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5394 |
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Friday, June 09, 2017, Hall 12 11:20 AM Power Generation - Steam |
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Amorphous thermal spray coatings to extend life of boiler tubes |
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Evelina Vogli* / Liquid Metal Group Holdings, United States of America Paul Kim / LiquidMetal Group Holdings, USA John Kang/ LiquidMetal Group Holdings, USA Rick Salas/ LiquidMetal Group Holdings, USA |
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Boiler tube failure is the number one source of forced outages in all coal-fired and biomass0fired power generation plants. It is estimated that plants lose approximately 6% of their power generation annually, due to boiler tube leaks. The major causes for premature tube failure are excessive fireside boiler tube erosion and corrosion caused by impact, abrasive wear, oxidation and molten corrosion of low eutectic alloys. LiquidMetal Coatings has developed an amorphous metal alloy composition from its unique amorphous coatings family that has a similar thermal expansion coefficient with carbon steel eliminating the risk of spallation and offer extraordinary high erosion and corrosion resistance under severe conditions in boiler tubes. Amorphous metals are a new class of materials that have a disordered, non-crystalline, glassy structure, that are created when metals or their alloys are either cooled very quickly or because of an alloy combination, bypassing crystallization during solidification. Due to their unique microstructure, amorphous metals combine ultrahigh strength, high hardness and ductility in one single structure. They are more corrosion resistant compared to conventional metals due to the lack of long-range periodicity, related grain boundaries and crystal defects such as dislocations. In addition, they are stronger than crystalline metals and they can sustain larger reversible deformations than crystalline alloys. |