What is the pressure weight that high alumina bricks can withstand?
The compressive strength of high alumina bricks is a physical index, but in actual production and use, the compressive strength is an easily achieved index. The most difficult index to achieve is the Refractoriness Under Load(RUL).
So how much pressure can the high-alumina brick with easy-to-reach compressive strength be able to withstand?
This depends on the different levels and quality of high alumina bricks. Because high-alumina bricks are formed by high-pressure forming and high-temperature firing, they have high fatigue resistance. Different quality levels can withstand different pressures.
The compressive strength of the first grade high alumina brick is about 60Mpa, this index is very easy to achieve, because of the raw materials and a series of measures and firing temperature in the manufacturing process of the high alumina brick. If it is a super-specific high-alumina brick, because it cannot be press-formed, the compressive strength will be relatively low by about 5MPa.
The compressive strength of secondary high alumina bricks is about 55MPa, and the strength of handmade bricks and super-specific bricks is between 45-50MPa. The compressive strength of three-level high alumina bricks is about 50MPa, and the strength of handmade bricks and special-shaped bricks is about 40MPa.
Of course, if it is an anti-stripping high alumina brick, the strength will be greater than 70Mpa due to the addition of zirconium, and the strength of a brick with an aluminum content of 80% will also be greater than 65MPa.
Bricks with higher strength can withstand external impact, friction, and compression more. That is to say, the higher the strength, the longer the service life. Therefore, the greater the pressure.
The compressive strength is the ultimate load that can be withstood on the three-dimensional sample area of the specified size at a certain high temperature without being destroyed. The compressive strength determines the bearing capacity of refractory bricks. Therefore, the higher the strength, the greater the pressure.
So in practical applications, how to define the bearing pressure of high alumina bricks? Under normal circumstances, the compressive strength of 1MPa can withstand a pressure equivalent to 10 kilograms, that is, 10 times the compressive strength is the pressure weight that can be withstood.