Chemical vapour infiltration of pyrolytic carbon—an electron spin resonance analysis

• Published in: Synthetic metals Vol. 142; no. 1; pp. 13 - 19
• Main Authors: Drescher, M., Guellali, M., Hüttinger, K.J., Dormann, E.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 13-04-2004; Amsterdam Elsevier Science; New York, NY
• Subjects: Chemical vapour infiltration; Cross-disciplinary physics: materials science; rheology; Electron spin resonance; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Materials science; Physics; Specific materials; 76.30.Pk; 68.35.-p; Chemical vapour infiltration; 76.30.Rn; Electron spin resonance; 61.18.Fs; Polarizing microscope; Methane; Scanning electron microscopy; Annealing; Densification; Line shape; Experimental study; Preferred orientation; Carbon fibers; Optical microscopy; Chemical vapor infiltration; Electron paramagnetic resonance; Graphitization
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/S0379-6779(03)00415-6

A carbon fibre felt with a fibre volume fraction of 7% was densified by chemical vapour infiltration of pyrolytic carbon from methane at about 1100
°C using an isothermal, isobaric process. Specimens of 1
mm
3 size were cut out and analysed by electron spin resonance (ESR) in as-infiltrated form and after annealing at 2200 or 2900
°C. The temperature and orientation dependence of ESR line shape, width, intensity, and
g-tensor are derived. Preferred orientation and degree of graphitisation of the deposited pyrolytic carbon are discussed.