Thermal shock damage of high temperature alumina ceramic rollers

Time:2018/8/13 17:32:42 Click on:

The thermal vibration damage of high temperature alumina ceramic rollers is based on the theory of thermoelasticity, which means that the thermal strength of the material is insufficient when it is insufficient to resist the thermal stress caused by the thermal shock temperature difference. 

According to this theory, ceramic materials have high thermal shock resistance if they have high strength, thermal conductivity and low thermal expansion coefficient, Young's modulus of elasticity, Poisson's ratio, thermal emissivity and viscosity. In addition, appropriately reducing the density and heat capacity of the material also contributes to improving the thermal shock resistance of the ceramic material.

The other type is based on the concept of fracture mechanics. When the thermoelastic strain in the material is sufficient to pay for the nucleation and expansion of the crack and the energy required for the new surface, the crack forms and diffuses, resulting in thermal shock damage to the material. According to this theory, materials with good thermal shock resistance should have the highest possible modulus of elasticity and the lowest possible strength.

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