Thermally-stable polycrystalline diamond materials and compacts

摘要

Thermally-stable polycrystalline diamond materials comprise a first phase including a plurality of bonded together diamond crystals, and a second phase including a reaction product formed between a binder/catalyst material and a material reactive with the binder/catalyst material. The reaction product is disposed within interstitial regions of the polycrystalline diamond material that exists between the bonded diamond crystals. The first and second phases are formed during a single high pressure/high temperature process condition. The reaction product has a coefficient of thermal expansion that is relatively closer to that of the bonded together diamond crystals than that of the binder/catalyst material.

主权项

1. A bit for drilling subterranean formations comprising a body and a number of wear elements operatively connected thereto, wherein each wear element comprises:
a diamond body comprising:
a first phase comprising an intercrystalline diamond-to-diamond bonded matrix extending throughout the diamond body; anda second phase comprising a reaction product formed between a binder/catalyst material used to facilitate diamond-to-diamond bonding, and a material that is reactive with the binder/catalyst material, the reaction product being disposed within interstitial regions within the intercrystalline bonded diamond matrix;wherein the second phase is substantially free of the binder/catalyst material after the reaction;wherein the binder/catalyst material is cobalt; and a metallic substrate in direct contact with the diamond body wherein the diamond body includes a first region comprising the catalyst/binder material and a second region comprising the reaction product, wherein the first region is substantially free of the reaction product, and wherein the second region is positioned along a wear surface of the wear element.