Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Resistance properties of heat-resisting steel-based PVD coatings

nr katalogowy: 84305

The X8CrNi25-21 grade steel is austenitic heat-resisting steel used in power engineering. This steel owes its heat resistance to the high contents of alloy additions of nickel and chromium, whereby compact Cr2O3 chromium oxide films form on the steel surface at elevated temperature [1, 2]. Heat-resisting steels are also used for applying protective coatings, especially on elements less resistant to the high temperature. Due to their multicomponent nature, the most suitable method of applying coatings of heat-resisting steels is the plasma-assisted physical vapour deposition (PVD) method [3÷5]. The micro- and nanocrystalline structure of the coatings promotes the diffusion of chrome [6]. An additional increase in the heat-resisting properties of both the steel and the coating can be achieved by enriching their chemical composition with additions of silicon and aluminium [7÷9]. As a metallic alloy, steel is an electric current conductor, thus offering the possibility of being resistance heated, e.g. for heat treatment or heat resistance assessment purposes. Resistance heating also finds an application for joining steel sheets by welding [10]. In any case current thermal power P is used for heating up steel, which is the Joule-Lenz effect, being proportional to the square current intensity I and the resistance R of steel, according to the following relationship (1) [11]. P = R · I2 (1) The resistivity of steel depends on its chemical composition and ranges from 0.75 to 1.1 mm2/m [12]. The addition of Si causes an increase in steel resistance, which, in the case of electrical engineering applications, reduces the losses due to eddy currents. The increase in temperature results in an increase in steel resistance. The study described in this paper has determined the resistance of AISI 310S heat-resisting steel PVD coatings with aluminium and silicon additions introduced. In addition, the temperature stability of coati[...]

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