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Impregnated Carbon Bricks High Density and Corrosion Resistant Refractory Material
1. Introduction
Impregnated carbon bricks, also known as pitch-impregnated or resin-impregnated carbon bricks, are high-performance carbon-based refractory materials made from high-purity calcined petroleum coke, graphite, and anthracite, bonded with coal tar pitch or resin, and then vacuum-impregnated and heat-treated. Compared with ordinary carbon bricks, they feature low porosity, high density, excellent impermeability, and superior slag/chemical corrosion resistance.
They are widely used in metallurgy, steelmaking, chemical industry, and high-temperature furnace linings, especially serving as a cost-effective and long-life option for ladle slag lines.
2. Manufacturing Process
- Raw material selection: High-purity carbon materials (fixed carbon ≥90%) with low ash and low impurity.
- Mixing & forming: Mixed with binder, pressed into bricks under high pressure.
- High-temperature firing: Carbonized at 800–1200°C to form a rigid carbon structure.
- Vacuum impregnation: Infiltrated with pitch or phenolic resin under vacuum to seal open pores.
- Curing & finishing: Heat-treated again to stabilize the impregnated agent, resulting in porosity as low as 2–4%.
3. Key Features & Benefits
- Ultra-low porosity & high density: Dense structure resists slag penetration and chemical attack.
- Excellent corrosion resistance: Resists acids, alkalis, and molten slag; ideal for harsh chemical and steelmaking environments.
- High thermal stability & thermal shock resistance: Withstands rapid temperature changes without cracking.
- High mechanical strength: Good abrasion resistance and impact resistance, extending service life.
- Low electrical resistivity: Suitable for electric furnace lining and conductive applications.
4. Main Application Areas
Impregnated carbon bricks are versatile and widely applied in:
- Steel & metallurgy: Ladle lining, refining furnace slag line, converter slag line, electric furnace bottom and wall.
- Chemical industry: Phosphoric acid reactors, storage tanks, pickling tanks, wastewater tanks, and corrosion-resistant linings.
- High-temperature furnaces: Blast furnace hearth, submerged arc furnace, and other high-temperature equipment.
- Non-ferrous metallurgy: Aluminum, copper, and lead-zinc smelting furnace linings.
5. Ideal for Ladle Slag Line
Among all applications, impregnated carbon bricks perform exceptionally well at ladle slag lines.
Ladle slag line is the most severe erosion zone, where bricks face strong molten slag corrosion, thermal cycling, and mechanical abrasion.
Impregnated carbon bricks solve these challenges perfectly:
- Sealed pores prevent slag infiltration.
- High carbon content ensures excellent slag resistance.
- Good thermal shock resistance avoids peeling and cracking.
- Longer service life than conventional magnesia-carbon bricks in some cases.
Conclusion: If you need a reliable, cost-effective refractory for ladle slag line, impregnated carbon bricks are your best choice.
6. Typical Technical Parameters
- Fixed carbon: ≥90%
- Bulk density: ≥1.65 g/cm³
- Compressive strength: ≥65 MPa
- Porosity: ≤4%
- Service temperature: up to 1500°C (reducing atmosphere)
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