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Reciprocating Wear Behavior of Ni-Co Alloys Produced by Pulse Current Electrodeposition

100%
Karslioğlu R., Uysal M., Alp A., Akbulut H.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
424-426
EN
In the present work, Ni-Co alloy coatings were prepared from a modified Watt type electrolyte by direct current. For this purpose, current density was investigated for optimization to obtain high quality coatings on the steel copper substrates. The depositions were controlled to obtain specific thickness (between 50 and 200 μm). The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The hardness of the resultant coatings was also measured. The effects of the current density on the tribological properties of Ni-Co coatings were investigated. The results showed that although increasing current density showed increasing coating thickness, the wear resistance of the Ni-Co alloys was decreased due to Co depletion in the deposited layer.
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The Preparation of Core-Shell Al_2O_3/Cu Composite Powders by Electroless Plating in the Alkaline Solution

100%
Uysal M., Karslioğlu R., Alp A., Akbulut H.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
238-240
EN
In this study, Cu-coated Al_2O_3 composite powders were synthesized by using electroless plating method. The influence of the plating bath composition and ceramic powder concentration on the Cu plating was characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The results showed that the electroless bath composition plays an important role for the structure of nano core-shell Al_2O_3/Cu composite powders. The content of copper in the composite powders could be effectively controlled by adjusting the content of copper sulfate and formaldehyde in the plating solution. Furthermore, the pretreatment of the Al_2O_3 powders is also a key factor to form a uniform shell copper layer coating on Al_2O_3 particles.
3
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Characteristics Bronze/Al_2O_3(Ni) Reinforcement Metal Matrix Composite Produced by Current Activated Sintering

100%
Uysal M., Karslioğlu R., Akbulut H., Alp A.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
235-237
EN
In this study, a bronze matrix (90 wt% Cu + 10 wt% Sn) was reinforced with Al_2O_3 particles using mechanical alloying and then produced by a subsequent rapid current sintering technique. The mechanically ball milled bronze powders were reinforced with electroless Ni coated 20 vol.% Al_2O_3 particles with three different particle sizes of 90, 70, and 50 μm. Microhardness testing, and scanning electron microscopy were used for the structural characterization of the composites. The tribological behavior of the resultant composites was tested by the ball-on-disk method at 1.0 N applied load with 0.3 m/s sliding speed for determination the wear loss and friction coefficient features against a counterface steel ball.
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