Refractory Fiber Products Temperature Classification
Refractory fiber can also be called ceramic fiber, is a kind of fiber insulation refractory. Developed in 1941, it can be used for paper, line, rope, etc.
Refractory fibers are divided into amorphous (glass) and polycrystalline (crystalline) types. Amorphous refractory fiber, including aluminum silicate, high purity silicate, aluminum silicate and high alumina refractory fiber. Polycrystalline refractory fiber, including mullite fiber, alumina fiber and zirconium oxide fiber. (table 1) also can be classified according to the highest permissible temperature according to the refractory fiber.
Refractory fiber is also a good infrared radiation material with good thermal power and infrared heating effect. The use of refractory fiber products can effectively save energy and is an ideal material for energy conservation and efficiency. Production practice proved that the application of continuous heating furnace refractory fiber can energy saving more than 15%, over 30% of energy can be used for batch industrial furnace, can improve the work efficiency and improve product quality at the same time, realize the light body structure, large-scale, comprehensive performance is good.
Refractory fiber and soft, good elasticity, or ideal sealing material, because of the insulation, noise elimination, oxidation resistance, oil resistance, water resistance, convenient construction, metallurgy, building materials, petroleum, chemical, shipbuilding, electric power, aerospace and other fields are widely used.
Polycrystalline refractory fiber after amorphous refractory fiber in the early 1970 s to develop a new type of high temperature heat insulation material, mainly used for working temperature higher than 1400 ℃ high temperature furnace, energy saving 25% ~ 40%. Polycrystalline refractory fiber can also be used as a composite and catalyst carrier. Multi-crystal refractory fibers can also be used in the space missile and atomic energy field. Have polycrystalline international industrial production and application of refractory fiber, polycrystalline alumina fiber (Al2O380 % ~ 90%, SiO221 % ~ 20%), the polycrystalline mullite fibre (al2o372 % ~ 79%, SiO221 % ~ 28%) and polycrystalline zirconia fibers (Y2O38 ZrO292 %, %), etc.
Energy problems have caused wide public concern all over the world. On the one hand, energy consumption increases year by year.
On the other hand, energy utilization rate is still very low, in China this contradiction appears particularly prominent. Blast furnace in the energy efficiency in China is only 50% ~ 60% in developed countries, of energy-saving material research and development has become a pressing task of materials, refractory fiber, because of its good thermal insulation performance, is the development of energy-saving materials.
The research and development of multi-crystal refractory fiber abroad has been developed earlier, the production technology is mature and the technology is stable, and the comprehensive properties of fiber products have been applied in many fields.
Polycrystalline alumina fiber as the main variety of multi-crystal refractory fiber, high cost performance and high commercial value. Since the 1970s, many developed countries have invested a lot of energy in the development of polycrystalline alumina fiber. Britain's ICI company, the company has more than 20 years of history to produce polycrystalline alumina fiber, polycrystalline fiber production using temperature is 1600 ℃. Foreign polycrystalline refractory fiber is not only used as high temperature insulation material, but also as an enhanced material for advanced ceramics, metals and plastics.
Domestic polycrystalline refractory fiber mainly polycrystalline mullite fiber and polycrystalline alumina fiber, in the late 1970 s, the luoyang refractory materials research institute and Shanghai second refractory plant began to make polycrystalline mullite fiber. At present, the polycrystalline rock produced in China is made of aluminum chloride aqueous solution and metal aluminum powder. Mainly used for temperature 1350 ℃ ~ 1400 ℃ ceramic veneers. Luoyang refractory materials research institute of the development and production of polycrystalline alumina fiber (Al2O380 % ~ 95%) is mainly used in 1500 ℃ ~ 1650 ℃ high temperature furnace, the annual output 80 tons.
Refractory fiber under high temperature (1000 ~ 1400 ℃), vibration, heat resistance, sound absorption and the advantages of light weight, has replaced the brick and refractory castable, heat preservation, heat insulation, sound insulation, fire prevention materials, in metallurgy, petroleum, chemical, machinery, building and other industries widely used. The construction technology of traditional refractory fiber mainly refers to the construction technology of refractory fiber products. The construction is difficult, the construction difficulty is big, the speed is slow, the quality control is difficult, the seam is much, the overall quality is poor, the control worker labor intensity is big, the environment is bad. Fireproof fiber spraying technology is a new kind of fiber construction mechanization technology. The technology USES a fiber spray gun, which is sprayed evenly on the diaphragm pump through the diaphragm pump, and shoots it directly to the working surface to form the product structure of the three-dimensional network structure. Overcoming the disadvantages of traditional building technology is beneficial to the thermal efficiency of advanced industrial furnace.