Multi-metal carbide modified carbon-based material and preparation method thereof

A multi-metal, carbon-based material technology, applied in electrical components, spark gaps, spark gap parts, etc., can solve the problems of high discharge ablation volume rate, poor bonding strength, and difficult preparation.

Active Publication Date: 2021-05-14
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a carbon-based electrode material modified by multiple metal carbides and a preparation method thereof, which are used to overcome the shortcomings of graphite electrodes in the prior art such as easy outgassing and high discharge ablation volume rate, and at the same time overcome the disadvantages of the prior art Defects such as poor bonding strength between the medium-refractory metal carbide coating and the graphite substrate, and difficulty in preparation

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  • Multi-metal carbide modified carbon-based material and preparation method thereof
  • Multi-metal carbide modified carbon-based material and preparation method thereof
  • Multi-metal carbide modified carbon-based material and preparation method thereof

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preparation example Construction

[0039] The present invention proposes a method for preparing a carbon-based material modified by a multi-element metal carbide, comprising the following steps:

[0040] S1: Use metal Hf as the reaction source, metal fluoride mixture as the active agent, and the mixed salt of NaCl and KCl as the molten salt medium;

[0041] Weighing the metal elemental Hf, the metal fluoride mixture and the mixed salt of NaCl and KCl, and mixing them uniformly to obtain the mixture;

[0042] The metal fluoride mixture includes two or three metal fluorides of different metals, and the metal fluoride is K 2 TiF 6 、K 2 ZrF 6 and K 2 TaF 7 at least two of the

[0043] S2: using graphite as a matrix, placing the graphite and the mixture in a vacuum furnace;

[0044] Graphite is washed and dried before use. The shape of the graphite matrix is ​​not limited in any way, its size is only limited by the size of the container and furnace chamber used.

[0045] S3: Repeatedly evacuate the vacuum f...

Embodiment 1

[0066] This embodiment provides a carbon-based material modified by a multi-element metal carbide, which is a (Hf, Zr, Ti) C coating on the surface of a graphite substrate. The (Hf, Zr, Ti) C coating is mainly passed on the graphite substrate. Formed by the disproportionation reaction of molten salt, the (Hf, Zr, Ti) C fills the surface and internal pores of the graphite matrix.

[0067] In this embodiment, the (Hf, Zr, Ti)C has a decreasing quantity gradient from the surface of the graphite matrix to the interior of the graphite matrix, and the penetration depth of (Hf, Zr, Ti)C into the interior of the graphite matrix is ​​about 200 μm.

[0068] This embodiment also provides a method for preparing the above-mentioned multi-element metal carbide modified carbon-based material, comprising the following steps:

[0069] (1) The graphite sample was ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at...

Embodiment 2

[0079] This embodiment provides a carbon-based material modified by a multi-element metal carbide, which is a (Hf, Ti, Ta) C coating on the surface of a graphite substrate. The (Hf, Ti, Ta) C coating is mainly passed on the graphite substrate. Formed by the disproportionation reaction of molten salt, the (Hf,Ti,Ta)C is filled in the pores on the surface and inside of the graphite matrix.

[0080] In this embodiment, the (Hf, Ti, Ta)C has a composition gradient from the surface of the graphite matrix to the interior of the graphite matrix, and the penetration depth of (Hf, Ti, Ta)C into the interior of the graphite matrix is ​​about 80 μm.

[0081] This embodiment also provides a method for preparing the above-mentioned multi-element metal carbide modified carbon-based material, including:

[0082] (1) The graphite sample was ultrasonically cleaned with ethanol for 10 minutes, then ultrasonically cleaned with deionized water for 5 minutes, and then dried at 150°C for 60 minutes...

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Abstract

The invention discloses a multi-metal carbide modified carbon-based material and a preparation method thereof. The method comprises the steps that metal elementary substance Hf serves as a reaction source, a metal fluoride acid salt mixture serves as an active agent, a mixed salt of NaCl and KCl serves as a molten salt medium, graphite serves as a matrix, the mixed salt of the KCl and the NaCl is heated to be in a molten state; the metal elementary substance Hf and the metal fluoride are subjected to a combination reaction in a molten salt medium in a molten state to generate active metal atoms, and when the active metal atoms make contact with a carbon material, the combination reaction is carried out to form multi-element metal carbide. The number of the coatings is gradually reduced from the surface of the substrate to the interior of the substrate, so that the matching of thermal expansion coefficients between the coatings and the substrate is favorably improved, and a good binding force and thermal shock resistance between the coatings and the substrate are ensured; in addition, the method is simple in process, low in cost and high in operability, raw materials are easy to obtain, the shape of the graphite matrix in the method is not limited, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of pulse power, in particular to a multi-element metal carbide modified carbon-based material and a preparation method thereof. Background technique [0002] In recent years, pulse power technology has developed rapidly, and switching technology is one of the key technologies that limit its development. The gas spark switch has a series of advantages such as high working voltage, large switching current, small conduction resistance, long life, firm structure and convenient use, and is widely used in many fields such as high-voltage pulse generators. Due to the ablation pits will be generated on the electrode surface of the gas spark switch under the action of high current, which will intensify the jitter when the switch breaks down, thus affecting the stability and service life of the switch. Graphite has a high melting point, good heat resistance, and good thermal and electrical conductivity. Compared with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87H01T1/22
CPCC04B41/009C04B41/5057C04B41/87H01T1/22C04B35/522C04B41/4556C04B41/4525C04B41/4517
Inventor 万红华叶龚瑾瑜张全才朱利安
Owner NAT UNIV OF DEFENSE TECH
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