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Fire resistance and development of ceramic fibers

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-08-21     

In recent years, ceramic fiber has been widely used in high temperature firing kilns, which shows high energy saving efficiency.


(1) varieties and properties: the most important indexes of ceramic refractory fibers are fiber diameter and thermal stability.Al2O3SiO2 fiber is commonly used in ceramic industry. According to the high and low content of Al2O3, it can be divided into different use ranges. Cr2O3 material is also introduced to improve its fire resistance and oxidation resistance.Generally, the fiber products with high alumina content and low impurity content such as iron oxide are pure white, and the fiber products with introduced chromium oxide are of the color of milk yellow.The average diameter of ceramic fibers is 24 microns.Fine fiber, low density, low thermal conductivity, high temperature.If the fiber is coarse, density is big when use effect is not ideal.The thermal stability index of fiber is more important.The shrinkage range of al2o3-sio2 fiber products is 3588% at 1260℃.Shrinkage also directly affects thermal stability.


Due to the low thermal conductivity, low density and light weight of fiber, the design and construction of kilns are all supported by light steel frame, which makes the development of ceramic kilns enter the age of light weight.The fiber has little heat storage, suitable for rapid heating and cooling firing.Flexible fiber can be processed into products with grooves or openings, and has good resistance to mechanical vibration and impact, chemical stability is also good, these advantages for the development of new kilns, and affected the development of ceramic technology, the industry has an important role in promoting.At present, ceramic fiber products are: felt, blanket, block, loose fiber, fiber paper and vacuum forming of various products, the working range is generally 8711427℃, under special circumstances can be used in a short period of high temperature above the limit temperature.


(2) masonry methods and precautions: refractory fiber felt, suitable for kiln lining, can greatly improve the energy saving efficiency.Organic adhesives are commonly used to roll fibers into tubular or sheet fabrics.The inner wall of kiln is built with high temperature light firebrick, ceramic fiber refractory felt can be pasted into inner lining.after being burned, the fiber felt or board forms certain rigidity and has satisfactory recovery ability, which can spring back to make the joints tight when cooling.


There are usually two methods of masonry fiber: one is to apply the blanket layer by layer, and then use the bolt to rivet up, generally in the temperature of 1222℃ below the use of metal bolt, 1223℃ above the use of ceramic riveting pieces.One end of the hot side is filled with loose fibers and heat-resistant cement.The use of ceramic riveting pieces can also prevent the deterioration of fibers caused by carbon deposition.The second method is to use prefabricated prefabricated pieces, namely, prefabricated pieces made by stacking felt blankets or accordion prefabricated pieces made by folding felt blankets 305mm wide.Compared with the former, the latter is the same material from the furnace shell to the hot surface, which has higher energy saving efficiency and higher cost.When the temperature rises, the joints formed by laying fiber prefabricated parts need flexible fiber inlaying.Prefabricated components are easy to install, quick to repair, and only the damaged parts need to be replaced.


In terms of thermal efficiency, layer upon layer coating method is obviously superior to prefabricated components.Because the fiber direction of the former is perpendicular to the heat flow, and the fiber direction of the stacked prefabricated assembly is parallel to the heat flow, the difference in thermal conductivity between the two is about 2040%, and the accordion folded prefabricated assembly is in between, and its fiber direction is both parallel and perpendicular to the heat flow.


(3) development prospects: due to the rising energy prices, fuel costs will become the bottleneck to curb the development of ceramics, energy conservation is becoming more and more important.People are more and more concerned about the heat loss of kiln. Some of them attach a layer of refractory ceramic fiber directly to the surface of original refractory lining to improve the thermal efficiency.The obvious cracks or peeling parts on the kiln wall must be repaired before adding.However, heat insulation refractory brick and refractory fiber can not be arbitrarily abused.Up to now if alkalescent blow oxygen to make steel furnace, cement turns the lining such as kiln, because high temperature chemistry is eroded badly, cannot use fiber to make lining temporarily.


For continuous heating equipment such as ceramic tunnel kiln, refractory ceramic fiber has already been used as the lining of continuous heating equipment. According to relevant reports, the energy-saving effect of refractory ceramic fiber used in rapid pushing plate kiln and tunnel kiln is very significant.Especially the ultra-high temperature heating, such as burning temperature in 1538℃1649℃ furnace, using refractory fiber energy saving effect is the best.


At present, all ceramic kiln equipment in Europe, America and Japan are lined with ceramic fiber.Not long ago, Japan decomposed the gas-fired tunnel kilns into compartments for manufacturing, and then shipped them to the construction site of the porcelain factory for assembly. All these are due to the use of ceramic fiber materials, which greatly saves the cost of kilns and is more convenient.The energy saving effect of ceramic fiber products is also being studied from the aspect of material modification.


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