Sintering is a process in the production of aluminum silicate ceramic fiber paper. It is divided into three stages: before sintering, sintering and after sintering. There are some corresponding changes during this period. I hope you can better solve and deal with it in the following introduction:
1. Before sintering: the control of temperature is very important in this process. With the increase of temperature, the green body of aluminum silicate ceramic fiber paper shrinks, but the change of density and intensity is small, and the grain proportion in microstructure does not change. At this stage, the green body is very easy to crack. Due to the elimination of moisture and binder, pay attention to the heating rate.
2. Initial stage of sintering: when the temperature changes slightly, the volume and density of aluminum silicate ceramic fiber paper will change very, very greatly. Although there is still no significant change in the grain proportion in the microstructure, the particles are no longer spot coarsened, and the pores are greatly reduced. At this stage, the volume of the green body will decrease due to sintering, It is easy to produce green body splitting and forming.
3. At the end of sintering: the temperature rises, and all changes are deeper than before. Aluminum silicate ceramic fiber paper is almost inconvenient when the changes of density and vibration reach the maximum. In the microstructure, the grain proportion changes significantly, the pores change less and are not connected with each other, forming isolated pores, and some pores remain in the grain.
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 adverse reaction, adding additives to inhibit grain growth can restore the characteristics of the product. Therefore, during sintering, attention should be paid to producing better products in different periods
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