(1) Ceramic fiber does not expand when heated
Many objects in nature have the properties of thermal expansion and contraction. However, the ceramic fiber will not expand after being heated, but will also have a shrinkage rate of 0.03. The reason lies in the structural characteristics of the ceramic fiber itself.
The structure of ceramic fiber is a mixed structure composed of solid fiber and air, and its microstructure is characterized in that both the solid phase and the gas phase exist in the form of a continuous phase. In this structure, the solid matter exists in the form of fibers with a diameter of 2 to 5 Um and a length of 30 to 250 mm, and constitutes a continuous solid phase skeleton, while the gas phase is continuously present in the skeleton gap of the fiber material, and the porosity is greater than 90 %.
Therefore, the expansion of ceramic fiber after heating will be folded away by its own pores, and it will not be too obvious. This is the reason why ceramic fiber products do not expand after being heated.
(2) Ceramic fiber anti-shrinkage at high temperature
In the process of high temperature furnace application of ceramic fiber products, due to the long-term high temperature environment, the fiber filaments constituting the solid phase skeleton will collapse due to their own weight or brittle fracture, resulting in the collapse of the skeleton, the aggregation of fiber filaments, and the reduction of void space. Therefore, the ceramic fiber products will have a certain shrinkage, the shrinkage rate is generally less than 0.03.
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