Lime-Based Plasma Spray Coatings on Steelmaking Nozzles
During continuous casting of aluminum-killed steels, alumina accretions frequently form on the refractory nozzle wall obstructing the flow of steel. Accretions are typically composed of small micron sized alumina particles that attach to the nozzle wall and form a powdery friable alumina layer. Researchers report that the alumina densifies at the nozzle interface resulting in a dense alumina layer between the powdery layer and the nozzle refractory (see Figure 1 for a typical accretion structure)(1). In some cases, portions of the accretion layer detach and enter the steel stream, which can degrade steel quality. In other cases, the accretion grows throughout the casting sequence, decreasing the flowrate until eventually the nozzle must be replaced.
J. D. Smith et al., "Lime-Based Plasma Spray Coatings on Steelmaking Nozzles," Proceedings of the 4th International Surface Engineering Congress, ASM International, Jan 2005.
Materials Science and Engineering
Peaslee Steel Manufacturing Research Center
American Iron and Steel Institute
United States. Department of Energy
Keywords and Phrases
Aluminum; Lime Plasma Coating
Article - Conference proceedings
© 2005 ASM International, All rights reserved.
01 Jan 2005