| 主权项 |
1. A process for the formation of pellets each containing a single superhard core coated with an encapsulating material, the process including the steps of:
utilising a shovel rotor in combination with a rotating pan and/or a fluidised bed apparatus in sequence; providing a source of superhard cores; providing an encapsulating mixture comprising a binder, a solvent or fluid medium and a coating or encapsulating material; combining the superhard cores and the encapsulating mixture in a shovel rotor comprising a vessel including a rotor, the vessel adapted to receive a stream of gas; rotating the rotor at a velocity such that the superhard cores are encapsulated by the encapsulating mixture to form pellets, each pellet consisting of a single superhard core and the encapsulating mixture; introducing the pellets into a rotating vessel; and contacting the pellets with encapsulating mixture to form pellets of greater mass than the pellets introduced into the rotating vessel, each pellet consisting of a single superhard core and the encapsulating mixture, wherein the superhard cores are selected from the group consisting of diamond, cubic boron nitride, wurtzitic boron nitride, a carbide, oxide or silicide, Si3N4, SiC, Al2O3, AlC, SiO2 and/or clusters of any thereof. |
