Method for producing multiple polycrystalline bodies

Details Method for producing multiple polycrystalline bodies Method for producing multiple polycrystalline bodies

1985-05-20

1989-01-10

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

51307, 51309, 264140, 264141, C04B 3806

Patent

active

047972416

ABSTRACT:
A method is provided for producing multiple polycrystalline diamond and/or CBN bodies. The method involves mixing a temporary binding agent, such as paraffin, with a quantity of the crystals and then molding or extruding that mixture to produce temporarily held bodies. The temporarily held bodies are then placed in a reaction chamber and surrounded by a pressure transmitting medium, such as powdered cemented tungsten carbide. Preferably, the paraffin is removed by heat and vacuum. The reaction chamber is then pressed and heated thereby creating discrete polycrystalline diamond and/or CBN bodies of approximately the same shape and size as the temporarily held bodies. The preferred embodiment also includes the step of placing a separating layer of cobalt and graphite powder around the temporarily held bodies before they are surrounded by the pressure transmitting medium.

REFERENCES:
patent: 3745623 (1973-07-01), Wentorf, Jr. et al.
patent: 3819814 (1974-06-01), Pope
patent: 4224380 (1980-09-01), Bovenkerk et al.
patent: 4241135 (1980-12-01), Lee
patent: 4288248 (1981-09-01), Bovenkerk et al.
patent: 4417906 (1983-11-01), Ohno
patent: 4448591 (1984-05-01), Ohno
patent: 4525178 (1985-06-01), Hall
patent: 4525179 (1985-06-01), Gigl
patent: 4650776 (1987-03-01), Cerceau

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