Refractory materials with good thermal shock resistance should have the following key properties:
1. Stable chemical composition and microstructure
Stable chemical composition: The chemical composition of refractory materials should be stable and not easy to decompose or change phase at high temperature, thereby generating additional thermal stress.
Uniform microstructure: The grain size, morphology and distribution of the material should be uniform to avoid local stress concentration. At the same time, the appropriate amount of microporous structure helps to quickly conduct and release heat and alleviate the stress shock caused by sudden temperature changes.
2. Excellent thermophysical properties
Low thermal expansion coefficient: Low thermal expansion coefficient means that the material generates less thermal stress when the temperature changes, which helps to improve its thermal shock resistance.
High thermal conductivity: High thermal conductivity helps to quickly balance the heat inside the material, reduce local overheating and stress concentration, and thus improve thermal shock resistance.
3. High strength and toughness
High compressive strength: Refractory materials should be able to withstand pressure at high temperature without deformation or damage.
High toughness: Good toughness enables the material to absorb energy through plastic deformation when subjected to thermal stress shock, thereby avoiding brittle fracture.
4. Good thermal shock resistance test performance
Stable performance after multiple thermal cycles: In the thermal shock resistance test, the material should be able to withstand multiple thermal cycles without obvious performance degradation.
Low thermal shock damage: After the test, the material's heating surface damage, mass loss rate, strength loss rate and other indicators should remain at a low level.
5. Ability to adapt to complex working environments
Adapt to rapid temperature changes: In industrial production, refractory materials often face rapid temperature changes, so they should have good thermal shock resistance.
Slag resistance and erosion resistance: In addition to thermal shock resistance, refractory materials should also have excellent slag resistance and erosion resistance to ensure their long-term stable operation at high temperatures.
6. Performance in practical applications
Long service life: Refractory materials with good thermal shock resistance often have a long service life in practical applications, which can reduce the frequency of replacement and maintenance.
Improve production efficiency: Stable refractory performance helps to improve the operating efficiency and production quality of industrial furnaces.
Refractory materials with good thermal shock resistance should have stable chemical composition and microstructure, excellent thermophysical properties, high strength and toughness, good thermal shock resistance test performance and the ability to adapt to complex working environments. These properties together determine the stability and reliability of refractory materials in industrial environments with high temperatures and frequent temperature changes.
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