23-10-2014 дата публикации
Номер: US20140311293A1
A nanopowder and a method of making are disclosed. The nanopowder may be in the form of nanoparticles with an average size of less than about 200 nm and contain a reactive transition metal, such as hafnium, zirconium, or titanium. The nanopowder can be formed in a liquid under sonication by reducing a halide of the transition metal. 1. A method of producing nanoparticles comprising:reducing a titanium halide with lithium hydride in a sonically agitated liquid to form metallic nanoparticles comprising said titanium.2. A method of producing nanoparticles comprising:{'sub': 2', '2', '2', '2', '2', '2, 'reducing hafnium chloride or zirconium chloride with LiH, NaH, KH, RbH, CsH, FrH, BeH, MgH, CaH, SrH, BaH, and/or RaH'}in a sonically agitated liquid in the presence of a catalyst to form metallic nanoparticles comprising said hafnium or zirconium. This application claims the benefit of U.S. Provisional Application Ser. No. 61/186,451, filed Jun. 12, 2009, entitled SONOCHEMICALLY MEDIATED PREPARATION OF AIR-RESISTANT SUBCARBIDE AND SUBHYDRIDE NANOPOWDERS OF HAFNIUM, ZIRCONIUM, OR TITANIUM and further claims the benefit as a continuation of U.S. patent application Ser. No. 12/813,911, filed Jun. 11, 2010, entitled SONOCHEMICALLY MEDIATED PREPARATION OF NANOPOWDERS OF REACTIVE METALS, the disclosure of both of which are incorporated herein by reference in its entirety.Cross-reference is made to U.S. patent application Ser. No. 12/323,617, filed Nov. 26, 2008, entitled METAL HYDRIDE NANOPARTICLES, by Epshteyn, et al., the disclosure of which is incorporated herein by reference, in its entirety.The exemplary embodiment relates to a method for preparing nanopowders of reactive metals and their hydrides and carbides.Metal powders which include very small particles have a variety of uses. Currently, materials used for metalizing of energetic formulations are micron-scale aluminum particles. Problems associated with the burn properties of the traditional metal additives in ...
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