Nonevaporable getter alloys
AssigneeSaes Getters S.P.A.
InventorsClaudio Boffito, Alessio Corazza, Stefano Tominetti
Life of this patent
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Abstract
Nonevaporable getter alloys containing Zr, Co, and a third component A selected from the rare each metals and mixtures thereof, e.g., mischmetal. A most preferred alloy contains about 80.8 wt % Zr, about 14.2 wt % Co, and about 5 wt % A. These alloys are advantageous because they are suitable for general use, i.e., they have a relatively low activation temperature, are capable of sorbing a wide variety of gases, and minimize the environmental and safety risks associated with known nonevaporable getter alloys.
Claims22
A nonevaporable getter alloy comprising zirconium, cobalt, and a third component A, said alloy having a composition, in terms of weight percentage, which when plotted on a ternary composition diagram falls within a polygon defined by the points:
- a) 81 wt % Zr, 9 wt % Co, and 10 wt % A;
- b) 68 wt % Zr, 22 wt % Co, and 10 wt % A;
- c) 74 wt % Zr, 24 wt % Co, and 2 wt % A;
- and
- d) 88 wt % Zr, 10 wt % Co, and 2 wt % A;
- where A is selected from the group consisting of rare earth metals, yttrium, lanthanum, and mixtures thereof, said nonevaporable getter alloy having a maximum combustion temperature in air that does not exceed about 740.degree. C.
A nonevaporable getter alloy consisting essentially of zirconium, cobalt, and a third component A, said alloy having a composition, in terms of weight percentage, which when plotted on a ternary composition diagram falls within a polygon defined by the points:
- a) 81 wt % Zr, 9 wt % Co, and 10 wt % A;
- b) 68 wt % Zr, 22 wt % Co, and 10 wt % A;
- c) 74 wt % Zr, 24 wt % Co, and 10 wt % A;
- and
- d) 88 wt % Zr, 10 wt % Co, and 10 wt % A;
- where A is selected from the group consisting of rare earth metals, yttrium, lanthanum, and mixtures thereof, said nonevaporable getter alloy having a maximum combustion temperature in air that does not exceed about 740.degree. C.
A nonevaporable getter alloy comprising about 80.8 wt % Zr, about 14.2 wt % Co, and about 5 wt % A, where A is selected from the group consisting of rare earth metals, yttrium, lanthanum, and mixtures thereof, said nonevaporable getter alloy having a maximum combustion temperature in air that does not exceed about 740.degree. C.
A nonevaporable getter alloy consisting essentially of about 80.8 wt % Zr, about 14.2 wt % Co, and about 5 wt % A, where A is selected from the group consisting of rare earth metals, yttrium, lanthanum, and mixtures thereof, said nonevaporable getter alloy having a maximum combustion temperature in air that does not exceed about 740.degree. C.
Dependencies are inferred from the claim text.