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Influence of some factors on the powder deposition process by electrical discharges

Topala P., Slatineanu L., Dodun O., Pinzaru N.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2008

z. 73 [253]

277-282

The paper presents the results of some experimental researches concerning the electrical discharges deposition of the metallic powders an the workpieces cylindrical surfaces. The process could be included in the group of the manufacturing processes based on the physical effects of the electric current. The powder is introduced in the electrical discharge channel developed between the workpiece and the electrode. As consequence of the high temperature developed within the discharge channel, the powder and the superficial layer of the workpiece are melted and they constitute the new metallic layer, presenting more convenient properties from the point of view of the part behavior in service. Adequate mechanical and electric equipment was used to ensure the work conditions for the electrical discharge deposition The experimental researches were developed to study the influence exerted by certain work conditions on the man of the deposited material.

Some considerations concerning the surface microasperities evolution at the electrochemical dissolution

Slatineanu L., Dodun O., Santo L., Coteata M., Munteanu A., Ilii S.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2006

z. 68 [231]

199-206

The electrochemical polishing is the finishing method based on the diminishing of the asperities height as consequenee of the process of electrochemical dissolution. Some initial experimental remarks led the authors of the present paper to the conclusion that the more intense dissolution of the asperities tips could be the result of the smaller distance between these tips and the cathode surface. A systemic analysis was made to emphasize the factors able to exert irifluence on the roughness of the surfaces finished by electrochemical polishing. A theoretical model was also elaborated to know how the distance between the electrodes affects the Ra surface roughness parameter. The experimental researches showed that the electrochemical dissolution is more intense that our theoretical model shows; a possible explanation of this effect could be the influence exerted by the greater concentration of the electric field lines on the asperities tips.