472 results about "Titanium zirconium" patented technology

Provided is a method for the preparation of polycrystalline silicon in which, in conducting preparation of polycrystalline silicon by the Siemens method or by the monosilane method, no outer heating means is necessitated for the core member (seed rod), onto which polycrystalline silicon is deposited, from the initial stage of heating, the deposition rate is high and the core member seed rod can be used repeatedly.The method for deposition of high-purity polycrystalline silicon, at a high temperature, onto a white-heated seed rod in a closed reaction furnace by pyrolysis or hydrogen reduction of a starting silane gas supplied thereto, is characterized in that the seed rod is a member made from an alloy having a recrystallization temperature of 1200° C. or higher. It is preferable that the alloy member is of an alloy of Re—W, W—Ta, Zr—Nb, titanium-zirconium, or a carbon-added molybdenum (TZM) in the form of a wire member having a diameter of at least 0.5 mm, a plate member having a thickness of at least 1 mm or a prismatic member, or a tubular member having a diameter of at least 1 mm, wall thickness of at least 0.2 mm with an inner diameter not exceeding 5 mm, that the plate member, wire member, prismatic member or tubular member has a tapered form and further that the tubular member is a tapered duplex tube.

The invention discloses a novel regeneration cast aluminum alloy for structural application. The aluminum alloy that can be cast into structural components wherein at least some of the raw materials used to produce the alloy are sourced from secondary production sources. In addition to aluminum as the primary constituent, such an alloy includes 5 to 14% silicon, 0 to 1.5% copper, 0.2 to 0.55% magnesium, 0.2 to 1.2% iron, 0.1 to 0.6% manganese, 0 to 0.5% nickel, 0 to 0.8% zinc, 0 to 0.2% of other trace elements selected from the group consisting essentially of titanium, zirconium, vanadium, molybdenum and cobalt. In a preferred form, most of the aluminum is from a secondary production source. Methods of analyzing a secondary production aluminum alloy to determine its constituent makeup is also disclosed, as is a method of adjusting the constituent makeup of such an alloy in situations where the alloy is out of tolerance when measured against its primary source counterpart.

The present invention provides a catalyst capable of producing an epoxy compound in high yield and improving the utilization efficiency of the oxidizing agent as well as a method of producing an epoxy compound using that catalyst.A catalyst for producing an epoxy compound by oxidizing a compound having at least one ethylenic double bond with an oxidizing agent,comprising a polyatom-containing heteropolyoxometalate anion (A1) having two defective and / or three defective structure sites and containing silicon as the heteroatom, andan element (E1) being at least one element selected from the group consisting of vanadium, tantalum, niobium, antimony, bismuth, chromium, molybdenum, selenium, tellurium, rhenium, cobalt, nickel, ruthenium, rhodium, palladium, osmium, platinum, iridium, silver, gold, zinc, aluminum, gallium, indium, scandium, yttrium, titanium, zirconium, hafnium, germanium, tin and lanthanoids, and being different from the polyatom.