Isıl İşlem Parametrelerinin Lityum Disilikat-Wollastonit Esaslı Cam-Seramiklerin Kristallenme Davranışı ve Özellikleri Üzerine Olan Etkisinin İncelenmesi

Year 2023, , 1507 - 1515, 28.12.2023

Berk Hasırcı , Bahadır Aydın , Hüseyin Özkan Toplan , Nil Toplan

https://doi.org/10.35414/akufemubid.1281106

Abstract

Bu çalışmanın temel amacı, uygulanan ısıl işlem parametrelerinin Li2O-SiO2-CaO-K2O-Al2O3-P2O5 sisteminden döküm yoluyla elde edilen lityum disilikat-wollastonit esaslı cam-seramiklerin kristallenme davranışı, mikroyapısı, fiziksel ve mekanik özellikleri üzerine olan etkilerini değerlendirmektir. Cam seramik numunelerin faz içeriği ve mikroyapısı, X-ışını difraktometresi (XRD), taramalı elektron mikroskobu (SEM) ve EDS analizleri ile karakterize edilmiştir. Numunelerin bulk yoğunlukları Arşimet prensibi ile belirlenirken mekanik özellikler bir Vickers mikrosertlik test cihazı kullanılarak ölçülmüştür. XRD analizleri 850°C’de 5 saat süreyle gerçekleştirilen ısıl işlemler neticesinde lityum disilikat (Li2Si2O5 ) ve wollastonit (CaSiO3 ) fazlarının camların kristalizasyon işleminden sonra yapıda gelişen temel kristal fazlar olduğunu göstermiştir. SEM analizleri ayrıca cam-seramiklerin mikroyapılarının yüzeyden merkeze doğru büyüme eğilimi gösteren çubuksu lityum disilikat ve lamelar wollastonit kristallerinden oluştuğunu ve kristalit boyutunun artan ısıl işlem sıcaklığı ve süreleri ile artma eğiliminde olduğunu ortaya koymuştur. Isıl işlem sıcaklıkları ve sürelerinin artması ayrıca kristalinitenin gelişmesi ile sonuçlanırken, 800°C’de 5 saatlik ısıl işlem parametresinde optimum mekanik özellikler ve yoğunluk değerleri elde edilmiştir.

Keywords

Lityum disilikat, Wollastonit, Cam-seramik, Mekanik özellikler, Mikroyapı

Effect of Heat-treatment Parameters on Crystallization Behavior and Properties of Lithium Disilicate-Wollastonite Glass-Ceramics

Abstract

The main purpose of this study is to evaluate the effect of heat-treatment parameters on the crystallization behavior, microstructure, physical and mechanical properties of lithium disilicate- wollastonite glass-ceramics obtained by melting method from the Li2O-SiO2-CaO-K2O-Al2O3-P2O5 system. The phase content and microstructure of the glass-ceramic samples were characterized by an X-ray diffractometer (XRD), scanning electron microscope (SEM), and EDS analysis. The bulk densities of samples were determined via the Archimedes principle, while mechanical properties were measured using a Vickers microhardness tester. XRD analyses showed that lithium disilicate (Li2Si2O5) and wollastonite (CaSiO3) were the main crystalline phases developed in the glass structure after heat treatment at 850°C for 5 hours. SEM analyses also revealed that the microstructure of glass-ceramics consisted of lamellar wollastonite crystals and rod-like lithium disilicate crystals that tended to grow from the surface to the bulk, and the crystallite size increased with increasing heat-treatment temperature and times. Increasing the heat treatment temperatures and durations also resulted in the improvement of crystallinity and optimum mechanical properties and density values were obtained in the heat treatment parameter performed at 800°C for 5 hours.

Keywords

Lithium disilicate, Wollastonite, Glass-ceramic, Mechanical properties, Microstructure

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