Silicon Carbide (SiC) Bricks

Silicon carbide (SiC) bricks are refractory bricks with 70 to 90% SiC, used in blast furnace linings, kiln furniture, waste incinerators and cyclones. They combine high abrasion resistance with high thermal conductivity and good thermal shock resistance. This makes them suitable where a lining must resist wear from moving solids or transfer heat efficiently.

Silicon carbide bricks have a maximum service temperature of 1600°C to 1800°C, depending on SiC content and grade. In service, the practical limit also depends on the furnace atmosphere, because silicon carbide can oxidize slowly in strongly oxidizing conditions at high temperature. Share the operating atmosphere and temperature in your enquiry so the grade can be matched.

Silicon carbide bricks have a thermal conductivity of 8 to 15 W/mK, much higher than clay or alumina bricks, because silicon carbide itself conducts heat well. This is useful in muffles, heat-transfer walls and kiln furniture, where heat must pass through the refractory. It also reduces thermal gradients inside the brick, which helps its thermal shock resistance.

Use Silicon Carbide (SiC) Bricks where abrasion, thermal shock or heat transfer is the main concern, and High Alumina Bricks where an insulating, general-purpose high-temperature lining is needed. SiC bricks have cold crushing strength of 600 to 900 kg/cm² against 400 to 700 kg/cm² for high alumina, and far higher thermal conductivity, which is a drawback where heat must be retained.

Silicon carbide bricks have a cold crushing strength of 600 to 900 kg/cm² and a bulk density of 2.5 to 2.7 g/cm³. The high strength and hardness of silicon carbide are what give these bricks their resistance to abrasion from dust-laden gases, clinker and moving charge, which is why they are used in cyclones and incinerators.

SiC bricks should be laid with a compatible Refractory Mortar and a design that allows for thermal expansion. Because they conduct heat so well, an insulating backup such as Insulating Fire Bricks (IFB) or Ceramic Fiber Blanket & Board is normally needed behind them to control shell temperature. As with other refractory linings, the first heat-up should be controlled.

Silicon carbide bricks are specified by their properties rather than a single catalogue standard: SiC content, density, strength and service temperature, as listed in the technical data table. If your project calls for a particular standard or test data, state it in your enquiry and we will confirm what can be provided for your order.

Silicon carbide refractory bricks are shipped from India under HS code 69022040, refractory bricks and shapes of silicon carbide. This is part of heading 6902 for refractory bricks, blocks and tiles. The destination country applies its own national subheading and duty rate, so have your customs broker confirm the code before the goods arrive.

Yes, standard 230 x 114 x 75 mm SiC bricks and custom shapes for kiln furniture can be shipped together on wooden pallets, shrink-wrapped, in one container. They can also be combined with other refractories and Refractory Mortar in a mixed load. For custom shapes, include drawings and quantities with your enquiry; lead time depends on the shapes and is confirmed with the quotation.