Explanation

An experimental technique for studying the various changes that occur during the temperature change of a substance. It has extensive applications in metallurgy, chemical engineering, pharmaceuticals, mineral and material science research. thermal analysis is the study of internal physical and chemical changes (such as phase transition, melting, solidification, etc.) in a substance through the phenomenon of heat absorption or release during the heating or cooling process, known as the thermal effect. thermal analysis can be divided into simple thermal analysis and DTA. The former has less interference factors on the analysis curve, but has lower sensitivity. DTA records the temperature difference between the studied sample and the reference sample that does not change within the studied temperature range under identical heating conditions over time or temperature, and obtains the DTA curve. When the sample does not change, the curve is a horizontal straight line, and the abrupt changes on the curve reflect the internal changes of the sample. The sensitivity of DTA is very high, as high sensitivity instruments can display small temperature difference signals. The DTA device consists of a sample container, temperature measurement and temperature difference thermocouples, temperature control system, vacuum and atmosphere regulation system, recording system, and computer control system. The temperature range used is generally between -196 ° C and -196 ° C? 150CTC. DTA technology is essentially a technology for temperature measurement and recording under specific thermal transformation conditions, with many influencing factors. Such as the characteristics of the device itself and the tested sample, the matching of thermal properties between the sample and the reference sample, the correct selection of atmosphere, control of sample size and temperature rise and fall rate, and other factors that may affect the reliability of DTAn.

Classification