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    METHOD OF MAKING METALLIC CARBIDE POWDERS
    1.
    发明申请
    METHOD OF MAKING METALLIC CARBIDE POWDERS 审中-公开
    制造金属碳化物粉末的方法

    公开(公告)号：WO1995021946A1

    公开(公告)日：1995-08-17

    申请号：PCT/US1995001675

    申请日：1995-02-10

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  DUNMEAD, Stephen, D. ,  MOSSNER, David, D.

    IPC: C22C29/08

    CPC classification number: C01B32/949 ,  C01B32/90 ,  C01B32/907 ,  C01P2004/62 ,  C01P2006/80

    Abstract: A method of making metallic carbide powders includes heating a non-static solid reactant mixture of a metal oxide and a source of carbon to a first elevated temperature which is sufficient to cause at least partial carburization of the mixture. The heating is performed in a non-reducing atmosphere having a total pressure of at least one atmosphere for a sufficient time to form a partially-carburized mixture. The source of carbon is employed at a level which is less than the stoichiometric amount needed to produce the metallic carbide. The method may further include admixing a sufficient level of a source of carbon to the partially-carburized mixture to form an adjusted mixture having a total carbon content of the stoichiometric amount needed to make the metallic carbide and carburizing the adjusted mixture in a hydrogen-containing atmosphere at a second elevated temperature which is sufficient to cause the adjusted mixture to form the metallic carbide having a particle size of less than 0.2 micrometers in diameter.

    Abstract translation: 制备金属碳化物粉末的方法包括将金属氧化物和碳源的非静态固体反应物混合物加热至足以引起混合物至少部分渗碳的第一升高温度。 加热在具有至少一个气氛的总压力的非还原气氛中进行足够的时间以形成部分渗碳的混合物。 碳源的使用量低于生产金属碳化物所需的化学计量量。 该方法还可以包括将足够水平的碳源混合到部分渗碳的混合物中以形成调整的混合物，其具有制备金属碳化物所需的化学计量量的总碳含量并将调节的混合物渗碳在含氢的 气氛在足以使经调整的混合物形成粒径小于0.2微米直径的金属碳化物的第二升高温度下进行。

    LOW TEMPERATURE METHOD FOR SYNTHESIZING MICROGRAIN TUNGSTEN CARBIDE
    2.
    发明申请
    LOW TEMPERATURE METHOD FOR SYNTHESIZING MICROGRAIN TUNGSTEN CARBIDE 审中-公开
    用于合成微晶碳化钨的低温方法

    公开(公告)号：WO1993010042A1

    公开(公告)日：1993-05-27

    申请号：PCT/US1992009056

    申请日：1992-10-26

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  DUNMEAD, Stephen, D. ,  MOORE, William, G. ,  GRINDAHL, Eric, J.

    IPC: C01B31/34

    CPC classification number: B82Y30/00 ,  C01B32/949 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/80

    Abstract: A low temperature method for synthesizing micrograin tungsten carbide particles having an average diameter of 0.05 to 0.2 mu m includes the programmed heating of tungsten trioxide powder or other material containing tungsten in a flowing molecular hydrogen atmosphere having a constant proportion of molecular methane. The heating program is carried out at two different heating rates, the first being higher than the second. The first heating rate is 5 DEG C to 50 DEG C per minute from 25 DEG C to 535 DEG C. The second heating rate is 1 DEG C to 10 DEG C per minute from 535 DEG C to about 850 DEG C. The last temperature is then held until conversion of the tungsten trioxide or other tungsten-containing material to tungsten carbide is complete, typically from about 15 minutes to 3 hours.

    Abstract translation: 用于合成平均直径为0.05〜0.2μm的微晶碳化钨颗粒的低温方法包括在具有恒定比例的分子甲烷的流动分子氢气氛中编程加热三氧化钨粉末或其它含钨材料。 加热程序以两种不同的加热速率进行，第一种高于第二种。 第一次加热速率为25℃至535℃的5℃至50℃/分钟。第二次加热速率为53℃至850℃的每分钟1℃至10℃。最后的温度 然后保持直到三氧化钨或其它含钨材料转化为碳化钨完全，通常为约15分钟至3小时。

    CEMENTED CERAMIC TOOL MADE FROM ULTRAFINE SOLID SOLUTION POWDERS, METHOD OF MAKING SAME, AND THE MATERIAL THEREOF
    3.
    发明申请
    CEMENTED CERAMIC TOOL MADE FROM ULTRAFINE SOLID SOLUTION POWDERS, METHOD OF MAKING SAME, AND THE MATERIAL THEREOF 审中-公开
    来自超固体固溶体粉末的烧结陶瓷工具，其制备方法及其材料

    公开(公告)号：WO1996022399A1

    公开(公告)日：1996-07-25

    申请号：PCT/US1996000616

    申请日：1996-01-19

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  DUBENSKY, Ellen, M. ,  DUNMEAD, Stephen, D. ,  CARROLL, Daniel, F.

