Plastic Refractory

According to the type of refractory aggregate, it can be divided into clay, high alumina, mullite, corundum, chromium, silicon carbide and zirconium-containing refractory plastics. According to the type of binder, it can be divided into refractory plastics combined with aluminum sulfate, phosphoric acid, phosphate, water glass and resin.

The plastic has good thermal shock resistance and is easy to construct. It is suitable for various heating furnaces, soaking furnaces, annealing furnaces, hot blast furnaces, etc. It can also be used for furnace covers of small electric arc furnaces and burners of high-temperature furnaces.

Plastic refractories are made of granular and powdery materials combined with binders such as plastic clay and plasticizers, then add a small amount of water, and are fully mixed to form a kind of hard mud paste that can be maintained for a long time. It's highly malleable unshaped refractory material.

The main components of plastic refractories are granular and powdery materials, accounting for 70% to 85% of the total. It can be made of refractory raw materials of various materials, and is often classified and named according to the material. Since this unshaped refractory material is mainly used in various heating furnaces that are not in direct contact with the melt, clay clinker and high-alumina clinker are generally used, and light granular materials are usually used to prepare lightweight plastics.

Plasticity clay is an important component of plasticity, it only accounts for 10%~25% of the total weight of plasticity, but it is stable to the bonding strength of plasticity and its hardened body, the plasticity of plasticity, and the volume of plasticity and its hardened body Both performance and fire resistance have a great influence. In a certain sense, the nature and amount of clay can be considered to control the plasticity.

Compared with sintered refractory products of the same material and other unshaped refractory materials, plastic refractory materials have better thermal shock resistance, mainly due to the following aspects: plastic refractory materials made of aluminum silicate , during the heating process or when used at high temperatures, there will be no serious deformation due to crystal transformation; the mineral composition near the heating surface is fine crystallization of mullite and cristobalite, with less glass phase, and low temperature along the heating surface Side transition, the structure and phase of the plastic can change gradually rather than abruptly; the plastic can have a uniform porous structure, and the expansion coefficient and elastic modulus are generally low.