METHOD OF MANUFACTURING GAS TURBINE ENGINE ELEMENT HAVING AT LEAST ONE ELONGATED OPENING

摘要

A method is disclosed of manufacturing a gas turbine engine element, for example a shroud segment (20). An insert (56) has at least one elongated feature (60) received in a mold cavity (22'). A powder injection molding feedstock is injected. When the green part is disengaged from the mold (22'), each elongated feature (60) is slid out of the green part to define a respective elongated passage. The cross-sectional dimension of the elongated feature (60) may be 0.020 inches (0.508 mm) or less, and/or a ratio between the length and cross-sectional dimension of the elongated feature may be at least 25. The method may include, after debinding and sintering, projecting a coating material while defining an obstruction between source of coating material and the open end of each elongated feature with a shoulder (84) of the element to prevent the coating material from reaching the open end, followed by machining to remove at least a part of the shoulder (84).