Polycrystalline abrasive grit

Details Polycrystalline abrasive grit Polycrystalline abrasive grit

2005-07-05

2005-07-05

Marcheschi, Michael (Department: 1755)

Abrasive tool making process, material, or composition

With inorganic material

C051S309000, C051S298000, C051S293000

Reexamination Certificate

active

06913633

ABSTRACT:
A method is provided for producing a plurality of polycrystalline ultra-hard abrasive grit. The method includes the steps of providing a mass of ultra-hard abrasive particles or a mass of a combination of a precursor for such particles and a suitable solvent/catalyst, forming the mass into a plurality of green state granules, placing the granules with a separating medium between adjacent granules in the reaction zone of a high pressure/high temperature apparatus, subjecting the contents of the reaction zone to elevated temperature and pressure conditions which the ultra-hard abrasive particle is crystallographically stable, recovering the thus sintered material from the reaction zone and removing the separating medium in the sintered material to produce a plurality of crystalline abrasive grit. The ultra-hard abrasive is generally diamond or cubic boron nitride.

REFERENCES:
patent: 4224380 (1980-09-01), Bovenkerk et al.
patent: 4505746 (1985-03-01), Nakai et al.
patent: 5980982 (1999-11-01), Degawa et al.
patent: 2004/0076748 (2004-04-01), Fries et al.
patent: 0 012 631 (1980-06-01), None

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