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Preparation method of sample for microstructure analysis of UO2-ZrO2 ceramic fuel

A technology of uo2-zro2 and microstructure, which is applied in the direction of manufacturing reactors, nuclear power generation, climate sustainability, etc., can solve the problem that the microstructure and morphology of fuel pellets cannot be obtained, and achieve easy control of process parameters and process The technical route is simple and the effect is easy to achieve

Active Publication Date: 2019-08-02
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is: adopt traditional pure UO 2 Fuel etching solution, unable to effectively reveal UO 2 -ZrO 2 The grain boundaries of the ceramic fuel pellets cannot obtain the microstructure and morphology of the fuel pellets. The present invention provides a UO that solves the above problems 2 -ZrO 2 Method for preparing samples for microstructural analysis of ceramic fuels

Method used

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  • Preparation method of sample for microstructure analysis of UO2-ZrO2 ceramic fuel
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  • Preparation method of sample for microstructure analysis of UO2-ZrO2 ceramic fuel

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Embodiment 1

[0035] Select UO 2 -ZrO 2 ZrO in ceramic fuel pellets 2 For samples with a content in the range of 0wt% to 10wt%, a solution formed by mixing 50g of analytically pure ammonium bifluoride and 50ml of high-purity deionized water was used as the corrosion UO 2 -ZrO 2 Etchant for ceramic fuel; the above solution is heated to boiling on an electric heating furnace, and the pretreated UO 2 -ZrO 2 The ceramic fuel sample is put into the solution and corroded for 20s~30s, and UO can be etched out. 2 -ZrO 2 The clear grain morphology and grain boundary outline of the ceramic fuel pellets, the complete microstructure was observed under the scanning electron microscope, such as figure 1 As shown, the working voltage is 180KV, the magnification is 5000x, and the working distance is 30μm.

Embodiment 2

[0037] Select UO 2 -ZrO 2 ZrO in ceramic fuel pellets 2 For samples with a content in the range of 10wt% to 15wt%, a solution formed by mixing 50g of analytically pure ammonium bifluoride and 50ml of high-purity deionized water was used as the corrosion UO 2 -ZrO 2 Etchant for ceramic fuel; the above solution is heated to boiling on an electric heating furnace, and the pretreated UO 2 -ZrO 2 The ceramic fuel sample is put into the solution and corroded for 30s~50s, and UO can be etched out. 2 -ZrO 2 The clear grain morphology and grain boundary outline of the ceramic fuel pellets, the complete microstructure was observed under the scanning electron microscope, such as figure 2 As shown, the working voltage is 180KV, the magnification is 5000x, and the working distance is 30μm.

Embodiment 3

[0039] Select UO 2 -ZrO 2 ZrO in ceramic fuel pellets 2 For samples with a content in the range of 15wt% to 20wt%, the solution formed by mixing 50g of analytically pure ammonium bifluoride and 50ml of high-purity deionized water was used as the corrosion UO 2 -ZrO 2 Etchant for ceramic fuel, heated to boiling on an electric heating furnace, quickly put the polished and polished sample into the solution to etch for 50s~70s, and UO can be etched 2 -ZrO 2 The clear grain morphology and grain boundary outline of the ceramic fuel pellets, the complete microstructure was observed under the scanning electron microscope, such as image 3 As shown, the working voltage is 200KV, the magnification is 5000x, and the working distance is 30μm.

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Abstract

The invention discloses a preparation method of a sample for microstructure analysis of UO2-ZrO2 ceramic fuel. The sample for the microstructure analysis adopts a mixed solution of ammonium bifluorideand high-purity deionized water as an etchant; a matching ratio of ammonium bifluoride to the high-purity deionized water is 1g:1ml; the mixed solution is used for etching the UO2-ZrO2 ceramic fuel;and the etched UO2-ZrO2 ceramic fuel is used for the microstructure analysis. A clear microstructure of a novel and high-performance UO2-ZrO2 ceramic fuel pellet, particularly a crystal grain patternand a crystal boundary contour, can be well shown; a foundation is laid for optimizing a preparation technology and performance improvement of the UO2-ZrO2 ceramic fuel; a technical route is simple; technical parameters are easy to control; and the preparation method does not have rigorous requirements on technical equipment and relevant experiment ware and is easy to realize.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor fuel, in particular to a UO 2 -ZrO 2 Preparation of samples for microstructural analysis of ceramic fuels. Background technique [0002] As a clean and efficient non-fossil energy, nuclear power has played an extremely important role in coping with environmental degradation and alleviating the energy crisis in many countries in the world in recent years. The core of nuclear power technology is nuclear reactor technology. In order to improve the safety and economy of nuclear reactors and relieve the pressure of spent fuel reprocessing, nuclear fuel elements, as the core components of nuclear reactors, are developing towards high unloading fuel consumption and long refueling cycle. In order to improve the unloading fuel consumption of fuel elements, prolong the refueling period, and improve and enhance the in-core irradiation performance of fuel, it is an important issue that must be faced...

Claims

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Application Information

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IPC IPC(8): G21C21/02C04B41/91
CPCC04B41/5353C04B41/91G21C21/02Y02E30/30
Inventor 肖红星蒋宏曼王晓敏龙冲生张瑞谦商佳程陈勇
Owner NUCLEAR POWER INSTITUTE OF CHINA
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