Description

The HTVP1600 furnace is designed to perform impulse excitation measurements at elevated temperatures up to 1600 °C in an air, inert or reducing atmosphere. Measurements can be performed in predefined intervals during heating and cooling (1-5 °C/min) in order to determine the elastic properties and damping as function of the temperature. The adjustable positioning of the excitation system and the top hat system guarantee an optimal sample configuration and manipulation.The HTVP1600 furnace is equipped with a rotary vane vacuum pump to perform measurements in a controlled atmosphere (air, inert, reducing, ...).

Specifications

Internal dimensions of the furnace
Diameter: 170 mm
Height: 180 mm
Temperature range
Room temperature - 1600 °C
Heating elements
MoSi2 heating elements (8 pieces)
Heating/cooling rate
1 - 5 °C/min
Isolation material
Al2O3 (PCW)
Furnace wall cooling
Water jacket
Atmosphere
Air, inert or reduced
Vacuum pump
Rotary vane pump
Minimum pressure
1 mbar
Furnace (sample) loading
Top hat
Number of samples
1
Max. length of sample
120 mm
Positioning excitation system
Adjustable
Positioning microphone
Fixed (3 positions)

Measurement examples

  • Sintered silicon nitride sample

    Sintered silicon nitride is the leading ceramic for high load structural applications. The internal friction behavior can give information about the crystal structure together with the fatigue resistance. 2 internal friction peaks can be observed.
    - P1: Si3N4 contains a secondary, intergranular phase. This phase is (partially) amorphous, and softens above its glass transition temperature (typically near 1000°C). This triggers viscous deformation of the bulk ceramic and consequently increases the internal friction. For cyclically loaded components operating near this peak, this energy dissipation constitutes an effective increase in fracture resistance.
    - P2: Around 1300°C, a local increase in the resonant frequency can be observed which points to stiffening of the material. This stiffening is typically the consequence of crystallization which indicates that the second internal friction peak is caused by the crystallization of the amorphous intergranular phase. During cooling, when the crystallization is completed, the peak doesn’t return.

  • Refractory materials

    Refractory materials must be chemically and physically stable at high temperatures. Especially for these porous materials, the impulse excitation technique can be successfully applied due to the small mechanical forces avoiding internal material deformations. The refractory sample is measured starting from the green stage up to 1550°C at 3 °C/min, stayed at 1550 °C for 30 minutes and cooled down at 3 °C/min. Measurements were taken every 2 minutes. The different phase transformations are clearly observed during the heating and cooling phase. Furthermore, the technique can also be used to study the thermal shock behavior of refractory materials.