| タイトル | Issues on Fabrication and Evaluation of SiC/SiC Tubes With Various Fiber Architectures |
| 本文（外部サイト） | http://hdl.handle.net/2060/20040141398 |
| 著者（英） | Yun, H. M.; DiCarlo, J. A.; Fox, D. S. |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2004-09-01 |
| 言語 | eng |
| 内容記述 | SiC/SiC engine components, high-modulus Sylramic-iBN SiC fiber tows were used to form nine different tubular architectural preforms with 13 mm (0.5 in.) inner diameter and lengths of approx. 75 and 230 mm (approx. 3 and approx, 9 in.). The thin-walled preforms were then coated with a BN interphase and densified with a hybrid SiC matrix using nearly the same process steps previously established for slurry-cast melt-infiltrated Sylramic-iBN/BN/SiC flat panels. The as-fabricated CMC tubes were microstructurally evaluated and tested for tensile hoop and flexural behavior, and some of the tubes were also tested in a low-pressure burner rig test with a high thru-thickness thermal gradient. To date, four general tube scale-up issues have been identified: greater CVI deposits on outer wall than inner wall; increased ply thickness and reduced fiber fraction; poor test standards for accurately determining the hoop strength of a small-diameter tube; and poor hoop strength for architectures with seams or ply ends. The underlying mechanisms and possible methods for their minimization are discussed. |
| NASA分類 | Solid-State Physics |
| レポートNO | NASA/TM-2004-213335
E-14805 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/221351 |
