Seryum Oksit Katkılı Doğal Obsidyen Camların Mekanik Özellikleri

Year 2019, Volume: 8 Issue: 2, 165 - 173, 29.12.2019

Bülent Aktaş , Şerife Yalçın , Abuzer Açıkgöz , Rahime Şerbetçi

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

Cited By: 1

Abstract

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.

Keywords

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

Mechanical Properties of Natural Obsidian Glasses Doped with Cerium Oxide

Abstract

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.

Keywords

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

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