WIPO logo
Mobile | Deutsch | Español | Français | 日本語 | 한국어 | Português | Русский | 中文 | العربية |
PATENTSCOPE

Search International and National Patent Collections
World Intellectual Property Organization
Search
 
Browse
 
Translate
 
Options
 
News
 
Login
 
Help
 
maximize
Machine translation
4. (WO2012166604) SURFACE CONDITIONING NANOLUBRICANT
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

What is claimed is:

1. A nanolubricant composition for polishing a surface having an arithmetic average roughness, the composition comprising:

a flowable lubricant; and

nanoparticles dispersed in the lubricant and configured to polish the surface, the nanoparticles having a hardness of at least about 7 Mohs and a diameter that is less than one half the arithmetic average roughness or a length that is less than one half of the arithmetic average roughness.

2. The nanolubricant composition of claim 1 wherein the nanoparticles are selected from the group consisting of diamond, aluminum oxide, silicon oxide, boron carbide, silicon carbide and zirconium oxide.

3. The nanolubricant composition of claim 1 further comprising molybdenum disulfide nanoparticles to effect shearing at the surface.

4. The nanolubricant composition of claim 1 wherein the nanoparticles have an average diameter of less than about 35 nm.

5. The nanolubricant composition of claim 1 wherein the nanoparticles have an average length of less than about 35 nm.

6. The nanolubricant composition of claim 1 wherein the flowable lubricant has a viscosity from about 10 to about 300 centistokes.

7. The nanolubricant composition of claim 1 wherein the base oil for a grease has a viscosity from about 200 to about 500 centistokes.

8. The nanolubricant composition of claim 1 wherein the nanolubricant comprises from about 0.1 to about 5 weight percent nanoparticles in the composition consisting essentially the nanoparticles having a hardness of at least 7 Mohs.

9. A nanolubricant composition for polishing a surface having an arithmetic average roughness, the composition comprising:

a flowable lubricant; and

a multi-component nanoparticle dispersed in the lubricant and configured to polish the surface, the multi-component nanoparticle including a first nanoparticle component which effects shearing at the surface and a second nanoparticle which effects polishing of the surface, the second nanoparticle component at least partially integrated with the first nanoparticle component, the second nanoparticle component having a hardness of at least about 7 Mohs (equivalent to 820 kg/ mm2 in Knoop scale).

10. The nanolubricant composition of claim 9 wherein the second nanoparticle component has a diameter that is less than one half the arithmetic average roughness or a length that is less than one half of the arithmetic average roughness.

11. The nanolubricant composition of claim 9 wherein the second nanoparticle component at least partially coats the first nanoparticle component.

12. The nanolubricant composition of claim 11 wherein the second nanoparticle component completely coats the first nanoparticle component.

13. The nanolubricant composition of claim 9 wherein the second nanoparticle component is at least partially embedded into the first nanoparticle component.

14. The nanolubricant composition of claim 9 wherein the second nanoparticle component is selected from the group consisting of diamond, aluminum oxide, silicon oxide, boron carbide, silicon carbide and zirconium oxide.

15. The nanolubricant composition of claim 9 wherein the first nanoparticle component is selected from the group consisting of molybdenum disulfide, tungsten disulfide, boron nitride and graphite.

16. The nanolubricant composition of claim 9 wherein the second nanoparticle component has a diameter of less than about 35 nm.

17. The nanolubricant composition of claim 9 wherein the second nanoparticle component has a length of less than about 35 nm.

18. The nanolubricant composition of claim 9 wherein the flowable lubricant has a viscosity from about 10 to about 300 centistokes.

19. The nanolubricant composition of claim 9 wherein the flowable lubricant has a viscosity from about 200 to about 500 centistokes.

20. A method of in-situ nanopolishing a contact surface having an arithmetic average roughness, the method comprising the steps of:

providing a nanolubricant including a flowable lubricant and nanoparticles, the nanoparticles dispersed in the lubricant and configured to polish the surface, the nanoparticles having a hardness of at least about 7 Mohs (equivalent to 820 kg/ mm2 in Knoop scale) and a diameter that is less than one half the arithmetic average roughness or a length that is less than one half of the arithmetic average roughness; and

polishing the contact surface using the nanolubricant to increase the ratio of a film thickness of the nanolubricant at the surface to the composite roughness.