Abstract:
Ceramic fiber is a fibrous lightweight refractory materials, mainly for the aluminium silicate, chemical composition according to its mineral components can be divided into the glass fiber and modal fiber two kinds of crystal. Glass fiber is normal by molten material flow in cooling liquid in the form of a solid fiber, Many fibers used more colloid injection method (or dumped into fine silk), high temperature firing.
Ceramic fibers are widely used in all kinds of thermal insulation of kiln, high temperature resistant materials because of its density than other refractories, greatly small, heat insulation and heat obvious effect, as the lining materials to reduce the energy loss, furnaces in energy saving for thermal furnace brought about a revolution. On the other hand it to the application technology and method of thermal furnace lining also brought about a revolution.
1.the current use
Ceramic fibers first appeared in 1941, the cloth, Nashville cox company with natural kaolin, eaf melting with blowing into fibers. In the late 1940's, the two companies producing aluminium ailicate fibre, and the first series of applied in aviation industry, In the 1960s, American developed various ceramic fiber products, and used in industrial furnace.thermal. In the 1970s, ceramic fiber in our country begins production, its application technology used in the 1980s, rapid temperature range, mainly used in 1000 ° c, application technology are relatively simple backward. Since 1990s, with containing zirconium and polycrystalline alumina fibers, use the popularization and application of the temperature to 1000 ° ~ 140 degrees, but due to the product quality defects and the application of the technology behind, application field and application are limited. If polycrystalline alumina fibers in fiber mat, not a single, specifications, cotton fiber dispersion, although use block temperature increase, but the intensity is very poor, limits the scope of use, shorten service life.
Containing zirconium fiber with melting method is a versatile production, low cost of aluminium ailicate fibre, as the hot life.for various furnaces, face the fibers liner in this aspect of the domestic product quality and application development is relatively backward, now foreign appeared chromium-contained fiber, the temperature is higher than containing zirconium fiber, domestic haven't this report.
2 kinds and purpose
Ceramic fiber breed basically has: normal aluminium ailicate fibre, high aluminium aluminium ailicate fibre, aluminium ailicate fibre Cr2O3 (ZrO2, polycrystalline alumina fibers, and polycrystalline mullite fibrous etc. In recent years, the foreign has successfully developed (or was) some new ceramic fiber varieties, such as magnesium olivine fiber, ceramic fiber (SiO2 - CaO MgO - and Al2O3 - CaO), etc. Ceramic fiber, cotton blanket, carpet, modules, paper, cloth, belt, rope, etc.
Ceramic fiber mat (fiber module) : using the melting, even the melting process even jilt long fiber, spun into the double needle that fiber woven into, can directly as a flame, integrating refractory, thermal insulation, at an organic whole, in neutral, oxidation and reduction of long-term use slant XingQi points, still can maintain good strength and toughness. Using the fiber of carpet fiber module contains no binder, good thermal stability, widely used in petrochemical, metallurgical, power resistance insulation.
Ceramics by ceramic fiber board: binder, additives, and after pulping, molding, curing, drying process. Ceramic beaverboard flexility and easy cutting, high strength, low thermal conductivity is a kind of new regenerator, low heat energy-saving and environmental protection products, which are widely used in all kinds of heating equipment, the wall of backing etc, heavy refractory materials.
Ceramic fiber cloth, belt: mainly used in fire doors, industrial furnace thermal insulation, heat insulation pipe and container.
Ceramic fiber rope: mainly used in various industrial kilns expansion joints, the winding insulation, heat pipe heat insulation joint steel structure.
Ceramic fiber paper: by ceramic fiber and binder, additives, after pulping, molding, curing drying process, is the ideal sealing, insulation material. Can be used in all kinds of thermal expansion joints, high-temperature pad kiln areas such as insulation.
In addition, ceramic fiber can also be used for filtering and catalyst carrier material, dense material and friction materials, insulation paint, strengthen material, etc.
3 malpractice and prospects
Although for high temperature ceramic fiber industrial fields of insulating refractory plays an important role, but also a lot of production, especially its disadvantages have inhalable, on the environment and human, has certain harm to the foreign enterprises to strengthen amorphous ceramic fiber restrictions. At present, a kind of biological solubility amorphous ceramic fiber in adiabatic refractories market, the super fiber (SiO2 - CaO - MgO department of ceramic fiber) non-pollution environment-friendly materials. Ceramic fiber products production, is the future trend toward more pollution, fine and functional direction, especially using new craft, new material, preparation of high-tech and high added value of fine ceramic fiber and its functional likely to produce more adiabatic refractories, zhejiang optimization is of great significance.
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