Abstract
The effect of a nitride layer on the forming behavior of CrN and (Cr, Fe)7C3 multilayers for thermoreactive deposition (TRD) was investigated. Plasma nitriding followed by TRD (PN-TRD) produced a larger coating thickness than the case of direct TRD with no plasma nitriding. For PN-TRD, an Fe2-3N layer of 10 μm in thickness was produced on AISI 52100 steels using plasma nitriding, followed by TRD using a mixed powder composed of 30 wt % Cr, 2 wt % NH4Cl, and 68 wt % Al2O3. During TRD at 800 °C, a CrN layer of 2 μm in thickness was formed along with a thin layer of mixed carbide (Cr7C3) and nitride (CrN) on top. As the deposition temperature was increased to 950 °C, a new layer of Cr7C3 was formed underneath the outermost layer composed of mixed Cr7C3 and CrN. At 950 °C, a Cr-rich zone indicated a thickness of ~7 μm. As the deposition time increased to 3 h at 950 °C, a new layer of (Cr, Fe)7C3 was produced at the interface between the CrN formed at 800 °C and the base metal. This layer formed because of the abundant resources of Cr and C provided from the TRD powder and base metal, respectively. The multilayer and interface were concretely filled without the formation of voids as the TRD time increased to 6 h at 950 °C. The TRD process on a pre-nitrided layer was successfully applied to produce multilayers of CrN and Cr7C3.
Highlights
The materials request continuously higher performance and improved properties [1]
The multilayer and interface were concretely filled without the formation of voids as the thermoreactive deposition (TRD) time increased to 6 h at 950 ◦ C
In the surface treatment based on TRD, factors affecting the growth of the coating layer include temperature, time, powder composition, and base metal
Summary
The materials request continuously higher performance and improved properties [1]. many studies have been conducted to improve the wear resistance of materials. Studies on surface treatment using multicoating techniques [6,7,8,9,10] and multilayer formation have been conducted to improve bonding strength and wear resistance [11,12]. In PN, nitrogen is diffused into the base material to form a nitrided layer with high hardness; this improves fatigue, corrosion, and wear resistance, and gives excellent thermal stability with less deformation of the base metal. In the surface treatment based on TRD, factors affecting the growth of the coating layer include temperature, time, powder composition, and base metal. In the TRD process, the integrity of the coating layer and the diffusion behavior of the coating powder components were investigated with respect to temperature and time, and the formation behavior of multilayers was studied
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