Mathematical modeling of roughness changing of hard metal coatings obtained by contactless electrical spark deposition
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KOSTADINOV, G., PENYASHKI, T., RADEV, D.. Mathematical modeling of roughness changing of hard metal coatings obtained by contactless electrical spark deposition. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, pp. 280-281.
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Materials Science and Condensed Matter Physics
Ediția 9, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
9, Chișinău, Moldova, 25-28 septembrie 2018

Mathematical modeling of roughness changing of hard metal coatings obtained by contactless electrical spark deposition

CZU: 539.2+621.9.02+669

Pag. 280-281

Kostadinov G.1, Penyashki T.1, Radev D.2
 
1 Institute of Soil Sciences, Agro-tehnologies and Plant Protection „N. Pushkarov“,
2 Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences
 
 
Disponibil în IBN: 12 februarie 2019


Rezumat

Results of the roughness studies of multicomponent hard metal layers on X12 tool steel (210Cr12 / 1.8-2.2% C, 12% Cr) obtained by contactless local electrospark deposition using two types hard metal electrodes (WC-TaC-Co-Al2O3 and WC-(Ti,Ta,Nb)C-Co-Al2O3) are presented here. Aiming obtaining of coatings with higher thickness, the energy of the pulse generator of conventional machine ELFA541 has been enhanced from 0.02 to 0.15 J. Dense, smooth and uniform coatings with a good repeatability of properties have been obtained. The minimal and maximal values of thickness δ, of roughness parameter Ra, and of micro hardness HV of obtained coatings are changed by altering the stratification regimes in borders, respectively: - δ = 3 ’ 12μm, Ra = 0,8 ’ 2,2μm and Hv = 8,5 ’ 18 GPa. The influence of the process parameters and the electrode composition on the roughness and thickness of the layers obtained have been studied. Mathematical-statistical models and equations of second degree describing the roughness of the coatings have been created and worked out. They enable obtaining of coatings with a predetermined roughness by control of the  regime parameters. From the theoretical analysis of the models the influence of the process parameters, such as current, duration and frequency of pulses and speed of stratification have been determined. Specific ways of obtaining coatings with reduced roughness at the maximum possible thickness, as well as recommendations for their appropriate application have also been proposed and justified. Based on the obtained regression equations and graphical dependencies, it is possible to optimize properties of the coatings, and the conditions of their deposition in order to obtain maximum tribo-effect and increased performance properties of the coated surfaces for different cases of exploitation.