There are many factors that affect the high temperature creep of refractories, and many of them are interrelated. The main factors affecting the creep deformation of refractory materials are as follows:
4. Mineral composition
As we all know, elastic modulus like melting point and thermal expansion coefficient， also reflect the binding force between atoms and structural energy of materials, which can indicate the ability of materials to resist creep deformation on a macro level. Therefore, crystals, ionic crystals and particles with covalent bonds have strong binding force, large elastic modulus and are not easy to deform, while molecular bonds have weak binding force, small elastic modulus and are easy to deform. This is why people choose corundum mullite products as high-temperature creep resistant materials.
From the creep mechanism, we have known that creep is often carried out in the form of grain boundary slip, so for single crystal materials, there are few grain boundaries, and the creep resistance is excellent. On the contrary, for polycrystalline materials, the number of grain boundaries increases, and the slip path increases, and the material is prone to deformation.
Next issue we will continue to introduce factors affecting creep deformation of refractory material. Please stay tuned!