Fine powder of single-crystalline diamond and method for...

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 31/06 (2006.01)

Patent

CA 2594669

Provided are a fine powder of single-crystalline diamond having a sharp form, a narrow particle size range and a size of less than 50 nm; and a method for producing the above fine powder in high efficiency. A method for producing a fine powder of single crystalline diamond, which comprises preparing a rough finely particulate diamond by the mechanical crushing of a single-crystalline raw material diamond, imparting hydrophilicity to the surface of the rough finely particulate diamond, subjecting a water slurry of the resultant rough finely particulate diamond having hydrophilicity being maintained in an weak alkaline state to the former classification step, to thereby remove an upper fraction having a D 50 value of 60 nm+, adjusting the diamond concentration of the slurry being freed of the upper fraction to 0.1 wt % or less, subjecting the resultant slurry to centrifugal force, to thereby coagulate and separate a part containing the diamond having a relatively rough range of particle size from the slurry, and on the other hand, allow a water medium containing a fraction having a reduced average particle size to flow out from the centrifugal separation step as a flow-out fluid.

Poudre fine de diamant monocristallin adoptant une forme pointue, à granulométrie étroite et à taille inférieure à 50 nm; et procédé d'obtention de la poudre fine à haut rendement. Le procédé de production de la poudre fine de diamant monocristallin consiste à préparer un diamant à particules fines grossier par broyage mécanique d'un diamant brut monocristallin, à conférer une propriété hydrophile à la surface du diamant grossier, à soumettre une suspension aqueuse du diamant obtenue hydrophile maintenu à l'état alcalin faible à une étape de classification antérieure afin de supprimer une fraction supérieure ayant une valeur D 50 de 60 nm+, à régler la teneur de suspension aqueuse du diamant exempte de fraction supérieure à 0,1 % en poids ou moins, à soumettre la suspension aqueuse obtenue à une force centrifuge afin de coaguler et de séparer une partie contenant le diamant dont la granulométrie est relativement grossière à partir de la suspension aqueuse d'une part, et à permettre à un milieu d'eau contenant une fraction à granulométrie moyenne réduite de s'écouler depuis l'étape de séparation centrifuge sous forme de fluide, d'autre part.

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