Composite abrasive compact having high thermal stability and transverse rupture strength
OwnerRobert H. Frushourinventor
Life of this patent
Estimating the term…
Abstract
A composite compact adapted for high-temperature uses, such as a cutter on a rotary drill bit, which includes a relatively thick table of diamond or boron nitride particles with a strong, chemically inert binder matrix and a thin metal layer bonded directly to the table in a HP/HT press. The table is characterized by having high thermal stability at temperatures up to 1200.degree. C. The thickness of the thin metal layer, which does not exceed one-half that of the table, is selected such that at temperatures up to 1200.degree. C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Claims13
A composite abrasive compact having high thermal stability at temperatures of at least 850.degree. C. and transverse rupture strength of at least 70 Kg/mm.sup.2 which includes
- a relatively thick table of well sintered abrasive particles bonded in particle-to-particle contact with interstices between adjacent particles,
- a strong chemically inert binder matrix dispersed throughout the table in the interstices, and
- a relatively thin layer of metal having a melting point above 1000.degree. C. bonded directly to the table in a HP/HT press.
A composite compact which is thermally stable at temperatures up to 1200.degree. C. and which includes
- an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact,
- a strong binder matrix which includes a non-catalyst solvent metal dispersed throughout the table, and
- a thin layer of metal having a melting point above 1000.degree. C. bonded directly to the table in a HP/HT press.
A composite compact which is thermally stable at temperatures up to 1200.degree. C. and which includes
- an abrasive table of well sintered particles chosen from the group which includes diamond and boron nitride, said particles being bonded in particle-to-particle contact, and
- a thin layer of metal having a melting point above 1200.degree. C. bonded directly to the table in a HP/HT press, the thickness of the layer being such that at temperatures up to 1200.degree. C. the differential forces due to thermal expansion do not exceed the fracture strength of the table.
Dependencies are inferred from the claim text.