The analysis chemical composition, microstructure, and hardness disk brake of Cessna Caravan

Abstract

The properties of disc brake material in airplane functioning for assisting the process of applying the brake should be solid, thermally stable, wear-resistant, and corrosion-resistance. This study aimed at knowing the result of the testing of chemical composition and hardness testing. The testing result showed that it contained 92.1% Fe; Carbon 0.264%; Mn 1.3%; Cr 0.44%; 0.44% Nb; 0.35% Co; 0.36%Cu, and Ni 3.61%. It indicated that the disc brake was low carbon steel, namely Fe-Ni alloys. The microstructure testing performed in the disc brake component showed a dominant microstructure of the ferrite phase that was bright, soft, strong, and had a high thermal conductivity, while the pearlite phase was dark with high solidity, quick cooling, and fragile. The results of testing the hardness of Fe-Ni alloy 296.86 VHN, high hardness value so that the disk brake components are hard, heat resistant, and resistant to friction. The disk brake has a high hardness value, so the composition of this component is high in heat resistance, corrosion resistance, friction resistance, and has a high level of material hardness. The novelty in this research was low carbon steel material disk brake in Cessna Caravan better than disk brakes made of Al-MMC (Al-Aluminum nitride-metal boron carbide matrix composite) and gray cast iron. The advantages of this study are without the addition of Si02 but the hardness of the disk brake is high due to the material of medium carbon steel, so it has a good heat resistance and wears resistance.