Akademik Veri Yönetim Sistemi
1. BİLSEL International Divriği Scientific Researches Congress, Sivas, Türkiye, 1 - 02 Mart 2025, ss.176, (Özet Bildiri)
Asst. Prof. Betül Yıldız¹, Dr. Zehra Emeç
Aytaç²
ORCID: ¹0000-0002-7522-2000, ²0000-0002-4864-2094
E-Posta: ¹betul.yildiz@bilecik.edu.tr, ²zemeloytac@ngkutahyaseramik.com.tr
¹Bilecik Şeyh Edebali University, Faculty of Engineering, Metallurgy and
Materials Engineering, Bilecik, Türkiye
²NG Kütahya Seramik Inc., R&D Center, Kütahya, Türkiye
Anorthite-based glass-ceramics are
particularly valued for their high mechanical strength and exceptional chemical
resistance, which make them an ideal choice for developing high-hardness,
transparent glass-ceramic glazes for ceramic tiles. In glass-ceramic glazes,
the microstructure—especially the quantity and size of the crystals—directly
influences both the mechanical and optical properties of the glaze. Therefore,
the design and control of the microstructure in glass-ceramic glazes are
critical to achieving glazes with the desired characteristics.
In this study, the effect of zirconia (ZrO₂) addition in varying proportions on
the microstructural development, optical properties, and microhardness of
anorthite-based glass-ceramic glazes was systematically investigated. For this
purpose, initial frits were developed with 0%, 3%, 6%, and 9% ZrO₂ by weight.
The glazes were then prepared using these frits in a composition of 92% frit
and 8% kaolin by weight. The prepared glazes were fired under industrial fast
firing conditions in the NG Kütahya Factory. Microstructural developments of
the glazes were analyzed using X-ray diffraction (XRD) and scanning electron
microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), while optical
properties were measured with a Minolta color measurement device, and
microhardness was determined using a Vickers hardness tester. In compositions
containing 6% and 9% ZrO₂ by weight, zirconia phases were detected in addition
to anorthite. As the zirconia content increased, the density of anorthite
crystals within the glassy phase was observed to increase, while the size of
the anorthite crystals decreased. SEM results were consistent with the XRD
outcomes. The glazes with zirconia exhibited a relatively higher anorthite
intensity. As anticipated, the study revealed that with the increase in ZrO₂
content, the opacity of the glaze also increased. The highest microhardness was
achieved in the composition with the highest zirconia content.
Key Words: Anorthite, Frit, Glass Ceramic
Glaze, Glaze Properties, Zirconia