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

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...

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