Wetting and interfacial phenomena in Ni-Cr-Hf/sapphire systems
| Autor: | Gabriele Cacciamani, Saverio Sitzia, Natalia Sobczak, Maria Luigia Muolo, Jerzy Sobczak, Fabrizio Valenza, Rafal Nowak, Alberto Passerone |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
wetting Materials science 02 engineering and technology Substrate (electronics) Metal/ceramic interfaces Wetting Casting Ni-alloys Metal/Ceramic interfaces 021001 nanoscience & nanotechnology 01 natural sciences Casting Superalloy Contact angle casting Sessile drop technique 0103 physical sciences Materials Chemistry Ceramics and Composites Sapphire Ni-alloys Wetting Composite material 0210 nano-technology Phase diagram |
| Zdroj: | Journal of the European Ceramic Society 40 (2020): 521–528. doi:10.1016/j.jeurceramsoc.2019.10.007 info:cnr-pdr/source/autori:Valenza F.; Sobczak N.; Sobczak J.; Nowak R.; Muolo M.L.; Passerone A.; Sitzia S.; Cacciamani G./titolo:Wetting and interfacial phenomena in Ni-Cr-Hf%2Fsapphire systems/doi:10.1016%2Fj.jeurceramsoc.2019.10.007/rivista:Journal of the European Ceramic Society/anno:2020/pagina_da:521/pagina_a:528/intervallo_pagine:521–528/volume:40 |
| DOI: | 10.1016/j.jeurceramsoc.2019.10.007 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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