摘要:
PROBLEM TO BE SOLVED: To provide a technique for encapsulating a prescribed atmosphere in a space formed by being surrounded in the contour with a joint part between the joining faces of two substrates thereby surely shielding the space from the outside atmosphere. SOLUTION: The outer peripheral joint parts 831b formed in a lid substrate 807 and a device substrate 808 are pressurized and temporarily joined to each other, so that a prescribed atmosphere can be encapsulated in the space surrounded with the outer peripheral joint parts 831b between the joining faces of both substrates 807, 808. Regular joining therefore can be surely performed between the inner joint parts 831a of the respective substrates 807, 808 by pressurizing the inner joint parts in the prescribed atmosphere inside the space. Consequently, the prescribed atmosphere is encapsulated in the space formed by being surrounded in the contour with the inner joint parts 831a between the joining faces of the respective substrates 807, 808 and simultaneously this space can be surely shielded from the outside atmosphere. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
Large gas turbine blades made from separate cast segments of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specified tolerances. The turbine blade segments are then joined by transient liquid phase bonding, followed by a controlled heat treatment which produces the desired microstructure in the bond region. The method allows for the production of large, high quality turbine blades by joining small, high quality cast superalloy sections, in comparison with prior attempts to cast large turbine blades as single pieces which have produced very low yields and high individual component costs.