    IPC: C22C01/05

    CPC classification number: C22C29/08 ,  Y10T428/12014 ,  Y10T428/12028 ,  Y10T428/12049 ,  Y10T428/12056 ,  Y10T428/1216

    Abstract: A multi-phase cemented ceramic material useful for metal working, including ferrous metals, titanium, aluminum and other metals. The material preferably has a microstructure which includes platelets, a range of grain sizes which yields superior hardness and other characteristics, and a low tungsten concentration within the binder phase. The preferred composition includes ultrafine WC, an ultrafine solid solution of (Ti, Ta, W)C, and a cobalt binder. Platelets are formed in situ, eliminating the need to add them during manufacture for improving toughness.

    Abstract translation: 用于金属加工的多相胶合陶瓷材料，包括黑色金属，钛，铝和其他金属。 该材料优选具有微结构，其包括片晶，一定范围的晶粒尺寸，其产生优异的硬度和其它特性，以及在粘结相中的低钨浓度。 优选的组合物包括超细WC，（Ti，Ta，W）C和钴粘合剂的超细固溶体。 血小板原位形成，不需要在制造过程中添加血小板来改善韧性。

    METALLIC CARBIDE-GROUP VIII METAL POWDER AND ITS PREPARATION
    6.
    发明申请
    METALLIC CARBIDE-GROUP VIII METAL POWDER AND ITS PREPARATION 审中-公开
    金属碳化Ⅷ族金属粉及其制备

    公开(公告)号：WO1997046497A1

    公开(公告)日：1997-12-11

    申请号：PCT/US1997009680

    申请日：1997-06-04

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  DUNMEAD, Stephen, D. ,  ROMANOWSKI, Michael, J.

    IPC: C04B35/56

    CPC classification number: C22C29/08 ,  C01B32/907 ,  C01B32/914 ,  C01P2002/60 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/80 ,  C01P2006/80 ,  C22C1/055 ,  Y10S977/777

    Abstract: A transition metal carbide-Group VIII metal powder comprising discrete particles of a transition metal carbide and Group VIII metal wherein: substantially all of the particles have a size of at most 0.4 micrometer; the transition metal carbide is selected from carbides of the group consistig of tungsten, titanium, tantalum, molybdenum, zirconium, hafnium, vanadium, niobium, chromium, mixtures and solid solutions thereof; and the Group VIII metal is selected from the group consisting of iron, cobalt, nickel, mixtures and solid solutions thereof. Said powders were produced by heating an admixture comprising a finishing source of carbon (for example, acetylene black), a source of a group VIII metal (for example, Co3O4), and a particulate precursor to a temperature of 1173K to 1773K for a time sufficient to form a transition metal carbide-Group VIII metal powder, wherein at least 25 percent by weight of the carbide precursor is carburized in forming the transition metal carbide of the transition metal carbide-Group VIII metal powder. The particulate precursor generally contains less than 2.5 percent oxygen by weight and contains compounds which undergo carburization such as a transition metal (for example, W), lower valence transition metal carbide (W2C) to form the transition metal carbide (for example, WC)-Group VIII metal powder.

    Abstract translation: 一种过渡金属碳化物 - Ⅷ族金属粉末，其包含过渡金属碳化物和Ⅷ族金属的离散颗粒，其中：基本上所有颗粒的尺寸至多为0.4微米; 过渡金属碳化物选自由钨，钛，钽，钼，锆，铪，钒，铌，铬组成的组的碳化物，其混合物和固溶体; 并且VIII族金属选自铁，钴，镍，其混合物和固溶体。 所述粉末是通过加热包含碳的整理源（例如乙炔黑），VIII族金属源（例如Co 3 O 4）和颗粒前体的混合物达到1173K至1773K的温度一段时间 足以形成过渡金属碳化物 - Ⅷ族金属粉末，其中至少25重量％的碳化物前体在形成过渡金属碳化物 - Ⅷ族金属粉末的过渡金属碳化物中被渗碳。 颗粒前体通常含有小于2.5重量％的氧，并且包含经历渗碳的化合物，例如过渡金属（例如W），低价过渡金属碳化物（W2C）以形成过渡金属碳化物（例如WC） - VIII族金属粉末。

    SINGLE STEP SYNTHESIS AND DENSIFICATION OF CERAMIC-CERAMIC AND CERAMIC-METAL COMPOSITE MATERIALS
    7.
    发明申请
    SINGLE STEP SYNTHESIS AND DENSIFICATION OF CERAMIC-CERAMIC AND CERAMIC-METAL COMPOSITE MATERIALS 审中-公开
    陶瓷和陶瓷 - 金属复合材料的单步合成与渗透

    公开(公告)号：WO1997012999A1

    公开(公告)日：1997-04-10

    申请号：PCT/US1996015846

    申请日：1996-10-02

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： THE DOW CHEMICAL COMPANY ,  DUNMEAD, Stephen, D. ,  ROMANOWSKY, Michael, J.

