Ceramic sintered body and plasma-generating electrode

A ceramic sintered body with a specific elemental composition and microstructure enhances oxidation resistance and reduces weight loss, improving the service life and cost-effectiveness of plasma-generating electrodes.

DE102024139770A1Undetermined Publication Date: 2026-07-02NITERRA CO LTD
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing ceramic sintered bodies used in plasma generation electrodes suffer from inadequate oxidation resistance, leading to reduced service life and increased weight loss due to oxidation and melting under plasma conditions.

Method used

A ceramic sintered body composed of specific elements such as titanium, zirconium, niobium, hafnium, tantalum, and tungsten, with yttrium or aluminum, and carbon, forming a single-phase microstructure with a solid solution, and limited elemental iron content to enhance oxidation resistance and suppress melting.

Benefits of technology

The solution significantly improves the oxidation resistance and reduces weight loss, extending the service life of the plasma-generating electrode while allowing for complex shapes and lower production costs through hot pressing.

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Abstract

The proposed ceramic sinter body contains a first determined element, selected from five or six elements chosen from titanium (Ti), vanadium (V), zirconium (Zr), niobium (Nb), molybdenum, hafnium (Hf), tantalum (Ta), and tungsten (W); a second determined element, selected from yttrium (Y) and aluminum (Al); and elemental carbon (C). The total amount of the first determined element, the second determined element, and the elemental carbon contained in the ceramic sinter body is 98 atomic percent or more. The amount of the second determined element contained in the ceramic sinter body is 3,000 atomic ppm or less. The amount of carbon contained in the ceramic sinter body is 45 atomic percent or more and 55 atomic percent or less. The ceramic sinter body has a single-phase microstructure in which the first determined element forms a solid solution.
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Citation Information

Patent Citations

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    JP6929755B2

  • Easy-to-sinter wear-resistant friction-reducing high-entropy ceramic material and preparation method thereof

    CN114031406A

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    EP4119524A1

  • CN000114031406A