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  1. 6 Acta Physica Polonica A

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  1. 1 2015

  2. 5 2014

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  1. 6 Tunali A.

  2. 4 Selli N.

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1
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Characterisation of High Abrasion Resistant Commercial Glazes

100%
Tunali A.
Acta Physica Polonica A
|
2015
|
vol. 127
|
issue 4
1243-1245
EN
In recent years high-abrasion resistance became industrially important for floor and porcelain tiles. Abrasive wear mechanism of commercial ceramic glazes were investigated by Scanning Electron Microscope, X-ray diffraction (XRD) and abrasion test using the PEI-visual evaluation technique. The study shows that anorthite is the main phase of commercial glazes, accompanied with quartz and corundum, and its properties are not good enough for high resistance. It is also observed that when mean free path of the anorthite phase decreases the wear resistance increases.
2
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Industrial-Scale Application of Characterization Techniques to Improve Surface Quality of Opaque Floor Tile Glazes

100%
Tunali A.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
667-668
EN
Improvement of surface quality of opaque floor tile glazes was the main purpose of this study. Opaque floor tile glaze was produced by mixing different frit compositions. Effects of softening point on glaze surface properties were investigated by thermal analysis. It was found that by increasing softening point of glaze composition surface defects can be solved and nanosized crystals similar to the wavelength of incident light can be achieved to obtain high opacity.
3
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Role of the Quartz Particles on Stain Resistance of the Polished Porcelain Tiles

63%
Selli N., Tunali A.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
506-508
EN
In present study, effect of quartz particle size on microstructure and stain resistance of porcelain tiles were examined. Milling time was utilized as a main parameter to control residual quartz particle size. 12, 16 and 20 min milling time were used in a laboratory condition. As milling time increases, the particle size of residual quartz decreases. This reduction in the residual quartz particle size results in enhancement of the microstructure. When the microstructure contains irregular pores with high aspect ratio which are generally formed around the residual quartz in the body, stain resistance of the porcelain tiles decreases. Therefore, microstructural changes versus quartz particle size were investigated considering stain resistance of the polished porcelain tiles.
4
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Effect of B_2O_3/SiO_2 Ratio on Transparency of Anorthite Based Glass-Ceramic Glazes

63%
Tunali A., Selli N.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
511-512
EN
The present study was undertaken to determine the influence of B_2O_3/SiO_2 ratio on devitrification behaviour, anorthite crystal size and transparency of glass-ceramic glazes. Measurement by X-ray diffraction combined with scanning electron microscopy and energy dispersive X-ray spectroscopy microanalysis show that needle-like crystals of anorthite are formed. Sinterization and devitrification behaviour of system and viscosity change with temperature were analyzed by combining the datas that belong to differential thermal analysis and heating microscope analysis. Crystal size of anorthite was changed by modifying B_2O_3/SiO_2 ratio. It is confirmed that additional B_2O_3 prevents immediate phase separation during heat treatment in anorthite based glass-ceramic glazes.
5
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Influence of the Photoluminescent Pigments' Particle Size Distribution on the After Glow Duration

63%
Tunali A., Selli N.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
513-514
EN
Novel inorganic luminescent materials have provided improvements in lighting, display, and optical devices. They are generally used for decorative applications, safety signs, and tolls. The characteristics of the photoluminescent pigments depend on both physical and chemical characteristics. In this study, particle size distribution effects on the after-glow time of the bluish-green and yellowish-green pigments were investigated. Milling times of the pigments were chosen as 30 min, 60 min and 90 min and they were applied on the wall tile surfaces with a constant ratio. Depending on the milling time, after-glow property of the pigments were compared by using photometer equipment. Correlations between pigments particle size distribution and after-glow time of the pigments were also discussed in this presentation.
6
Content available remote

Enhancement of the After-Glow Properties of Photoluminescent Tile by Designing Frit Composition with Low-Temperature Melting

63%
Selli N., Tunali A.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
509-510
EN
One of the persistent luminescence materials and providing emission in blue-green areas emission bands for typical phosphors (SrAl_2O_4:Eu^{2+}, CaAl_2O_4:Eu^{2+}, MgAl_2O_4:Eu^{2+}) are generally focused on recently. These systems are reliable, stable, not containing radiation and they have long term photoluminescence emission. These systems are mainly used in a wide range of products such as building, ceramics, line marks for highways, tolls, etc. In this study, SrAl_2O_4:Eu^{2+} phosphorescent pigment was used on wall tile surfaces. Due to the high firing temperature after-glow property of the pigment decreases. To increase afterglow property frit compositions with low temperature melting point were developed and depend on the composition, after-glow properties of the tiles were measured by photometer.
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