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1. 发明授权

US06495115B1 Method to produce a transition metal carbide from a partially reduced transition metal compound 失效
标题翻译：从部分还原的过渡金属化合物制备过渡金属碳化物的方法
公开(公告)号：US06495115B1
公开(公告)日：2002-12-17
申请号：US08703153
申请日：1996-08-29
申请人： Stephen D. Dunmead , Kevin J. Nilsen , Gabrielle R. Lasher , Joseph F. Repman , Hobart A. Barker , Alan W. Weimer
发明人： Stephen D. Dunmead , Kevin J. Nilsen , Gabrielle R. Lasher , Joseph F. Repman , Hobart A. Barker , Alan W. Weimer
IPC分类号： C01B3130
CPC分类号： C01B32/949 , C01B32/914 , C01P2002/72 , C01P2004/62 , C01P2006/11 , C01P2006/12 , C01P2006/80
摘要： A transition metal carbide is formed from a precursor mixture comprising at least one of the group consisting of: a transition metal, a transition metal carbide and a transition metal oxide. The precursor mixture may contain the desired transition metal carbide (e.g., WC), but if the desired transition metal carbide is present in the precursor mixture, there is necessarily a significant amount of another compound such as a transition metal oxide, undesired carbide (e.g., W2C) or transition metal. The method involves forming an admixture by mixing the precursor mixture with a sufficient amount of carbon to carburize the precursor mixture to the transition metal carbide and reacting the admixture in an inert or reducing atmosphere at a temperature for a time sufficient to convert the admixture to the transition metal carbide, wherein the admixture is reacted in the presence of a means to enhance transfer of heat into the admixture, an inert or reducing gas flowing through at least a portion of the admixture or combination thereof.
摘要翻译：过渡金属碳化物由包含过渡金属，过渡金属碳化物和过渡金属氧化物中的至少一种的前体混合物形成。前体混合物可以含有所需的过渡金属碳化物（例如WC），但是如果所需的过渡金属碳化物存在于前体混合物中，则必须有大量的其它化合物，例如过渡金属氧化物，不期望的碳化物（例如，W2C）或过渡金属。该方法包括通过将前体混合物与足够量的碳混合来形成混合物，以将前体混合物渗碳到过渡金属碳化物，并将该混合物在惰性或还原性气氛中在足以将混合物转化为过渡金属碳化物，其中所述混合物在增加热量进入所述混合物的手段的存在下反应，惰性或还原气体流过所述混合物的至少一部分或其组合。

2. 发明授权

US5942204A Method to produce a transition metal carbide from a partially reduced transition metal compound 失效
标题翻译：从部分还原的过渡金属化合物制备过渡金属碳化物的方法
公开(公告)号：US5942204A
公开(公告)日：1999-08-24
申请号：US967965
申请日：1997-11-12
申请人： Stephen D. Dunmead , Hobart A. Barker , John P. Henley , Pat J. DeLuca , Tom J. Bunnelle , Joe F. Repman , Daniel F. Carroll , Stephen A. Anderson
发明人： Stephen D. Dunmead , Hobart A. Barker , John P. Henley , Pat J. DeLuca , Tom J. Bunnelle , Joe F. Repman , Daniel F. Carroll , Stephen A. Anderson
IPC分类号： C01B31/30 , C01B31/34
CPC分类号： C01B31/303 , C01B31/305 , C01B31/34 , C01P2006/12 , C01P2006/80
摘要： A transition metal carbide (e.g., WC) is prepared by the following steps. A carbon-precursor mixture is formed by mixing a precursor comprised of (i) a transition metal oxide (e.g., WO.sub.x) and (ii) a material selected from the group consisting of: a transition metal (e.g., W); a transition metal carbide (e.g., WC) and a substoichiometric carbide (W.sub.2 C), in the presence of a source of carbon (e.g., carbon black) in an amount sufficient to form a reduced mixture comprised of the transition metal carbide and substoichiometric transition metal carbide, wherein the amount of the transition metal oxide and transition metal is essentially zero in said reduced mixture. The carbon-precursor mixture is heated in a reducing atmosphere (e.g., 5 percent hydrogen in argon) to a reducing temperature and for a time sufficient to produce the reduced mixture. The reduced mixture is milled in the presence of a source of carbon in an amount sufficient to carburize the substoichiometric transition metal carbide to form the transition metal upon heating in a reducing atmosphere. Finally, the milled reduced mixture is heated in a reducing atmosphere to a carburizing temperature that is greater than the reducing temperature for a time sufficient to carburize the substoichiometric transition metal carbide to form the transition metal carbide of this invention (e.g., WC).
摘要翻译：通过以下步骤制备过渡金属碳化物（例如WC）。通过混合由（i）过渡金属氧化物（例如WOx）和（ii）选自以下的材料组成的前体形成碳前体混合物：过渡金属（例如W）; 在碳源（例如炭黑）存在下，过渡金属碳化物（例如WC）和亚化学计量碳化物（W2C）的量足以形成由过渡金属碳化物和亚化学计量过渡金属组成的还原混合物碳化物，其中过渡金属氧化物和过渡金属的量在所述还原的混合物中基本为零。将碳前体混合物在还原气氛（例如氩气中的5％氢气）中加热至还原温度并持续足以产生还原混合物的时间。将还原的混合物在碳源存在下研磨，其量足以使亚化学计量过渡金属碳化物渗碳以在还原气氛中加热时形成过渡金属。最后，将研磨后的还原混合物在还原气氛中加热至大于还原温度的渗碳温度足以使亚化学计量过渡金属碳化物渗碳形成本发明的过渡金属碳化物（例如WC）的时间。

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