The methods to improve the toughness of refractory castables

Nov 13,2017
The refractory castable has structural defects, inherent pores and cracks. Under the action of external force, the crack is easy to start and has no energy dissipation mechanism, which is prone to brittle fracture. The toughening approach can control the microstructure and reduce the crack Size, control the number and distribution of impurities and stomata. It is also possible to prevent crack propagation by adding energy dissipating mechanisms and setting obstacles. Phase change toughening, micro-crack toughening, etc. can produce energy-consuming institutions. The second phase particles, cracks can be extended to meet the obstacles, the occurrence of crack deflection toughening. These measures can hinder the further expansion of the crack, improve the toughness of the material, so as to improve the thermal shock resistance of the refractory castable.
Castable refractory material is currently the most widely used production and use of an amorphous refractory material. Mainly used to build a variety of furnace lining, such as the overall structure. Some good varieties can also be used for smelting furnaces. Such as aluminate cement refractory castable can be widely used in a variety of furnaces and other non-slag, acid-base erosion of thermal equipment. In hot metal, molten steel and molten slag erosion and the higher working temperature of the site, such as tapping groove, ladle and blast furnace shaft, iron trenches, etc., can be used by the combination of low calcium and pure high alumina cement from Containing high alumina and good sintering of good quality granular and powder refractory castable made of material. Another example is the phosphate refractory castable can be widely used in heating furnace and heating the metal soaking furnace can also be used for coke ovens, cement kilns in direct contact with the material site. Some sites in metallurgical furnaces and other vessels that are in direct contact with the molten slag and the molten metal also have a good effect of repairing with high-quality phosphate refractory castables. In some parts of the work temperature is not high and the need for higher wear resistance, the use of phosphate refractory castable is more appropriate. If the choice of corundum refractory castable refractory materials, the use of reducing atmosphere generally have better results. Huan Yang Industrial Co., Ltd. to provide you with high-quality refractory materials.

Methods to improve the toughness of refractory castables

When used as a liner and furnace for thermal equipment, baking should generally be carried out prior to the first use to gradually remove the physical and crystalline water therein to some degree of sintering to make its volume and certain properties Reach the stable condition when using. Baking system has a great impact on the service life. The basic principle of baking system should be the rate of temperature rise and dehydration may occur and other phase changes and deformation corresponding to sharp changes in some of the temperature during these stages, should be slowly warming or even a long time insulation. If the baking is improper or rapid heating without baking immediately put into use, can easily produce serious cracks, or even collapsed, in the extra-thick parts may even explode.

In China, the application of monolithic refractories to cement firing systems has been around for a long time, but the use of refractory materials in the firing systems of new dry-process cement production lines is still a matter of the last few years. Although many domestic cement kilns use amorphous refractory, many cement companies are still struggling to find suitable amorphous refractory materials and their suppliers. The quality of amorphous refractory materials and related services remains one of the problems that plague cement producers, while at the same time many cement producers still lack a sufficient understanding of amorphous refractory materials. Carefully analyze and solve the existing problems, there is no doubt that the need for amorphous refractory suppliers and cement manufacturers work together.