Metal treatment – Stock – Vanadium – niobum – or tantalum base
Reexamination Certificate
2005-07-05
2005-07-05
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Vanadium, niobum, or tantalum base
C420S426000
Reexamination Certificate
active
06913655
ABSTRACT:
A niobium-silicide refractory metal intermetallic composite adapted for use in a turbine component. The niobium-silicide refractory metal intermetallic composite comprises: 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. The niobium silicide refractory intermetallic composite contains a tetragonal phase, which comprises a volume fraction from 0.35 to 0.5 of the niobium silicide refractory intermetallic composite, and a hexagonal M3Si5silicide phase (wherein M is at least one of Nb and Hf) which comprises a volume fraction comprises less than 0.25 of the niobium silicide refractory intermetallic composite. A ratio of the sum of atomic percentages of niobium and tantalum present in said niobium silicide refractory intermetallic composite to the sum of atomic percentages of titanium and of hafnium present in said niobium silicide refractory intermetallic composite has a value from 1.5 to 2.0.
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Bewlay Bernard Patrick
Jackson Melvin Robert
Zhao Ji-Cheng
Clarke Penny A.
Ip Sikyin
Patnode Patrick K.
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