Zirconium alloys are solid solutions of zirconium or other metals, a common subgroup having the trade mark Zircaloy. Zirconium has very low absorption cross-section of thermal neutrons, high hardness, ductility and corrosion resistance. One of the main uses of zirconium alloys is in nuclear technology, as cladding of fuel rods in nuclear reactors, especially water reactors. A typical composition of nuclear-grade zirconium alloys is more than 95 weight percent zirconium and less than 2% of tin, niobium, iron, chromium, nickel and other metals, which are added to improve mechanical properties and corrosion resistance.
The water cooling of reactor zirconium alloys elevates requirement for their resistance to oxidation-related nodular corrosion. Furthermore, oxidative reaction of zirconium with water releases hydrogen gas, which partly diffuses into the alloy and forms zirconium hydrides. The hydrides are less dense and are weaker mechanically than the alloy; their formation results in blistering and cracking of the cladding – a phenomenon known as hydrogen embrittlement.
Other articles related to "zirconium alloy, zirconium alloys, alloy, zirconium":
... Zirconium alloys are corrosion resistant and biocompatible, and therefore can be used for body implants ... In one particular application, a Zr-2.5Nb alloy is formed into a knee or hip implant and then oxidized to produce a hard ceramic surface for use in bearing against a polyethylene component ... This oxidized zirconium alloy material provides the beneficial surface properties of a ceramic (reduced friction and increased abrasion resistance), while ...
... Value zł 200 Alloy external ring Au900Cu100 internal ring Au900Ag60Cu40 core Au900Pd100 Quantity 4,000 pcs Quality Proof Issued 24 January 2001 Diameter 27.00 mm (1.06 ... Value zł 20 Alloy 925/1000 Ag oxidised and amber Quantity 30,000 pcs Quality Standard Issued 21 February 2001 Diameter 38.61 mm (1.52 in) Weight 28.28 g (1.00 oz 0.91 ozt) Market value 2.400 z ... Value zł 20 Alloy 925/1000 Ag and zirconium Quantity 25,000 pcs Quality Proof Issued 21 March 2001 Diameter 38.61 mm (1.52 in) Weight 28.28 g (1.00 oz 0.91 ozt) Market value ...
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“I live in the angle of a leaden wall, into whose composition was poured a little alloy of bell-metal. Often, in the repose of my mid-day, there reaches my ears a confused tintinnabulum from without. It is the noise of my contemporaries.”
—Henry David Thoreau (18171862)