Effect of high temperature preoxidation treatment on the oxidation behavior of MoSi2 - and WSi2 -Al2O3 composites

Basit Öğe Kaydı
dc.contributor.authorYakaboylu, Gunes A.
dc.contributor.authorYumak, Tugrul
dc.contributor.authorSabolsky, Katarzyna
dc.contributor.authorSabolsky, Edward M.
dc.date.accessioned2025-03-23T19:41:18Z
dc.date.available2025-03-23T19:41:18Z
dc.date.issued2020
dc.departmentSinop Üniversitesi
dc.description.abstractComposites of 30 vol% MoSi2 -70 vol% Al2O3 and 30 vol% WSi2-70 vol% Al2O3 were prepared via sintering at 1600 degrees C in argon. The high-temperature preoxidation treatments were applied at 1000 degrees-1200 degrees C for 10 - 120 min in air. The non-isothermal oxidation tests were conducted in air at temperatures ranging between 50 degrees and 870 degrees C to study and understand the influence of the alumina phase and preoxidation process on the low-temperature oxidation behavior. The optical and scanning electron microscopy, X-ray diffraction, X-ray photoelectron and Raman spectroscopy were used to characterize the surface layers formed. The oxidation-induced mass gains were substantially reduced by 82.1-99.8%, implying their enhanced oxidation resistance. This was due to the formation of highly dense, protective surface layers with a sufficient thickness (3.1-14.2 mu m). The structural and surface analyses revealed their complex chemistries, since the ternary (Mo-Si-Al, W-Si-Al) intermetallic, mullite, alumina and silica phases with high oxidation resistances were identified within these surface features. In addition, the high-temperature electrical properties of the composites were highly preserved after the preoxidation treatment, and their electrical conductivities were measured as 45.1-78.6 S/cm at 800 degrees C and 40.1 - 69.1 S/cm at 900 degrees C. (C) 2019 Elsevier B.V. All rights reserved.
dc.description.sponsorshipU.S. Department of Energy, National Energy Technology Laboratory [DE-FE0012383]; Scientific and Technological Research Council of Turkey (TUBITAK) [BIDEB-2219]
dc.description.sponsorshipThis research was funded by the U.S. Department of Energy, National Energy Technology Laboratory under contract DE-FE0012383. The authors greatly appreciate the guidance of Dr. Maria Reidpath from the U.S. Department of Energy. We acknowledge use of the WVU Shared Research Facilities. Dr. Yumak also acknowledges the financial support from the Scientific and Technological Research Council of Turkey (TUBITAK) under BIDEB-2219 Postdoctoral Research Program.
dc.identifier.doi10.1016/j.jallcom.2019.152499
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85073744584
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2019.152499
dc.identifier.urihttps://hdl.handle.net/11486/6550
dc.identifier.volume816
dc.identifier.wosWOS:000503725300040
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Sa
dc.relation.ispartofJournal of Alloys and Compounds
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20250323
dc.subjectMolybdenum silicide
dc.subjectTungsten silicide
dc.subjectIntermetallics
dc.subjectPest oxidation
dc.subjectSurface layer
dc.titleEffect of high temperature preoxidation treatment on the oxidation behavior of MoSi2 - and WSi2 -Al2O3 composites
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu