Silicon Carbide ProductsSilicon carbide bricks
Silicon Carbide Brick
Non-oxide silicon carbide brick with high wear and corrosion resistance, high hot strength, high thermal conductivity and low thermal expansion, in six bonding types from SiO₂-bonded to recrystallized.
- Grades / types
- SiO₂, Clay, Si₃N₄, Sialon, Self Bonded, Recrystallized
Product overview
Silicon carbide brick is a non-oxide, high-performance refractory. It combines wear resistance and corrosion resistance with high strength at high temperature, good thermal shock resistance, high thermal conductivity and a low thermal expansion rate.
The specification table lists six bonding types: SiO₂-bonded, clay-bonded, Si₃N₄-bonded, Sialon-bonded, self-bonded and recrystallized.
Key characteristics
- Non-oxide high-performance refractory
- Wear resistance and corrosion resistance
- High strength at high temperature
- Good thermal shock resistance
- High thermal conductivity and low thermal expansion
- Six bonding types
Technical data
| Property | Unit | SiO₂ | Clay | Si₃N₄ | Sialon | Self Bonded | Recrystallized |
|---|---|---|---|---|---|---|---|
| SiC | % | 90 | ≥85 | ≥75 | ≥70 | 94 | ≥99 |
| SiO₂ | % | 10 | 6~10 | — | — | 3.0 | — |
| Si₃N₄ | % | — | — | ≥20 | — | — | — |
| Sialon | % | — | — | — | ≥20 | — | — |
| Bulk Density | g/cm³ | 2.6~2.7 | 2.5~2.6 | 2.6~2.66 | 2.7 | 2.63 | 2.6~2.8 |
| Apparent Porosity | % | 12~15 | 14~20 | 19 | 15 | 16 | 7~20 |
| Cold Crushing Strength (CCS) | MPa | 100~145 | 100~160 | 220 | 228 | 140 | — |
| Cold Modulus of Rupture (CMOR) | MPa | 25 | 20~25 | 45 | 50 | 30~50 | 70~100 |
| Thermal Expansion Rate | ×10⁻⁶/℃ | 4.7 | 4.6 | 4.6 | 5.1 | 5.5 | 4.5~5 |
| Thermal Conductivity (1000℃) | W/(m·K) | 11~14.5 | 11~14 | 15 | 17.4 | 12.8 | 28 |
Where Refractories Are Used
Industry
Steel & Iron
Refractories in iron and steel production are used in the blast furnace, hot blast stove, cast house and coke oven on the ironmaking side, and in the hot metal ladle, converter, electric arc furnace, steel ladle, tundish, RH degasser and reheating furnace on the steelmaking side. Material selection varies by operating zone and includes silica, high alumina, magnesia, magnesia-carbon, alumina-silicon carbide-carbon and silicon carbide products together with castables, ramming mixes and mortars.
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Power & CFB Boilers
Refractories in CFB boilers are used in areas including the boiler combustion chamber, the cyclone separator and refeeder, the economizer, the ignition air flue and cold air chamber, and the tail flue. Material selection varies by operating zone and includes wear-resistant castables, steel-fibre-reinforced castables, wear-resistant plastic refractories, thermal-shock-resistant and fireclay castables, wear-resistant and fireclay bricks, and insulating products.
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Nonferrous Metals
Refractories for nonferrous metals divide into two groups. For aluminium they line the electrolysis cell side wall, corners and bottom, the smelter and the holding furnace, using silicon nitride bonded silicon carbide, carbon-based materials, low cement and non-stick castables and insulation. For copper, zinc, lead and nickel they are magnesia-chrome bricks in directly bonded, semi-rebonded and fused rebonded types.
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Available grades, shapes and sizes
Available grades
- SiO₂
- Clay
- Si₃N₄
- Sialon
- Self Bonded
- Recrystallized
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