Cemented carbide articles and master alloy composition
    22.
    发明授权
    Cemented carbide articles and master alloy composition 失效
    硬质合金制品和主合金组成

    公开(公告)号:US5841045A

    公开(公告)日:1998-11-24

    申请号:US518498

    申请日:1995-08-23

    摘要: A low melting point alloy is used to sinter metal carbide particles. The alloy is a eutectic-like alloy formed from a binding metal such as iron, cobalt or nickel, in combination with vanadium and chromium. The alloy is preferably formed by forming two separate alloys and blending these together. The first alloy is formed by spray drying together a solution of a binding metal salt such as a cobalt salt with a solution of a chromium salt. The formed particles are then carburized to form a cobalt-chromium-carbon alloy. A separate vanadium alloy is formed in the same manner. The two are combined to establish the amount of chromium and vanadium desired, and this, in turn, is used to sinter metal carbide parts. This permits sintering of the metal carbide parts at temperatures less than 1250.degree. C. and in turn significantly inhibits grain grown without a significant decrease in toughness. It is particularly adapted to form carbide products wherein the carbide grain size is as low as 120 nanometers.

    摘要翻译: 使用低熔点合金烧结金属碳化物颗粒。 该合金是由诸如铁,钴或镍的结合金属与钒和铬组合形成的共晶合金。 合金优选通过形成两个单独的合金并将它们混合在一起形成。 第一合金是通过将结合金属盐如钴盐与铬盐溶液一起喷雾干燥而形成的。 然后将形成的颗粒渗碳以形成钴 - 铬 - 碳合金。 以相同的方式形成单独的钒合金。 两者结合以确定所需的铬和钒的量,并且这又用于烧结金属碳化物部件。 这允许在小于1250℃的温度下烧结金属碳化物部件,并且进而显着抑制晶粒生长而不显着降低韧性。 特别适用于碳化物产物,其中碳化物晶粒尺寸低至120纳米。

    Method for producing amorphous based metals
    23.
    发明授权
    Method for producing amorphous based metals 失效
    无定形金属的制造方法

    公开(公告)号:US5776264A

    公开(公告)日:1998-07-07

    申请号:US631453

    申请日:1996-04-12

    摘要: Amorphous tungsten, cobalt, nickel, molybdenum, iron and alloys thereof can be formed by reducing metal-containing compositions to form the elemental metal wherein the particle size of the elemental metal is less than about 80 microns. This is oxidized in an oxygen-starved environment containing less than 3% oxygen and an inert gas to slowly oxidize the elemental metal. By oxidizing the metal under these conditions, the normal exotherm occurring during oxidation is avoided. The slow oxidation of the metal continues forming an amorphous metal oxide. The amorphous metal oxide can then be reacted in a reducing environment such as hydrogen to form the amorphous elemental metal. This amorphous elemental metal can then be reacted with a carburizing gas to form the carbide or ammonia gas to form the nitride or hexamethylsilane to form the silicide. This permits gas/solid reactions. The amorphous metal can also be used in a variety of different applications.

    摘要翻译: 无定形钨,钴,镍,钼,铁及其合金可以通过还原含金属的组合物形成元素金属,其中元素金属的粒度小于约80微米。 这在含有少于3%氧气和惰性气体的氧饥饿环境中被氧化,以缓慢氧化元素金属。 通过在这些条件下氧化金属,避免氧化过程中发生的正常放热。 金属的缓慢氧化继续形成无定形金属氧化物。 然后可以在诸如氢的还原环境中使无定形金属氧化物反应以形成非晶元素金属。 然后可以使该非晶元素金属与渗碳气体反应以形成碳化物或氨气,以形成氮化物或六甲基硅烷以形成硅化物。 这允许气体/固体反应。 非晶态金属也可用于各种不同的应用。

    Carbothermic reaction process for making nanophase WC-Co powders
    24.
    发明授权
    Carbothermic reaction process for making nanophase WC-Co powders 失效
    制备纳米相WC-Co粉末的碳热反应方法

    公开(公告)号:US5230729A

    公开(公告)日:1993-07-27

    申请号:US989955

    申请日:1992-12-10

    摘要: A new carbothermic reaction process is described for the thermochemical processing of nanophase WC-Co powders. The process permits shorter reaction times, reduced temperatures, and finer microstructures compared to conventional processing methods.The process builds on our experience with spray conversion processing but involves 1) chemical vapor infiltration reaction of the carbon infiltrant using a carbon source gas at a carbon activity greater than or equal to 1.0 with the particle substrate to form WC-CO; and 2) removal of any excess (unreacted) carbon by controlled gasification using a gas with carbon activity less than 1.0. A feature of the carbothermic reaction process is its adaptability to conventional WC-Co processing technology, as well as to spray conversion processing technology.The resulting power particles consist of a network of fine grains, (less than 100 nm) of WC and Co with interconnected fine porosity. Powder particles suitable for subsequent handling and consolidation are readily produced with diameters greater than 10 microns.

    摘要翻译: 描述了用于纳米相WC-Co粉末的热化学加工的新的碳热还原反应方法。 与常规加工方法相比,该方法允许较短的反应时间,降低的温度和更精细的微结构。 该过程建立在我们在喷雾转化处理方面的经验,但涉及1)使用碳源大于或等于1.0的碳源气体的碳渗透剂的化学气相渗透反应与颗粒底物形成WC-CO; 和2)通过使用碳活性小于1.0的气体通过受控气化除去任何过量(未反应的)碳。 碳热还原反应过程的特征是其适用于常规WC-Co加工技术,以及喷雾转化处理技术。 所得功率颗粒由具有相互连接的精细孔隙率的WC和Co(小于100nm)的细晶粒网络组成。 易于生产直径大于10微米的粉末颗粒适用于随后的处理和固结。

    Cr-promoted hydrotreating catalysts
    25.
    发明授权
    Cr-promoted hydrotreating catalysts 失效
    Cr促进加氢处理催化剂

    公开(公告)号:US4831002A

    公开(公告)日:1989-05-16

    申请号:US79247

    申请日:1987-07-29

    摘要: Self-promoted molybdenum and tungsten sulfide hydrotreating catalysts are prepared by heating one or more water soluble catalyst precursors in a non-oxidizing atmosphere in the presence of sulfur at a temperature of at least about 200.degree. C. The precursors are (Cr.sub.x M.sub.1-x L)[Mo.sub.y W.sub.1-y O.sub.4 ].sub.1+.5x wherein M is a divalent promoter metal selected from the group consisting of Mn, Fe, Co, Ni, Cu, Zn and mixtures thereof, x is any value from about 0.2 to 1, y is any value from 0 to 1, and wherein L is a nitrogen-containing, neutral multidentate, chelating ligand. In a preferred embodiment the lligand L will comprise one or more chelating alkyl di- or triamines and the non-oxidizing atmosphere will comprise H.sub.2 S.

    摘要翻译: 通过在至少约200℃的温度下在硫的存在下在非氧化性气氛中加热一种或多种水溶性催化剂前体来制备自促进的钼和硫化钨加氢处理催化剂。前体是(CrxM1-xL) [MoyW1-yO4] 1 + .5x其中M是选自Mn,Fe,Co,Ni,Cu,Zn及其混合物的二价促进剂金属,x是约0.2至1的任何值,y是任何 值为0至1,并且其中L为含氮中性多齿螯合配体。 在优选的实施方案中,配体L将包含一种或多种螯合烷基二胺或三胺,非氧化性气氛将包含H 2 S。