– Gravimetric measurements
In laboratory measurement systems, thermogravimetric analysis is a standard method used to record the behaviour of a substance as a function of time and temperature. For this purpose, the substance is placed in a crucible that should not influence the behaviour of the substance during analysis. As the container, often thin-walled crucibles made of high-purity, dense-sintered Al2O3 ceramics are used.
Properties of such a ceramic typical for this applications are listed in the following:
- Purity >99.5 %
- Density >98 % of the theoretical value
- Thermal stability to around 1800 °C
- High resistance to thermal shock
- High resistance to deformation even at a high temperature level
- High corrosion resistance
- Wall thickness in the range of 0.5 mm
In some cases, crucible materials made of Al2O3 ceramic with the above-mentioned properties have been part of the introduced standard in TGA analysis for decades.