accurately weigh the mass of each oxide, 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, mix the materials through a high-energy planetary ball mill, The ball milling speed is 300r / min, the ball milling time is 12h, the obtained slurry is dried in a blast drying oven at 60°C for 12h, and the obtained powder is treated at above 600°C for 2-4 hours to obtain a precursor powder.

[0099] (2) Weigh 100g of...

Embodiment 2

[0103] In this embodiment, a ball milling process, a thermal spraying process and a hot isostatic pressing process are combined to prepare lutetium aluminum garnet-based transparent ceramics. details as follows:

[0104] (1) Weigh 100g of the precursor powder obtained in step (1) of Example 1, and put it into the special nozzle hopper of thermal spraying equipment. The fuel gas uses hydrogen, and the powder rushes to the nozzle opening with the airflow. The powder is melted into micro-droplets at high temperature, and sprayed out at a high speed with a spray speed of 800m / s. The micro-droplets hit the pre-carrier sheet and spread into a layered material with a thickness of 1000μm, and the layered material is removed from the pre-carrier sheet And ground in an alumina crucible through a 200-mesh sieve to obtain the desired powder;

[0105] (2) Press the powder in the above step (1) into a disc with a diameter of 25mm in a steel mold and treat it with cold isostatic pressing at...

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Abstract

The invention relates to a preparation method for a lutetium-aluminum garnet-based transparent ceramic. Specifically, the method comprises the following steps (a) preparing precursor powder; (b) spraying the precursor powder onto the surface of a metal carrier chip so as to form a lamellar spraying coating; (c) separating the spraying coating from the surface of the metal carrier chip and grinding the spraying coating to obtain powder; (d) molding the powder obtained in the step (c) so as to obtain a biscuit; (e) sintering the obtained biscuit and then carrying out hot isostatic pressing so as to obtain a ceramic chip; and (f) subjecting the ceramic chip obtained in the step (e) to annealing treatment so as to obtain the lutetium-aluminum garnet-based transparent ceramic. The preparation method has the advantages of simpleness, easy practicability, low cost and wide commercial prospects. The prepared transparent ceramic has excellent optical performance.

Description

technical field [0001] The invention relates to the technical field of rare earth transparent ceramics, in particular to a preparation method of lutetium aluminum garnet-based transparent ceramics. Background technique [0002] In recent years, with the development of new digital medical imaging technology, the research on scintillation materials, the key materials used in X-CT, has become more and more extensive and in-depth. In order to reduce the radiation intensity and detection time of materials as much as possible to reduce the absorption of various rays by the human body, scintillation materials are required to have good transparency, high density, short decay time, and short Afterglow and excellent physical and chemical stability. Compared with scintillation single crystals, scintillation ceramics have the advantages of easy doping of active ions, simple preparation process, low cost (high densification of materials can be completed at a temperature much lower than ...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/622
Inventor 陈先强江浩川蒋俊罗朝华肖昱琨张烨
Owner 宁波虔东科浩光电科技有限公司
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