Abstract:
An article (104;140) has an airfoil (100). The airfoil has a leading edge (114), a trailing (116) edge, a pressure side (118), and a suction side (120) and the airfoil extends from a first end (110) to a tip (112). The article comprises an aluminum alloy or titanium alloy substrate (352) and a coating at the tip. The coating comprises a cold sprayed nickel or cobalt matrix (352) and an abrasive (354).
Abstract:
A method for fabricating a metal foam component from an aerogel containing a polymer and nanoparticles is disclosed. The method may comprise: 1) exposing the aerogel to a reducing condition at an elevated temperature for a reaction time to provide a metal foam; and 2) using the metal foam to fabricate the metal foam component. At least one of the elevated temperature and the reaction time may be selected so that at least some ligaments of the metal foam have a desired ligament diameter or at least some pores of the metal foam have a desired pore size.. The desired ligament diameter may be less than about one micron and the component may be a component of a gas turbine engine.
Abstract:
Component (1) for a turbomachine and method for construction thereof, where the component comprises an inner core (6) and a first thermal bond coating (11) arranged on the inner core (6), and a second thermal bond coating (12) arranged on the first thermal bond coating (11). The first thermal bond coating (11) is sandwiched between the inner core (6) and the second thermal bond coating (12). A second operating temperature (T 2 max) of the second thermal bond coating (12) is higher than the first operating temperature (T 1 max) of the first thermal bond coating (11).
Abstract:
Impellers made of composite materials with flow path cavities covered by an erosion resistant coating (20) are manufactured by covering removable molds (10) having shapes corresponding to a negative geometry of the flow path cavities, with the erosion resistant coating using plating or thermal spraying. After shaping and curing a composite material (40) around the molds (10) covered with the erosion resistant coating (20), the molds are removed, while the erosion resistant coating remains on the composite impeller.
Abstract:
Impellers made of composite materials with flow path cavities covered by an erosion resistant coating are manufactured by covering removable molds having shapes corresponding to a negative geometry of the flow path cavities, with the erosion resistant coating using plating or thermal spraying. After shaping and curing a composite material around the molds covered with the erosion resistant coating, the molds are removed, while the erosion resistant coating remains on the composite impeller.
Abstract:
A turbine rotor shaft assembly (16) and associated turbocharger (10) that includes at least one turbine rotor member (17) having a first face (42) and an opposed second face (44); and a rotor shaft (18) having a first end (49) and an opposed second end (48) distal from the first end (49), wherein the rotor shaft (18) is connected to the at least one turbine rotor (17) at a location proximate to the first end (49) and projects outward therefrom, the rotor shaft (18) having an outwardly oriented surface (36) and an interior chamber (38) defined therein, the interior chamber (38) having an interior chamber volume. The rotor shaft (18) also includes at least one thermal transfer material (56) contained in the interior chamber (38) of the rotor shaft (18) that has a thermal conductivity value that is greater than the thermal conductivity value of the material of construction of the rotor shaft (18).
Abstract:
Method (100) for preventing corrosion in a component (1) of a turbo-machine having a metal substrate (5) made of carbon steel, low alloy steel and stainless steel includes: -a first deposition step (110) of depositing a first metallic layer (2a) on the substrate (5) by electroplating; -a second deposition step (120) of depositing at least a second layer (2b) of a nickel alloy on the first layer (2a) by electroless plating; -at least one thermal treatment (140) step after the deposition steps (110, 120), said thermal treatment (140) being applied at a temperature (T) and for a time (t) depending on the overall thickness of the layers (2a, 2b), the value of said temperature (T) being directly proportional to the thickness, the value of said time (t) being inversely proportional to the temperature (T).