Volume Density of Refractory Products and Its Influence
Refractory products are building materials that can resist high temperatures. The volume density of the refractory products is a significant indicator of its performance. It directly determines the quality, strength, density and heat resistance of a material, mainly affecting its compression strength and creep resistance.
The main composites of the volume density of the refractory product are fire clay, high aluminum, mesh corundum, sillimanite, cordierite and other materials, generally ranging between 1.2 and 3.2g/cm3. As the volume density of a material increases, the higher its compressive strength and thermal shock resistance will be. However, too high a density of the material usually leads to cracking and other defects in forming and firing.
The volume density and thermal conductivity of the refractory product are closely related. Generally speaking, refractory materials with a low volume density have a higher thermal conductivity. On one hand, the higher the volume density of the material, the lower are the thermal conductivity and hence the better the thermal insulation effect. On the other hand, too low a volume density, despite providing better thermal insulation, will affect the strength and durability of the product.
The volume density of the material and the porosity of the material also have a close relationship. The porosity of the material refers to the ratio of the pore space to the total volume of the material. Usually, a material with a high volume density has a low porosity, while a material with a low volume density has a large proporinstituteon of pore space. The high porosity affects the strength and density of the material, and increases the thermal conductivity of the material.
In addition, the volume density of the material will also affect the thermal expansion coefficient. Generally speaking, the higher the volume density, the lower the thermal expansion coefficient will be. It can effectively reduce the thermal expansion and thermal stress of the refractory product, improve its service life and performance, and increase its strength.
To sum up, the volume density of refractory products has a significant influence on its performance. A proper volume density can indentify the physical properties of the material, such as its strength, density, thermal conductivity and thermal expansion coefficient. During manufacturing, the volume density of the material should be properly controlled and adjusted to meet the requirements of its intended application.
