For fused cast AZS block, what is the reason for the expansion? Now let’s take a look at the reasons for the expansion of fused cast AZS blocks.
1. The expansion of fused cast AZS blocks depends not only on the composition of the raw materials, but also on the firing temperature and porosity. When used in a humid environment, repeated heating and cooling will lead to increased expansion, and fused cast AZS blocks expand with the temperature of the water. increases and the duration of action is prolonged.
2. The diameter of water molecules is about 0.2um, but the particle clusters that form fused cast AZS block materials are about 1000 times larger than water molecules, or even larger. Due to the thermal movement of fused cast AZS blocks, water molecules can easily penetrate into the material and cause the formation of fine cracks. After the steam or water molecules diffused along the microcrack wall reach a narrower position, the pressure acting on the sidewall of the crack increases to more than 100MPa, causing the crack to expand.
3. Water vapor is adsorbed on the capillary wall of fused cast AZS block; the material forms hydrate or slug solution; some materials form a zeolite-like structure; the glass phase in the material is hydrated; clay minerals and their decomposition products adsorb moisture, etc., all may be The reason for the expansion.
The fused cast zirconium corundum AZS series products produced by Topower Refractories are mainly made of industrial alumina, zirconia and desiliconized zirconium as raw materials. finished product.
Topower refractory produce the fused cast AZS blocks has the same co-crystals as AZS33# fused zirconium corundum bricks, 36# AZS bricks have more chain-shaped zirconia crystals and lower glass phase content, so the corrosion resistance of 36# fused zirconium corundum bricks The property is further enhanced, so it is suitable for areas with fast glass flow or high temperature.
