# US 11,897,773 B2 · Carbide-coated carbon material

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- Number: US 11,897,773 B2
- Document ID: US11897773B2
- Status: Granted
- Kind: B2
- Application number: 18/004,342
- Filed: 2021-06-07
- Published: 2023-10-05
- Granted: 2024-02-13
- Earliest claimed: 2020-07-07
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Akihiro Hirate; Waichi Yamamura
- Web page: https://patentgrep.com/patent/US11897773B2

## CPC

- C01B 32/21: After-treatment
- C01B 32/00: Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48)
- C01B 32/914: Carbides of single elements
- C23C 16/32: Carbides
- C01P 2002/54: one element only
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A carbide-coated carbon material including a base material containing carbon as a main component and chlorine, and a carbide layer containing a carbide as a main component and chlorine, the carbide layer being disposed on the base material. The base material has, near an interface between the base material and the carbide layer, a base material buffer region where a chlorine concentration continuously changes in a direction toward the carbide layer. The carbide layer has, near the interface between the base material and the carbide layer, a carbide layer buffer region where the chlorine concentration continuously changes in a direction toward the base material. The carbide-coated carbon material has sufficient adhesion strength in the interface between the carbide layer and the base material containing carbon as a main component.

## Claims

### Claim 1

A carbide-coated carbon material comprising:
a base material containing carbon as a main component and chlorine; and
a carbide layer containing a carbide as a main component and chlorine, the carbide layer being disposed on the base material, wherein
the base material has, near an interface between the base material and the carbide layer, a base material buffer region where a chlorine concentration continuously changes in a direction toward the carbide layer,
the carbide layer has, near the interface between the base material and the carbide layer, a carbide layer buffer region where the chlorine concentration continuously changes in a direction toward the base material, and
the maximum values of chlorine concentrations at the base material buffer region and the carbide layer buffer region are 10,000 ppm or less.

### Claim 2 (depends on 1)

The carbide-coated carbon material according to claim 1, wherein
the base material buffer region and the carbide layer buffer region are a first buffer region where the chlorine concentration continuously increases in a direction from the carbide layer to the base material or a second buffer region where the chlorine concentration continuously decreases in the direction from the carbide layer to the base material, respectively.

### Claim 3 (depends on 1)

The carbide-coated carbon material according to claim 1, wherein
the chlorine concentrations at the base material buffer region and the carbide layer buffer region near the interface between the base material and the carbide layer are a local maximum value.

### Claim 4 (depends on 1)

The carbide-coated carbon material according to claim 1, wherein
the chlorine concentrations at the base material buffer region and the carbide layer buffer region each change within a range of 10 ppm or more and 5,000 ppm or less.

### Claim 5 (depends on 1)

The carbide-coated carbon material according to claim 1, wherein
a total thickness of the base material buffer region and the carbide layer buffer region is 200 μm or less.

### Claim 6 (depends on 1)

The carbide-coated carbon material according to claim 1, wherein the carbide is tantalum carbide.