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High temperature barrier coatings for refractory metals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Malone, G. A. Walech, T. |
| Copyright Year | 1995 |
| Description | Improvements in high temperature oxidation resistant metal coating technology will allow NASA and commercial entities to develop competitive civil space transport and communication systems. The success of investigations completed in this program will have a positive impact on broadening the technology base for high temperature materials. The work reported herein describes processes and procedures for successfully depositing coherent oxidation barrier coatings on refractory metals to prevent degradation under very severe operating environments. Application of the new technology developed is now being utilized in numerous Phase 3 applications through several prominent aerospace firms. Major achievements have included: (1) development of means to deposit thick platinum and rhodium coatings with lower stress and fewer microcracks than could be previously achieved; (2) development of processes to deposit thick adherent coatings of platinum group metals on refractory substrates that remain bonded through high temperature excursions and without need for intermediate coatings (bonding processes unique to specific refractory metals and alloys have been defined; (3) demonstration that useful alloys of refractory and platinum coatings can be made through thermal diffusion means; (4) demonstration that selected barrier coatings on refractory substrates can withstand severe oxidizing environments in the range of 1260 deg and 1760 deg C for long time periods essential to the life requirements of the hardware; and (5) successful application of the processes and procedures to prototype hardware. The results of these studies have been instrumental in improved thermal oxidation barrier coatings for the NASP propulsion system. Other Phase 3 applications currently being exploited include small uncooled thrusters for spacecraft and microsatellite maneuvering systems. |
| File Size | 9843285 |
| Page Count | 136 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950024110 |
| Archival Resource Key | ark:/13960/t6h17z69q |
| Language | English |
| Publisher Date | 1995-06-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Microcracks Refractory Metals Spacecraft Construction Materials Substrates Metal Coatings Oxidation Resistance Thermal Protection Thermal Control Coatings Rhodium Platinum Refractory Metal Alloys Plating Electrodeposition Iridium Metal-metal Bonding Protective Coatings Refractory Coatings Deposition 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 |
