refractory

Ceramic fiber, as a new refractory insulation material, has been one of the most popular insulation materials. It is mainly composed of SiO2 and Al2O3 and has high refractoriness over 1580℃.

The insulation mechanism of ceramic fiber can be explained in the following aspects:

(1) Poor heat transfer capability
Ceramic fiber is non-directional intertwined. Heat is transferred along the fiber, but the non-directional interleaving slows the heat transfer. Besides, when fiber is in contact with the hot face, it is seldom vertical contact. This makes it difficult for heat to transfer to fiber. When the contact points of the fiber reach 80%, heat transfer resistance gets higher. Since fiber itself is opaque, heat rays in the fiber cannot pass. And the area of fiber is small, so it receives less radiation and heat radiation is basically not transmitted in the fiber.

(2) Poor convective heat transfer capability
When fibers are intertwined together, a lot of gas chambers are formed. Those gas chambers are filled with still air. Air has poor heat transfer capability and prevents the invasion of hot air flow.

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