Patent ID: 6565990
Filing Date: 2003-05-20
Classification: B23K,F01D,F05D,Y02T,Y10S,Y10T

Abstract:
An article having a bulk melting temperature of at least about 1500Â° C., said article comprising:a) a first piece comprising one of a first niobium-based refractory metal intermetallic composite and a first molybdenum-based refractory metal intermetallic composite, wherein said first niobium-based refractory metal intermetallic composite comprises titanium, hafnium, silicon, chromium, and niobium, and said first molybdenum-based refractory metal intermetallic composite comprises molybdenum, silicon, and at least one of chromium and boron; and b) a second piece joined at a local bonded region to said first piece by a diffusion bond, said second piece comprising one of a second niobium-based refractory metal intermetallic composite and a second molybdenum-based refractory metal intermetallic composite, wherein said second niobium-based refractory metal intermetallic composite comprises titanium, hafnium, silicon, chromium, and niobium, and said second molybdenum-based refractory metal intermetallic composite comprises molybdenum, silicon, and at least one of chromium and boron, wherein said diffusion bond is formed from a first metallic element disposed on a first surface of said first piece and a second metallic element disposed on at least one of said first surface and a second surface of said second piece, said second surface contacting said first surface, wherein said first metallic element and said second metallic element form a composition having a melting temperature less than about 1450Â° C., and wherein at least about 5 atomic percent of each of said first metallic element and said second metallic element are soluble in each of said first piece and said second piece.