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|Substituted Ferrites for Use as Electromagnetic Shields in Re-Entry Spacecraft|
|Keywords: high temparture, ferrites, microwave|
|To survive atmospheric re-entry from space, the external materials of a re-entry vehicle must be able to withstand temperatures of 1500-1600 ºC. The aerospace industry has tried to increase the robustness of ferrites, which are used as electromagnetic shields in coatings of space structures, to thermally and aerodynamically withstand atmospheric re-entry environments. In order to meet this demand, we are taking two approaches: substituting niobium into cobalt spinel ferrites (CoFe2O4, active in the MHz region), and substituting aluminium for iron in hexagonal ferrite (M-type hexaferrite, (Ba/Sr)Fe12-xAlxO19) systems which are active in the GHz / microwave region. This is because niobium as a well know refractory additive, and BaAl12O19 is iso-structural with M ferrites, and can withstand high temperatures of 1800 ºC.|
|Robert C Pullar, Researcher
University of Aveiro / CICECO - Aveiro Institute of Materials