The Role of Physical and Chemical Indicators of Corundum Mullite Bricks

Corundum mullite brick is a material with high performance and high refractoriness, which is widely used in metallurgy, chemical industry, construction, and other fields. Its physical and chemical indicators include volume density, porosity, compressive strength, flexural strength, refractoriness, thermal conductivity, etc. These indicators determine the performance and application effect of the material in different applications.

First of all, the bulk density of corundum mullite brick is an important physical and chemical index, usually between 2.2-2.9g/cm³. The lower density indicates that the material has the characteristics of lightweight, lightweight, and large volume, which can reduce the overall load of the building and reduce the self-weight of the structure. In addition, the density directly affects the thermal conductivity and refractory performance of corundum mullite bricks. The lower the density, the smaller the thermal conductivity and the better the refractory performance.

Secondly, the opening rate is another important physical and chemical index of corundum mullite bricks, usually between 10-30%. This value directly determines the porosity and airtightness of the material and has a great influence on its thermal insulation performance and fire resistance performance. The larger the porosity, the higher the porosity of the brick body, the lower the density, the smaller the thermal conductivity, and the better the heat insulation and fire resistance.

Furthermore, compressive strength and flexural strength are important indicators to measure the strength of materials, usually between 40-100MPa. Compressive strength indicates the ability of the material to withstand vertical pressure, and flexural strength indicates the ability of the material to resist lateral load. The larger these two indicators, the better the structural strength and durability of the material, which can withstand greater load and pressure.

In addition, refractoriness is also an important indicator of corundum mullite bricks. This index is usually expressed by the thermal stability and thermal shock resistance of the material, indicating the stability of the material at high temperatures and the ability not to be easily deformed by heat. The refractoriness of corundum mullite bricks is usually above 1650°C, which can withstand high thermal stress and improve the refractory performance of the material.

To sum up, the physical and chemical indicators of corundum mullite bricks have an important influence on the performance and application effect of the material. The interaction between various indicators and comprehensive consideration can get a reasonable material formula and application occasions. In specific applications, the appropriate corundum mullite bricks can be selected according to the needs and process requirements of different occasions to exert their performance and benefits.