Patent ID: 6913655

Claim:
A turbine component formed from a niobium silicide refractory intermetallic composite, said niobium silicide refractory intermetallic composite comprising: between about 19 atomic percent and about 24 atomic percent titanium; between about 1 atomic percent and about 5 atomic percent hafnium; between about 16 atomic percent and about 22 atomic percent silicon; between about 7 atomic percent and about 14 atomic percent chromium; from about 1.5 atomic percent to about 3 atomic percent tin; and a balance of niobium, wherein said niobium silicide refractory intermetallic composite contains a tetragonal phase, said tetragonal phase comprising a volume fraction from 0.35 to 0.5 of said niobium silicide refractory intermetallic composite, and a hexagonal M 5 Si 3 silicide phase, wherein M is at least one of Nb and Hf and wherein said hexagonal M 5 Si 3 silicide phase comprises a volume fraction of less than 0.25 of said niobium silicide refractory intermetallic composite, and wherein a ratio of a sum of atomic percentages of niobium and tantalum present in said niobium silicide refractory intermetallic composite to a sum of atomic percentages of titanium and hafnium present in said niobium silicide refractory intermetallic composite has a value from 1.5 to 2.0.