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A critical property of refractory material is the ability to resist stress without destruction upon being subject to the repeated and sudden temperature changes.
At PLIBRICO our R&D technicians have designed and built our own prototype lab testing equipment, which operates with an automatic air-cooling system.
Using ultrasonic signal transition, we can determine the extent of material destruction under strictly controlled thermal conditions - through several heat up & cooling cycles.
Thermal shock resistance testing indicates further possible areas of application for the refractory material.
Procedure:
3 test bars - shape B - are prefired. 2 of them are placed in the furnace, which operates under the standard conditions:
- 950°C
- 7 cycles
- 5 min cooling with compressed air / 1 bar at the nozzle
The ultrasonic speed is measured before and after the test. The modulus of rupture (MOR) is determined on both the stressed and unstressed sample (at 3). The % decrease in the ultrasonic speed and the % residual MOR indicate the resistance to thermal shock.
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