Synthesis of phase stabilized vanadium and chromium carbides

C - Chemistry – Metallurgy – 01 – B

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C01B 31/30 (2006.01)

Patent

CA 2215268

In order to eliminate the oxygen sensitivity of chromium carbide and vanadium carbide particles, vanadium carbide and chromium carbide particles are formed by carburizing a precursor compound at a elevated reaction temperature of about 950° C. Initially, the precursor compound is heated in an inert nitrogen-containing gas to the reaction temperature. Once the reaction temperature is achieved, hydrogen and a carbon-containing gas such as methane or ethylene are used to conduct the carbonization. After the carbonization has been completed, the carbonizing gas is then replaced with an inert nitrogen-containing gas and the product allowed to cool down. The carbonization cycle is adjusted so that the oxygen level is kept to less than 0.35%, while the nitrogen level is kept at about 2%. Powders produced from this process show minimal or no oxygen pickup when exposed to ambient air.

Afin de supprimer la sensibilité des particules de carbure de chrome et de carbure de vanadium à l'oxygène, ces carbures sont formés par cémentation d'un composé précurseur à une température de réaction élevée, soit environ 950 degrés C. Au départ, le précurseur est chauffé dans un gaz inerte à base d'azote à la température de réaction. Une fois cette température atteinte, un gaz hydrocarboné, comme le méthane ou l'éthylène, est utilisé pour effectuer la cémentation. Après l'achèvement de celle-ci, le gaz de cémentation est remplacé par un gaz inerte renfermant de l'azote, et on laisse refroidir le produit. Le cycle de cémentation est ajusté de telle façon que la teneur en oxygène demeure en dessous de 0,35 %, et celle en azote à environ 2 %. Les poudres ainsi obtenues n'absorbent que peu ou pas du tout d'oxygène lorsqu'elles sont exposées à l'air ambiant.

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