Ultrasharp polycrystalline diamond edges, points, and improved d

Details Ultrasharp polycrystalline diamond edges, points, and improved d Ultrasharp polycrystalline diamond edges, points, and improved d

1979-08-06

1981-06-16

Czaja, Donald E.

Abrasive tool making process, material, or composition

With inorganic material

51309, 83171, B24D 304

Patent

active

042735610

ABSTRACT:
Ultrasharp polycrystalline diamond edges, points, and improved diamond composites of predetermined configuration usable as cutting instruments, as high intensity sources for the emission of electrons, ions, neutrons, x-rays, coherent and incoherent light and high frequency electromagnetic radiation, and as ultraprecision molded mechanical and optical parts, or as high field permanent magnets or electrets, are produced by preparing and classifying natural and synthetic ultrafine uniform graphite particles, preferably of the rhombohedral phase, which are directly converted into diamond particles having a particle size of 3 to 100 angstroms, placing the ultrafine powder, either before or after the synthesis, with or without suitable additives, in a diamond mold defining the ultrafine edge or form to be produced, and applying a pressure of the order of 80 to 90 kb, preferably dynamic or static ultrahigh pressures of 100 to about 1000 kb, while heating the powder to a temperature of the order of 2440.degree. K. to 2500.degree. K., or preferably in the range of 2500.degree. to 3000.degree. K., in an ultrahigh vacuum or inert atmosphere after degassing to remove contaminants and avoid oxidation of the diamond powder. The requisite dimensional tolerances of the order of 10 to 100 angstroms are reproducibly obtained by final electron beam glazing and annealing using liquid helium systems with superconducting lenses of special design.

REFERENCES:
patent: 4084942 (1978-04-01), Villalobos
patent: 4164680 (1979-08-01), Villalobos

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