Superlubrious high temperature coatings
AssigneeUchicago Argonne, LLC
InventorsAnirudha V. Sumant, Venkata Aditya Ayyagari
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Abstract
A low friction wear surface operable at high temperatures and high loads with a coefficient of friction in the superlubric regime including MoS2 and graphene-oxide on the wear surface is provided, and methods of producing the low friction wear surface are also provided. The low friction wear surface remains with a coefficient of friction in the superlubric regime at temperatures in between about 200° C. and 400° C.
Claims20
A method of forming a low friction wear surface comprising:
- suspending graphene-oxide in a solvent to form a solution of at least 1 g/L;
- adding at least 1 g/L of MoS2 ultrafine nanocrystalline flakes to the solution;
- sonicating the MoS2 and the solution to form a homogenous solution;
- and
- disposing the homogeneous solution by:
- spraying the homogeneous solution on a substrate via a process of air-spray coating, wherein the substrate has a temperature at about 275° C.;
- forming a wet film on the substrate;
- and
- evaporating the solvent component to form a dry coating layer;
- wherein the graphene oxide and the MoS2 are in a range of ratios of 8:10 to 10:8 by weight.
A low friction wear surface comprising:
- a substrate;
- graphene-oxide in an oil-free solvent disposed over the substrate;
- and
- MoS2 ultrafine nanocrystalline flakes disposed over the substrate;
- wherein the graphene-oxide and the MoS2 are in a range of ratios of (1±0.25):(1∓0.25) by weight, respectively.
A method of forming a sliding mechanical system with a low friction wear surface comprising:
- forming a homogeneous solution comprising MoS2 and graphene-oxide in a range of ratios in between 0.75:1.25 and 1.25:0.75;
- disposing over a substrate, the homogeneous solution to form a first sliding component;
- and
- sliding the first sliding component against a second sliding component in ambient air;
- wherein scrolls of MoS2 are formed and encapsulated in the graphene-oxide.
Dependencies are inferred from the claim text.