Effect of duty cycle on residual stress and tribology behaviour of TiC_x nanostructure coating deposited by PACVD method

Abstract

In this paper, nanostructured TiC x was coated onto H11 hot working steel by pulsed dc plasma assisted chemical vapour deposition method, and various duty cycles were carried out in order to observe the influence of this parameter on residual stress and tribology behaviours. The duty cycles were 33, 40 and 50% at 510uC operating temperature. Therefore, wear behaviour, hardness and chemical analyses of TiC x nanostructure coating were characterised, and it was found that the residual stresses in the coating were compressive, which were 21?1516, 20?1323 and 20?1752 MPa at three different duty cycles, i.e. 33, 40 and 50% respectively. According to the results, the coating that was applied at 40% exhibited superior wear resistance and possessed the lowest friction coefficient of ,0?06 in a pin-on-disc test against WC-Co.

Characterisation and properties of hybrid coatings deposited onto magnesium alloys

“…It should be noted that such analysis requires knowledge of the values of a number of parameters, which are mainly the physical and mechanical properties of the substrate material and the surface layer, as well the parameters of the surface layer deposition process. [14][15][16][17][18] The aim of this innovative work was to obtain the best possible hybrid coatings, consisting of a gradient transition layer, with a continuous change of one or more components reaching from the substrate to the surface top. It was also important to achieve an outer coating using the cathode arc evaporation physical vapour deposition (PVD) and plasma assisted chemical vapour deposition (CVD) process on the surface of the cast magnesium alloys in order to increase the low stiffness of the substrate material.…”