What is the fire resistance limit of refractory bricks?
The main indicators of refractory bricks are: refractoriness, softening under load, etc.
1. Refractoriness is also called refractory and melting resistance. This performance index characterizes the high temperature tolerance of the object without melting. Refractoriness is not a physical constant, but a technical indicator. Its content depends on chemical composition, degree of dispersion, liquid phase ratio and liquid phase viscosity. The test method for refractoriness is to make the test material into a truncated cone of a specified size. When heated at a certain heating rate, it will gradually bend due to weight. The temperature at which the test cone is bent down to the top and in contact with the chassis is the refractoriness of the test material.
2. Load softening temperature: refers to the temperature at which refractory bricks deform when heated under a constant pressure load and at a certain heating rate, indicating the resistance of refractory materials to high temperature and load at the same time.
It refers to the temperature at which refractory products deform under a constant pressure load under specified temperature rise conditions. It indicates the resistance of the product to the simultaneous action of high temperature and high load, and to a certain extent indicates the structural strength of the product under the same conditions of use, and also indicates that the product has obvious plastic deformation under this condition. Temperature, which is an important quality indicator of performance.
Refractory bricks can be used for a long time in a high temperature environment, and it is not suitable to be judged by the fire resistance limit.