Low Creep Fire Clay Bricks
Introduction
Low creep fire clay brick is a kind of High Alumina Refractory Bricks, Low creep fireclay brick is made of high quality raw flint clay material with less impurities, compact structure and high purity. It is added with new refractory raw materials, additives and binders, fireclay brick is formulated by high-temperature sintering after compounding, mixing and high-pressure molding. It has the advantages of small creep rate and strong heat storage capacity.
Therefore, the raw materials for producing low creep clay bricks must be dense in structure, high in purity, and low in impurities, so as to avoid excessive liquid phase in the product during firing to reduce creep resistance and increase heat resistance of low creep clay bricks. Shock and erosion resistance
The development of high thermal shock and low creep fireclay bricks are based on the synthesis of M45 mullite fire brick as the main raw refractory material, and the matrix is added with M75 mullite fine powder. Reasonable selection of three stone raw refractory materials (kyanite, andalusite and silimanite), refractory soil as binder, scientific design components, research and development Under 1100 ° C water-cooling conditions, the thermal shock stability is greater than 55 times (only fine mesh patterns appear), 1350 °C * 0.2 MPa, 20 ~ 50 h creep rate<0.2% about high thermal shock low creep fire clay brick.
Features:
1. Good stability.
2. Low creep rate.
3. Good abrasion resistance.
Low Creep Fireclay Bricks Technical Index
Item / Types | XHJ-SK32 | XHJ-SK34 | XHJ-SK36 | XHJ-SK38 | XHJ-SK40 | |
Chemical Composition | Al2O3(%) | >35 | >38 | >55 | >70 | >82 |
SiO2(%) | ≤60 | ≤50 | ≤35 | ≤28 | ≤10 | |
Fe2O3(%) | ≤2.5 | ≤2.0 | ≤1.8 | ≤1.5 | ≤1.3 | |
Na2O+K2O(%) | ≤1.0 | ≤0.8 | ≤0.8 | ≤0.6 | ≤0.5 | |
Bulk Density | g/cm3 | 2.00 | 2.20 | 2.35 | 2.50 | 2.70 |
Apparent Porosity | % | 22~26 | 20~24 | 20~23 | 20~22 | 18~20 |
Cold Crushing Strength | MPa | 22 | 25 | 45 | 50 | 55 |
Refractoriness | 0.2MPa (℃) | 1350 | 1390 | 1470 | 1550 | 1600 |
Creep Rate | % (1000℃，0.2mpa，25h) | ≤0.6 | ≤0.6 | ≤0.3 | ≤0.2 | ≤0.2 |
Flexural strength | 1200℃ | - | - | - | 10 | - |
1350℃ | - | 6 | 6 | 4 | 4 | |
Low Creep Fireclay Bricks Characteristics
l Good thermal shock resistance.
l Good abrasion resistance.
l Good corrosion resistance.
l Good high temperature mechanical strength.
l Good volume stability, low creep rate.
With the development of modern smelting technology, hot blast stoves generally adopt high air temperature technology, and the service life of hot blast stoves is required to be longer: therefore, higher requirements are put forward for the comprehensive performance of refractory materials for hot blast stoves. Damage to refractory materials used in hot blast stoves is usually caused by thermal stress, chemical attack, and mechanical loading. It is generally believed that an important reason for the damage of the hot blast stove is that the high temperature creep resistance of the refractory material is poor, resulting in collapse, deformation and cracking of the lining refractory material, thus causing widespread concern for low creep bricks for hot blast stoves.