    IPC: C22C01/05

    CPC classification number: C22C1/058 ,  B22F2999/00 ,  C22C29/00 ,  B22F3/14

    Abstract: Ceramic-ceramic and ceramic-metal composite materials are disclosed which contain at least two ceramic phases and at least one metallic phase. At least one of these ceramic phases is a metal boride or mixture of metal borides and another of the ceramic phases is a metallic nitride, metallic carbide, or a mixture of metallic nitride and a metallic carbide. These composite materials may be made by a combustion synthesis process which includes the step of igniting a mixture of at least one element selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, aluminum and silicon, or a combination of two or more thereof, at least one boron compound selected from boron nitride, boron carbide, or a combination thereof and an ignition temperature reducing amount of a metal selected from iron, cobalt, nickel, copper, aluminum, silicon, palladium, platinum, silver, gold, ruthenium, rhodium, osmium, and iridium, or a mixture of two or more thereof, provided that at least one of the aforementioned elements is different from at least one of the aforementioned metals. This process permits a high degree of control over the microstructure of the product and relatively low pressures are required to obtain high composite material density. A densified product having high density and a finely grained microstructure may be obtained by applying mechanical pressure during combustion synthesis. The composites have improved hardness, toughness, strength, resistance to wear, and resistance to catastrophic failure.

    Abstract translation: 公开了陶瓷陶瓷和陶瓷 - 金属复合材料，其包含至少两个陶瓷相和至少一个金属相。 这些陶瓷相中的至少一个是金属硼化物或金属硼化物的混合物，另一个陶瓷相是金属氮化物，金属碳化物或金属氮化物和金属碳化物的混合物。 这些复合材料可以通过燃烧合成方法制造，其包括点燃选自钛，锆，铪，钒，铌，钽，铬，钼，钨，铝和硅中的至少一种元素的混合物的步骤，或者 其中两种或更多种的组合，至少一种选自氮化硼，碳化硼或其组合的硼化合物和选自铁，钴，镍，铜，铝，硅，钯，铂的金属的点火降温量 ，银，金，钌，铑，锇和铱，或其两种或更多种的混合物，前提是至少一种上述元素不同于至少一种上述金属。 该方法允许对产品的微观结构进行高度的控制，并且需要相对低的压力以获得高的复合材料密度。 可以通过在燃烧合成期间施加机械压力来获得具有高密度和细粒度微观结构的致密化产品。 复合材料具有改善的硬度，韧性，强度，耐磨性和耐灾难性故障。

    METHOD OF MAKING METALLIC CARBIDE POWDERS
    9.
    发明公开
    METHOD OF MAKING METALLIC CARBIDE POWDERS 失效
    用于生产金属碳化物粉末

    公开(公告)号：EP0745145A1

    公开(公告)日：1996-12-04

    申请号：EP95910222.0

    申请日：1995-02-10

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： DUNMEAD, Stephen, D. ,  MOSSNER, David, D.

    IPC: B22F9 ,  C01B31

    CPC classification number: C01B32/949 ,  C01B32/90 ,  C01B32/907 ,  C01P2004/62 ,  C01P2006/80

    Abstract: A method of making metallic carbide powders includes heating a non-static solid reactant mixture of a metal oxide and a source of carbon to a first elevated temperature which is sufficient to cause at least partial carburization of the mixture. The heating is performed in a non-reducing atmosphere having a total pressure of at least one atmosphere for a sufficient time to form a partially-carburized mixture. The source of carbon is employed at a level which is less than the stoichiometric amount needed to produce the metallic carbide. The method may further include admixing a sufficient level of a source of carbon to the partially-carburized mixture to form an adjusted mixture having a total carbon content of the stoichiometric amount needed to make the metallic carbide and carburizing the adjusted mixture in a hydrogen-containing atmosphere at a second elevated temperature which is sufficient to cause the adjusted mixture to form the metallic carbide having a particle size of less than 0.2 micrometers in diameter.

    LOW TEMPERATURE METHOD FOR SYNTHESIZING MICROGRAIN TUNGSTEN CARBIDE
    10.
    发明公开
    LOW TEMPERATURE METHOD FOR SYNTHESIZING MICROGRAIN TUNGSTEN CARBIDE 失效
    低温工艺合成碳化钨FEINSTKÖRNIGEM的。

    公开(公告)号：EP0613449A1

    公开(公告)日：1994-09-07

    申请号：EP92922209.0

    申请日：1992-10-26

    Applicant: THE DOW CHEMICAL COMPANY

    Inventor： DUNMEAD, Stephen, D. ,  MOORE, William, G. ,  GRINDAHL, Eric, J.

    IPC: C01B31

    CPC classification number: B82Y30/00 ,  C01B32/949 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/80

    Abstract: A method for forming monotungsten carbide, comprising heating a solid, non-elemental tungsten-containing material in a flowing atmosphere containing molecular hydrogen and molecular methane for a time sufficient to convert substantially all of the tungsten-containing material to monotungsten carbide, The heating brings the temperature of the tungsten-containing material to a first elevated temperature of from about 520 to about 550 DEG C. and, subsequently, at a rate of from about 3 to about 10 DEG C. per minute, the heating brings the temperature from the first elevated temperature to a second elevated temperature of about 800 to about 900 DEG C. Thereafter the temperature is held at the second elevated temperature for at least about 15 minutes. At least about 50 weight percent of the monotungsten carbide formed is formed while holding the temperature at the second elevated temperature.

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