Sintering is a process in the production of aluminum silicate ceramic fiber paper, which is divided into three stages before sintering, during sintering and after sintering. Among them, there are some corresponding changes during this period. I hope you can find the following Better solve and deal with in the introduction:
1. Before sintering: In this process, the manipulation of air temperature is very critical. As the temperature rises, the body of aluminum silicate ceramic fiber paper shrinks, but the change in density and intensity is not large, and the microstructure is crystallized. There is no change in the proportion of particles. At this stage, the green body is very easy to split. Since the moisture and binder are eliminated, the heating rate should be paid attention to.
2. Initial sintering: When the temperature changes slightly, the volume of aluminum silicate ceramic fiber paper shrinks, and the density and the like will undergo very, very large changes. Although there is still no significant change in the proportion of grains in the microstructure, but between particles No longer is the joint thick, and the pores are also greatly reduced. At this stage, the volume of the green body due to sintering shrinks, which is easy to cause the green body to split and deform.
3. At the end of sintering: the temperature rises and all changes are deeper than before. Aluminum silicate ceramic fiber paper is almost inconvenient after the density and shock changes reach the maximum. The proportion of crystal grains in the microstructure changes significantly, the pore changes are smaller, and they are not connected to each other, forming isolated pores, some of which are left in the grains.
At the same time, the grain growth at the end of sintering will cause the reaction of aluminum silicate ceramic fiber paper. In order to avoid bad reactions, adding additives to inhibit the growth of grains can restore the characteristics of the product. Therefore, when sintering, pay attention to different periods. Better product
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