Minel GÜN, BSc. Student

Metallurgy and Materials Engineering
Yıldız Technical University
Faculty of Chemistry - Metallurgy



Research of Glass-Ceramics
Glass-ceramics are ceramic materials formed through the controlled nucleation and crystallization of
glass. Glass-ceramics developed according to the service conditions of the place of use are mostly
produced by mixing pure materials, but can also be produced from natural rocks (basalt) and
metallurgical wastes. Glass ceramics have some important advantages over traditional polycrystalline
ceramics. Zero porosity can be achieved due to the main material being a glass and therefore dense.
Glass ceramics may also have better properties than the properties of the main glass, and even
better than some of the traditional ceramics, such as mechanical strength, chemical resistance and
thermal shock resistance. For the production of dense glass ceramics, the selection of a suitable glass
composition that reduces the viscosity of the glass and a fluxifying additive and nucleating agent is of
great importance. Additives may be required to provide adequate nucleation sites. These are known
as nucleating agents. Examples of such agents are TiO2 and P2O5. Nucleating agents dissolve in glass,

but after cooling or reheating, they can be precipitated and act as nucleation sites where crystal
growth can occur.

[1] Glass-ceramic technology /  Wolfram Höland, George H. Beall

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