Low Creep High Alumina Brick

Low Creep High Alumina Brick Definition

Low creep high alumina brick is made of high quality high alumina bauxite clinker as the main refractory raw material, the three stone raw refractory material for improving creep resistance is added, and the mud material is configured to be formed by high pressure molding and high temperature firing.

Why Choose Low Creep High Alumina Brick Application in Hot Blast Stove

1.Because the heat storage capacity of low creep high aluminum bricks is higher than that of clay bricks and silica bricks, hot blast stoves generally use low-creep, high aluminum perforated bricks and other types of refractory bricks with high heat storage capacity. It is compact and reduces the floor space. This is particularly advantageous for retrofitting hot air stoves because it avoids the need to increase the heat storage capacity of the hot blast stove to make the structure of the hot blast stove large, while avoiding the limitations of existing sites.

2.With the development of modern smelting technology, hot blast stoves generally adopt high air temperature technology, 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. Which 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 material, thus causing widespread concern for low creep bricks for hot blast stoves.

3.M45 mullite brick is used as the main raw refractory material, and M45 is a low alumina mullite bricks composite. The main crystalline phase is mullite. Due to its low gas rate (generally 2%), the structure is very dense and Fe2O3. TiO2 has low impurity content, good high temperature volume stability and erosion resistance, in order to further improve the thermal shock stability and creep resistance of the material, M5 mullite fine powder is added to the matrix, three stone raw materials are reasonably selected. The refractory soil is used as a binder to enhance the matrix properties and promote the formation of the crystal phase to improve the microstructure.

Low Creep High Alumina Brick Performance

1. More higher purity, more better the creep resistance, more impurities, worse the creep resistance of the high alumina refractory low creep.

2. Higher the crystal phase/glass ratio, better the creep resistance, and vice versa.

3.The finer the grain of the crystal phase, the more grain boundaries, the finer the particles, and the worse the creep resistance.

4.As shown in Fig. 4, the higher the temperature at which the glass phase is formed, the higher the viscosity, and the better the creep resistance.

5.The crystal phase is needle-like, rod-shaped, columnar network cross, the better the creep resistance of refractory brick

6. No reaction or dissolution between the crystalline phase and the glass phase, generally better creep resistance.

7. The reducing atmosphere is worse than the oxidizing atmosphere, or the creeping rate is faster, and the creep resistance is higher for low creep high alumina fire bricks.