Seryum Oksit Katkılı Doğal Obsidyen Camların Mekanik Özellikleri

Yıl 2019, , 165 - 173, 29.12.2019

Bülent Aktaş , Şerife Yalçın , Abuzer Açıkgöz , Rahime Şerbetçi

https://doi.org/10.17100/nevbiltek.499070

Cited By: 1

Öz

Bu
çalışmanın amacı, seryum oksidin (ağırlıkça %0,5-10 CeO₂)
eklenmesiyle yüksek mekanik özelliklere sahip doğal obsidyen camların
üretilmesidir. Obsidyen cam örnekleri geleneksel ergitme metodu ile 1300
^oC de 2 saat bekletilerek üretilmiştir. Saf
ve CeO₂ katkılı obsidyen örneklerinin yoğunluğu Arşimet prensibi ile
belirlenmiştir. Numunelerin sertlik ve kırılma tokluğu, Micro-Vickers çentik
testi kullanılarak ölçülmüştür. CeO₂ katkılı obsidyen camın XRD desenleri,
tüm CeO₂ katkılarında silikon oksit içerdiğini göstermiştir. CeO₂
ilavesi ile obsidyen camın yoğunluğu artmıştır. Mekanik test sonuçları CeO₂'nin
obsidyene %1'e kadar ilave edilmesinin sertlikte hafif bir artışa neden
olduğunu gösterdi. Ayrıca, obsidyen cam numunelerinin kırılma tokluğu,
ağırlıkça %5 CeO₂ ilave edilerek 1,65 ila 1,91 MPa.m^0,5 arasında
değişmiştir.  Böylece, obsidyen camların
mekanik özellikleri CeO₂ ilavesiyle arttırılabilir.

Anahtar Kelimeler

Doğal obsidyen cam, Seryum oksit (CeO2), Sertlik, Kırılma tokluğu

Mechanical Properties of Natural Obsidian Glasses Doped with Cerium Oxide

Öz

The objective of this study was to manufacture the
natural obsidian glasses, which have high mechanical properties with adding of
Cerium oxide at 0.5–10 wt.% CeO₂ to obsidian glass. Obsidian glass
samples were produced by conventional melting method at 1300 ^oC for
2h. The densities of pure and CeO₂-added obsidian glass samples were
determined by Archimedes' principle. The Hardness and fracture toughness of
samples were measured using Micro-Vickers indentation tests. XRD patterns of
obsidian glass added with CeO₂ showed that all CeO₂ added
samples included silicon oxide. The density of obsidian glass increased with CeO₂
addition. The mechanical test results showed that CeO₂ addition up
to 1wt.% content to the obsidian caused a slightly increase in the hardness.
Further, fracture toughness of obsidian glass samples changed from 1.65 to 1.91
MPa∙m^0.5 with 5 wt.% CeO₂ addition. As a result, it was
found that the mechanical properties of the obsidian glasses could be enhanced
through CeO₂ addition.

Anahtar Kelimeler

Natural obsidian glass, Cerium Oxide (CeO2), Hardness, Fracture toughness

Kaynakça

• Morgan L.E., Renne P.R., Taylor R.E. and Gabriel G.W. “Archaeological age constraints from extrusion ages of obsidian: Examples from the Middle Awash, Ethiopia,” Quaternary Geochronology 193-203, 2009
• Bourdonnec F.L., Bontempi J.M., Marini N., Mazet S., Neuville P.F., Poupeau G. and Sicurani J. “SEM-EDS characterization of western Mediterranean obsidians and the Neolithic site of A Furta (Corsica),” Journal of Archaeological Science,37, 92-106, 2010
• Glascock M.D., "Obsidian provenance research in the Americas." Accounts of chemical research, 35(8) 611-617, 2002
• Nazaroff A.J., Prufer K. M., and Drake B. L., “Assessing the applicability of portable X-ray fluorescence spectrometry for obsidian provenance research in the Maya lowlands,” Journal of Archaeological Science, 37 885-895, 2010
• Derkowski, A. "Experimental transformation of volcanic glass from Streda nad Bodrogom (SE Slovakia)." Geologica Carpatica, 53, 2002.
• Negash A., Alene M., Brown F.H., Nash B.P. and Shackley M.S. “Geochemical sources for the terminal Pleistocene/early Holocene obsidian artefacts of the site of Beseka, central Ethiopia,” Journal of Archaeological Science, 34, 1205-1210, 2007
• Smith C. S. "Obsidian use in Wyoming and the concept of curation." Plains Anthropologist, 44(169), 271-291, 1999
• Negash A. and Shackley M.S. “Geochemical Provenance of Obsidian Artefacts from the MSA site of Proc Epic Ethiopia,” Archaeometry, 48, 1-12, 2006
• Abdelounisa H.B., Elleuch K., Vargiolu R., Zahouani H. and Bot A.L. “On the behaviour of obsidian under scratch test,” Wear, 266, 621-626, 2009
• Dorfman B.F. “Obsidian-Natural Nanostructured Glass: Preliminary Research Results”, Proceedings of the XIth International Congress and Exposition, 2008 pp. 1876-1885
• Husien M.S. “Fracture Behavior and Mechanical Characterization of Obsidian: Naturally Occurring Glass” Master Thesis, Oklahoma State University, 2010
• Anstis G.R., Chantikul P., Lawn B.R. & Marshall D.B. “A critical evaluation of indentation techniques for measuring fracture toughness: I, direct crack measurements,” Journal of the American Ceramic Society, 64(9), 533-538, 1981
• Aktas, B., Albaskara, M., Dogru, K., & Yalcin, S., “Mechanical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder”, Acta Physica Polonica A, 132(3), 436-438. 2017