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1
Content available remote

Volcanic Ash Reinforcement Concentration Effect on Thermal Properties of Polyvinyl Chloride Composites

100%
Fidan S.
Acta Physica Polonica A
|
2015
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vol. 127
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issue 4
1002-1003
EN
This paper reports the results of experiments evaluating the thermal properties of volcanic ash (VA) reinforced polyvinyl chloride (PVC) composites with various concentrations. PVC matrix composites reinforced with various VA concentrations (5, 10, 15, 20 and 25 wt.%) were manufactured by using a twin screw micro-compounder and an injection molding machine. Thermogravimetric analysis (TGA) was used to monitor the changes in physical and chemical properties of VA reinforced PVC composites as a function of increasing temperature and time. Measuring the changes in weight of the material as a result of heating gives valuable information about thermal degradation of VA reinforced PVC composites. Therefore by using TGA, effect of volcanic ash concentration on thermal stability and degradation extent of PVC matrix composite was evaluated
2
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The Evaluation of Solid Particle Erosion in Polymethyl Methacrylate by Surface Topography Mapping

100%
Fidan S.
|
EN
The present work introduces and demonstrates a novel high resolution surface topography method for mapping the distribution of erosive wear in polymethyl methacrylate. The technique is based on grayvalues obtained from eroded sample surfaces and three-dimensional surface topography mapping from these grayvalues. Surface topography maps make it a valuable method for fundamental studies on erosive wear. In the present investigation, a flatbed scanner system has been used for obtaining the surface images of eroded test samples. Polymethyl methacrylate test samples eroded with 80 and 120 mesh alumina particles at 1.5 and 3 bar blast pressures and their surface topography maps compared. Erosive wear is difficult to visualize for its dynamic and complex nature, hence monitoring of erosive wear in industrial applications is rather important. High resolution surface topography method detail capturing capability may improve tribological surface damage characterization of real machine elements. Reduced costs and simplicity two primary outcomes of using a simple flatbed scanner system in non destructive testing of erosive wear.
3
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Influences of Particle Impingement Angle and Velocity on Surface Roughness, Erosion Rate, and 3D Surface Morphology of Solid Particle Eroded Ti6Al4V Alloy

45%
Avcu E., Yıldıran Y., Şahin A., Fidan S., Sınmazçelik T.
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vol. 125
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issue 2
541-543
EN
In this study, it is aimed to investigate the effects of particle impingement angle and velocity on the surface roughness, erosion rate, and surface morphology of solid particle eroded Ti6Al4V alloy. Ti6Al4V samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45°, 60°, 75° and 90°) and impingement velocities (33 m/s, 50 m/s, and 75 m/s) by using 120 mesh garnet erodent particles. Subsequently, erosion rates and surface roughness values of samples were analyzed and calculated as a function of particle impingement angle and velocity. Moreover, 3D surface morphologies of the eroded samples were prepared by using high definition scanner and image processing programs. Results show that erosion rates, surface roughness values and surface morphologies of Ti6Al4V alloy have been varied significantly depending on the both particle impingement angle and velocity. Erosion rates of Ti6Al4V alloy were decreased with increases in particle impingement angle; on the other hand, the surface roughness values were increased with increases in particle impingement angle. Both erosion rates and surface roughness values were increased with increases in particle impingement velocity. Finally, the surface morphologies of the eroded samples were evaluated deeply. It is concluded that the surface morphology variation of the Ti6Al4V alloy depending on the particle impingement angle and velocity were well correlated with the erosion rates and the surface roughness values.
4
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Mechanical and Thermal Properties of Pumice Powder Filled PPS Composites

45%
Sahin A., Yildiran Y., Avcu E., Fidan S., Sinmazcelik T.
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vol. 125
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issue 2
518-520
EN
Recently, it is common application to use particle materials as fillers to improve engineering properties and lower the cost of finished product. Pumice powder is cheaper than most of traditional particle fillers, however use of pumice powders as a reinforcing material in composites has not been studied in literature. Hence, in this study we have investigated the mechanical and the thermal properties of pumice powder filled polyphenylenesulphide (PPS) composites. PPS composites were reinforced with pumice powder at different loading rates (0, 1, 3.5, and 10 wt%) and they were manufactured by twin screw extruder and injection molding machine. Thermal properties were investigated by thermogravimetric analysis and differential scanning calorimeter methods. Moreover, mechanical properties such as barcol hardness, tensile strength, and modulus of samples were investigated. Thermal properties of composite samples have varied significantly depending on the loading rate. Also mechanical properties of pumice powder filled PPS composites have showed better results than pure PPS. According to test results both of mechanical and thermal properties of composites have improved with pumice powder reinforcement and it is determined that pumice powders can be used instead of traditional particle fillers.
5
Content available remote

