# The effect of reflective baffles on the thermal gradient in directional solidification

MacDonald, James Edward (2012). The effect of reflective baffles on the thermal gradient in directional solidification. University of Birmingham. M.Res.

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## Abstract

Analysis of the heat transfer in the DS furnace allowed the development of a numerical model to calculate radiation and conduction in the furnace for the purpose of investigating the use of low emissivity, reflective baffles in place of traditional graphite foil material to provide a more effective radiation barrier. The potential improvements on thermal gradient that can be achieved have been calculated and experimental data has been obtained, with reflective copper baffles exhibiting improved thermal gradients in the furnace at 1000$$^o$$C. The potential effect on the microstructure of a turbine blade if this theory were to be applied to the casting process has been predicted. A copper baffle with water cooling has been tested beyond its melting point at 1300$$^o$$C and a design was proposed for a copper baffle with improved water cooling that should allow operation at temperatures used in turbine blade casting of around 1600$$^o$$C.

Type of Work: Thesis (Masters by Research > M.Res.)
Award Type: Masters by Research > M.Res.
Supervisor(s):
Supervisor(s)EmailORCID
Ward, MarkUNSPECIFIEDUNSPECIFIED
Licence:
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Metallurgy and Materials
Funders: None/not applicable
Subjects: T Technology > TN Mining engineering. Metallurgy
URI: http://etheses.bham.ac.uk/id/eprint/7202

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