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ti 3 sic 2 Application of Base Ceramic Materials as Corrosion Resistant Materials of Molten Fluoride Salts

A ceramic material, melting-resistant technology, used in reactor fuel materials, devices for coating liquids on surfaces, coatings, etc., can solve the problems of high temperature peeling coating uniformity, lack of high temperature strength, etc. Effects of oxidation resistance, excellent high thermal conductivity

Active Publication Date: 2017-10-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They then specially designed the modified nickel-based alloy Hastelloy-N (17%Mo7%Cr, 5%Fe, and the rest is Ni), but Hastelloy-N lacks the high-temperature strength of other nickel-based and iron-nickel-based alloys, so Long-term service reliability remains to be resolved
[0009] Research at the University of Wisconsin-Madison has shown that the common superalloys Hastelloy-X, Haynes-230, and Inconel-617 are severely corroded in the high-temperature FLINAK molten salt environment, while Ni-201 (Ni content greater than 90%) exhibits Good corrosion resistance, but elemental pure nickel material lacks proper high temperature strength as a structural component, pyrolytic carbon (PyC) / SiC coating can improve the corrosion resistance of C / Si / SiC composite materials, Ni, Mo The coating can also improve the corrosion resistance of superalloy materials to a certain extent, but there are problems such as high temperature spalling and coating uniformity.

Method used

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  • ti <sub>3</sub> sic <sub>2</sub> Application of Base Ceramic Materials as Corrosion Resistant Materials of Molten Fluoride Salts
  • ti <sub>3</sub> sic <sub>2</sub> Application of Base Ceramic Materials as Corrosion Resistant Materials of Molten Fluoride Salts
  • ti <sub>3</sub> sic <sub>2</sub> Application of Base Ceramic Materials as Corrosion Resistant Materials of Molten Fluoride Salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, for single-phase Ti 3 SiC 2 The bulk ceramic materials were subjected to the corrosion resistance test of molten fluorine salts.

[0030] The single-phase Ti 3 SiC 2 The block is prepared by powder sintering method, specifically: Weigh an appropriate amount of commercial Ti 3 SiC 2 Powder, the Ti 3 SiC 2 The powder is put into a graphite mold and pressurized in one direction to form a green body, and then put into a spark plasma sintering (SPS) furnace, heated to 1200°C in a vacuum state, and a pressure of 40MPa is applied, and the holding time is 5min.

[0031] For the Ti prepared above 3 SiC 2 The phase of the bulk material is measured and analyzed, and its XRD spectrum is as follows figure 1 As shown, it can be seen that the bulk material has high purity and low impurity content.

[0032] The Ti 3 SiC 2 The test method for the corrosion resistance of bulk materials to molten fluorine salts is as follows: the single-phase Ti 3 SiC 2 The ...

Embodiment 2

[0041] In this example, for Ti 3 SiC 2 -10wt% SiC composite bulk material was tested for corrosion resistance to molten fluorine salts.

[0042] The composite material is Ti 3 SiC 2 -10wt% SiC, the subsequent corrosion test was carried out in FLINAK molten salt at 700 °C, and the corrosion time was 8 days (192h). The specific process is as follows:

[0043] The Ti 3 SiC 2 -10wt%SiC composite bulk material with Ti 3 SiC 2 The ceramic material is used as a matrix, and SiC is used as a composite phase, and the composite phase accounts for 10wt% of the content of the matrix.

[0044] The composite block material is prepared by powder sintering method, specifically: Weigh an appropriate amount of commercial Ti 3 SiC 2 and SiC powder, mixed by ball milling, dried and put into a graphite mold, first pressurized in one direction to form a green body, and then put into a spark plasma sintering (SPS) furnace, heated to 1350°C under the protection of Ar atmosphere, and Apply a...

Embodiment 3

[0052] In this example, for single-phase Ti 3 SiC 2 The bulk ceramic materials were subjected to the corrosion resistance test of molten fluorine salts.

[0053] The single-phase Ti 3 SiC 2 The preparation method of the bulk ceramic material is exactly the same as that of Example 1.

[0054] The Ti 3 SiC 2 The test method of the molten fluorine salt corrosion resistance of the block material is basically the same as that of Example 1, except that the temperature is raised to 850°C, and the corrosion time is 6 days (144h).

[0055] Result analysis: The size and weight of the sample before and after the molten fluoride salt corrosion test were measured by vernier calipers and analytical balance; the influence of FLINAK molten salt on the surface and section of the sample was observed by SEM; the composition changes of the surface and section of the sample were observed by EDS.

[0056] (1) The above single-phase Ti 3 SiC 2 The size and weight measurement results of the b...

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Abstract

The invention provides an application of a Ti3SiC2 based ceramic material as a melted fluorine salt corrosion resistant material. Through a large amount of experiments, the inventor finds that the corrosion speed of the Ti3SiC2 based ceramic material is extremely low in melted fluorine salt, and the melted fluorine salt corrosion resistant performance of the Ti3SiC2 based ceramic material is in the same level as that of inert metal nickel and nickel-based high-temperature alloy which are the best melted fluorine salt corrosion resistant materials. Thus the Ti3SiC2 based ceramic material can be used to build the structure of a molten salt reactor such as a shell, a container, a pipeline, and the like. The Ti3SiC2 based ceramic material can also be used as a functional electrode material in the post treatment of a spent fuel dry process taking fluorine salt as the electrolyte and can be painted on the alloy surface to form a film or coating so as to prevent melt fluorine salt corrosion.

Description

technical field [0001] The present invention relates to Ti 3 SiC 2 The technical field of ceramic-based materials, in particular, relates to the application of the ceramic material as a corrosion-resistant material for molten fluorine salts. Background technique [0002] my country is a country with small energy resources, and oil resources are quite poor. Especially with the rapid development of economy, the country's demand for energy is increasing day by day. Therefore, energy issues are related to the stability and development of the country. At present, thermal power accounts for about 80% of national electricity production, hydropower accounts for about 16%, and wind power and nuclear power account for the rest. Among them, nuclear energy has the advantages of high energy density, low carbon emissions, and potential sustainable development. Under the circumstances of global climate change, energy conservation, emission reduction, and low-carbon economy are promoting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/54B05D7/14C04B35/56
CPCC04B35/5615Y02E30/30
Inventor 黄庆周洁怀平邓启煌叶群荆雷李凌周小兵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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