Details of Grant 

EPSRC Reference:	GR/S26101/01
Title:	DARP: Advanced Aerospance Materials - Electrical
Principal Investigator:	Mathur, Professor ND
Other Investigators:	Bhadeshia, Professor H
Researcher Co-Investigators:
Project Partners:	QinetiQ Rolls-Royce Plc
Department:	Materials Science & Metallurgy
Organisation:	University of Cambridge
Scheme:	Standard Research (Pre-FEC)
Starts:	01 April 2003	Ends:	31 March 2004	Value (£):	59,343
EPSRC Research Topic Classifications:	Materials testing & eng.
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
Related Grants:	GR/S26132/01 GR/S26118/01 GR/S26149/01 GR/S26095/01 GR/S26125/01 GR/S26156/01
Panel History:
Summary on Grant Application Form
Increased performance soft magnetic materials would enable the design of smaller, lighter, more power dense electrical machines, helping to minimise the impact of 'more electric' technology within aerospace gas turbines. Current cobalt iron alloys, such as Rotelloy 8 and Hiperco 50HS, have relatively high losses at switching frequencies of interest, leading to increased cooling requirements and/or reduced power density. The current limit on saturation flux magnetisation of ~2.35T leads to unacceptable weights for active magnetic bearings. For an oil-less engine to be realised, improvement insaturation flux magnetisation will be required. We will use modelling to evaluate the most likely route for soft magnetic cobalt-iron alloy development to reduce losses and/or increase saturation magnetisation. The background data needed for building a suitable model/neural network for these materials would require the input of a material supplier and a detailed study of the literature. We will also perform a basic theoretical study of novel materials with higher saturation magnetisation. Iron nitride based thin films have improved saturation flux magnetisation compared to bulk CoFe, and other materials based on rare earths may offer improvements. Layered structures should be investigated, with regard to engineering them into 'bulk' materials, whilst retaining enhanced magnetic properties.
Key Findings
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Organisation Website:	http://www.cam.ac.uk