Comprehensive interpretation of the mechanical properties of refractory materials

Refractory is the structural material that builds the lining of industrial furnaces. During long-term use, the material is subjected to the dual action of temperature and external force, and various stresses and strains will be generated accordingly. The performance of refractory materials to resist these stresses and strains is called the mechanical properties of refractory materials.

First of all, the mechanical properties of refractory materials refer to the ability of refractory materials to resist deformation and damage under the action of external force. Refractory materials will be deformed or even damaged by various external forces during use and transportation, such as compression force, tensile force, bending force, shear force, friction force or impact force. Therefore, refractory materials under different conditions are tested. Its mechanical properties are of great significance for understanding its ability to resist damage, exploring its damage mechanism, and seeking ways to improve product quality. The mechanical properties of refractory materials include compressive strength, flexural strength, bonding strength, elastic modulus, torsional strength, wear resistance, etc.

Room temperature mechanical strength of refractory

The critical stress of a refractory material under normal temperature to resist external force without breaking. It is usually expressed by three technical indicators: normal temperature compressive strength, normal temperature flexural strength and normal temperature shear strength.

1. Normal temperature compressive strength: the critical compressive stress of the refractory material at room temperature.

2. Flexural strength at room temperature: the critical bending stress of the refractory against the action of bending moment at room temperature.

3. Shear strength at room temperature: the critical shear stress of the refractory against shear force at room temperature. Except for some refractory mud, this indicator is generally not measured.
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The room temperature mechanical strength of refractory materials is measured at room temperature. It does not reflect the mechanical properties of the material at high temperature. However, because the method for measuring the room temperature mechanical strength of refractory materials is simple and economical, this index is often used in engineering to evaluate refractory properties. quality of materials.

High temperature mechanical strength of refractory

The critical stress of the refractory material to resist external force without being damaged at high temperature. It is usually expressed by technical indicators such as high temperature compressive strength, high temperature flexural strength, high temperature shear strength and high temperature distorting strength. The characteristic condition of its experimental determination is constant temperature and variable load.

High temperature compressive strength: the critical compressive stress (unit MPa) of the refractory material at high temperature, its calculation formula is the same as the normal temperature flexural strength.

High-temperature flexural strength: the critical bending stress (unit MPa) of the refractory when resisting the bending moment at high temperature, its calculation formula is the same as the normal temperature flexural strength.

High temperature flexural strength: the critical shear stress (unit Mpa) of the refractory when it resists the shear force at high temperature. Except for some refractory mud, this indicator is generally not measured.

In addition, since the general refractory material is often damaged by shearing when it is twisted, the high temperature torsion test can also be used to measure the high temperature torsion strength when necessary to characterize the ability of the refractory material to resist shearing force at high temperature.