RT Journal Article
T1 Thermophysical properties of porous Ti2AlC and Ti3SiC2 produced by powder metallurgy
A1 Tsipas, Sophia Alexandra
A1 Tabares Lorenzo, Eduardo
A1 Weissgaerber, Thomas
A1 Hutsch, Thomas
A1 Sket, Federico
A1 Velasco Núñez, Beatriz
AB The physicochemical properties of porous Ti2AlC and Ti3SiC2 MAX phase compounds with controlled porosity and grain size obtained by powder metallurgy techniques was studied in depth in order to access their suitability of applications such as catalytic devices on vehicles, heat exchangers or impact resistant structures. The study was performed on isostatic consolidated samples with different amount (20-60 vol%) and size of space holder (250-1000 µm) and in samples without space holder. Oxidation tests were performed at different temperatures for each material depending on their maximum service temperature. In order to understand the oxidation mechanism, oxidation kinetics were analysed to determine the influence of size and amount of porosity in each case. In addition, the microstructure and composition of the oxide layers formed after the tests were analysed by scanning electron microscopy (SEM). Electrical and thermal conductivity where studied at room temperature and at temperature up to 1000 degrees C. The effect of pore size and cell wall thickness is discussed. Permeability of foams was also measured. The effect of micro porosity and macro porosity on permeability is discussed. The coefficient of thermal expiation was also measured for all foams produced. It is established that these porous MAX phases have suitable properties for their use as catalytic substrates, heat exchanges, high temperature filters or volumetric solar receivers.
PB Elsevier
SN 0925-8388
YR 2021
FD 2021-03-15
LK https://hdl.handle.net/10016/37211
UL https://hdl.handle.net/10016/37211
LA eng
NO This research was funded by the Regional Government of Madrid (program ADITIMAT-CM. ref. S2018/NMT-4411) and by the Ministry of Economy and Competitiveness of Spain (program MINECO Ramón y Cajal contract RYC-2014-1504). Dr. Beatriz Valasco is grateful for the funding provided by the Insitituto Alvaro Alonso Barba (Universidad Carlos III de Madrid) for the research stay at the IFAM. Dresden.
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RD 27 jul. 2024