Preparation and Characterization of Nickel-Chrome Alloy Coated by SiC

The ceramic coatings on metallic materials have attracted by many researchers due to the chemical inertness of ceramic materials. In such aspect, SiC is a promising material to be used as protective coating layer on metallic materials due to its outstanding thermal stability and chemical inertness. In this research, SiC coating was carried out onto Ni-Cr substrate using Cl free preceramic polymers such as polyphenylcarbosilane. 20% of polymethylphenylsilane in cyclohexane solution was coated onto metal by a dip coating method. Thermal oxidation was carried out at 200°C for crosslink of the preceramic polymer and the sample was pyrolysized at 800°C under nitrogen to convert the preceramic polymer to amorphous SiCx film. The microstructure of the SiCx coating after pyrolysis was investigated using a scanning electron microscopy.