Abstract: A method is provided for providing oxidation protection and wear improvement for a densified carbon/carbon (C/C) friction disk. The method includes applying a first coating to a radially inward non-wear surface and a radially outward non-wear surface of the densified C/C friction disk and applying a second coating to the radially inward non-wear surface, the radially outward non-wear surface, and the wear surfaces of the densified C/C friction disk.

Abstract: A method for decreasing a wear rate at a core-liner interface between a core component and a wear liner component of a core-liner brake stack configuration and increasing the life of the core component is disclosed herein. The method includes coating a surface of a substrate with a ceramic solution, wherein the substrate is a first surface of the core component or a second non-wearing surface of the wear liner component, wherein the first surface of the core component and the second non-wearing surface of the wear liner component meet to form an interface between the core component and the wear liner component, drying the coated surface to produce oxide particulates within the substrate, forming a coated brake disk by coupling the wear liner component onto the core component, wherein the coated brake disk includes the coated surface, and installing the coated brake disk in a multi-disk brake system.

Abstract: A method for infiltrating a wear liner is disclosed herein. The method includes infiltrating a ceramic solution into a carbon/carbon (C/C) substrate, drying the C/C substrate to produce oxide particulates within the C/C substrate, and densifying the C/C substrate, including heating the C/C substrate and oxide particulates to a first temperature, wherein heating the C/C substrate during the densifying avoids promoting a reaction between the oxide particulates and the C/C substrate.

Abstract: A method for decreasing wear rate of a brake stack or a heat sink and increasing a brake life of the brake stack or the heat sink is disclosed herein. The method includes applying a thin film to a wear surface of a C/C substrate, the thin film including a ceramic tape, thereby forming a coated wear surface, wherein the ceramic tape comprises at least one of nano ceramic binary oxide particulates, doped nano ceramic binary oxide particulates, or nano ceramic ternary oxide particulates, heating the coated wear surface to bond the ceramic tape to the wear surface of the C/C substrate, and installing the coated wear surface of the C/C substrate to a multi-disk brake system.

Abstract: A pump assembly includes a cylinder block defining a piston bore therein extending in an axial direction. A sleeve lines the piston bore. A piston is included in the piston bore, configured to reciprocate along a stroke in the axial direction within the sleeve. A piston ring is engaged circumferentially about the piston. The piston ring is fixed to the piston and is slidingly engaged to an inner surface of the sleeve.

Abstract: In accordance with at least one aspect of this disclosure, a pump system for an aircraft includes, a cylinder barrel configured to rotate within a pump housing of a pump, and a plurality of pistons seated within a respective bore defined in the cylinder barrel. Each piston further includes a piston ring disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore. Each respective piston ring is of silicon nitride. In embodiments, the piston ring can include a chamfer on at least a leading edge of the piston ring. In embodiments, the piston ring can include a cut therethrough configured to allow for thermal expansion of the piston ring.

Abstract: In accordance with at least one aspect of this disclosure, a system includes, a cylinder barrel configured to rotate within a pump housing of a pump operatively connected to a driving member of the pump via a first shaft. A piston is seated within a bore defined in the cylinder barrel. The piston is operatively connected to the driving member of the pump via a second shaft. The first shaft and the second shaft each include a ball end configured to seat within the driving member. In embodiments, the ball end of at least the second shaft is of silicon nitride.

Abstract: In accordance with at least one aspect of this disclosure, a pump system for an aircraft includes, a cylinder barrel configured to rotate within a pump housing of a pump, and a plurality of pistons seated within a respective bore defined in the cylinder barrel. Each piston further includes a piston ring disposed at an end thereof configured to form a hydrodynamic seal with an inner surface of the respective bore. Each respective piston ring is of silicon nitride. In embodiments, the piston ring can include a chamfer on at least a leading edge of the piston ring. In embodiments, the piston ring can include a cut therethrough configured to allow for thermal expansion of the piston ring.

Abstract: In accordance with at least one aspect of this disclosure, a system includes, a cylinder barrel configured to rotate within a pump housing of a pump operatively connected to a driving member of the pump via a first shaft. A piston is seated within a bore defined in the cylinder barrel. The piston is operatively connected to the driving member of the pump via a second shaft. The first shaft and the second shaft each include a ball end configured to seat within the driving member. In embodiments, the ball end of at least the second shaft is of silicon nitride.

Abstract: In accordance with at least one aspect of this disclosure, a system comprises, a cylinder barrel configured to rotate within a pump housing. In embodiments, the cylinder barrel includes a main cylindrical body, a center recess defined within the main cylindrical body configured to seat a drive shaft therein, and a plurality of bores defined in the main cylindrical body, extending in an axial direction, wherein the plurality of bores are spaced apart circumferentially relative to one another about the main cylindrical body radially outward of the center recess. Each of the plurality of bores are configured to seat a respective piston therein and allow fluid flow therethrough. In embodiments, the main cylindrical body is of silicon nitride.