Gaseous phase synthesized diamond and method for synthesizing sa

Details Gaseous phase synthesized diamond and method for synthesizing sa Gaseous phase synthesized diamond and method for synthesizing sa

1987-07-22

1990-02-13

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

428701, B24D 302, C04B 3116

Patent

active

049006282

ABSTRACT:
The present invention relates to gaseous phase synthesized diamond and a method of synthesizing the same. In order to obtain crystalline diamond having remarkably high completeness and hardly containing carbon having a construction other than that of diamond, raw material gases are thermally activated by a thermoelectron-radiating material heated at an extremely high temperature, the thermoelectron-radiating material being connected to a negative pole while a substrate to be coated is connected to a positive pole, by the use of a direct current power source, a plasma being formed between the thermoelectron-radiating material and the substrate by applying a direct current voltage, and a diamond film having an average particle size of 2 microns or less, compression residual stress and electric resistance of 10.sup.8 ohm.cm or more being formed on the substrate by using the activation by the thermoelectron-radiating material together with the activation by the formation of DC plasma.
In addition, homogeneous diamond particles uniform in shape can be obtained by using this method.

REFERENCES:
patent: 4734339 (1988-03-01), Schachner et al.
Matsumoto et al., "Growth of Diamond Particles from Methane Hydrogen Gas", Nat. Inst. for Research in Inorg. Mat., Japan, J. of Materials Science 17 (1982) 3106-3112.

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