The physical Nature of the Refractory Brick

Structural properties

Macroscopic organization structure of fire clay brick is heterogeneous body composed of solid material and gas hole. Porosity is the important factors influencing the products under normal

temperature and high temperature performance, especially under the condition of high temperature, is products to the outside world of erosion resistance ability is greatly reduced. Reason of gas

hole formation: when products molding, the air in the material is completely ruled out. After material moisture ruled out, leaving space. Raw material calcined is inadequate, some should

decomposition of salt is the complete decomposition, should be burning ingredients to burn completely. The material composition is uneven, when high temperature firing, contraction is uneven,

etc.





1. porosity

The porosity of refractory can be divided into: closed porosity, closed in the products is not connected with the outside world. Open pores, closed at one end and the other end connected with the

outside world, for fluid filling. Cut-through pore, The two sides of the cut-through products, get through for the fluid.

2. Bibulous rate

Bibulous rate is absorbed by all the open pores in the products of water quality and the quality of the dry sample ratio. Because the bibulous rate of determination method is simple, in actual

production often used for identifying the quality of raw material calcined. The raw material calcined is the better, the bibulous rate value is the lower.

3. Bulk density

The definition of bulk density is the ratio of dry weight and total volume of products, also known as a volumetric weight. Volume density intuitively reflects the degree of the density of the products, it

is an important measure indicator of  dense refractory products quality. But in the production of  lightweight insulation products, in order to reduce the heat capacity and thermal conductivity, people

use various means to reduce the products volume density.