Abstract
The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from the consideration that the incorporation of SiC particles in the molten aluminum alloy can be difficult due to the very low wettability of SiC particles. In order to increase their wettability, SiC particles were covered with a layer of metallic copper. The incorporation of SiC particles into the aluminum alloy mass was performed by centrifugal casting. The secondary hypoeutectic Al-Si alloy used in this study was elaborated within the crucible of a resistors heated furnace. The metallic coating of SiC particles, in addition to the effect of increasing their wettability by molten metal, also has a role in preventing the formation of aluminum carbide in case of heating above 700 °C. A great amount of attention was paid to the parameters used during the centrifugal casting process. The results showed that adjusting the proportion of SiC particles within the composite allows us to obtain values of the thermal expansion coefficient within previously established limits. The present work demonstrates that the coating of SiC particles covered with a thin layer of metallic Cu creates the conditions to easily incorporate them into the molten Al mass, thus obtaining FGMs with controlled properties.
Highlights
The alert pace in which technology develops nowadays leads us with no doubt to what the researchers named “Industry 4.0”
The need to develop property gradient materials has arisen with the development of modern industries that are increasingly demanding products that behave differently depending on the demands [1]
Some of them focused on the analysis of the production process of these materials as well as on the modelling and simulation of the process [2,3,4,5,6] while others turned their attention to the inevitably generated residual stresses of functionally graded materials (FGMs) due to thermal mismatch of each basic material using experimental and analytical methods [7,8] or their characterization [1]
Summary
The alert pace in which technology develops nowadays leads us with no doubt to what the researchers named “Industry 4.0”. This stage of industry development is not possible without the astonishing development of materials engineering research. The need to develop property gradient materials has arisen with the development of modern industries that are increasingly demanding products that behave differently depending on the demands [1]. Based on these considerations, in 1984, in Japan, the concept of FGM first appeared. Some of them focused on the analysis of the production process of these materials as well as on the modelling and simulation of the process [2,3,4,5,6] while others turned their attention to the inevitably generated residual stresses of FGMs due to thermal mismatch of each basic material using experimental and analytical methods [7,8] or their characterization [1]
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