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Performance of coated columbium and tantalum alloys in plasma arc reentry simulation tests
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Levine, S. R. Merutka, J. P. |
| Copyright Year | 1974 |
| Description | The evaluation of coated refractory metals screened in stagnation model plasma arc tests is reported. Columbium alloys FS-85, C-129Y, and Cb-752 coated with Si-20Cr-20Fe (R512E) were tested at 1390 C. Three silicide coatings on Ta-10W were tested at 1470 C. Half-hour cycles and a 6500 N/sqm stagnation pressure were used. The best R512E coated columbium alloy was FS-85 with first local coating breakdowns occurring in 12 to 50 cycles. At coating defects, low metal recession rates (0.005 mm/min) were generally observed on coated columbium alloys while high rates (0.15 mm/min) were observed on coated Ta-10W. Coated columbium suffered large emittance losses (to below 0.7) due to surface refractory metal pentoxide formation. |
| File Size | 8703357 |
| Page Count | 51 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740015000 |
| Archival Resource Key | ark:/13960/t9n34mr8w |
| Language | English |
| Publisher Date | 1974-05-01 |
| Access Restriction | Open |
| Subject Keyword | Materials, Metallic Metal Coatings Tantalum Alloys Plasma Jets Thermal Protection Silicides Simulation Niobium Alloys Oxidation Atmospheric Entry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
