To obtain a temperature measurement nearer the sample, a sample-holding rod hung from the balance is used. The measuring supplier of thermocouple can be placed on the bottom of the crucible or within the sample (if sample-thermocouple compatibility permits). Control the rate of reaction The various SETSYS Evolution TGA models are controlled by the computer as a function of the temperature cycle where the temperature-scanning rate is linear. For certain applications (decomposition, sintering), the rate of variation in mass must be controlled. A "controlled-rate thermogravimetry" software provides for such operations. Applications of the SETSYS Evolution TGA models are very varied: dehydration, dehydroxylation, pyrolysis, decomposition of minerals and organic matter, oxidation and combustion of organic products and fuels, degradation of polymers, characterizing of ceramics, oxidation of alloys. Having the possibility of choosing the atmosphere and varying it during the analysis is a great advantage when studying the thermal behavior of materials in an inert or reactive atmosphere as well as for analyzing composition. • Devices for good sample-gas exchange To study the oxidation of a metal, it is possible to hang the sample directly from the balance suspension. The sample can be a plate measuring up to 13 mm x 30 mm providing an active surface of 7.8 cm2 (figure ©). When the sample is in powder form, the three-tray vessel is most useful as each tray has a surface area of 1.33 cm2, therefore the powder can be spread over a total surface area of 4 cm2 (figure ©). For studies at high temperatures, you can also use a suspension rod + vessel made entirely of sapphire. The advantage of sapphire over platinum is that it is inert to oxidation. Measurement under controlled humidity atmosphere Humidity is known to considerably affect the stability of many products such as pyrotechnical materials, polymers, pharmaceutical products, foodstuffs, plasters, cements, metals and alloys, etc. To evaluate the influence of humidity on the long term stability of these products, it is necessary to specifically study their behavior under relative humidity. Thus SETARAM has developed a controlled humidity generator WETSYS*, designed to offer you the following possibilities: • Generation of precise and controlled humidity, analysis instruments. |