Low-end ceramic fiber application
Ceramic fiber is the high-quality refractory and thermal insulation material, which meets the needs of downstream industries for "more energy-saving, more environmentally friendly, and safer". At present, the annual output of domestic ceramic fiber products is about 700,000 tons, accounting for about 2.9% of refractory materials. The base is small, and the future The expansion of each subdivided application field will bring higher growth. Ceramic fiber products are not completely standardized products. It is necessary to adjust the ingredients, process and technical support when used in different fields. Therefore, the application of non-standard aspects has been expanded with the development of the entire industrial system.
A: High temperature insulation material
Ceramic fiber is a high-efficiency energy-saving thermal insulation material. The material itself has the characteristics of ordinary fibers, and at the same time has high temperature resistance, corrosion resistance and oxidation resistance that ordinary fibers do not have. More importantly, it avoids the brittleness of general refractory materials. To a certain extent, it replaces traditional heavy refractory bricks and is used as lining material for industrial kilns. The biggest advantage of the industrial kiln built with ceramic fiber as the kiln wall is energy saving. For example: Polycrystalline mullite fiber fiber products can be used as thermal insulation materials in high-temperature thermal equipment below 1600 °C for a long time, such as silicon carbide electric furnaces, molybdenum silicide electric furnaces, various steel heating furnaces, mechanical forging furnaces, etc., which can significantly improve The thermal efficiency of equipment can greatly save energy, increase productivity and improve product quality. It can be applied to heat insulation of various high-temperature industrial kilns; ceramic kilns; mechanical and metallurgical heating furnaces; heat treatment furnaces and other industrial kiln hot surface linings; high-temperature fire and flame insulation; kiln doors, kiln cars, expansion joints, etc. Insulation materials; glass kiln insulation.
B filter material
Due to its high strength, good thermal shock resistance, and chemical corrosion resistance, ceramic fiber materials have been widely used in air purification, high-temperature flue gas filtration, diesel engine exhaust microfiltration capture, chemical filtration, and molten metal filtration. Ceramic fiber filters can be divided into ceramic fiber composite membrane materials, ceramic fiber paper, ceramic inner net (cloth), and ceramic fiber filter body.
C sound-absorbing and sound-insulating materials
Ceramic fiber products are porous aggregates of fine fibers, which have excellent sound absorption and sound insulation properties. First of all, because the fiber product itself has many small pores connected between the fibers, when the sound wave is incident on the fiber material and propagates inside it, the viscous resistance of the air in the pores and the frictional resistance between the fibers will Part of the sound energy is converted into heat energy to form a loss.
D Application of advanced ceramic fiber materials
The application of advanced ceramic fiber is different from that of traditional ceramic fiber. The key point is that according to the characteristics of the fiber itself, in addition to utilizing its high temperature resistance, heat insulation and fire resistance, it also amplifies its other functional characteristics, such as its own wave absorption. resistance, corrosion resistance, weather resistance, etc.
Ceramic fiber itself is a semiconductor and is an important material for radar wave absorption. It also has ideal structural material properties such as light weight, high strength, high temperature resistance, and oxidation resistance. By changing the crystal structure through the preparation process, the resistivity of the fiber can be adjusted, and then multi-layered to achieve the purpose of absorbing and transmitting waves. Ceramic fiber reinforced composites can directly prepare stealth structural parts, which have higher strength and high temperature resistance than stealth coatings. The F-22 uses ceramic-based stealth structural materials near the tail nozzle; the tail of the French APTGD missile is composed of hexagonal small pieces of ceramic wave-absorbing material, which has a good wave-absorbing effect; the U.S. Air Force has developed a Si3N4 broadband transparent Wave radome.
