Cementless concrete on ceramic ligaments called Cerambycinae. This term primarily means the use for the production of refractory products of ceramic cement-free binders. The most interesting of ceramic ligaments this so-called highly concentrated ceramic suspension (ECCU). The filler in this case is the same material from which prepared ECCU.
The vast majority of work in this direction is the use of silicon oxide, whether it is a quartzite, quartz sand or fused quartz. Such attention is due to several unique properties of quartz, such as solubility in water forming silicic acid and colloidal solutions, the ability of silica to polymerize. Not a small contribution to these works was made by J. E. Piwinski.
All work relating to the preparation of termoblokov, one way or another are in the preparation of thin ceramic slurry, the solid particles which can form colloidal components and subsequent drying to act as a binder for the larger refractory filler. Or, in the process of preparing a suspension of introduced substances, is able to chemically activate the contact when a solid filler.
Our method of manufacturing a so-called kerambitan is significantly different from traditional methods and allows to obtain non-fired products made of any refractory aggregates, including butoxide, with the exception of materials containing free alkaline earth oxides such as MgO and CaO. Dried at temperatures up to 90onWith the products have high mechanical properties up to 85 MPa, such indicators are not inferior to the best examples of concrete products, made the traditional way with the use of high-alumina cements.
The main advantage of products from ceramic concrete before roasting the product is noeffects of dimensional constraints and dimensional stability during temperature fluctuations, and the absence of the glass phase between the grains of filler, although the latter advantage, in some cases, may be controversial.
Two main advantages of ceramic concrete in front of the refractory products obtained using different types of cements are the lack of failure of the mechanical strength in the temperature range from the start to dehydration and sintering, and also to exclude complex modes of heat treatment, which is necessary to avoid a mechanical destruction of concrete products in the process of removing chemically bound water.
It is no secret that in some cases, the process of heat treatment of monolithic linings is more than 5 days. In addition, it is not always possible to adhere to the same schedule of warm-up of heat and melting units in accordance with the preset conditions.
Another significant advantage of kerambitan products concerned, in fact, their structure. The average size of the open pores is reduced, in comparison with the roast and traditional products concrete products, at least three times, although the total porosity remains practically unchanged. This structure prevents not only melt into the pores, but also the gaseous reactants are able to destroy the lining.
Metallo - and lacoustics kerambitan products in comparison with similar phase and chemical composition of conventional refractory materials are not just better, but more at times. Moreover, given microporous structure of termoblokov, coefficients of thermal conductivity in this type of products with the same apparent density much lower than that of kiln that reduces heat loss through the lining. Application kerambitan products for the manufacture of metallotect, including troughs and filter boxes will also help to reduce heat loss.
Accordingly, with the use of earriiy from termoblokov melting units and metallotect, it is possible to reduce not only the consumption of energy, but also to minimize overheating of the molten metal, which largely determines its quality. No need to explain metallurgists, how harmful overheating of the metal – reduced lining life, and increase in the melt of non-metallic inclusions and increase the amount of oxide films. Therefore, with a rational approach to the manufacture of the lining, in some cases, you can avoid the need for refining of the metal. The use of termoblokov as a modern refractory materials allows joint efforts to optimize the work as melting units, and to improve the quality of the produced products.