Method of forming metal carbides and metal carbide composites

Details Method of forming metal carbides and metal carbide composites Method of forming metal carbides and metal carbide composites

C - Chemistry, Metallurgy

01

B

C01B 31/30 (2006.01) C01B 31/34 (2006.01) C22C 1/05 (2006.01)

Patent

CA 2221432

The process of carburizing metals such as tungsten is greatly facilitated by forming a solution of a metal-containing compound such as ammonium paratungstate with an organic acid, and spray drying the composition to form precursor particles. The precursor particles are then calcined in an atmosphere which will cause partial carburization of the metal. Carburization is completed by heating this in a carburizing atmosphere. This is also useful for facilitating dissolution of certain metal compositions such as ammonium paratungstate, which is easily solubilized in water with the assistance of glycine. Preferably, the solution also incorporates a matrix metal composition such as a cobalt composition to form nanophase tungsten carbide particles in a cobalt matrix.

Méthode pour carburer des métaux comme le tungstène, rendue beaucoup plus facile grâce à la formation d'une solution d'un composé métallique, comme le paratungstate d'ammonium, avec un acide organique, et séchage par pulvérisation de la composition pour former des particules de précurseur. Les particules de précurseur sont ensuite calcinées dans une atmosphère qui provoque la carburation partielle du métal. La carburation est parachevée par chauffage de ce métal dans une atmosphère carburante. Cela facilite également la dissolution de certaines compositions métalliques, comme le paratungstate d'ammonium, lequel est facilement solubilisé dans l'eau à l'aide de glycine. L'invention privilégie également l'incorporation dans la solution d'une composition métallique, comme une composition de cobalt, pour former des particules de carbure de tungstène nanophase dans une matrice de cobalt.

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