Alumina fiber applications

[China Aluminum Network] Alumina fiber thermal conductivity, heat shrinkage and heat capacity are lower. Long-term use temperature is 1300 ~ 1400 °C, higher than ordinary aluminum silicate fibers (1000 ~ 1100 °C). It has good chemical stability and can be used in acidic environment, oxidizing atmosphere, reducing atmosphere and vacuum conditions. It also has certain corrosion resistance to alkaline environment, but it is vulnerable to lead vapor and vanadium pentoxide. This fiber is mainly used as a heat-insulating lining for various heat-treating furnaces, ceramic firing kilns, cracking furnaces, and combustion furnaces in the iron and steel industry, and the energy-saving effect is remarkable. Kilns for batch operations can also increase product output significantly. In addition, it can be used as a catalyst carrier in the chemical industry, called alumina carrier. Nuclear reactors and space shuttle thermal insulation materials, light alloy reinforcements, etc.

Industrial energy saving effect in the field of high temperature furnaces Alumina short fiber has outstanding high temperature performance, mainly used as adiabatic refractory material, in the metallurgical furnace, ceramic sintering furnace or other high temperature furnace in the body lining insulation material. Because of its low density. The good heat insulation and small heat capacity not only can reduce the quality of the furnace, but also can improve the accuracy of temperature control, and the energy-saving effect is remarkable. Alumina fiber in the use of high-temperature energy-saving furnace energy-saving effect than the average refractory brick or high-temperature paint is better than the amount of energy loss heat loss, not only because of reduced heat loss, but more important is to strengthen the furnace gas on the furnace wall Convective heat transfer, so that the furnace wall can get more heat, and then passed through the national emblem to the material, thereby increasing the material heating speed and production capacity.

Environmental protection and recycling applications with bright spots Alumina fibers can be used in environmental protection and recycling technologies due to their good chemical resistance. For example, the equipment for incineration of electronic waste, after many years of operation, alumina fiber still shows its excellent resistance to corrosion of various harmful substances in the furnace, and can be used as a ceramic monolithic lining for automobile exhaust gas equipment. Its characteristic is that the structure is stable. Saffil alumina fibers can be used for aluminum alloy stoppers, which have the advantage of less expansion when the temperature rises, about 25% less than pure alloys, so that the piston and cylinder are in good agreement and can save fuel.

The performance advantages of reinforced composites are obvious because the wettability of alumina fibers and metal matrix is good and the interfacial reaction is small. The mechanical properties, wear resistance and hardness of the composites are all improved, and the thermal expansion coefficient is reduced. Alumina fiber reinforced metal matrix composites have found application in automotive piston groove components and rotary gas compressor blades. Because of the good combination of the alumina fiber and the resin matrix, the elasticity of the alumina fiber is larger than that of the glass fiber, and the compression strength of the carbon fiber is higher than that of the carbon fiber. Therefore, the alumina resin composite material is gradually replacing the glass fiber and the carbon fiber in some fields. In particular, in terms of cultural and sports goods, high-strength fishing rods, golf balls, snowboards, tennis rackets and the like can be made in various colors.

Alumina long fiber reinforced metal matrix composites are mainly used for 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 components and helicopter transmissions. Devices and so on. More recently, researchers have begun to use it for the lining of thermal reactor cooling heat exchangers.