Patent Number: 047073306
Section: claims

1. In a nuclear reactor having metallic components, the improvement wherein at least one metallic component is a composite metallic component, said composite metallic component comprising a member formed from 90-60 volume percent of a metal matrix of a metal selected from the group consisting essentially of zirconium and a zirconium alloy containing less than about 5 percent by weight of an alloying element, said metal matrix having homogeneously incorporated, throughout said matrix, 10-40 volume percent of silicon carbide whiskers. 2. A composite metallic component as defined in claim 1 wherein said silicon carbide whiskers have a length of between about 50 to 100 microns. 3. A composite metallic component as defined in claim 2 wherein said silicon carbide whiskers are of a diameter of about 0.5 microns. 4. A composite metallic component as defined in claim 1 wherein said zirconium metal matrix consists essentially of zirconium metal. 5. A composite metallic component as defined in claim 1 wherein said zirconium metal matrix consists essentially of a zirconium alloy. 6. A composite metallic component as defined in claim 5 wherein said zirconium alloy contains at least one alloying element selected from the group consisting of niobium, oxygen, tin, iron, chromium, nickel, molybdenum, copper and vanadium. 7. A composite metallic component as defined in claim 6 wherein said zirconium alloy is Zircaloy-2. 8. A composite metallic component as defined in claim 6 wherein said zirconium alloy is Zircaloy-4. 9. A composite metallic component (for use in nuclear reactors) as defined in claim 1 wherein said component has, on a surface thereof, a layer of a zirconium material selected from the group consisting of zirconium or a zirconium alloy. 10. A composite metallic component (for use in nuclear reactors) as defined in claim 9 wherein a said layer is provided on both surfaces of said composite metallic component. 11. In a nuclear reactor containing metallic components including at least one of fuel cladding, control rods, rod guide thimbles, grids and channels, the improvement wherein said at least one of said metallic components is formed from a metallic composite comprising 90-60 volume percent of a metal matrix of a metal selected from the group consisting essentially of zirconium and a zirconium alloy containing less than about 5 percent by weight of an alloying element, said metal matrix having homogeneously incorporated, throughout said matrix, 10-40 percent by volume of silicon carbide whiskers. 12. In the nuclear reactor defined in claim 11, the improvement wherein said at least one metallic component are a plurality of fuel claddings. 13. In the nuclear reactor defined in claim 11, the improvement wherein said at least one metallic component are a plurality of control rods. 14. In the nuclear reactor defined in claim 11, the improvement wherein said at least one metallic component are a plurality of guide thimbles. 15. In the nuclear reactor defined in claim 11, the improvement wherein said at least one metallic component are a plurality of grids. 16. In the nuclear reactor defined in claim 11, the improvement wherein said at least one metallic component are a plurality of channels. 17. In the nuclear reactor defined in claim 11, the improvement wherein said silicon carbide whiskers have a length of between 50 to 100 microns. 18. In the nuclear reactor as defined in claim 17, the improvement wherein said silicon carbide whiskers are of a diameter of about 0.5 microns. 19. In the nuclear reactor as defined in claim 11, the improvement wherein said zirconium metal matrix is a zirconium alloy containing at least one alloying element selected from the group consisting of niobium, oxygen, tin, iron, chromium, nickel, molybdenum, copper and vanadium. 20. In a nuclear reactor as defined in claim 11, the improvement wherein a layer of a zirconium material selected from the group consisting of zirconium or a zirconium alloy is provided on a surface of said metallic composite. 21. In a nuclear reactor as defined in claim 20, the improvement wherein a layer of a zirconium material selected from the group consisting of zirconium or a zirconium alloy is provided on both surfaces of said metallic composite.