Carbon transfer film

Patent metadata

Field	Value
Publication number	US-11845907-B2
Application number	US-202017760514-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	Sep 16, 2019
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

Provided is a carbon transfer film excellent in wear suppression and friction reduction effects. A carbon transfer film 12 contains sp2-bonded carbon, wherein a ratio of zirconium calculated by elemental analysis of a surface by SEM-EDX measurement is 0.6 mass % or lower, and a thickness is less than 100 nm. A sliding member 1 includes a substrate 11 and a carbon transfer film 12 provided on at least one surface of the substrate 11, wherein the carbon transfer film 12 contains sp2-bonded carbon and has a thickness of less than 100 nm; and a ratio of zirconium calculated from elemental analysis the carbon transfer film 12 surface by SEM-EDX measurement of is 0.6 mass % or lower. A lubricant composition contains an organic dispersion medium as a lubricant base and nanodiamond particles nanodispersed in the organic dispersion medium, wherein a content ratio of zirconia is lower than 100 mass ppm.

First claim

The invention claimed is:

1. A carbon transfer film comprising sp 2 -bonded carbon and sp 3 -bonded carbon, wherein a ratio of the sp 3 -bonded carbon to a sum of the sp 2 -bonded carbon and the sp 3 -bonded carbon, sp 3 /(sp 2 +sp 3 ), is from 0.01 to 0.2, and
a ratio of zirconium calculated from elemental analysis of a surface by SEM-EDX measurement is 0.6 mass % or lower, and a thickness is less than 100 nm.

2. The carbon transfer film according to claim 1 , wherein the sp 3 -bonded carbon is carbon derived from diamond.

3. The carbon transfer film according to claim 1 , wherein the sp 2 -bonded carbon is carbon derived from diamond.

4. A sliding member comprising:
a substrate, and
a carbon transfer film provided on at least one surface of the substrate,
wherein the carbon transfer film comprises sp 2 -bonded carbon and sp 3 -bonded carbon, and has a thickness of less than 100 nm,
a ratio of the sp 3 -bonded carbon to a sum of the sp 2 -bonded carbon and the sp 3 -bonded carbon, sp 3 /(sp 2 +sp 3 ), is from 0.01 to 0.2, and
a ratio of zirconium calculated from elemental analysis of the carbon transfer film surface by SEM-EDX measurement is 0.6 mass % or lower.

5. The sliding member according to claim 4 , wherein the carbon transfer film comprises a component derived from the substrate.

6. A lubricant composition comprising:
an organic dispersion medium as a lubricant base, and
nanodiamond particles nanodispersed in the organic dispersion medium,
wherein a content ratio of zirconia is lower than 100 mass ppm, and
the nanodiamond particles are surface-modified nanodiamond particles that are surface-modified with a group represented by Formula (1):
—X—R 1   (1)

where in Formula (1), X represents —NH—, —O—, —O—C(═O)—, —C(═O)—O—, —NH—C(═O)—, —C(═O)—NH—, or —S—; and a bond extending left from X is bonded to a nanodiamond particle; R 1 represents a monovalent organic group, and an atom bonded to X is a carbon atom; and in Formula (1), a molar ratio of carbon atoms to a total amount of heteroatoms selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, and silicon atoms is 4.5 or higher.

7. A lubricant composition comprising:
an organic dispersion medium as a lubricant base, and
surface-modified nanodiamond particles nanodispersed in the organic dispersion medium, the surface-modified nanodiamond particles being surface-modified with a group represented by Formula (1):
—X—R 1   (1)

where in Formula (1), X represents —NH—, —O—, —O—C(═O)—, —C(═O)—O—, —NH—C(═O)—, —C(═O)—NH—, or —S—; a bond extending left from X is bonded to a nanodiamond particle; le represents a monovalent organic group, and an atom bonded to X is a carbon atom; and in Formula (1), a molar ratio of carbon atoms to a total amount of heteroatoms selected from the group consisting of nitrogen atoms, oxygen atoms, sulfur atoms, and silicon atoms is 4.5 or higher.

8. The lubricant composition according to claim 6 , wherein the R 1 is a monovalent organic group comprising no hydroxy group, carboxy group, amino group, mono-substituted amino group, terminal alkenyl group, or terminal epoxy group.

9. The lubricant composition according to claim 6 , wherein the organic dispersion medium as a lubricant base is one or more selected from the group consisting of a polyol ester, a poly(α-olefin), a mineral oil, an alkylbenzene, and a polyalkylene glycol.

10. The lubricant composition according to claim 6 , wherein a content ratio of the nanodiamond particles is from 0.01 to 5.0 mass %, and an average dispersed particle size of the nanodiamond particles in the lubricant composition is from 2 to 50 nm.

11. The lubricant composition according to claim 6 , wherein a content ratio of the nanodiamond particles is from 0.1 to 2000 mass ppm, and an average dispersed particle size of the nanodiamond particles in the lubricant composition is from 5 to 100 nm.

12. A method of manufacturing a sliding member comprising a substrate and a carbon transfer film provided on a surface of the substrate, the method comprising:
relatively sliding a sliding surface of the substrate and a sliding surface of a member for sliding in the presence of the lubricant composition described in claim 6 to transfer carbon derived from the nanodiamond particles in the lubricant composition onto the substrate to form the carbon transfer film.

13. The method of manufacturing a sliding member according to claim 12 , wherein, further, a component in the substrate is transferred onto the substrate by the sliding to form the carbon transfer film.

14. The method of manufacturing a sliding member according to claim 12 , wherein the member for sliding is a metal material.

15. The method of manufacturing a sliding member according to claim 14 , wherein the sliding is performed under boundary lubrication conditions.

16. A piston comprising the carbon transfer film described in claim 1 in a sliding region relative to a cylinder.

17. A cylinder comprising the carbon transfer film described in claim 1 in a sliding region relative to a piston.

Assignees

• Daicel Corp

Inventors

• Ihara Ryosuke

Classifications

• C10M125/02 Primary

  Carbon; Graphite · CPC title

• C10M171/06

  Particles of special shape or size · CPC title

• C10M2201/041

  Carbon; Graphite; Carbon black · CPC title

• C10N2050/08

  Solids · CPC title

• C10M159/12 Primary

  Reaction products · CPC title