Factors Affecting Creep Deformation of Refractory Material 4

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:
5. Microstructure
① The creep of crystalline refractories is mainly determined by their microstructure. For crystals, the microstructure is not only shown in their properties such as melting point, elastic modulus, etc, but also depends on their size, shape and bonding state, that is, the interface structure factor of crystals.
② The glass phase is particularly important for the creep property of refractory material. Because it is a continuous liquid phase in the material at high temperature, its distribution affects the creep of refractory material in varying degrees.
③ Most of the pores in porous refractories exist in the form of cracks, so their shape, size, distribution, and these structural factors can affect the creep. For dense sintered materials, the change of pore size and pore size have little effect on the creep deformation rate, mainly the effect of porosity. The higher the porosity, and the lower the stress concentration. Moreover, on the surface of pores, defects are highly concentrated, which is easy to cause grain boundary slip and diffusion and reduce the creep resistance.
Next issue we will continue to introduce factors that affect the high temperature creep of refractories. Please stay tuned!