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A method of dissolving max phase ceramic materials

A technology for ceramic materials and solutions, applied in the field of dissolving MAX phase ceramic materials, can solve the problems of difficult to achieve spent fuel reprocessing, difficult to dissolve cladding materials by chemical deshelling, and shell core separation, etc., to achieve good application prospects and reduce radioactivity. The generation of waste liquid and the effect of short dissolution cycle

Active Publication Date: 2017-12-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there are many problems with MAX-phase ceramics as cladding materials, one of which is how to achieve shell-core separation in spent fuel reprocessing
Because the MAX phase ceramic cladding material is extremely resistant to general acid and alkali (such as NaOH, hydrochloric acid, sulfuric acid, nitric acid, etc.) corrosion, and has certain resistance to molten salt, it is difficult to dissolve the cladding material by chemical shelling; The mechanical-chemical dehulling method has high requirements for equipment automation and reliability, and it is difficult for the existing equipment level to meet the requirements of spent fuel reprocessing.

Method used

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  • A method of dissolving max phase ceramic materials
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  • A method of dissolving max phase ceramic materials

Examples

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Effect test

Embodiment 1

[0036] In this embodiment, the electrolytic technology is used to dissolve Ti 3 AlC 2 Bulk materials, specific electrolytic structures such as figure 1 shown. Among them, about 3mm thick Ti 3 AlC 2 The block is used as the working electrode (anode); the counter electrode (cathode) is a platinum sheet; the reference electrode is a saturated calomel electrode; the electrolyte is a mixed solution of HF and HCl, in which the mass of HF accounts for 1% and the mass of HCl accounts for 1%. The rest is water; the electrolysis temperature is room temperature.

[0037] The specific method is as follows:

[0038] (1) Prepare the required electrolyte;

[0039] (2) Measure about 80mL of electrolyte in a 100mL plastic beaker, and pass it through high-purity nitrogen for 15min to remove oxygen to form an electrolytic cell;

[0040] (3) Insert Ti on the electrolytic cell cover in turn 3 AlC 2 working electrode, platinum counter electrode and saturated calomel electrode, and the Ti ...

Embodiment 2

[0049] In this embodiment, the electrolytic technology is used to dissolve Ti 3 SiC 2 Bulk materials, specific electrolytic structures such as figure 1 shown. Among them, about 3mm thick Ti 3 SiC 2 The block is used as the working electrode (anode); the counter electrode (cathode) is a platinum sheet; the reference electrode is a saturated calomel electrode; the electrolyte is a mixed solution of HF and HCl, in which the mass of HF accounts for 1% and the mass of HCl accounts for 1%. The rest is water; the electrolysis temperature is room temperature.

[0050] The specific method is basically the same as the method in Example 1, the difference is that Ti is used 3 SiC 2 Bulk material replaces Ti 3 AlC 2 bulk material.

[0051] above Ti 3 SiC 2 The surface scanning electron microscope (SEM) photo of the material after 10 hours of constant voltage electrolysis is as follows image 3 shown. from image 3 It can be seen that Ti 3 SiC 2 Dissolution occurred on the s...

Embodiment 3

[0055] In this embodiment, the electrolytic technology is used to dissolve Ti 3 SiC 2 Bulk materials, specific electrolytic structures such as figure 1 shown. Among them, about 3mm thick Ti 3 SiC 2 The block is used as the working electrode (anode); the counter electrode (cathode) is a platinum sheet; the reference electrode is a saturated calomel electrode; the electrolyte is a mixed solution of HF and HCl, in which the mass of HF accounts for 1% and the mass of HCl accounts for 1%. The rest is water; the electrolysis temperature is room temperature.

[0056] The specific method is basically the same as that in Example 2, except that in step (4), the voltage applied by the electrochemical workstation is reduced from 0.8V (vs. SCE) to 0.6V (vs. SCE).

[0057] above Ti 3 SiC 2 The surface scanning electron microscope (SEM) photo of the material after 10 hours of constant voltage electrolysis is as follows Figure 4 shown. from Figure 4 It can be seen that Ti 3 SiC ...

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Abstract

The invention provides a method for dissolving MAX phase ceramic materials. In this method, the MAX phase ceramic material is used as the anode, the inert electrode or the electrolyte corrosion-resistant electrode is used as the cathode, and the electrolyte is hydrofluoric acid solution for electrified electrolysis. During the electrolysis process, the MAX phase ceramic material loses electrons and enters the electrolyte in the form of ions. The dissolution of the MAX phase ceramic material is improved. The method is simple, safe and controllable, and can also be used to separate the core and shell when the MAX phase ceramic is used as the cladding material, so it has a good application prospect in technical fields such as nuclear energy system spent fuel treatment.

Description

technical field [0001] The invention relates to the technical field of MAX phase ceramic materials, in particular to a method for dissolving MAX phase ceramic materials, which can be applied to the technical fields of nuclear energy system spent fuel processing and the like. Background technique [0002] At present, most of the nuclear fuel cladding components use zirconium alloys as the preferred materials, such as low-tin zirconium-4 alloys, ZirloTM alloys developed by Westinghouse in the United States, NDA and MDA alloys in Japan, M5 alloys in France, and E635 alloys developed by the former Soviet Union, etc. . [0003] The methods used for shell-core separation of cladding materials mainly include chemical dehulling, mechanical dehulling and mechanical-chemical dehulling. [0004] Chemical dehulling uses a suitable solution to dissolve the cladding. The zirconium alloy cladding material can be chemically removed, usually by dissolving the cladding in a boiling solution...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/14
Inventor 黄庆叶群周小兵陈科周洁刘武龙
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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