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The Carbothermal Reduction of Silica with Y₂O₃-MgO Powders

100%
Canikoğlu N.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
162-164
EN
The aim of this study is to examine the effect of MgO and Y₂O₃ to the carbothermal reduction and nitridation of silica. The synthetic silica, MgO and Y₂O₃ powders were premixed (4wt% MgO-6% Y₂O₃, 5% MgO-5% Y₂O₃ and 6% MgO-4% Y₂O₃) in the starting reactants depending on the final powder composition. Carbon black was added to the silica (SiO₂) above the stoichiometric amount of oxygen (C/SiO₂ ratio of 3). The carbothermal reduction and nitridation process was carried out in a tube furnace at 1400°C, 1450°C, and 1475°C for 3 h under nitrogen gas atmosphere. The synthesized Si₃N₄ powder properties were examined by using X-ray diffraction, scanning electron microscopy-energy dispersive X-ray spectrosopy. In this study, MgO and Y₂O₃ powders dispersed in the final Si₃N₄ powder more homogeneously and thus formable and sinterable the starting mixing material is produced.
2
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The Mechanical Properties and Wear Resistance of HVOF Sprayed WC-Co Coatings

51%
Özbek Y., Canikoğlu N., İpek M.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 4
600-603
EN
In this work, the Woka 5810 powders (88% tungsten carbide-12% cobalt) were used to produce coating by high velocity oxy-fuel spraying. WC-Co is widely used as a tribological coating material providing a combination of high toughness, high hardness, and good strength. The treated samples were characterized by using optical micrograph, stereo microscope and scanning electron microscopy, X-ray diffractometry, and microhardness tests. Also the wear performance of the coatings was investigated. The results indicated that the coating shows slight higher microhardness and better abrasive wear resistance than the conventional counterpart. The friction coefficient of coating was low. The scanning electron microscopy and energy dispersive spectroscopy analyses were applied to worn surfaces.
3
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The Surface Properties of WC-Co-Cr Based Coatings Deposited by High Velocity Oxygen Fuel Spraying

51%
Ozbek Y., Canikoğlu N., İpek M.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
186-189
EN
The aim of this research was to investigate microstructural and mechanical properties of the WC-Co-Cr coatings by high velocity oxygen fuel spraying. Woka 3653 (WC10Co4Cr) powder was used as coating material. This powder is widely used as a tribological coating material providing a combination of high toughness, high hardness, and good strength. The coatings were produced for the different high velocity oxygen fuel spraying parameters. The treated samples were characterized by using scanning electron microscopy/energy dispersive X-ray spectrometry and X-ray diffractometry. Microhardness measurements were executed to evaluate the mechanical properties of the coatings. Also the wear performance of the coatings was investigated. The scanning electron microscopy and energy dispersive X-ray spectrometry analyses were applied to worn surfaces. The results indicated that the coating shows slightly higher microhardness and better abrasive wear resistance than the conventional counterpart.
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