Anti-fretting wear coating for substrates

Patent metadata

Field	Value
Publication number	US-9228145-B2
Application number	US-201213475616-A
Country	US
Kind code	B2
Filing date	May 18, 2012
Priority date	May 20, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A method and chemical composition and material structure for improving fretting wear in substrates, particularly carbon-carbon composite (CCC). The invention relates to trilayer coatings, comprising a base of hard ZrO 2 , a middle layer of Al 2 O 3 , and a top layer of lubricious ZnO. The coatings of the present invention exhibit conformality and pore-filling down to approximately 100 microns into a carbon-carbon composite to which they are applied. The methods for preparing the coatings include a chemical vapor infiltration route, such as an atomic layer deposition (ALD) process, to uniformly and conformally coat the porous and open structure of CCC with a solid lubricant trilayer of ZnO/Al 2 O 3 /ZrO 2 that results in significant improvement (65%) in fretting wear.

First claim

What is claimed:

1. A substrate coated with a composition comprising an underlayer of zirconium oxide, a second layer of aluminum oxide, and a top layer of zinc oxide, wherein the underlayer, the second layer, and the top layer form a trilayer coating that provides reduced friction and improved fretting wear to the substrate.

2. The substrate of claim 1 , wherein the substrate is carbon-carbon composite.

3. The substrate of claim 2 , wherein the composition coats the subsurface pores of the carbon-carbon composite down to approximately 100 μm in depth.

4. The substrate of claim 3 , wherein the composition coats the surface of the carbon-carbon composite at a thickness of approximately 250 nm.

5. The substrate of claim 2 , wherein the composition reduces fretting wear by 65% in coated carbon-carbon composite compared with uncoated carbon-carbon composite.

6. The substrate of claim 1 , wherein the composition exhibits self-lubricating behavior at ambient temperature or in higher temperature environments.

7. The coated carbon-carbon composite of claim 1 prepared by the method of:
a) applying tetrakis (dimethylamido) zirconium (IV) and DI water to a carbon-carbon composite to deposit a zirconium oxide underlayer;
b) applying trimethyl aluminum to the zirconium oxide underlayer of the carbon-carbon composite to deposit a second layer of aluminum oxide on the carbon-carbon composite; and
c) applying diethyl zinc and DI water to the second layer of aluminum oxide of the carbon-carbon composite to deposit a top layer of zinc oxide on the carbon-carbon composite, to produce the coated carbon-carbon composite.

8. A substrate coated with a composition comprising an underlayer of zirconium oxide, a second layer of aluminum oxide, and a top layer of zinc oxide, wherein the substrate is carbon-carbon composite.

9. A substrate coated with a composition comprising an underlayer of zirconium oxide, a second layer of aluminum oxide, and a top layer of zinc oxide, wherein the composition coats the surface of the carbon-carbon composite at a thickness of approximately 250 nm.

Assignees

• Scharf Thomas W
• Mohseni Hamidreza
• Tiley Jaimie S
• Univ North Texas

Inventors

• Scharf Thomas W
• Mohseni Hamidreza
• Tiley Jaimie S

Classifications

• C10M103/06 Primary

  Metal compounds · CPC title

• C10M7/00 Primary

  Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances (compositions in general essentially based on macromolecular compounds C08L) · CPC title

• C23C16/405

  of refractory metals or yttrium · CPC title

• C10N2030/06

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

• C10N2050/08

  Solids · CPC title