Patent ID: 11966198
Assignee: NIVAROX-FAR S.A.
Field: Materials, metallurgy (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A spiral spring comprising a niobium-based alloy consisting of:
niobium: balance to 100 wt %;
titanium: from 40 wt % to 49 wt %; and
traces of elements selected from the group consisting of O, H, C, Fe, Ta, N, Ni, Si, Cu, and Al, wherein each of the elements is present in an amount between 0 ppm and 1600 ppm by weight, and the total amount representing all of the elements is between 0 wt % and 0.3 wt %,
wherein the titanium is essentially in the form of a solid solution with the niobium in β phase, and the content of titanium in a phase is 5 vol % or less,
the niobium-based alloy has an elastic limit of at least 600 MPa and an elastic modulus of less than 100 GPa, and
the spiral spring does not comprise a surface layer of a ductile material selected from the group consisting of copper, nickel, cupro-nickel, cupro-manganese, gold, silver, nickel phosphorus Ni—P and nickel-boron Ni—B.