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Öğe Effect of different amounts of graphite on the sintering and transverse rupture properties of powder metal parts(2006) Boz, M.; Kurt, A.Iron powders were mixed with graphite powders by 1-15 wt pct to produce block samples using powder metallurgy technique. The powders were blended in a three dimensional blender for 20 min and compacted in a die under 500 MPa by using an one directional press. Sinterability and mechanical properties of the samples with different carbon content were investigated. Sintering process was carried out on a belt furnace with flame curtain in dissociated ammonia atmosphere. Block samples produced were suitable for ASTM B-312 transverse rupture strength test apparatus and were tested with 0.050 kN/s velocity in a press under 100 g load. It was found that graphite amount up to 2 wt pct increased the contact area of particles and acted as a lubricant to affect the sintering behavior positively. The results indicated that the samples containing up to 5 wt pct showed good sintering behavior and also good hardness due to an increase in pearlite amount. However, the samples containing higher amount of graphite (more than 5 wt pct) affected the sintering behavior negatively due to the settlement of free graphite around the iron powders, which resulted in a decrease in the hardness and transverse rupture strength.Öğe The Effect of SiO2 on the Friction Performance of Automotive Brake Friction Materials(Natl Acad Sciences Ukraine, Inst Metal Physics, 2011) Boz, M.; Kurt, A.In this study, 0.5%, 1.0%, 2.0% and 4.0% weighted SiO2 powders were added to bronze-based materials, which are used as friction materials. Blended powders were mixed in three-dimensional mixers to provide a homogeneous mixture. Powders were pressed under pressure of 350 MPa using a single-action press. Pressed samples were sintered at 820 degrees C, for 20 minutes, in ammonia atmosphere. Sintered samples are tested in a wear test device. Wear and friction coefficient tests are carried out on sintered samples. As revealed, with higher amounts of SiO2, the friction coefficient is increased, and the wear ratio is decreased.Öğe The effect of SiO2 on the friction performance of automotive brake friction materials(2011) Boz, M.; Kurt, A.In this study, 0.5%, 1.0%, 2.0% and 4.0% weighted SiO2 powders were added to bronze-based materials, which are used as friction materials. Blended powders were mixed in three-dimensional mixers to provide a homogeneous mixture. Powders were pressed under pressure of 350 MPa using a single-action press. Pressed samples were sintered at 820°C for 20 minutes, in ammonia atmosphere. Sintered samples are tested in a wear test device. Wear and friction coefficient tests are carried out on sintered samples. As revealed, with higher amounts of SiO2, the friction coefficient is increased, and the wear ratio is decreased.Öğe Effect of welding speed to joinability on the friction stir welding(2004) Kurt, A.; Boz, M.; Özdemir, M.Although friction stir welding method has been developed for 10 years ago it has found intensive usage in industry now. In this study aluminium sheets with the size of 5×50×120 mm were joined by friction stir welding method by using a milling machine. Joining processes were carried out at 6.25, 10, 16 and 20 mm/min welding speeds and 800 spindle speed. In order to investigate the effect of welding speeds on metallurgical and mechanical properties, metallographic and mechanical tests were carried out on the welded areas of the samples.Öğe The Relationship Between Sensitivity to Violence Against Children and Sense of Responsibility and Behavior in University Students(Dokuz Eylul University, 2020) Özyürek, A.; Kürtüncü, M.; Sezgin, E.; Kurt, A.Background: The rate of violence against children is high in our country as in the whole world. Objective: The aim of this study was to investigate the relationship between the sensitivity to violence against children and their sense of responsibility and behavior in university students studying on health sciences. Methods: The sample of this study consisted of 657 students (454 females and 203 males) studying on health sciences. “Sensitivity to Violence Against Children Scale” and “Sense of Responsibility and Behavior Scale” were used for the data collection. One-way ANOVA, Mann Whitney U-Tests and Pearson correlation coefficient were used for data analysis. Results: 27% of the students were studying medicine, 15.7% were dentistry, 42.5% were nursing, 53.4% were in first grade and 46.6% were in fourth grade, 36.1% were under 20 and 32.1% were is in the 23-25 age range. It was determined that female students' sensitivity to violence towards children, sense of responsibility and behavior were significantly higher than boys. It was determined that the sensitivity to violence against children was not affected by age and grade, and the sense of responsibility and behavior were higher in the fourth grade than in the first grade and the girls were higher than the boys. As the participants' sense of responsibility and behaviors increased, their sensitivity to violence against children increased. Conclusion: It can be said that women are more sensitive to violence against children and individuals with low sense of responsibility and behavior are insensitive to violence. © 2020, Dokuz Eylul University. All rights reserved.
