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    Ammonium dodecamolybdomolybdate and method of making
    8.
    发明授权
    Ammonium dodecamolybdomolybdate and method of making 失效
    十二钼多钼酸铵及其制备方法

    公开(公告)号：US06793907B1

    公开(公告)日：2004-09-21

    申请号：US10207503

    申请日：2002-07-29

    申请人： Raj P. Singh ,  Thomas A. Wolfe ,  David L. Houck

    发明人： Raj P. Singh ,  Thomas A. Wolfe ,  David L. Houck

    IPC分类号： C01G3902

    CPC分类号： C01G39/00 ,  C01P2002/72 ,  C01P2002/74 ,  C01P2002/86

    摘要： A novel molybdenum compound, ammonium dodecamolybdomolybdate (AMM), is described which may be used in the manufacture of molybdenum metal and molybdenum carbide powders. The molybdenum compound is a dodecaheteropoly acid salt having a Keggin-type structure wherein molybdenum resides in both the hetero as well as peripheral atomic positions. The novel compound has the general formula (NH4)2Mo12MoO40.6H2O. Because of its low solubility, the compound can be crystallized efficiently and at a high purity from ammonium molybdate solutions.

    摘要翻译： 描述了一种新的钼化合物，十二烷基多钼酸铵（AMM），其可用于制造钼金属和碳化钼粉末。 钼化合物是具有Keggin型结构的十二杂多酸盐，其中钼位于杂原子和外周原子位置。 该新化合物具有通式（NH 4）2 Mo 12 MoO 40·6H 2 O。 由于溶解度低，化合物可以有效地从钼酸铵溶液中高纯度地结晶出来。

    Method for controlling the oxygen content in agglomerated molybdenum powders
    9.
    发明授权
    Method for controlling the oxygen content in agglomerated molybdenum powders 失效
    控制团聚钼粉中氧含量的方法

    公开(公告)号：US5173108A

    公开(公告)日：1992-12-22

    申请号：US790120

    申请日：1991-11-12

    申请人： David L. Houck

    发明人： David L. Houck

    IPC分类号： C22B34/34

    CPC分类号： C22B34/34

    摘要： A method is disclosed for producing an agglomerated molybdenum plasma spray powder with a controlled level of oxygen which comprises forming a relatively uniform mixture of agglomerated powders containing molybdenum dioxide and one or more ammonium-containing compounds of molybdenum wherein the mixture has an oxygen content of greater than about 25% by weight and reducing the mixture in a moving bed furnace at a temperature of from about 700.degree. C. to about 1000.degree. C. for a sufficient time to remove a portion of the oxygen therefrom and form reduced molybdenum powder agglomerates having an oxygen content of no greater than about 25% by weight. The reduction takes place in the direction from the outside surface of the agglometates to the inside surface.

    摘要翻译： 公开了一种用于生产具有受控的氧含量的聚集的钼等离子喷涂粉末的方法，其包括形成包含二氧化钼和一种或多种含钼化合物的钼的附聚粉末的相对均匀的混合物，其中所述混合物的氧含量更大 约25重量％，并且在移动床炉中将混合物在约700℃至约1000℃的温度下还原足够的时间以从其中除去一部分氧，并形成还原的钼粉附聚物，其具有 氧含量不大于约25重量％。 还原发生在从聚集体的外表面到内表面的方向上。

    Method for preparing powders of nickel alloy and molybdenum for thermal spray coatings
    10.
    发明授权
    Method for preparing powders of nickel alloy and molybdenum for thermal spray coatings 失效
    用于制备镍合金粉末和用于热喷涂的莫尔氏体的方法

    公开(公告)号：US5063021A

    公开(公告)日：1991-11-05

    申请号：US527456

    申请日：1990-05-23

    申请人： Vidhu Anand ,  Sanjay Sampath ,  Clarke D. Davis ,  David L. Houck

    发明人： Vidhu Anand ,  Sanjay Sampath ,  Clarke D. Davis ,  David L. Houck

    IPC分类号： C23C4/02 ,  C23C4/06

    CPC分类号： C23C4/067

    摘要： A method is disclosed for preparing an intimate mixture of powders of nickel-boron-silicon alloy and molybdenum metal powder suitable for thermal spray coatings which comprises milling a starting mixture of the alloy and molybdenum powder to produce a milled mixture wherein the average particle size is less than about 10 micrometers in diameter, forming an aqueous slurry of the resulting milled mixture and a binder which can be an ammoniacal molybdate compound or polyvinyl alcohol, and agglomerating the milled mixture and binder. The intimate mixture and binder are preferably sintered in a reducing atmosphere at a temperature of about 800.degree. C. to about 950.degree. C. for a sufficient time to form a sintered partially alloyed mixture wherein the bulk density is greater than about 1.2 g/cc. The resulting sintered mixture is preferably entrained in an inert carrier gas, passed into a plasma flame wherein the plasma gas can be argon or a mixture of argon and hydrogen, and maintained in the plasma flame for a sufficient time to melt essentially all of the powder particles of the sintered mixture to form spherical particles of the melted portion, and to further alloy the sintered mixture, and cooled.