| タイトル | Role of interfacial carbon layer in the thermal diffusivity/conductivity of silicon carbide fiber-reinforced reaction-bonded silicon nitride matrix composites |
| 著者（英） | Donaldson, Kimberly Y.; Bhatt, Hemanshu; Bhatt, Ramakrishna T.; Hasselman, D. P. H. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1992-02-01 |
| 言語 | eng |
| 内容記述 | Experiments were carried out on samples of reaction-bonded silicon nitride uniaxially reinforced by SiC monofilaments with and without a 3-micron-thick carbon-rich coating. It is found that a combination of a carbon coatings on the fibers and an interfacial gap due to the thermal expansion mismatch in the composite can significantly (by a factor of 2) lower the effective thermal diffusivity in the direction transverse to the fiber. At atmospheric pressure, gaseous conduction across the interfacial gap makes a significant contribution to the heat transfer across the interface, indicated by significantly lower values of the effective thermal diffusivity under vacuum than in nitrogen or helium at atmospheric pressure. |
| NASA分類 | COMPOSITE MATERIALS |
| レポートNO | 92A25443 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/329281 |
