Analytical and Experimental Studies on Wear Behaviour of Cast and Heat Treated AlSi 12 CuMgNi and AlZn 6 MgCu Matrix Composites Reinforced with Ceramic Particles, Under Sliding Conditions

Abstract

The working conditions of the composite materials used to produce machine parts lead to different forms of wear. The fact that, for example, for a kinematic coupling with sliding motion is often used a material with higher hardness (cast iron, steel) in combination with a material with a lower hardness (a composite material) there is the possibility of wear through abrasion and local plastic deformations. The paper proposes an analytical model for the determination of wear, depending on the angle of inclination of the roughness of the hard surface. The experimental wear investigations were made on cast iron disc (300 HB hardness) at room temperature using a “pin on disc” machine, at 3.5·10-1MPa and 7.5×10-1MPa contact pressure and 3.8 m/s sliding speed. The composite consisted from cast and heat treated AlSi 12 CuMgNi and AlZn 6 MgCu matrix reinforced with Al 2 O 3 and Graphite combined in different proportion, in the 0–5 volume percent range. The experimental results of the wear for the different materials are analyzed and compared to the analytical ones. The comparison of the experimental and the theoretical results confirms the veracity of the model and corresponds with many of the experimental results obtained in the specialized works.