Silicon Carbide Refractory Castable

Silicon carbide refractory castables are formulated with high-purity silicon carbide as the primary raw material and offer excellent wear resistance, erosion resistance, and thermal conductivity. They are particularly suitable for critical areas of industrial furnaces exposed to severe wear, erosion, and corrosion.

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Description

Silicon carbide refractory castables are primarily composed of silicon carbide, combined with aluminosilicate materials, silicon carbide particles, and ultrafine powders, and bonded with high-purity calcium aluminate cement.Their most prominent characteristic is excellent wear resistance, along with strong corrosion resistance. The key to their performance lies in the addition of a specific proportion of silicon carbide to conventional refractory castable formulations, forming a composite refractory material.

Due to the outstanding hardness and wear resistance of silicon carbide, its incorporation significantly improves the wear resistance of the castable, reduces the wear coefficient, and can extend service life by 1–2 times.
Silicon carbide also features high thermal conductivity and a low coefficient of thermal expansion. When added in appropriate proportions, it enhances the thermal shock resistance of the castable. In particular, silicon nitride–bonded silicon carbide products exhibit thermal shock resistance approximately twice that of castables without silicon carbide. In addition, it helps prevent slag adhesion and surface scaling.

Silicon carbide refractory castables maintain high strength and excellent wear resistance at elevated temperatures while exhibiting good chemical stability. They resist corrosion from both acidic and alkaline media.
Moreover, silicon carbide has a large wetting angle with molten metal and slag, providing strong resistance to corrosion from solid, liquid, and gaseous media in various furnace linings. These castables therefore offer excellent wear resistance, erosion resistance, spalling resistance, corrosion resistance, and anti-scaling properties.

Project		Silicon Carbide Castable
Al₂O₃+SiC(%) ≥		60
Operating Temperature (℃)		1400
Bulk Density (g/cm³)	110℃×24h ≥	2.5
Compressive Strength(MPa)	110℃×24h ≥	80
Compressive Strength(MPa)	1100℃×3h ≥	10
Flexural Strength (MPa)	110℃×24h ≥	10
Flexural Strength (MPa)	1100℃×3h ≥	12
Linear Rate of Change (%)	1100℃×3h	±0.4

product-520-520

Silicon carbide refractory castables are particularly suitable for critical areas of industrial furnaces and kilns exposed to long-term material wear, high-velocity gas erosion, and complex chemical environments, due to their high hardness, excellent wear resistance, and strong resistance to erosion and corrosion.

Cement Industry

In cement production systems, high material flow rates and heavy dust concentrations cause severe wear on furnace lining materials. Compared with conventional wear-resistant refractory castables, silicon carbide castables can significantly extend the service life of heavily worn areas.

●Cyclone linings: withstand continuous scouring from high-velocity rotating materials and gas flow.

●Feed pipes and chutes: effectively resist mechanical wear from clinker and raw meal particles.

●Preheater system wear zones: reduce localized erosion and frequent maintenance caused by material abrasion.

Power Industry

In power plant boiler systems, the excellent wear and erosion resistance of silicon carbide castables helps reduce the risk of unexpected boiler shutdowns.

●Return feeders: withstand high-temperature material backflow and continuous particle scouring.

●Air chambers, ash hoppers, and discharge pipes: resist fly ash erosion and particle abrasion.

●CFB boiler wear-resistant zones: maintain structural stability under high flow velocity and severe wear conditions.

Metallurgical Industry

Metallurgical furnaces and kilns often operate under high temperatures, heavy loads, and severe erosion conditions. Materials with high hardness and dense structures are essential for ensuring long-term stable operation.

●Hig-temperature troughs and chute linings

●Wear-resistant areas in sintering and calcination systems

●Heat treatment furnace components exposed to material impact

Non-ferrous metal smelting industry

In the smelting of non-ferrous metals such as aluminum and copper, furnace linings must not only resist wear but also provide resistance to chemical corrosion. The excellent chemical stability of silicon carbide castables helps reduce structural damage caused by media penetration and erosion.

●Smelting furnace inlets and outlets

●High-temperature material channels and guiding structures

●Areas prone to slag attack and particle erosion

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