Surface Modification Effect of Volcanic Ash Particles Using Silane Coupling Agent on Mechanical Properties of Polyphenylene Sulfide Composites

45%
Bora M., Çoban O., Fidan S., Kutluk T., Sinmazçelik T.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
495-497
EN
The surface treatment of volcanic ash particles with various concentrations (1-3-5% (v/v)) silane coupling agent (3-aminopropyltriethoxysilane (3-APTS)) having organic functional group was conducted. After surface treatment, polyphenylene sulfide (PPS) composite samples containing surface treated volcanic ash particles at two concentrations (10 and 15 wt%) were manufactured by twin screw extruder and injection molding machine. This study investigated the effect of surface modification on mechanical properties of two different concentrated volcanic ash/PPS composites. All tests were performed using a Shimadzu AG-X Universal Tester. Tensile and three point bending tests were carried out at a crosshead speed of 1 mm/min and 2 mm/min according to ISO 527-2 and ASTM D790 standards, respectively. During the experiments, the relation between the mechanical properties and surface treatment concentrations of silane agent on volcanic ash/PPS composites was determined as a function of tensile strength and modulus, flexural strength and modulus. Moreover, fracture surface morphologies of volcanic ash/PPS composite samples were observed by using a scanning electron microscopy.
6
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Effect of Silane as Coupling Agent on Dynamic Mechanical Properties of Volcanic Ash Filled PPS Composites

45%
Çoban O., Bora M., Kutluk T., Fidan S., Sınmazçelik T.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 4
492-494
EN
The purpose of this study is to investigate the effect of surface modification of volcanic ash particles on dynamic mechanical properties of volcanic ash filled polyphenylene sulfide (PPS) composites. For this purpose volcanic ash particles were modified with 1, 3, 5 vol.% of 3-aminopropyltriethoxysilane (3-APTS) which has an organic functional group. All volcanic ash/PPS composite samples were prepared by using DSM Xplore 15 ml twin screw microcompounder and DSM Xplore 12 ml injection molding machines. The content of volcanic ash in composite samples was varied as 10 and 15 wt%. Volcanic ash filler dispersion and adhesion between volcanic ash particles and PPS matrix were examined by scanning electron microscopy. Dynamic mechanical properties such as storage modulus (E') and glass transition temperature (T_{g}) were investigated by TA Instruments Q800 dynamic mechanical analyzer. During the experiments, the relation between silane coupling and dynamic mechanical properties was evaluated.
7
Content available remote

Silane Coupling Efficiency on Thermal Properties of Volcanic Ash Filled PPS Composites

45%
Kutluk T., Çoban O., Bora M., Fidan S., Sınmazçelik T.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 4
498-500
EN
Thermal properties of volcanic ash filled polyphenylene sulfide (PPS) composites have been investigated with respect to surface treatment that was conducted with 3-aminopropyltriethoxysilane (3-APTS) which had an organic functional group. Volcanic ash/PPS composite samples were prepared by using DSM Xplore 15 ml twin screw microcompounder and DSM Xplore 12 ml injection molding machines. The content of volcanic ash in composite samples was varied as 10 and 15 wt%. Volcanic ash filler dispersion and adhesion between volcanic ash particles and PPS matrix were examined by scanning electron microscopy. Thermal properties such as crystallization and melting behavior were investigated by TA Instruments Q200 differential scanning calorimeter. According to the test results, the relation between the thermal properties and surface treatment was determined as a function of melting temperature and melting enthalpy. Additionally, crystallization behavior was investigated according to surface treatment.
8
Content available remote

Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy

39%
Yıldıran Y., Avcu E., Şahin A., Fidan S., Yetiştiren H., Sınmazçelik T.
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vol. 125
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issue 2
523-525
EN
This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
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