خواص سايشي و خوردگي پوشش هاي كامپوزيتي Al-SiC سنتز شده به روش پاشش شعله اي پودري

In this study, aluminum–silicon carbide (Al–SiC) composite coatings containing different SiC contents (10–40 wt.%) were deposited on CK45 steel substrates using the flame thermal spraying process. XRD, SEM, an‎d EDS analyses confirmed the presence of Al an‎d SiC phases an‎d indicated that the coating–substrate bonding was predominantly mechanical in nature. The coating thicknesses were measured to be in the range of 350–500 μm. Porosity measurements showed that the coating containing 10 wt.% SiC exhibited the highest porosity, while surface roughness increased with increasing SiC content. Wear tests conducted at room temperature demonstrated a continuous improvement in wear resistance up to 30 wt.% SiC, with this coating exhibiting the lowest wear track depth an‎d width, weight loss, an‎d coefficient of friction. At 300 °C, the coating with 20 wt.% SiC showed the smallest wear track dimensions, whereas the coating with 30 wt.% SiC exhibited the lowest weight loss. Potentiodynamic polarization results indicated that the corrosion resistance of the coatings was lower than that of the substrate; however, the coatings containing 10 an‎d 30 wt.% SiC showed better corrosion performance compared to the other samples. In addition, increasing the SiC content led to improved adhesion strength an‎d scratch resistance. Overall, the coating containing 30 wt.% SiC is proposed as the optimal composition, providing the best balance among wear, corrosion, an‎d adhesion properties.

مهران نحوي , فخرالدين اشرفي زاده

فاطمه يوسفان

عباس بهرامي , علي اشرفي