METHOD FOR JOINING HIGH TEMPERATURE MATERIALS AND ARTICLES MADE THEREWITH

摘要

Methods for joining dissimilar high-temperature alloys are provided, along with articles, such as turbine airfoils, formed by the method. The method comprises interposing a barrier material between a first segment and a second segment to form a segment assembly. The first segment comprises a titanium aluminide material, and the second segment comprises a nickel alloy. The barrier material comprises a primary constituent element present in the barrier material at a concentration of at least about 30 weight percent of the barrier material, and the primary constituent element is a transition metal element of Group 1B, Group 4B (excluding titanium and zirconium), Group 5B, Group 6B, Group 7B, or Group 8B (excluding nickel). The segment assembly is bonded in the solid state at a combination of temperature, pressure, and time effective to produce a metallurgical joint between the first and second segments, thereby forming an intermediate article; and the intermediate article is heat treated to form a bonded article.

主权项

1. A method comprising:
interposing a barrier material between a first segment and a second segment to form a segment assembly, wherein the first segment comprises a titanium aluminide material, the second segment comprises a nickel alloy, and the barrier material comprises a primary constituent element present in the barrier material at a concentration of at least about 30 weight percent of the barrier material; wherein the primary constituent element is a transition metal element of Group 1B, Group 4B (excluding titanium and zirconium), Group 5B, Group 6B, Group 7B, or Group 8B (excluding nickel); bonding the segment assembly in the solid state at a combination of temperature, pressure, and time effective to produce a metallurgical joint between the first and second segments, thereby forming an intermediate article; and heat treating the intermediate article to form a bonded article.