Surface characterization of the ceramic coating process on aluminum matrix composite reinforced particulate

Particulate-reinforced aluminum matrix composite for automotive components are developed since they have light density, high strength, and hardness, wear-resistant properties also low heat expansion coefficient compared to ferrous metals. An important factor that influences the composite characteristics is the condition of the interface area between the particle and the aluminum matrix with optimal wettability and minimal cavity defects. This research aims to improve hardness on particulate-reinforced aluminum composite which produces by a squeeze casting manufacturing process and ceramic coating process. Steps of this research include the development of an aluminum matrix composite manufacturing processes, which is followed by a ceramic coating process. Matrix composite material made of Al-7Si-9Zn-6Mg matrix with strengthened of 10% alumina (Al₂O₃) and 10% silicon carbide (SiC) particles, while for coating materials using Chromium Oxide, Aluminum Oxide, and Ez Zirconium. The results of the hardness test without the ceramic coating process are an average of 71 HRB (127 HV). After the coating process, an obtained hardness value of 163 HV for coating material of Chromium Oxide, 373 HV for Aluminum Oxide, and 338 HV for Ez Zirconium. The wear resistance test results in abrasion values of 2.222 x10^-6 mm²/kg for coating materials of Chromium Oxide, 1.633 x 10^-6mm²/kg for Aluminum Oxide, and 7.021 x 10^-6mm²/kg for Ez Zirconium. (paper)