Hydrogen absorbing alloy powder and method of producing...

B - Operations – Transporting – 22 – F

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B22F 1/02 (2006.01) B22F 1/00 (2006.01) B22F 9/08 (2006.01) C01B 3/00 (2006.01) C22C 1/04 (2006.01) H01M 4/38 (2006.01)

Patent

CA 2266474

A method of treating surfaces of a hydrogen absorbing alloy and, particularly, a method of treating surfaces of a hydrogen absorbing alloy by enhancing the resistance of the surfaces of the powder against contamination such as oxide film, moisture and adsorptive gases when the alloy powder is being treated in the open air. In pulverizing or in treating a powdery hydrogen absorbing alloy or in producing a powder by the quickly quenched coagulation, the hydrogen absorbing alloy is treated in an atmosphere containing an SF6 gas to form a protection film containing at least a sulfide or a fluoride on the surfaces of the hydrogen absorbing alloy in order to enhance resistance against contamination. The method comprises a step for containing the hydrogen absorbing alloy in a container to pulverize it by hydrogenation in a hydrogen atmosphere, a step for dehydrogenation by evacuating the container, and a step for heat-treating the hydrogen absorbing alloy in an atmosphere containing the SF6 gas in the container.

L'invention concerne un procédé destiné à traiter des surfaces d'un alliage absorbant l'hydrogène, un procédé destiné à traiter des surfaces d'un alliage absorbant l'hydrogène, par amélioration de la résistance des surfaces de la poudre à une contamination, tel un film d'oxyde, de l'humidité et des gaz adsorbants lorsque la poudre d'alliage est traitée en plein air. Au cours de la pulvérisation ou du traitement d'un alliage poudreux absorbant l'hydrogène, ou de la production d'une poudre par coagulation inhibée brusquement, l'alliage absorbant l'hydrogène est traité dans une atmosphère contenant un gaz SF¿6? en vue de former un film de protection contenant au moins un sulfure ou un fluorure sur les surfaces de l'alliage absorbant l'hydrogène, afin d'améliorer sa résistance à une contamination. Ce procédé comprend une étape prévoyant le confinement de l'alliage absorbant l'hydrogène en vue de le pulvériser par hydrogénation dans une atmosphère d'hydrogène, une étape prévoyant une déshydrogénation par évacuation du conteneur, et une étape de traitement thermique de l'alliage absorbant l'hydrogène dans une atmosphère contenant le gaz SF¿6? dans le conteneur.

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