Macroporous ceramics for thermal insulation at high temperatures derived from greener and ultrastable liquid foams

Reference Presenter Authors
14-030 Tiago dos Santos Junior Santos Junior, T.d.(Universidade Federal de São Carlos); Pereira, C.I.(Universidade Federal de São Carlos); Salvini, V.R.(Faculdade de Tecnologia); Pandolfelli, V.C.(Universidade Federal de São Carlos); Thermal insulation is a key factor in the performance of systems which operate or are exposed to high and ultra high temperatures. Whether the objective is to reduce thermal energy losses or to protect sensitive systems from the external temperature, an insulation lining is needed. Macroporous refractory ceramics are candidate materials to thermal insulation as they withstand elevated temperatures and present low thermal conductivity. These materials can block heat transportation by phonons, photons and fluids and their thermal properties are directly associated with mineralogical composition and microstructure. Regarding the microstructure, the pore amount and pore size are the main aspects pointed out to be connected with the thermal conductivity of the material and can be adjusted during the processing route. Considering macroporous ceramics produced by direct foaming, the control of pore amount and size depends on the ageing kinetics of the liquid foam (drainage, coarsening and coalescence of bubbles) prior to solidification. These ageing phenomena can be controlled if ultrastable foams are used. Based on that, the production and properties of novel macroporous ceramics derived from greener ultrastable liquid foams in which bubbles are stabilised solely by ceramic particles, will be presented and discussed in this talk. Some processing routes to achieve optimal microstructures to minimise heat transportation will be highlighted, and their performance in the thermal insulation will be presented.
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