In the laboratory, the rheological characteristics (flow and viscosity curves, dependence of dynamic viscosity on temperature, or chemical composition) of not only inorganic melts (glasses, casting powders, slags, metal melts) up to 1550 °C can be investigated. The high-temperature rotational rheometer measures the torque of a spindle (speed range 0 - 200 min-1) rotating in a fixed crucible containing the sample. The material of the crucible and spindle varies according to the type of sample to be measured. Graphite is used for oxide systems, and high-purity corundum is used for metallic systems. Measurements can be made in air or a flow-through atmosphere of a suitably selected inert gas. The temperature dependence of viscosity can be measured during heating or cooling at the optimum shear rate, which is determined before the measurement. The optimum shear rate value is selected based on evaluating the flow curves. When testing casting powders, slags, or agglomerates, a 150 g powdered sample is required, and a 27x40 mm cylinder is needed for metallic materials.
Equipment:
- Anton Paar FRS 1600 high temperature rheometer
Contact person: doc. Ing. Řeháčková Lenka, Ph.D.
Equipment:
- Immersion rotational viscometer: Rheotec
- Capillary viscometer and stalagmeter set
- Flow visualization kit + image analysis software
- Densitometer AntonPaar DMA 4500
- Submersible rotational viscometer: Brookfield DV3T
- Submersible rotational viscometer: Brookfield DV2T
- Haake MARS 60 rheometer
- Tensiometer Kruss K100
- FTIR Nicolet IS5
- Biolin Scientific Attention Theta Flex - contact angles
- Viscometer Anton PaarSVM 3001
Contact person: prof. Ing. Večeř Marek, Ph.D.