In the laboratory, we can investigate the rheological characteristics, such as flow and viscosity curves, the dependence of dynamic viscosity on temperature, and the impact of chemical composition. This applies to inorganic melts, including glasses, casting powders, slags, and metal melts, at temperatures up to 1750 °C. Measurements can be conducted in either air or an inert gas atmosphere that is appropriately selected. The temperature dependence of viscosity can be measured during both heating and cooling at an optimal shear rate, which is determined prior to the actual measurement. Additionally, we can perform dynamic mechanical analysis on solid samples through three-point bending, tension, pressure, and torsion, starting from temperatures as low as -100 °C. Our laboratory also allows for the experimental determination of surface and interfacial characteristics, including evaluation of surface and interfacial tension, wetting angles, adhesion work, and the spreading coefficient at temperatures up to 1600 °C. Softening and liquidus temperatures can be examined by capturing the shape changes of specimens during heating or cooling using a CANON EOS 550D camera. Furthermore, measurements can be carried out under vacuum conditions (approximately 1 Pa) or in a flow atmosphere of an appropriately selected inert gas.
Instruments:
Anton Paar FRS 1600 and FRS 1800 high-temperature rheometers
- rheological characterisation of Newtonian and non-Newtonian mainly inorganic melts (flow and viscosity curves, temperature dependence of dynamic viscosity)
- determination of melt density
- measurements up to 1 550 °C (FRS 1600) and 1 750 °C (FRS 1800)
- rotational or oscillatory measurement mode
- corundum or graphite measuring system
- flow-through inert atmosphere
Anton Paar MCR 702e MultiDrive modular compact rheometer
- rheological characterisation of samples in the low-temperature range from -100 °C to 1,000 °C
- density determination of melts
- rotary or oscillatory measurement mode
- dynamic mechanical analysis of solid samples (three-point bending, tension, pressure, torsion)
- inconel 600 alloy measuring systems
- flow-through inert atmosphere
- cooling by liquid nitrogen
High-temperature, observation, resistance furnace Clasic with a CANON EOS 550D camera
- determination of surface and interfacial characteristics (surface and interfacial tension, wetting angles, adhesion work, spreading coefficient) of not only inorganic melts
- determination of softening and liquidus temperatures using shape changes of the sample during heating
- investigation of the interaction at the phase interface
- use of the sessile drop method
- measurements up to 1 600 °C
- measurements under vacuum (approx. 1 Pa) or in a flow-through inert gas atmosphere
Contact person: doc. Ing. Řeháčková Lenka, Ph.D.
Associates: Mgr. Vlastimil Novák, Ph.D., Ing. Sára Leinweberová, Mgr. Dalibor Novák