Abrasive tool making process – material – or composition – With inorganic material – Metal or metal oxide
Patent
1979-11-19
1981-03-31
Czasa, Donald E.
Abrasive tool making process, material, or composition
With inorganic material
Metal or metal oxide
51307, 51308, B24D 302
Patent
active
042590906
ABSTRACT:
An improvement in the manufacture of diamond compacts is disclosed in which a cylindrical mass of polycrystalline diamond is surrounded by and bonded to an outer mass of metal which provides support for the diamond. The improvement comprises the use of seed diamond to grow the polycrystalline mass under high pressure-high temperature (HP/HT) conditions from non-diamond carbon, utilizing a catalyst metal contained in the outer metal annulus. Preferably, this improved process is carried out using a cup-shaped metal mass having a stable carbide content of at least 10% and a coefficient of thermal expansion slightly higher than diamond. It is also preferred to heat the sample (the outer metal mass and the inner graphite mass) directly by passing an electric current through the outer metal mass in the HP/HT process during which the polycrystalline compact is formed.
REFERENCES:
patent: 3407445 (1968-10-01), Strong
patent: 3850053 (1974-11-01), Bovenkerk
patent: 3850591 (1974-11-01), Wentorf
patent: 4089933 (1978-05-01), Vereschagin
patent: 4151686 (1979-05-01), Lee et al.
patent: 4167399 (1979-09-01), Lee et al.
patent: 4168957 (1979-09-01), Lee et al.
Czasa Donald E.
General Electric Company
Little Douglas B.
Thompson W.
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