Low Cement Silicon Carbide Refractory Castable

Low cement SiC refractory castables are characterized by low linear expansion coefficient, high thermal conductivity, high strength, and good wear resistance. They have been used in thermal equipment such as power generation boilers, non-ferrous metallurgical furnace,s and incinerators, and the use effect is good. Rongsheng Refractory Castable Manufacturer is a powerful manufacturer of refractory materials. Contact Rongsheng to purchase high-quality SiC refractory castables, low cement refractory castables, and refractory castables for metallurgical industrial furnaces.

Low-cement SiC refractory castables use silicon carbide with SiC greater than 97% as refractory aggregate and powder, add SiO2 ultrafine powder and metal silicon antioxidant, use CA-70 cement as binder and add polyphosphate water reducer. The main properties of this material are SiC of 85%, 110℃ drying volume density, pressure resistance and flexural strength are 2.5g/cm3, 45MPa and 9MPa respectively. After burning at 1000℃, the linear change, pressure resistance and flexural strength are -0.2%, 107MPa and 24MPa respectively. After burning at 1450℃, the linear change, pressure resistance and flexural strength are +0.3%, 130MPa and 54MPa respectively. The thermal conductivity at 400℃ is 12.2W/(m·K).

Low cement silicon carbide refractory castable is a special refractory material. It is suitable for thermal equipment such as power generation boilers, non-ferrous metallurgical furnaces and incinerators. The castable has the following characteristics:

• - Low linear expansion coefficient: Silicon carbide, as the main refractory aggregate and powder, has a low linear expansion coefficient, which can reduce the possibility of thermal stress.

• - High thermal conductivity: Silicon carbide has good thermal conductivity, can effectively conduct heat and improve the thermal efficiency of equipment.

• - High strength: Low cement ratio and the use of reasonable binders can improve the strength of the castable and increase its compression and flexural resistance.

• - Good wear resistance: Due to the use of silicon carbide with SiC greater than 97% as refractory aggregate, the castable has excellent wear resistance.

The formulation of low-cement silicon carbide refractory castables includes the following ingredients:

• - Refractory aggregate and powder: mainly silicon carbide with SiC greater than 97%, which has excellent refractory properties.

• - Ultrafine powder: Adding SiO2 ultrafine powder can improve the density and refractoriness of the castable.

• - Binder: Using CA-70 cement as a binder can ensure that the castable has a certain strength and durability.

• - Antioxidant: Metal silicon antioxidant is used to prevent oxidation of silicon carbide.

The performance test results of the castable at different temperatures are as follows:

• - After drying at 110℃, the bulk density is 2.5g/cm³, the compressive strength is 45MPa, and the flexural strength is 9MPa.

• - After firing at 1000℃, the linear change is -0.2%, the compressive strength is 107MPa, and the flexural strength is 24MPa.

• - After firing at 1450℃, the linear change is +0.3%, the compressive strength is 130MPa, and the flexural strength is 54MPa.

• - The thermal conductivity at 400℃ is 12.2W/(m·K).

In summary, low cement silicon carbide refractory castable has low linear expansion coefficient, high thermal conductivity, high strength and good wear resistance. Through reasonable proportioning and the use of appropriate materials, the refractory performance and thermal efficiency of the equipment can be improved. The castable has a good application effect on thermal equipment such as power generation boilers, non-ferrous metallurgical furnaces and incinerators.