Polycrystalline carbon conversion

Details Polycrystalline carbon conversion Polycrystalline carbon conversion

1998-12-07

2000-10-03

Kunemund, Robert

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from solid or gel state

Using heat

117 9, 117 10, 117929, 423446, C30B 2904

Patent

active

061267414

ABSTRACT:
A polycrystalline carbon body is converted to a different crystallography by directing an infrared laser beam at a crystal boundary interface. By using a beam having a 5.3 micron wavelength so as to fall within a 5-9 micron range of normal spectral transmittance of the carbon, the interface is heated for solid state conversion by passing the beam through a forward portion of the body without appreciably heating the forward portion. During heating, the interface propagates through the body, thus converting an ever-decreasing aft portion of the body to the different crystallography.

REFERENCES:
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patent: 5514880 (1996-05-01), Nishmira et al.
patent: 5683935 (1997-11-01), Miyamato et al.
patent: 5891241 (1999-04-01), Yoshida
Touloukian et al, "Thermal Radiative Properties, Nonmetallic Solids," Thermal Properties of Matter, vol. 8, 1972, pp: cover, 27, 28, and 1757.

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