Kinetics of deposition of pyrolytic carbon films from methane and carbon suboxide
β Scribed by T.J Hirt; H.B Palmer
- Publisher
- Elsevier Science
- Year
- 1963
- Tongue
- English
- Weight
- 620 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
β¦ Synopsis
Using an isothermal flow reactor of annular configuration, the rates of carbon deposition from CH4 and C,O, have been measured over the respective temperature ranges, 1168Β°-13720K and 900"-1025Β°K. Under the experimental conditions employed, deposition from both of these compounds is found to be controlled by their rates of unimolecular decomposition in the gas phase. Carbon deposition from CsOs is inhibited by CO, in accordance with the postulated mechanism for CsOs *Based on the dissertation of T. J. HIRT for the degree of Ph.D. in fuel technology, (December 1962). The research was supported by the U.S. Atomic Energy Commission, Contract AT(30-l)-1710.
π SIMILAR VOLUMES
The influence of the contact tinle and the surface-to-volume ratio (S/l') in thr reaction zone on pyrolytic carbon formation was investigated during methane pyrol) sis in a flow system. The experiments were carried out within the temperature inter\ al of 815-llOO"C, the S/V ratio ranging from 1.5,'c
a-Boron-containing pyrocarbons were prepared at temperatures 1400-1650Β°C by simultaneous pyrolytic deposition from gas mixtures containing CH, and BCI, on an induction heated graphite substrate. The deposits thus prepared with boron content in the range O-3 per cent (w/o) were investigated using X-r
York). A simple model of the deposition of pyrolytic carbon is proposed to explain the apparent inconsistencies between properties and structure. This model considers the importance of the nucleation rate, diffusion, and surface reactions and is based on structure determinations by density and stres
## ABSTRACTS that the shape and sharpness of the three-dimensional ( 101) and ( 112) reflection, respectively, are considerably developed with time, whereas the mean interlayer spacing as determined by the (004) line is not changed significantly for holding times longer than 15 min.