Heat treatment of carbon under high pressure

✍ Scribed by T. Noda; H. Kato

• Publisher: Elsevier Science
• Year: 1965
• Tongue: English
• Weight: 761 KB
• Volume: 3
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(65)90063-1

✦ Synopsis

~-Pol~yl~o~de

coke, petroleum coke based carbon and glassy carbon were heat treated at various temperatures under high pressure using a modified anvil type high pressure apparatus. The Iattice spacing c, of polyvinylchloride coke prepared at 68O*C, petroleum coke based carbon calcined at 1100°C and glassy carbon prepared at 700°C was found to change very rapidly around 1400-1500°C with heat treatment under pressure of 10 kbar. The profile of (002) diffraction was found to be complex for the polyvinylchloride coke heat treated at temperaturea in the range of the rapid change of c,. In the cases of polyvinylchloride coke calcined at 1500" and at 2OOO"C, no rapid change of c,, was observed with heat treatment under 10 kbar. The acceleration effect of pressure on graphitization was observable onIy at tempemtures above the temperature of ml&nation for each coke. In the case of glassy carbon, which is a typical non-graph&zing carbon, a graphitic material with c, 6.72 A was obtained after heat treatment at 2500°C under 10 kbar, while this value of c, is never obtained by heat treatment of the glassy carbon even above 3000°C under atmospheric pressure. The c, lattice spacing of graphite obtained by freezing the liquid carbon under 10 kbar was found to be 6.709&0.002

A.