The Nature And Classification Of Refractory Materials

                   First, refractories should have the nature of refractory materials due to the long-term use of various heating conditions of high-temperature equipment, therefore, must have the following main performance: 1. High fire resistance to meet the requirements of high-temperature operation, refractory materials should have a high enough temperature without softening, not melting performance. 2. Good load softening temperature, refractories can withstand the load of the kiln and the stress in the operation process, and at high temperature does not lose the structural strength, do not occur softening deformation and collapse. 3. With high temperature volume stability, refractory materials in the high-temperature conditions, due to the physical and chemical reaction inside the material, the volume will be changed. Requirements of refractory materials at high temperature, the volume of stability, not due to excessive expansion or contraction of the kiln masonry due to the expansion of the product cracked, or because of shrinkage too large cracks, reduce the service life of Masonry. 4. Good thermal shock stability, refractories affected by the operating conditions of the kiln is very large, when the temperature changes rapidly or the masonry body is uneven heating, the brick body will produce stress and make the refractory material cracking, spalling, causing the furnace body damage. Therefore, the refractory material has a certain thermal shock stability. 5. Good corrosion resistance, refractory materials in the use of the process, often by liquid solution, furnace dust, gaseous medium or solid-state chemical action, so that products are eroded damage. Therefore, refractories must have strong resistance to this erosion damage performance.Refractory Materials

                  In addition, refractories have a certain wear resistance, in some special conditions have a certain degree of air permeability, thermal conductivity, conductivity and hardness, etc., at the same time require the shape and size accurate.Refractory Materials

                  Second, the classification of refractory materials, the variety of refractory, complex shape, size, size, performance and many different methods of classification. According to chemical composition can be divided into: acidic, alkaline and neutral refractory. According to the degree of fire resistance can be divided into: ordinary refractory (1 580-1 770 ℃), Advanced refractory (1 770-2000 ℃), Super Refractory (2 000 ℃ above) three categories. According to the processing of manufacturing process can be divided into: firing products, casting products and not burning products. By the use of the Cho to be divided into: cement kiln, glass kiln, blast furnace, open hearth, converter and continuous casting refractories and so on. According to the appearance can be divided into: standard, general type, special-shaped, special type and ultra-high-specific refractory products. According to the molding process can be divided into: natural rock cutting saw, mud pouring, plastic molding, semi-dry molding and vibration, ramming, casting molding and other products. According to mineral composition can be divided into: aluminum silicate (clay brick, high alumina brick, half silica brick), silicon (silica brick, fused quartz products), Magnesia (Magnesia bricks, magnesia-alumina bricks, magnesia-chrome bricks), carbon (carbon bricks, graphite bricks), dolomite, zircon, special refractory products (high-purity oxide products, refractory compounds products and high-temperature composite materials). According to the density can be divided into: heavy quality, lightweight refractories.Refractory Materials