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Banyak bata refraktori bertemu 1100 darjah, batu bata tanah liat yang murah, bata alumina tinggi yang baik, batu bata mullite, bata silika bata magnesium, bata elektrofusi yang mahal, dan lain-lain., the choice of refractory brick temperature is only an indicator, but also according to the working conditions, environment, operating characteristics, dan lain-lain. to choose.
According to the definition of refractory refractoriness greater than 1580 degrees inorganic non-metallic materials and products. Refractoriness refers to the temperature at which the material reaches a specific degree of softening under the action of high temperature, which marks the performance of the material to resist the action of high temperature. Refractory bricks need to withstand very high temperatures, and people also need them to work properly even at high temperatures.
Oleh itu, in the unit volume weight, the density is high, so that can indicate that the denseness of the refractory brick is good, and the strength it brings may be high. Refractory bricks also have higher requirements for their porosity of them.
Namun begitu, today people need to do specific requirements in the process of industrial production, but a manufacturer must strictly control the apparent porosity has a very high quality.
On the other hand, the thermal shock resistance of this material is very good, it is resistant to rapid changes in temperature without being destroyed.
Oleh itu, it can be concluded that refractory bricks have unit volume weight, high density, good denseness, kekuatan tinggi, and other characteristics.
1. Silica-aluminum refractory bricks. It is known that it is based on the basic theory of the AL2O3/SiO2 binary system phase diagram, terutamanya termasuk yang berikut.
2. Batu bata silika. Silica brick refers to the refractory brick containing SiO293% or more, which is the main variety of acid refractory brick. Ia digunakan terutamanya untuk ketuhar kok batu, tetapi juga digunakan dalam pelbagai kaca, seramik, kalsin karbon, refractory bricks for the vault of the hot work kiln, and other load-bearing parts, in the hot air furnace of high-temperature load-bearing parts also used, but should not be used in the hot work equipment below 600 ℃ and temperature fluctuations.
3. Batu bata tanah liat. Clay bricks are mainly composed of mullite (25% kepada 50%), fasa kaca (25% kepada 60%), dan kuarza persegi dan kuarza (sehingga 30%).
Biasanya, hard clay is used as raw material, pre-calcined to mature material, then with soft clay, shaped by semi-dry or plastic method, and fired at 1300-1400 C to make clay brick products. Can also add a small amount of water glass, simen, and other binding agents made of non-fired products and indefinite materials.
It is commonly used refractory bricks in blast furnaces, relau udara panas, relau pemanasan, dandang kuasa, tanur kapur, tanur berputar, tanur kaca, seramik, dan tanur api bata tahan api.
4. Bata alumina tinggi. The mineral composition of high alumina bricks is corundum, mullite, dan fasa kaca. Its content depends on the AL2O3 / SiO2 ratio and the type and number of impurities, the grade of refractory bricks can be classified according to the AL2O3 content.
The raw materials are natural ores of high alumina bauxite and silica line type, also mixed with electrofused corundum, alumina tersinter, synthetic mullite, and clinker calcined with alumina and clay in different proportions. It is mostly produced by the sintering method.
But the products also have fused cast bricks, bata berbutir bercantum, bata yang tidak dibakar, dan bata tahan api yang tidak berbentuk. High alumina bricks are widely used in the steel industry, industri logam bukan ferus, dan industri lain.
5. Bata tahan api korundum, corundum brick refers to AL2O3 content of not less than 90%, corundum as the main phase of a refractory brick, can be divided into sintered corundum brick and electrofusion corundum brick.
The porosity in the refractory brick includes open and closed porosity. Porosity generally refers to the volume of the visible pores within the atmosphere and the percentage of the total volume of the product, also called visible porosity. The smaller the porosity of the product, the better the thermal conductivity and the higher the compressive strength, but the resistance to rapid cold and heat is poor.
Bulk density is the number of mass per cubic meter of brick including all the porosity, while the volume of the brick sample includes only the rock part when calculating the true density. Since the true density of different crystalline quartz is not the same, Oleh itu, the true density of the brick can understand its firing situation. The true density is smaller for better-fired silica bricks.
Products at room temperature unit area can withstand large pressure, called room temperature compressive strength. The structure is uniform and dense, and the products with good firing have high room temperature compressive strength.
Usually expressed by the average linear expansion rate in a certain temperature range.
Refers to the performance of refractory bricks to transfer heat. It is expressed in terms of thermal conductivity, and its unit. Keliangan rendah, dense structure of the brick, and thermal conductivity are good. The crystalline structure has better thermal conductivity than the glassy one. Most refractory bricks such as silica bricks and clay bricks thermal conductivity, with the increase in temperature, but there are a few refractory bricks (such as magnesium bricks and silicon carbide) with thermal conductivity, but with the temperature increases and decreases.
Fire resistance indicates that the refractory bricks at high temperatures tosist softening (melting) performance, which refers to the temperature when the top of the refractory cone specimen bent down and touch the side of the chassis.
Indicates the ability of the refractory brick to resist temperature under a certain load. Load softening temperature is the specimen under 0.2MPa pressure, heated at a certain rate of heating, as the temperature increases, the specimen continues to produce deformation, hen the large height of the specimen is reduced by 0.6% of the temperature, that is, the load softening temperature. It is related to the chemical properties of refractory bricks, crystalline structure characteristics, the viscosity of the glass phase at a certain temperature, the relative ratio of the crystalline phase to the glass phase, firing temperature, and particle size composition.
Firebrick and refractory bricks in long-term use at high temperatures, the volume of irreversible changes in performance, usually residual expansion (or shrinkage) to indicate the volume stability of refractory bricks. Its specific indicators are refractory bricks at a certain temperature, heating at a certain time, after natural cooling, measuring its volume change, and the value of the percentage of the original volume, known as residual expansion (or residual shrinkage).
Refractory brick resistance to rapid changes in temperature without damage. The test method is to put half of the specimen in the heating furnace, the other half outside the furnace, heated to 850C when holding 40 minutes, and then put into the flow of cooling water tank in the rapid cooling, so repeatedly, when the damage off part of the mass of the original specimen for 20% of the mass of the rapid cooling and rapid heating times. It is closely related to the size of the expansion coefficient of the product, the unevenness of the internal temperature distribution of the product, and the shape and size of the product.
Refractory brick at high temperatures to resist the chemical and physical effects of slag, furnace decomposition products performance. The main factors affecting the resistance to erosion are the chemical composition of the product and slag, working temperature, the nature of the decomposition products of the furnace charge, and the density of the product.
According to the definition of refractory materials, refractory bricks are shaped refractory materials, ordinary refractory products can meet the high-temperature requirements of 1100, if the refractory clay bricks can meet the requirements of use do not use high alumina bricks.
If you want to solve the problem completely, you need to dig from the root cause and analyze the real reason. per refractory is engaged in the production of refractory materials, research, and development services for many years, can solve all kinds of difficult problems of high-temperature furnace lining, welcome new and old friends to consult and technical exchanges.
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