Aqueous leaching solutions and methods of leaching at least one interstitial constituent from a polycrystalline diamond body using the same

US10173899B1 · kind B1 · utility

Assignee

• US Synthetic Corporation · US

Inventors

• Julie Ann Kidd · North Ogden, US
• Heather Marie Schaefer · North Ogden, US
• Chengkun Xu · Downieville, US
• Jason K. Wiggins · Draper, US
• Matthew Sinclair Brown · Provo, US
• Cody Frisby · Payson, US

Key dates

• Filing date: Mar 9, 2016
• Grant date: Jan 8, 2019
• Expiry date: Mar 9, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2203/062
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

In an embodiment, a method of fabricating a leached polycrystalline diamond (“PCD”) body is disclosed. The PCD body includes bonded diamond grains defining interstitial regions at least a portion of which include at least one interstitial constituent disposed therein. The method includes leaching the PCD body with a leaching agent to remove at least a portion of the at least one interstitial constituent therefrom. The leaching agent includes a mixture having hydrofluoric acid in a first concentration of about 10 weight % to about 50 weight %, nitric acid in a second concentration of about 5 weight % to about 25 weight %, and water in a third concentration of about 25 weight % to about 85 weight %. Further embodiments relate to different leaching methods and different leaching agent compositions.