Initial running-in agent composition and initial running-in system including said composition

Patent metadata

Field	Value
Publication number	US-11124735-B2
Application number	US-201816762550-A
Country	US
Kind code	B2
Filing date	Oct 25, 2018
Priority date	Nov 9, 2017
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

The present invention provides an initial running-in agent composition suitable for forming a low-friction surface (running-in surface) on a sliding member, such as a hard carbon film, in a system in which water is used as a lubricant. The initial running-in agent composition (10) according to an embodiment of the present invention contains water 11 as a lubricant base and nanodiamond particles (12). In the initial running-in agent composition (10), a content of the water (11) is preferably 99 mass % or greater, and a content of the nanodiamond particles (12) is preferably 1.0 mass % or less.

First claim

The invention claimed is:

1. An initial running-in system comprising:
an initial running-in agent composition containing water as a lubricant base; and nanodiamond particles; and
a member having a sliding surface.

2. The initial running-in system according to claim 1 , wherein a content of the water is 99 mass % or greater, and a content of the nanodiamond particles is 1.0 mass % or less.

3. The initial running-in system according to claim 1 , wherein the content of the nanodiamond particles is from 0.5 to 2000 ppm by mass.

4. The initial running-in system according to claim 1 , wherein the nanodiamond particles are an oxygen oxidation product of detonation nanodiamond particles.

5. The initial running-in system according to claim 1 , wherein a zeta potential of the nanodiamond particles is negative.

6. The initial running-in system according to claim 1 , wherein a peak position attributed to C═O stretching vibration in FT-IR of the nanodiamond particles is 1750 cm −1 or greater.

7. The initial running-in system according to claim 1 , wherein the nanodiamond particles are a hydrogen reduction product of detonation nanodiamond particles.

8. The initial running-in system according to claim 1 , wherein the zeta potential of the nanodiamond particles is positive.

9. The initial running-in system according to claim 1 , wherein the peak position attributed to C═O stretching vibration in FT-IR of the nanodiamond particles is less than 1750 cm −1 .

10. The initial running-in system according to claim 1 , wherein the composition is used for lubricating the member having a sliding surface comprises.

11. An initial running-in system according to claim 1 wherein the member having a sliding surface comprises a a diamond-like-carbon (DLC) member.

12. The initial running-in system according to claim 1 , wherein a particle size of primary particles of the nanodiamond particles is 10 nm or less.

13. The initial running-in system according to claim 5 , wherein the zeta potential of the nanodiamond particles is from −60 to −30 mV.

14. The initial running-in system according to claim 8 , wherein the zeta potential of the nanodiamond particles is from 30 to 60 mV.

15. The initial running-in system according to claim 1 , wherein the nanodiamond particles are dispersed as primary particles separated from each other in the initial running-in agent composition.

16. The initial running-in system according to claim 1 , wherein the nanodiamond particles comprise detonation nanodiamond particles.

17. The initial running-in system according to claim 1 , wherein the particle size of the primary particles of the nanodiamond particles is 1 nm or greater.

18. The initial running-in system according to claim 1 , wherein
the nanodiamond particles are dispersed as primary particles separated from each other in the initial running-in agent composition,
the particle size of the primary particles of the nanodiamond particles is 1 nm or greater and 10 nm or less,
the nanodiamond particles are an oxygen oxidation product of detonation nanodiamond particles,
the zeta potential of the nanodiamond particles is from −60 to −30 mV,
the peak position attributed to C═O stretching vibration in FT-IR of the nanodiamond particles is 1750 cm −1 or greater, and
the content of the water is 99 mass % or greater, and the content of the nanodiamond particles is from 0.5 to 2000 ppm by mass.

19. The initial running-in system according to claim 1 , wherein
the nanodiamond particles are dispersed as primary particles separated from each other in the initial running-in agent composition,
the particle size of the primary particles of the nanodiamond particles is 1 nm or greater and 10 nm or less,
the nanodiamond particles are a hydrogen reduction product of detonation nanodiamond particles,
the zeta potential of the nanodiamond particles is from 30 to 60 mV,
the peak position attributed to C═O stretching vibration in FT-IR of the nanodiamond particles is less than 1750 cm −1 , and
the content of the water is 99 mass % or greater, and the content of the nanodiamond particles is from 0.5 to 2000 ppm by mass.

20. The initial running-in system according to claim 11 , wherein DLC in the DLC member is at least one selected from the group consisting of amorphous hydrogenated carbon (a-C:H), amorphous carbon (a-C), tetrahedral amorphous carbon (ta-C:H), and hydrogenated tetrahedral amorphous carbon (ta-C).

Assignees

• Daicel Corp
• Univ Tohoku

Inventors

• Kimoto Norihiro
• Goto Tomohiro
• Adachi Koshi
• Takahashi Tsubasa

Classifications

• C10M173/02 Primary

  not containing mineral or fatty oils · CPC title

• C10N2050/023

  Multi-layer lubricant coatings · CPC title

• C10N2050/015

  Dispersions of solid lubricants · CPC title

• C10N2040/10

  Running-in-oil {; Grinding} · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title