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

Patent metadata

Field	Value
Publication number	US-2020339908-A1
Application number	US-201816762550-A
Country	US
Kind code	A1
Filing date	Oct 25, 2018
Priority date	Nov 9, 2017
Publication date	Oct 29, 2020
Grant date	—

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

1 . An initial running-in agent composition containing water as a lubricant base and nanodiamond particles.

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

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

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

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

9 . The initial running-in agent composition 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 agent composition according to claim 1 , wherein the composition is used for lubricating a DLC member.

11 . An initial running-in system comprising the initial running-in agent composition described in claim 1 and a DLC member.

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

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

15 . The initial running-in agent composition 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 agent composition according to claim 1 , wherein the nanodiamond particles comprise detonation nanodiamond particles.

17 . The initial running-in agent composition 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 agent composition 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 agent composition 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