Micro-Raman Study on Structure Evolution of Graphite Exposed to Intense Thermal Shock Load
| Periodical | Advanced Materials Research (Volume 59) |
|---|---|
| Main Theme | 1st International Conference On New Materials for Extreme Environment |
| Edited by | Ch. Linsmeier and M. Reinelt |
| Pages | 66-70 |
| DOI | 10.4028/www.scientific.net/AMR.59.66 |
| Citation | Takeshi Hirai et al., 2008, Advanced Materials Research, 59, 66 |
| Online since | December, 2008 |
| Authors | Takeshi Hirai, Jeremie Compan, Keisuke Niwase |
| Keywords | Amorphous Carbon, Graphite, Raman Spectroscopy, Thermal Shock |
| Price | US$ 28,- |
A small area of a fine grain graphite block was exposed to intense thermal shock load at 9.6 GW/m2 and investigated by micro-Raman spectroscopy. Raman spectra of the loaded area show a reduction of the intensity ratio of D and G peaks in comparison with the one of unloaded graphite, indicating the ordering of graphitic structure even for as short as 5 ms. Raman spectra of the surrounding area, on the other hand, exhibited broad features of amorphous carbon, indicating a carbon deposits from the loaded area. The broad spectra showed a strong positional dependence, reflecting the temperature gradient of the block induced by the shock load. Fitting analysis of the Raman spectra clearly shows two linear relationships between the G-peak width (FWHMG) and the peak intensity ratio (ID / IG), corresponding to two steps of ordering process of the amorphous carbon deposits.