| タイトル | Fabrication and testing of carbon-carbon grids for ion optics |
| 著者（英） | Brophy, John R.; Garner, Charles E. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1992-07-01 |
| 言語 | eng |
| 内容記述 | Ion optics measuring 16.5 cm in diameter and 1.0 mm in thickness were fabricated from carbon-carbon composites that were woven from a high-tensile-modulus carbon fiber. Plate flatness varied by less than 0.05 mm. Several methods were investigated for forming ion-extraction apertures in the carbon-carbon plates, including laser machining, mechanical drilling, and conventional electric discharge machining. Tests conducted using a quartz dilatometer indicated that the coefficient of thermal expansion of the carbon-carbon plates varied between -0.51 to -1.8 x 10 exp -6/degree C at plate temperatures between 173-773 K. Sputter-erosion experiments indicate that carbon-carbon erodes at a rate approximately 25 percent below molybdenum under the same conditions. These material properties indicate that carbon-carbon may be superior to molybdenum for use as ion optics electrodes for ion engines. |
| NASA分類 | SPACECRAFT PROPULSION AND POWER |
| レポートNO | 92A48777
AIAA PAPER 92-3149 |
| 権利 | Copyright |
