Abstract: A fluid gear pump gear arranged to rotate about a first axis. The fluid gear pump gear includes a concentrically disposed first hub portion and a plurality of first teeth radially projecting and circumferentially spaced about the first hub portion, the first hub portion and the first teeth being coated with a vapor-deposited of cavitation resistant coating. The gear also includes a first shaft on which the first hub portion is carried.

Abstract: A fluid gear pump gear arranged to rotate about a first axis includes a concentrically disposed first hub portion and a plurality of first teeth radially projecting and circumferentially spaced about the first hub portion, the first hub portion and the first teeth being formed of a ceramic material. The gear also includes a first shaft on which the first hub portion is carried.

Abstract: A method of increasing corrosion resistance without leveraging toxic hexavalent chromium uses partially oxidized graphene particles mixed into primer applied on metallic alloy surfaces. Graphene is effective as an anti-corrosion primer additive because it acts as a physical barrier and has electrochemical properties that change potentials needed to induce corrosion.

Abstract: An air bearing according to an example of the present disclosure includes a stationary member and a shaft with a flange configured to rotate with respect to the stationary member, and at least one of the flange and the shaft have a tungsten-carbide-based coating. An alternative air bearing and a method of making an air bearing are also disclosed.

Abstract: A laminar flow coating for aerodynamic surfaces is provided. The laminar flow coating may comprise a base composition, such as an epoxy composition, a fluoropolyurethane composition, or a polyurethane composition. A filler composition may be dispersed within the base composition. The filler composition may comprise at least one of a nanomaterial composition or a microfiller composition. The filler composition may be doped with a hydrophobic surface modifier prior to being dispersed within the base composition.

Abstract: A method for increasing corrosion resistance of metallic substrates without use of hexavalent chromium includes chemically treating the substrate to create an oxide layer, mixing nanoclay particles into a non-chromate primer, applying the primer to the oxide layer of the substrate, and applying a topcoat to the primer opposite the oxide layer.

Abstract: A method for increasing corrosion resistance of metallic substrates without use of hexavalent chromium includes chemically treating the substrate to create an oxide layer, mixing graphene nanoplatelets into a non-chromate epoxy-based primer, applying the primer to the oxide layer of the substrate, and applying a topcoat to the primer opposite the oxide layer.

Abstract: A bearing assembly is disclosed that includes a first component with a first bearing surface, and a second component with a second bearing surface. A fluid is disposed between the first bearing surface and the second bearing surface supporting the first bearing surface and the second bearing surface in a non-contact rotational relationship. The first bearing surface, or the second bearing surface, or both the first bearing surface and the second bearing surface include a surface layer with solid lubricant 2D nanoparticles in a matrix.

Abstract: A high temperature coating includes a silicone resin, a mass of nanoclay particles dispersed in the silicone resin, a surfactant and water.

Abstract: The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition comprising a first phosphate glass composition, with a primary flow modifier and a first carrier fluid, wherein the primary flow modifier comprises at least one of cellulose or calcium silicate; applying the first slurry on a surface of the composite structure to form a base layer; and heating the composite structure to a temperature sufficient to adhere the base layer to the composite structure.

Abstract: A method for coating a carbon fiber for a composite structure may comprise applying a slurry onto a surface of the carbon fiber, wherein the slurry is a sol gel comprising a metal precursor and a carrier fluid, and heating the carbon fiber to a temperature sufficient to form a sol gel-derived layer on the carbon fiber. The slurry may comprise a metal precursor such as a metal salt or a metal alkoxide.

Abstract: The method may include forming fibers with a silicon-based sizing, forming a fibrous preform from the fibers, forming a silicon dioxide coating around the fibers, carbonizing the fibrous preform, and densifying the fibrous preform. In various embodiments, forming the fibers with the silicon-based sizing includes utilizing a mass of the silicon-based sizing that is at least 1.0% of a mass of the fibers.

Abstract: The present disclosure provides a method for coating a composite structure, comprising applying a first slurry onto a surface of the composite structure, wherein the first slurry is a sol gel comprising a metal organic salt, a first carrier fluid, and a ceramic material, and heating the composite structure to a first sol gel temperature sufficient to form a sol gel-derived base layer on the composite structure.

Abstract: The present disclosure provides a method for coating a composite structure, comprising applying a single pretreating composition on a surface of the composite structure, the single pretreating composition comprising a first acid aluminum phosphate comprising a molar ratio of aluminum to phosphate between 1 to 2 and 1 to 3, and heating the composite structure to a first temperature sufficient to form an aluminum phosphate polymer layer on the composite structure.

Abstract: The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition with a first carrier fluid, applying the first slurry on a surface of the composite structure, and heating the composite structure to a temperature sufficient to form a base layer on the composite structure. The first pre-slurry composition may comprise a first phosphate glass composition and a low coefficient of thermal expansion material, wherein the low coefficient of thermal expansion material is a material with a coefficient of thermal expansion of less than 10×10?6° C.?1.