Polycrystalline diamond material with extremely fine microstructures

摘要

A sintered polycrystalline diamond material (PCD) of extremely fine grain size is manufactured by sintering under high pressure/high temperature (HP/HT) processing, a diamond powder which is blended with a pre-milled source catalyst metal compound. The PCD material has an average sintered diamond grain structure of less than about 1.0 μm.

主权项

1. A method for producing a polycrystalline diamond (PCD) body with an arithmetic mean as-sintered grain size less than 1 μm, comprising:
providing diamond particles having a volumetric mean particle size of less than about 1.0 μm and greater than about 0.1 μm; blending, with the diamond particles, a source catalyst metal compound selected from the group of cobalt oxalate dihydrate, cobalt acetate, cobalt boride, cobalt citrate dihydrate, cobalt hydroxide, cobalt isopropoxide, cobalt pentanedionate, and dodecacarbonyltretracobalt to form a diamond powder blend; and processing the diamond powder blend using a pressure and a temperature for a time sufficient to cause intercrystalline bonding between adjacent diamond grains.