Influencing factors of thermal shock resistance of alumina ceramics
1. Influence of the microstructure of alumina ceramics
The microstructural characteristics of alumina ceramics, such as grain size, microcracks, porosity and pore distribution, etc., will have an important impact on its thermal shock resistance.
2. Influence of surface condition
Alumina ceramics usually require some mechanical processing methods to treat the surface before use, such as grinding, polishing, milling, etc., resulting in changes in surface roughness. The thermal shock resistance of the surface of alumina ceramics after grinding and polishing respectively, it was found that the surface of Al2O3 ceramics after grinding has better thermal shock resistance.
3. The effect of geometric dimensions
The thermal shock resistance of alumina ceramics is also affected by the geometry of the ceramics. Generally, reducing the thickness of the ceramic can increase the critical thermal shock temperature difference of the ceramic, which is mainly due to the internal bending impulse generated by the bending stress.