Effect of Silver Oxide on Colour Variation and Gloss of an Opaque Glaze

Israil, Lina Israel; Köseoğlu, Kemal; Cengizler, Hakan

doi:10.1080/0371750x.2013.868322

Cited by 1 publication

(2 citation statements)

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“…The effects are limitless depending on formulation, application and combinations [1]. If a glaze, when exposed to light, refracts light beams, it is called an OG [2,3]. The opaqueness of a glaze arises from the existence of tiny particles of substances which are insoluble in vitreous phase and have different refraction indexes, or from trapped air bubbles held in suspension within the glaze [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…If a glaze, when exposed to light, refracts light beams, it is called an OG [2,3]. The opaqueness of a glaze arises from the existence of tiny particles of substances which are insoluble in vitreous phase and have different refraction indexes, or from trapped air bubbles held in suspension within the glaze [2,3]. A surer way to achieve opacity is to add an opacifying agent or opacifier into a starting batch of either frit or glaze itself [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Quebracho Bark on the Properties of Opaque Glazes

Köseoğlu¹,

Cengizler²,

Israil³

2018

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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In this work, the effect of quebracho bark (QB) on the physical and chemical properties of opaque glaze/glazes (OG) was investigated. Various ratios (0.25-10 weight percent) of quebracho bark were incorporated into the glazes to obtain experimental glaze recipes and melting temperatures of the glaze compositions were calculated through the fluxing factors of the oxides present in the glazes. Thereafter, the glaze compositions were fired at the calculated temperature value of 1100°C. Viscosity, thixotropy and pH tests were conducted on OG and OG+QB glaze suspensions. Standard coloring analyses, crazing resistance, impact resistance, resistance to acid and alkalis, water absorption, firing strength, and surface hardness tests were conducted. After establishing the Seger formulas, surface tensions of the glazes were calculated by making use of the molar surface tension factors of the oxides already present in the glaze compositions at the same sintering temperature of 1100°C. QB additions decreased the viscosity and standard thixotropy values of the OG and had no significant effect on the pH of the OG slurry. On the other hand, QB additions caused an increase in the whiteness (opacity) of the OG. No crazing and impact fractures were observed on the glaze surfaces. Furthermore, the glaze surfaces showed good resistance to acid and alkalis. On QB incorporation, water absorption decreased in all the experimental glazes. Firing strength and surface hardness increased with increasing QB content. According to the experimental results, 5 weight percent (wt. %) QB addition was found to be the optimum amount.

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