| タイトル | Effect of a BN Interphase that Debonds Between the Interphase and the Matrix In SiC/SiC Composites |
| 本文（外部サイト） | http://hdl.handle.net/2060/20030022679 |
| 著者（英） | Thomas-Ogbuji, Linus; Morscher, Gregory N.; DiCarlo, James A.; Yun, Hee Mann |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2002-01-01 |
| 言語 | eng |
| 内容記述 | Typically, the debonding and sliding interface enabling fiber pullout for silicon-carbide fiber-reinforced silicon-carbide matrix composites with BN-based interphases occurs between the fiber and the interphase. Recently, composites have been fabricated where interface debonding and sliding occurs between the BN interphase and the matrix. This results in two major improvements in mechanical properties. First, significantly higher failure strains were attained due to the lower interfacial shear strength with no real loss in ultimate strength properties of the composites. Second, significantly longer stress-rupture times at higher stresses were observed in air at 815 C. In addition, no real loss in mechanical properties was observed for composites that did not possess a thin carbon layer between the fiber and the interphase when subjected to burner-rig exposure. Outside debonding is hypothesized to be due to two primary factors: a weaker interface at the BN/matrix interface than the fiber BN interface and a residual tensile/shear stress-state at the interface of melt-infiltrated composites. Also, the occurrence of outside debonding was believed to occur during composite fabrication, i.e., on cool down after molten silicon infiltration. |
| NASA分類 | Composite Materials |
| レポートNO | E-13675 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/223578 |
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