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Electrode erosion in steady-state electric propulsion engines
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pivirotto, Thomas J. Deininger, William D. |
| Copyright Year | 1988 |
| Description | The anode and cathode of a 30 kW class arcjet engine were sectioned and analyzed. This arcjet was operated for a total time of 573 hr at power levels between 25 and 30 kW with ammonia at flow rates of 0.25 and 0.27 gm/s. The accumulated run time was sufficient to clearly establish erosion patterns and their causes. The type of electron emission from various parts of the cathode surface was made clear by scanning electron microscope analysis. A scanning electron microscope was used to study recrystallization on the hot anode surface. These electrodes were made of 2 percent thoriated tungsten and the surface thorium content and gradient perpendicular to the surfaces was determined by quantitative microprobe analysis. The results of this material analysis on the electrodes and recommendations for improving electrode operational life time are presented. |
| File Size | 625576 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890018384 |
| Archival Resource Key | ark:/13960/t6tx8755s |
| Language | English |
| Publisher Date | 1988-01-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Electrodes Plasma Propulsion Recrystallization Arc Jet Engines Thorium Alloys Electron Emission Rocket Engine Design Steady State Erosion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
