Patent · US Expired

Transistion layer polycrystalline diamond bearing

US4729440A · kind A · utility

208Cited by
17References
34Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 19, 1986
Grant dateMar 8, 1988
Priority date
Expiry dateMay 19, 2006

Classification

  • Technology area (CPC F)Mechanical Engineering; Lighting; Heating
  • CPC primaryF16C2352/00
  • WIPO fieldMechanical elements
  • WIPO sectorMechanical engineering

Abstract

An earth boring apparatus is disclosed having bearing members comprised of transition layer polycrystalline diamond. The transition layer polycrystalline diamond bearings include a polycrystalline diamond layer interfaced with a composite transition layer comprising a mixture of diamond crystals and precemented carbide pieces subjected to high temperature/high pressure conditions so as to form polycrystalline diamond material bonded to the precemented carbide pieces. The polycrystalline diamond layer acts as the bearing surface. The transition layer bearings are preferably supported by a cemented tungsten carbide substrate interfaced with the transition layer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.