ŽALUDOVÁ Monika VŠB - Technická univerzita

Spoluautoři SMETANA Bedřich, ZLÁ Simona, DOBROVSKÁ Jana, ROSYPALOVÁ Silvie, PETLÁK Daniel, SZURMAN Ivo, ŠTVRTŇOVÁ Alice

Differential thermal analysis (DTA) and Differential Scanning Calorimetry are one of the methods these are suitable for obtaining thermo-physical and thermo-dynamical data. Determination of temperatures and latent heats of phase transformations of metallic systems is possible using these methods. This paper deals with the influence of the experimental conditions settings of the used DTA and DSC methods in connection with obtained data. The paper is focused on the study of heating/cooling rate and sample mass influence on shift of phase transformations temperatures and size of the latent heats of “pure Fe”. Sample mass and heating/cooling rate are one of the frequently and easily changing parameters and their influence on the obtained data is substantial. Study was aimed on both low temperature and high temperature region. DTA measurements were realised using Setaram Setsys 18TM laboratory system and DSC measurements using Setaram MHTC laboratory system. The samples of “pure Fe” (with different mass) were analysed at several controlled heating/cooling rates. On the basis of adjusted experimental conditions (different heating/cooling rates and different sample masses), the experimental data set was obtained and corresponding dependencies were derived. Using corresponding dependencies the corrections can be applied to lower experimental conditions influence of studied data for investigated alloys (samples). Application of derived dependencies can substantially lead to lowering (minimizing) the experimental conditions influence and extrapolation to the so called “zero” mass and “zero” heating rate is possible.

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