Corrosion resistant amorphous metals and methods of forming corrosion resistant amorphous metals
| DWPI Title: Surface, e.g. surface of containers, coating involves applying binding metal and particles to the surface by spray or deposition process |
| Abstract: A system for coating a surface comprises providing a source of amorphous metal, providing ceramic particles, and applying the amorphous metal and the ceramic particles to the surface by a spray. The coating comprises a composite material made of amorphous metal that contains one or more of the following elements in the specified range of composition: yttrium (≧1 atomic %), chromium (14 to 18 atomic %), molybdenum (≧7 atomic %), tungsten (≧1 atomic %), boron (≰5 atomic %), or carbon (≧4 atomic %). |
| Use: The method is used for coating surface, e.g. surface of containers for the transportation and long-term storage of high-level radioactive waste (HLW) spent nuclear fuel (SNF), or to protect welds and heat affected zones. |
| Advantage: The coating method is capable of preventing exposure of, e.g. container surface to environments that might cause stress corrosion cracking. The particles improve the hardness and wear resistance of the thermal-spray coating. The ceramic particles in the corrosion-resistant amorphous-metal binder phase forms a coating system wherein fracture is mitigated by the interruption of propagating shear bands and fractures in the amorphous metal, thus lowering the overall susceptibility to fracture. The particles increase the functionality of amorphous metal coatings, e.g. the inclusion of boride particles in thermal spray coatings of amorphous metals can increase the neutron absorption cross-section of the coatings, thus making them more desirable for criticality control applications (nuclear criticality) than would be possible with a simple amorphous metal. |
| Novelty: Surface coating involves providing sources of binding metal and particles, and applying the binding metal and particles to the surface by spray or deposition process. The applying step is spray or deposition process by spraying alternating layers to the surface, flame spray processing, plasma spray processing, high-velocity oxy-fuel spray processing, high-velocity air-spray processing, detonation gun processing, or thermal spray processing. |
| Filed: 10/1/2009 |
| Application Number: US2009571535A |
| Tech ID: SD 12618.3 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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