Views: 24 Author: Site Editor Publish Time: 2020-04-17 Origin: Site
With the continuous development of some industries in China, people put forward higher requirements for refractory bricks. Therefore, the refractory industry, which has long relied on a wide range of economic growth modes, should intensify its adjustment to meet the needs of the new situation. In the next few years, the prospect of refractory brick industry will continue to expand. At present, brick has a wider range of applications. Only by first understanding it can we better tap its value. So, what is dense brick? How did it perform? In the following article, we briefly introduce this, hoping to help you better understand the dense brick.
The analysis points are as follows:
♦ What is a dense brick
♦ What is the density of dense brick?
♦ Dense brick performance
The dense refractory bricks can be divided into a series of refractories, such as high alumina products, clay products, low alumina clay products, silica products, magnesia chromium products, etc. Refractory bricks have high bulk density, compactness and strength. Therefore, the compactness of refractory bricks is the key condition. In the production process of refractory manufacturer, the volume density index of refractory brick product is a comprehensive reflection of pore volume star and mineral composition. Because it is easy to measure, it is usually used as a means to judge the degree of sintering in production. At present, other common refractory bricks on the market have the following densities: (1) high alumina bricks are generally 2.3-2.7g/cm3; (2) alumina-magnesia-carbon bricks are generally 2.90-3.00g/cm3; (3) silicon bricks are generally 1.80-1.95g/cm3; (4) magnesia bricks are generally 2.85-3.1g/cm3; (5) compact clay bricks are generally 2.1-2.20g/cm3; (6) compact clay bricks are generally 2.1-2.20g/cm3. High density clay bricks are generally 2.80g/cm3. 2.25-2.30g/cm3; (7) Ordinary clay bricks are generally 1.8-2.1g/cm3. Dense bricks are usually pressed or extruded by hydraulic pressure. For small batches, they can be compacted or dumped. It is mainly used now.
Ceramic industry, iron and steel industry, glass industry, aluminum industry and other related industries.
According to the use of different materials, the density of dense refractory bricks is also different. The density of dense refractory bricks can be divided into insulation bricks with volume density greater than or equal to 0.4g/cm3 and light insulation bricks with volume density less than 0.4g/cm3. The compactness of refractory bricks is affected by their thermal conductivity, wear resistance, strength, permeability, bulk density, slag resistance and load softening temperature. The porosity of refractory bricks determines the thermal insulation performance of refractory bricks. Lightweight refractory bricks have high porosity, loose structure and poor slag resistance. Slag penetrates into the pore of brick and breaks it up quickly, so it can not be used to contact slag and liquid metal parts directly. It has low mechanical strength, poor wear resistance and poor thermal stability. It can not be used for load-bearing structures, load contact and wear parts. Dense refractory bricks are heavy refractory bricks with alumina content ranging from 48% to 80%. One of the most important performance of high aluminium refractory products is the structural strength at high temperature, which is usually determined by the load softening deformation temperature. In recent years, the creep properties at high temperature have been measured to reflect the high temperature structural strength.
Density is an important index of dense brick. Density can directly affect product performance, such as porosity, compressive strength, load softening temperature, wear resistance, bending resistance, thermal shock resistance, thermal insulation effect, thermal conductivity and so on. These attributes are all influenced by density.
1. Volume density
The mass per unit apparent volume of refractory products is usually expressed in g/cm 3. High density refractory bricks lead to low porosity, which is an integral part of refractories. It has good and bad effects on the properties of refractories. Porosity, pore size and distribution will affect the product.
2. Thermal conductivity
The density and porosity of refractories are inseparable, which have a great influence on the thermal conductivity of refractories. Generally speaking, in a certain temperature range, the higher the porosity, the lower the thermal conductivity. The chemical mineral composition of refractories also has a significant effect on the thermal conductivity of refractories.
3. Flexural Strength
It includes normal and high temperature bending strength, which refers to the ultimate bending stress per unit cross-section area of refractories under normal and high temperature conditions, respectively. It characterizes the material's ability to resist bending moment at room temperature or high temperature. It is measured by three-point bending method.
Therefore, only through a better understanding of dense bricks, can we develop better. Because dense bricks is also our new product, there are many unknown things. If you have any other information about dense bricks and other related products, please contact us in time. We will provide you with the latest information.