1700 Alumina High Temperature Fiber Bulk

1700 Alumina High Temperature Fiber Bulk

Alumina fiber is a polycrystalline inorganic fiber whose main component is alumina. The main crystal form can be γ-, δ-, θ-, α-alumina. Usually it also contains about 5% silica. Stabilize the crystal phase and suppress the growth of crystal grains at high temperatures....

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Alumina fiber is a polycrystalline inorganic fiber whose main component is alumina. The main crystal form can be γ-, δ-, θ-, α-alumina. Usually it also contains about 5% silica. Stabilize the crystal phase and suppress the growth of crystal grains at high temperatures. Alumina fiber is one of the latest ultra-light high-temperature insulation materials at home and abroad. It uses high-tech "sol-gel" method to make soluble aluminum and silicon salt into colloidal solution with a certain viscosity. Centrifugal twisting into fiber embryo body, and then transformed into Al-Si alumina polycrystalline fiber through dehydration, drying and medium-high temperature heat treatment and crystallization, the main crystal phase is mainly corundum phase and a small amount of mullite phase, chemistry The composition is Al2O3 (95%) + SiO2 (5%), the fiber diameter is 3-7um, the length of the monofilament is 10-150mm, the appearance is white, smooth, soft and elastic, especially like absorbent cotton, which is composed of crystal material and fiber. The material characteristics are integrated, the temperature is 1450°C-1600°C, the melting point is 1840°C, and the heat resistance is good. The thermal conductivity is 1/6 of the ordinary refractory brick, the bulk density is only 1/25, and the energy saving rate is up to 15-45%.

Alumina fibers have lower thermal conductivity, heat shrinkage and heat capacity. The long-term use temperature is 1300 ~ 1400 ° C, higher than ordinary aluminum silicate fiber (1000 ~ 1100 ° C). It has good chemical stability and can be used in acidic environment, oxidizing atmosphere, reducing atmosphere and vacuum. It also has certain corrosion resistance to alkaline environment, but it is easily eroded by lead vapor and vanadium pentoxide. This kind of fiber is mainly used as a heat insulation furnace for various heat treatment furnaces, ceramic firing kiln, pyrolysis furnace and combustion furnace in the steel industry, and the energy saving effect is remarkable. For batch operation, the furnace can also increase the output of the product to a large extent. In addition, it can be used as a catalyst carrier in the chemical industry, called an alumina carrier. Insulation materials for nuclear reactors and space shuttles, light alloy reinforcements, etc.

Industrial high-temperature furnace field Energy-saving effect is remarkable Alumina short fiber has outstanding high-temperature resistance, and is mainly used as a heat-insulating refractory material, and is used as a heat-insulating material for a body lining in a metallurgical furnace, a ceramic sintering furnace or other high-temperature furnace. Because of its low density. The heat insulation is good and the heat capacity is small, which not only can reduce the quality of the furnace body, but also can improve the temperature control precision, and the energy saving effect is remarkable. The energy-saving effect of alumina fiber in high-temperature furnace is better than that of ordinary refractory brick or high-temperature coating. The energy saving is far greater than the heat loss. The reason is not only because the heat loss is reduced, but also the furnace gas is strengthened. Convective heat transfer, so that the furnace wall can get more heat, and then passed to the material through the national emblem, thereby increasing the heating rate and production capacity of the material.

Environmental protection and recycling applications have bright spots

Alumina fibers are used in environmental protection and recycling technologies due to their good chemical resistance. For example, the equipment for incinerating electronic waste has been used for many years. The alumina fiber still shows its excellent corrosion resistance against various harmful substances in the furnace. It can be used as a ceramic integral lining on automobile exhaust equipment, which is characterized by stable structure. Saffil alumina fiber can be used for aluminum alloy plugging. Its advantage is that it expands less when the temperature rises, about 25% less than pure alloy, which makes the piston and cylinder match well and saves fuel.

Reinforced composites

Since the alumina fiber and the metal matrix have good wettability and small interfacial reaction, the mechanical properties, wear resistance and hardness of the composite material are improved, and the thermal expansion coefficient is lowered. Alumina fiber reinforced metal matrix composites have found application in automotive piston groove components and rotary gas compressor blades. Moreover, since the alumina fiber is well bonded to the resin matrix, the elasticity of the glass fiber is larger than that of the carbon fiber, and the compressive strength of the carbon fiber is higher, the alumina resin composite material is gradually replacing the glass fiber and the carbon fiber in some fields. Especially in the field of stationery, it can be made into high-strength fishing rods of various colors, golf balls, snowboards, tennis rackets, etc.

Alumina long fiber reinforced metal matrix composites are mainly used in high-load mechanical parts and high-temperature high-speed rotating parts and high-performance components with light weight requirements, such as automotive connecting rods, transmission rods, brake pads and other parts and helicopter transmissions. Device, etc. Recently, researchers have begun to use it in the lining of thermonuclear reactor cooling heat exchangers.

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