Gözenekli Kordiyerit Küre Üretim ve Karakterizasyonu
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Dosyalar
Tarih
2019
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Afyon Kocatepe Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada milimetre boyutlarında küre formunda gözenekli kordiyerit seramiklerinin üretimi ve
karakterizasyon çalışmaları gerçekleştirilmiştir. Kordiyerit küre üretiminde CC31, manyezit ve silika
kullanılmıştır. Üretilen kürelere % 0, 5 ve 10 oranında nişasta ilave edilerek kürelerin farklı oranlarda
gözenek içerecek şekilde üretilmesi sağlanmıştır. Tasarlanan bileşimler 1150 ve 1250C’de 1 saat
süreyle atmosfer koşullarında 10C/dakika ısıtma ve soğutma hızı uygulanarak sinterlenmiştir.
Sinterleme sonrası elde edilen kürelerin içyapı incelemeleri taramalı elektron mikroskobu ve faz
analizleri x−ışını kırınım yöntemi ile gerçekleştirilmiştir. Taramalı elektron mikroskobu incelemeleri
nişastanın yapıdan uzaklaşması sonucunda büyük gözeneklerin oluştuğunu göstermiştir. Ayrıca
1250C’de sinterlenen numunelerde kürelerin dışında ve iç kısmında oluşan içyapıların oldukça farklı
olduğu gözlemlenmiştir. Ayrıca aynı sıcaklıkta sinterlenmesine rağmen nişasta ilavesinin de kürelerin dış
kısmındaki içyapı gelişimine önemli ölçüde etki ettiği belirlenmiştir. Nişasta miktarı azaldıkça 1250C’de
sinterlenen numunelerde kürelerin dışında oluşan kristallerin boy/en oranının arttığı ve daha ince
kristallerin oluştuğu belirlenmiştir.
In this study, production and characterization studies of porous cordierite ceramics beads with millimeter dimensions were performed. CC31, magnesite and silica were used as starting materials for the production of cordierite beads. Bead production was carried out by using 0, 5 and 10 wt.% starch to provide different amount of porosity. Designed beads were sintered at 1150 and 1250C for one hour at atmospheric conditions and 10C/minute heating and cooling rate was applied during the sintering process. The microstructure of the sintered beads was investigated by scanning electron microscopy and phase analysis by x−ray diffraction method. Scanning electron microscopy examinations showed that large pores were formed because of the removal of starch from the structure. It was also observed that the microstructures formed inside and outer surface of the beads were quite different in the samples sintered at 1250C. It was also determined that starch addition, although sintered at the same temperature, had a significant effect on the microstructure development on the outer part of the beads. When the sintering temperature of the beads is 1250C , as the amount of starch decreases, the aspect ratio of the crystals formed at the outside of the beads increases, and finer crystals are formed.
In this study, production and characterization studies of porous cordierite ceramics beads with millimeter dimensions were performed. CC31, magnesite and silica were used as starting materials for the production of cordierite beads. Bead production was carried out by using 0, 5 and 10 wt.% starch to provide different amount of porosity. Designed beads were sintered at 1150 and 1250C for one hour at atmospheric conditions and 10C/minute heating and cooling rate was applied during the sintering process. The microstructure of the sintered beads was investigated by scanning electron microscopy and phase analysis by x−ray diffraction method. Scanning electron microscopy examinations showed that large pores were formed because of the removal of starch from the structure. It was also observed that the microstructures formed inside and outer surface of the beads were quite different in the samples sintered at 1250C. It was also determined that starch addition, although sintered at the same temperature, had a significant effect on the microstructure development on the outer part of the beads. When the sintering temperature of the beads is 1250C , as the amount of starch decreases, the aspect ratio of the crystals formed at the outside of the beads increases, and finer crystals are formed.
Açıklama
Anahtar Kelimeler
Gözenekli seramikler, Kordiyerit, Küre, Kristal boy/en oranı, Nişasta, Porous ceramics, Cordierite, Bead, Crystalline aspect ratio, Starch
Kaynak
Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi
WoS Q Değeri
Scopus Q Değeri
Cilt
19
Sayı
Özel Sayı
