Casting parameters Sample Clauses

Casting parameters. ‌ The development of a mathematical model for casting is a huge task. It is not the intention of this project to develop a complete model that can predict the final microstructure of the cast silicon. However, modelling the heat transfer during casting is relatively straightforward. Assuming that we can at some point establish the proper effect of cooling rate on the final microstructure, we attempt to control the process parameters that decide the cooling rate and the heat removal during casting. Eventually, when the optimal cooling rate (as discussed in the previous chapter) has been determined one can run the process accordingly. Several process parameters will have an effect on the final product quality, such as alloy composition, temperature, mass flow rate, viscosity, casting thickness. Heat removal from the molten silicon is determined by both contact with the substrate beneath as well as the atmosphere above. Some key properties for the cooling substrate are temperature, size distribution, heat conductivity, thickness, chemistry. The heat removal from the top surface can be by radiation only or increased by convective flow of gas (typically air) or additional cooling such as water mist or water spray. At Elkem Thamshavn, heat removal from the surface is by radiation and natural convection.
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