Investigation of the Properties of WC Layer Coated on the New Generation Nodular Graphite Cast Iron Surface with Thermoreactive Diffusion Technique

Abstract

In this study, WC coatability was investigated on the surface of new generation spheroidal graphite cast iron, which has a high silicon content and is preferred due to its properties, using the Thermo Reactive Diffusion (TRD) method. For this purpose, a mixture of 45% Al₂O₃+45% FeW and 10% NH₄Cl was used as coating powder, and the GGG70 spheroidal graphite cast iron surface, which was the substrate material, was coated with the TRD method at 1000 °C for 4 hours and at 1100 °C for 2, 4 and 6 hours. . The successfully obtained coated samples were sectioned and their coating morphologies, thicknesses and microhardness were examined. The phase structures formed on the coating surface were obtained by the X-Ray Diffraction method (XRD). As a result of the study, the lowest coating thickness was obtained on the sample coated at 1000 °C for 4 hours. Although the highest coating thickness was obtained on the sample coated at 1100 °C for 6 hours, flaking began to occur in the coatings. As a result of the microhardness analysis, it was observed that the hardness of the coating layer was approximately 8 times higher than the substrate material.