화학공학소재연구정보센터
Thermochimica Acta, Vol.339, No.1-2, 111-116, 1999
Thermoanalytic measurements with oxides at temperatures up to 2000 degrees C
DTA/DSC setups by different commercial suppliers allow nowadays routine thermoanalytic investigations in different atmospheres (reductive, oxydizing, partially reactive) for t less than or equal to 1600 degrees C. Measurements at higher t less than or equal to 2000 degrees C are only possible within inert atmosphere (noble gases), as the relevant construction materials are sensitive with respect to other gases. This circumstance, together with the small palette of construction and crucible materials, reduces the possibilities for thermoanalytic measurements, especially for oxides. The paper discusses some properties of construction materials that are used for measurements in metal oxide systems. It turns out, that thermoanalytic measurements with some oxides are impossible within commercial DTA setups. In any case, TG and mass spectrometer data need a detailed discussion if obtained at high temperature, as chemical interaction of species present within the emanating gas with constructive parts of the apparatus have to be taken under consideration.