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- W3127210147 abstract "In this work, Ni50Al50 alloy is taken into consideration as potential brazing material for joining ZrB2 ultra-high temperature ceramic. The results of experimental study on high temperature interfacial phenomena between molten binary Ni50Al50 alloy and polycrystalline ZrB2, are shown. A sessile drop method combined with a capillary purification procedure was applied to investigate the wetting behavior of Ni50Al50/ZrB2 couple during holding for 400 seconds at temperature of 1688{deg}C (i.e. at T=1.02Tm). It was found that the molten Ni50Al50 rapidly wets and spreads over the surface of ZrB2, while involved reactive infiltration into the solid substrate allowed reaching a final contact angle of ~0{deg} in 250 sec. The wetting kinetics was much faster than that reported in the literature for Cu, Ag or Au tested at T=1.05Tm. The solidified couple was subjected to SEM/EDS microstructural characterization in order to reveal a course of interfacial phenomena. The results point towards (I) an existence of Ni-enriched Ni-Al/ZrB2 surface interfacial layer; (II) a formation of infiltration zone assisted by reactively formed Al2O3 due to a reaction with Al-rich melt and (III) a partial transfer of ZrB2 phase to Ni50Al50 alloy by a dissolution/precipitation mechanism." @default.
- W3127210147 created "2021-02-15" @default.
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- W3127210147 date "2021-01-29" @default.
- W3127210147 modified "2023-09-27" @default.
- W3127210147 title "High temperature interaction between molten Ni50Al50 alloy and ZrB2 ultra-high temperature ceramics" @default.
- W3127210147 hasPublicationYear "2021" @default.
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