| タイトル | Effect of hydrogen exposure on a Cu-8 Cr-4 Nb alloy |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940019083 |
| 著者（英） | Dreshfield, Robert L.; Misra, Ajay K.; Ellis, David L. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1993-12-01 |
| 言語 | eng |
| 内容記述 | The advanced regeneratively cooled rocket thrust chamber may require new materials to achieve long life and improved performance. Current materials such as NARloy-Z (Cu-3 wt. percent Ag-0.5 wt. percent Zr), while highly conductive, do not have sufficient high temperature strength and creep resistance to meet the projected needs of advanced rocket motors. A Cu-8 at. percent Cr-4 at. percent Nb (Cu-8 Cr-4 Nb) alloy has been identified as a promising material for this application. However, hydrogen embrittlement is a concern given the presence of high pressure, high temperature hydrogen in regeneratively cooled rocket motors. Thermodynamic analysis of the reaction between Cr-rich Cr2Nb and H2 showed that there is a possibility of reaction at temperatures up to 323 K in a 35 MPa H2 environment. Above 323 K the pressure necessary to achieve reaction rapidly increased beyond the range experienced in rocket motors. Tensile specimens exposed in 34.5 MPa H2 at room temperatures and during cycling to 705 C did not show any degradation of properties. No evidence of reaction was observed for Cr2Nb precipitate observed on the fracture surfaces. Based on these results the Cu-8 Cr-4 Nb alloy was judged to be sufficiently stable for use in rocket motors. |
| NASA分類 | METALLIC MATERIALS |
| レポートNO | 94N23556
NASA-TM-106429
E-8271
NAS 1.15:106429 |
| 権利 | No Copyright |
