The mechanical property of high alumina refractory fire brick refers to the mechanical property index of the product under various conditions such as strength, which represents the ability of the product to resist various stresses and deformation caused by external forces without being destroyed.
Whether at room temperature or under service conditions, high alumina brick will be deformed and even destroyed due to various external forces such as compression force, tensile force, bending force, shear force, friction force or impact force. Therefore, to test the mechanical properties of high alumina brick under different temperature conditions, it is necessary to understand its resistance to damage and explore its damage mechanism. It is very important to seek ways and methods to improve product quality.
Compressive strength refers to the ultimate load that high alumina refractory fire brick can withstand per unit area at a certain temperature without damage. The compressive strength of high alumina brick is divided into normal temperature compressive strength and high temperature compressive strength. It is one of the important performance indexes to measure the quality of high alumina brick. It briefly reflects the structure of the product, such as density, uniformity and sintering property. The normal temperature compressive strength of high alumina refractory fire brick has a great impact on the production, transportation and service performance of the product, and in most cases, also directly affects the service life, so we hope that the product can achieve a high compressive strength value.
The high temperature compressive strength of high aluminum brick refers to the limit load that high alumina refractory fire brick can withstand without being destroyed on the unit area of three-dimensional sample of specified size under the specified high temperature condition. The high temperature compressive strength of high alumina brick determines the range of use of the product, which is one of the important basis for the selection of high alumina brick. For non-fired refractory products and unshaped high aluminum bricks, due to the addition of a certain number of bonding agents or admixtures in the material, the normal temperature bonding mode and strength will change with the rise of temperature, so its high temperature compressive strength has a more important significance.
The compressive strength measured at room temperature is the material's compressive strength at room temperature. The sample is heated to the specified temperature at the specified rate, and the compressive strength measured after holding for a certain time is the high temperature compressive strength under the temperature. As we all know, high alumina refractory fire bricks are divided into three grades according to the aluminum Al2O3 content. At normal temperature, the compressive strength of first grade high aluminum bricks is 55MPa, the compressive strength of second grade high aluminum bricks is 50MPa, and the compressive strength of third grade high aluminum bricks is 45MPa, 1MPa is equivalent to 10 kilograms.
