Low friction coatings
AssigneesJohn Crane Inc., Uchicago Argonne, LLC
InventorsAnirudha V. Sumant, Kalyan C. Mutyala, Jiao Yang, Jorge Pacheco, Klaus Meck
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Abstract
A dry gas seal assembly for use with a rotating machine that includes a rotating shaft, the seal assembly comprises a seal face bears a solid coating comprising molybdenum disulfide, graphene oxide, and optionally polydopamine, preferably wherein the graphene oxide to molybdenum disulfide ratio is 8:10 to 10:8. A method for making a dry gas seal assembly comprises coating a homogeneous dispersion of graphene oxide and molybdenum disulfide on a seal face.
Claims20
A method of forming a low friction, wear-resistant seal assembly comprising:
- providing seal assembly components comprising a seal face substrate;
- suspending molybdenum disulfide flakes which have a dimension perpendicular to thickness in the range of about 300 to about 500 nanometers;
- in a carrier liquid to form a mixture;
- adding graphene oxide flakes to the mixture;
- forming a homogenous mixture of molybdenum disulfide and graphene oxide, and, a functionalizing agent to improve adhesion or the graphene oxide and molybdenum disulfide to the seal face substrate, wherein a weight ratio of the graphene oxide to the molybdenum disulfide is from 8:10 to 10:8 and depositing the homogeneous mixture on a portion or all of the seal face substrate, forming a wet film on the seal face substrate, and evaporating the carrier liquid to form a dry coating layer.
A dry gas seal assembly for use with a rotating machine that includes a rotating shaft, the seal assembly comprising:
- a mating ring having a mating ring seal face;
- a primary ring having a primary ring seal face;
- where the mating ring and primary ring are positioned such that the mating ring seal face and the primary ring seal face are adjacent and facing each other;
- a first biasing member that urges the primary ring seal face toward the mating ring seal face;
- wherein at least one of the mating ring seal face and the primary ring seal faces includes recesses formed thereon that cause a gas to be drawn between the mating ring and the primary ring due to relative rotation between the primary ring and the mating ring and form a gas layer between the mating ring and the primary ring that urges the primary ring away from the mating ring wherein the at least one of the mating ring seal face and the primary ring seal face bears a solid coating comprising molybdenum disulfide, graphene oxide, and optionally poly dopamine wherein the molybdenum disulfide is in the form of flakes which have a dimension perpendicular to thickness in the range of about 300 to about 500 nanometers and wherein a weight ratio of the graphene oxide to the molybdenum disulfide is from 8:10 to 10:8.
Dependencies are inferred from the claim text.