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a kind of uo 2 -zro 2 Method for preparing samples for microstructural analysis of ceramic fuels

A uo2-zro2, microstructure technology, used in the manufacture of reactors, reduction of greenhouse gases, reactors, etc., can solve the problems of inability to obtain the microstructure and morphology of fuel pellets, and achieve process parameters that are easy to control, easy to implement, low cost effect

Active Publication Date: 2020-09-08
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • 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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  • a kind of uo <sub>2</sub> -zro <sub>2</sub> Method for preparing samples for microstructural analysis of ceramic fuels
  • a kind of uo <sub>2</sub> -zro <sub>2</sub> Method for preparing samples for microstructural analysis of ceramic fuels
  • a kind of uo <sub>2</sub> -zro <sub>2</sub> Method for preparing samples for microstructural analysis of ceramic fuels

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Effect test

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 and corrode for 50s to 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 UO 2 -ZrO 2 A method for preparing a sample for ceramic fuel microstructure analysis, the sample for microstructure analysis uses a mixed solution of ammonium bifluoride and high-purity deionized water as an etchant, and the ratio of the ammonium bifluoride and high-purity deionized water is 1g:1ml; the mixed solution was used to etch UO 2 -ZrO 2 Ceramic fuel, UO after etching 2 -ZrO 2 Ceramic fuels are used for microstructural analysis. The present invention can well demonstrate the novel, high-performance UO 2 -ZrO 2 The well-defined microstructure of ceramic fuel pellets, especially the grain morphology and grain boundary 2 -ZrO 2 The preparation process and performance improvement of ceramic fuels have laid a foundation; and the process technology route is simple, the process parameters are easy to control, there are no strict requirements on process equipment and related experimental vessels, and it is easy to implement.

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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Patent Type & Authority Patents(China)
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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