The HT1700 furnace is designed to perform impulse excitation measurements at elevated temperatures up to 1700 °C in an air atmosphere or with an inert gasflow (optionally) on 2 samples simultaneously. 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 microphone and the bottom loading of the sample guarantee an optimal sample configuration and manipulation. Optionally, a dilatometer can be mounted on the system to measure the linear expansion simultaneously with the elastic properties.
|Internal dimensions of the furnace||Width: 148 mm
Depth: 208 mm
Height: 176 mm
|Temperature range||Room temperature – 1700 °C|
|Heating elements||MoSi2 heating elements (8 pieces)|
|Heating/cooling rate||1 – 5 °C/min|
|Isolation material||Al2O3 (PCW)|
|Furnace wall cooling||Water jacket|
(optionally with gas flow)
|Furnace (sample) loading||Bottom load|
|Number of samples||2|
|Max. length of sample||160 mm|
|Positioning excitation system||Adjustable|
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The obtained elastic properties at elevated temperatures give a detailed insight into the extend of material bonding and its behavior under stress and rude conditions around 1600°C. The Young’s modulus curve decrease significantly at around 300°C which is characteristic of the dehydration of the cement in the concrete. After 800°C, the Young’s modulus increase up to the maximum temperature which indicates a sintering process in the material. The damping phenomena are high at about 880°C and 1284°C characterizing the imperfection that occur during the crystallization of cement component and fine element in the castable refractory material. After heating and subsequent cooling, the final Young’s modulus was around 38 GPa.