Preoxidation Study of Fe-Ni-Co (KOVAR) Alloy on Glass to Metal Sealing Performance, M.Sc. Thesis Sharif University of Technology ; Askari, Masoud (Supervisor) ; Kaflou, Ali (Supervisor)
Abstract
The Fe-Ni-Co alloy to borosilicate glass seals have been used for many years as hermetic and electrically insulating seals. It is not only excellent in thermal expansion matching but also in good wettability and bond strength too. Oxidation of Kovar was performed in Water vapor, Saturated Nitrogen and N2-H2-H2O atmosphere in tube furnace. Oxide layer composition and thickness changed by varying in oxidation temperature and time. XRD analysis showed different Iron oxides in oxide layer, FeO, Fe3O4 and Fe2O3. However in the third atmosphere no Hematite observed. Increasing oxidation temperature and time result in increasing sample weight gains and roughness. Oxide layer microstructure also was...
Cataloging briefPreoxidation Study of Fe-Ni-Co (KOVAR) Alloy on Glass to Metal Sealing Performance, M.Sc. Thesis Sharif University of Technology ; Askari, Masoud (Supervisor) ; Kaflou, Ali (Supervisor)
Abstract
The Fe-Ni-Co alloy to borosilicate glass seals have been used for many years as hermetic and electrically insulating seals. It is not only excellent in thermal expansion matching but also in good wettability and bond strength too. Oxidation of Kovar was performed in Water vapor, Saturated Nitrogen and N2-H2-H2O atmosphere in tube furnace. Oxide layer composition and thickness changed by varying in oxidation temperature and time. XRD analysis showed different Iron oxides in oxide layer, FeO, Fe3O4 and Fe2O3. However in the third atmosphere no Hematite observed. Increasing oxidation temperature and time result in increasing sample weight gains and roughness. Oxide layer microstructure also was...
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