Wetting and interfacial phenomena in Ni-Cr-Hf/sapphire systems |
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| Affiliation: | 1. CNR-ICMATE - National Research Council – Institute of Condensed Matter Chemistry and Technologies for Energy, 6 de Marini, 16149, Genoa, Italy;2. Lukasiewicz Research Network - Foundry Research Institute, 73 Zakopianska, 30-418, Krakow, Poland;3. Lukasiewicz Research Network - Institute of Precision Mechanics, Duchnicka 3 Str., 01-796 Warsaw, Poland;4. AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland;5. UNIGE – DCCI – University of Genova – Department of Chemistry and Industrial Chemistry, 31 Dodecaneso, 16146, Genoa, Italy;1. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006, Badajoz, Spain;2. Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, Madrid, 28049, Spain;1. Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968, USA;2. Wollongong Isotope Geochronology Laboratory, School of Earth and Environmental Sciences, University of Wollongong, NSW 2522, Australia;3. Institut de Physique du Globe de Paris, France;4. Department of Earth Sciences, Dickinson College, Carlisle, PA 17013, USA;5. Earth and Environmental Systems Institute, Pennsylvania State University, State College, PA 16802, USA;1. Institute of Solid State Chemistry and Mechanochemistry SB RAS, 18 Kutateladze st., Novosibirsk 630128, Russia;2. Novosibirsk State University, 1 Pirogova st., Novosibirsk 630090, Russia |
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| Abstract: | The wetting of Ni-Hf and Ni-Cr-Hf alloys on sapphire has been studied in this work. Sapphire represents a “simple” and ideal case adopted for better understanding the basic phenomena involved in liquid/solid contact during casting of Ni-based superalloys. Wettability tests were performed by means of the sessile drop method at 1500 °C; moreover, after a certain time of liquid/solid contact, the liquid drop was pushed out from the substrate in order to open the interface and to investigate what happened at the interface. The characterization was performed by SEM/EDS and confocal microscopy in order to check the final interfacial structure. The results are discussed in terms of chemical interactions and by means of ad-hoc calculated phase diagrams. Hf present in Ni-based melts strongly reacted with sapphire forming HfO2 layers and inclusions; on the other hand, Cr decreased the contact angles of Ni melts without forming interfacial layers during liquid/solid contact. |
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| Keywords: | Wetting Casting Ni-alloys Metal/Ceramic interfaces |
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