Factors affecting the performance of Ceramic Fiber Insulation

Ceramic Fiber Insulation has the characteristics of high-temperature resistance, good thermal insulation performance, good thermal shock stability, convenient and fast construction, etc. Ceramic fiber insulation is currently the most potential energy-saving and environmentally friendly material. However, Ceramic Fiber Insulation products also have shortcomings in their application. When exposed to high temperatures for a long time, due to the crystallization and grain growth of vitreous fibers, high-temperature creep, and other factors, the fiber structure will change. Until the sintering occurs and the fibrous structure is lost, coupled with the influence of the erosion of corrosive furnace gas and the erosion of airflow, it is easy to pulverize and fall off. Next, let's take a look at the factors that affect the performance of Ceramic Fiber Insulation. Here are some answers.

Here is the content list:

l  Temperature factors.

l  Use environmental factors.

l  Impurity factors.

Temperature factors.

From a thermodynamic point of view, glassy ceramic fiber insulation is in a metastable state. So, as long as it is hotted under a certain temperature condition, flyspeck rearrangement will occur inside the fiber, the glass state will be converted into a crystalline state, and the fiber will solidify. When the grain size grows to be close to the periphery of the fiber, the bonding force inside the fiber will be dominated by chemical bonds between motes and will be dominated by grain boundaries between crystal grains. Because the grain boundary bonding force is relatively fragile, it will lead to the strengthening of fiber brittleness. Under the action of external force, the fiber is easily damaged and ultimately loses its fiber parcels.

Use environmental factors.

In a reducing atmosphere, the silica in the fibers of the Ceramic Fiber Insulation easily reacts with carbon monoxide and hydrogen. As the silica is reduced to volatile substances, the fiber structure sluggishly changes and the surface gradationally becomes rough. When mullite grains are formed inside the fiber, the fiber is easy to break, which accelerates the deterioration of the fiber.

Impurity factors.

Some impurities present in Ceramic Fiber Insulation materials, such as Fe₂O₃, Na₂O, K₂O, etc., will react with other components in the ceramic fiber to form a eutectic at a lower temperature. The existence of the eutectic destroys the network structure of the fiber, the density inside the fiber is reduced, and the crystallization activation energy that needs to be overcome for the rearrangement of the ion group during crystallization diminishments, and the crystallization temperature diminishments. At the same time, the existence of eutectic accelerated the growth of grains and promoted the powdering of fibers.

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