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Thermal insulation mechanism of ceramic fiber blanket

Thermal insulation mechanism of ceramic fiber blanket

In addition to H2, many gases, including air, are low heat capacity in non-moving state and have low thermal conductivity.

The thermal conductivity of the ceramic fiber blanket is only 0.03 w/mk at normal temperature. This is because the ceramic fiber generates a large number of voids in the process of interlacing the solid fibers, and the voids are filled with air, and the filling of a large amount of air is destroyed. Original continuous network structure, so that ceramic fiber has excellent thermal insulation properties

Since the ceramic fiber does not have any directionality during the interweaving process, the heat conduction can only proceed in the direction of the fiber rod, and the fiber rod is not perpendicular to the ground, and has a certain inclination, which leads to an extension of the heat propagation path.

In addition, since 80% of the fibers are in point contact, the thermal resistance of heat conduction is further increased, so that the effect of relying on fibers to conduct heat inside the ceramic fiber blanket is not obvious.

Because there are a large number of voids inside the ceramic fiber, the gas is divided into a plurality of small gas empty cells by the fiber.

Since the pressure inside the dispersed multi-aperture chamber is constant, the gas will form a dense solid shield with the solid fibers to impede the intrusion of the hot gas stream.

Since the gas is almost in a stationary state, the heat absorbed by the gas can only be transmitted inside the gas in a conductive manner, and since the gas has a small thermal conductivity in a static state, the heat transfer effect of the heat depends on the gas is not obvious. .