In 1941, Babcock & Wilcox of the United States melted natural kaolin in an electric arc furnace and then blew it into fibers, naming it "Ceramic Fiber". Ceramic Fiber refers to a fibrous refractory material mainly made of aluminum silicate, which belongs to the category of lightweight high-temperature resistant thermal insulation materials.
Ceramic fiber modules are widely applied in industrial furnaces and various thermal equipment due to their excellent thermal insulation, thermal stability and remarkable energy-saving effects. However, in certain furnace chambers, ceramic fiber modules cannot be used as the working layer in direct contact with the furnace atmosphere.
This is because the gases generated or volatilized inside such furnaces contain large amounts of hydrogen (H₂), carbon monoxide (CO), ammonia (NH₃), methane (CH₄) and other components. In such gaseous environments, especially at high temperatures, refractory fibers will undergo structural changes. When ceramic fibers are directly adopted as the working layer, these atmospheres will cause structural damage to refractory fibers, manifested as accelerated crystallization rate and lowered pulverization temperature.
Therefore, when ceramic fiber modules are used in the following types of furnaces, they can only serve as the thermal insulation layer on the non-working surface, i.e., the furnace chamber temperature ranges from 950℃ to 1250℃.
Various medium and low-temperature furnaces under reducing atmosphere, such as carburizing furnaces, vacuum furnaces, etc.;
Various furnaces with protective non-inert gases and furnaces where various gases are volatilized from the heated workpieces during production, such as aluminum melting furnaces, paraffin shell roasting furnaces for special casting, etc.
Solution
Lay one layer of refractory bricks with matching material and functional performance on the hot face. Between the refractory brick layer and the metal furnace wall, adopt Aladdin ceramic fiber modules and ceramic fiber blankets of suitable material grade.
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