Delayed diffusion of novel species from the back side of carbide

摘要

A polycrystalline diamond compact (PDC) is fabricated using a process of delayed diffusion of a diffusion species (e.g., a metalloid) introduced from the back side of a cemented carbide further away from the diamond grit or from the flank side of the cemented carbide, as opposed to the side of the cemented carbide adjacent to the diamond grit. The process of fabricating the PDC includes depositing, in a metal container, a diamond grit, a cemented carbide, and a diffusion species, then applying a high pressure and high temperature (HPHT) to the contents of the metal container wherein (1) the binder of cemented carbide diffuses across the diamond grit, and (2) the diffusion species diffuses through the cemented carbide, and then through the diamond grit, thus providing a protective coating to the diamond grains of the PDC.

主权项

1. A process of fabricating a polycrystalline diamond compact (PDC), comprising:
depositing, in a metal container, an amount of a diamond grit; depositing, in the metal container, an amount of a cemented carbide having a binder content adjacent to the diamond grit; depositing, in the metal container, an amount of a diffusion species, such that the diffusion species is spaced apart from the diamond grit by the cemented carbide; and applying a high pressure and high temperature to the diamond grit, the cemented carbide, and the diffusion species,wherein the binder content in the cemented carbide infiltrates across the diamond grit firstly, andwherein the diffusion species diffuses across the cemented carbide and then the diamond grit secondly.