Effect of Different Metal Oxides On Vickers Hardness of the Frit Based Crystalline Glazes

Year 2018, Volume: 7 Issue: 1, 32 - 40, 30.06.2018

Keriman Pekkan Yalçın Gün

https://doi.org/10.17100/nevbiltek.368987

Cited By: 1

Abstract

Frit based
glaze is a thin glassy surface coating which gives technical and aesthetic
value to the ceramic product after firing. Crystalline
glazes are one of the most important type of artistic glazes formed through a
controlled crystallization of glass during a special heat treatment. Crystals
are visible to the naked eye and the product can have only a few single
crystals on the surface or the entire surface can be coated with crystals. The
preferred clay substrate for crystalline glazes is porcelain and in some cases
may be used for the macrocrystallines. Usage of these types of glazes as
porcelain tile coatings is an alternative choice for relevant ceramic industry
and these glazes strongly enhance the visual quality of the final products. When designing crystalline glazes for porcelain tiles;
besides the chemical composition, mechanical properties such as hardness is
also an important factor. Within
the scope of experimental studies, frit based crystalline glazes which consist
of different nucleating agents such as MnO, Fe₂O₃, NiO,
CoO, CuO and Cr₂O₃ were applied on the raw porcelain
bodies and then subjected to a special heat treatment cycle. The aim of this
study was to investigate the effect of different metal oxides on
crystallization capacity of newly developed fritted glaze compositions and
Vickers hardness of the final products. Micro hardness of the glazes was
measured with Vickers hardness test method. Characterization of crystalline
glazes was done by x-ray diffraction (XRD) technique.

Keywords

Hardness, crystallization, metal oxides

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