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US 11,440,049 B2Granted
Low friction coatings
AssigneeUchicago Argonne, LLC
InventorsAnirudha V. Sumant, Venkata Aditya Ayyagari
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Abstract
A low friction, wear-resistant surface operable at high temperatures and high loads with a low coefficient of friction including boron nitride and graphene-oxide on steel or nanodiamonds and graphene on aluminum. The low friction, wear-resistant surface remains with a coefficient of friction in the superlubric regime at temperatures in between about 200° C. and 970° C.
Claims16
A method comprising:
- preparing graphene-oxide by chemical exfoliation of polycrystalline graphite or highly-oriented pyrolytic graphite;
- suspending the prepared graphene-oxide in a solvent to form a mixture of at least 50 mg/L;
- adding at least 50 mg/L of boron nitride to the mixture;
- adding a functionalizer comprising polydopamine (“PDA”);
- sonicating the mixture to form a homogenous mixture;
- and
- disposing the homogeneous mixture by:
- spraying the homogeneous mixture on a substrate via a process of air-spray coating, wherein the substrate has a temperature of at least 110° C.,
- forming a wet film on the substrate, and
- evaporating the solvent to form a dry coating layer, the dry coating layer reducing the friction of the substrate by greater than or equal to 50%.
7 more elements
A method comprising:
- preparing a functionalizer solution comprising polydopamine;
- forming a solid lubricant mixture;
- sonicating the solid lubricant mixture to form a homogenous mixture;
- adding the functionalizer solution to the homogenous mixture, forming a liquid spray mixture;
- and
- disposing the liquid spray mixture by:
- spraying the liquid spray mixture on a substrate via a process of air-spray coating,
- forming a wet film on the substrate, and
- evaporating the solvent component to form a dry coating layer, the dry coating layer reducing the friction of the substrate by greater than or equal to 50%;
- wherein the dry coating layer comprises polydopamine and the solid lubricant.
7 more elements
Dependencies are inferred from the claim text.