Corundum Mullite Brick
Corundum Mullite Brick is a specialty high-alumina refractory material formulated to contain a controlled microstructure of both crystalline Corundum (Al₂O₃) and Mullite (3Al₂O₃·2SiO₂). By combining these two stable phases, the brick achieves an optimized balance of properties:
- Corundum: Extreme refractoriness and chemical inertness
- Mullite: Superior thermal shock resistance and creep resistance
This makes it a premium solution for severe service applications in steel, glass, and chemical industries where operating conditions involve both high thermal cycling and aggressive chemical attack.
Main Function and Characteristics
The primary function is to provide a Balanced, Ultra-Stable Lining. Mullite stabilizes the structure against thermal stress, while Corundum provides resistance against corrosion and wear.
| Characteristic | Value Range | Primary Refractory Function |
|---|---|---|
| Material Base | Corundum (Al₂O₃) & Mullite (3Al₂O₃·2SiO₂) | Synergy of high refractoriness and thermal shock immunity |
| Alumina Content | 75% to 90% | Higher Al₂O₃ than standard Mullite for greater refractoriness |
| Thermal Shock Resistance | VERY HIGH | Derived from Mullite’s low thermal expansion |
Classification
- Material Focus: Specialty High-Alumina Brick
- Primary Application Focus: Corundum-Mullite Composite → Glass Tank Crowns, Hot Blast Stove Domes, Cement Kiln Transition Zones
Key Performance Metrics
- Slag Resistance: HIGH — High Al₂O₃ content resists acidic/neutral slags and metal penetration
- Creep Resistance: EXCELLENT — Mullite’s crystal structure maintains strength under load at peak temperatures
- Volume Stability: SUPERIOR — Negligible change during prolonged service, preventing structural failure
Corundum Mullite Brick
1. The Rationale for the Composite Structure
- Pure Corundum: Extremely refractory but sensitive to thermal shock
- Pure Mullite: Excellent thermal shock resistance but slightly lower maximum service temperature
Optimized Synergy: Corundum Mullite bricks combine both advantages. Corundum acts as the high-refractory skeleton, while Mullite provides elasticity and thermal fatigue resistance.
Manufacturing: Produced by blending synthetic Mullite and sintered Corundum powders or using raw materials that convert to the two-phase microstructure during high-temperature sintering (>1700°C). Ratios are engineered for specific applications.
2. Performance in High-Stress Zones
Ideal for transitional zones where conditions change rapidly:
- Glass Furnace Superstructure: Resists alkali fumes and thermal cycling
- Blast Furnace Stoves: Handles heavy load and alkali attack while maintaining RUL at high preheat temperatures
- Cement Kiln Transition Zone: Withstands high temperature and chemical reactions with kiln dust and clinker
3. Applications
- Glass Industry: Crowns, breast walls, burner ports of float and container glass furnaces
- Iron and Steel: High-performance zones in hot blast stoves and electric furnace roofs
- Chemical Processing: Linings for incinerators, calciners, and reactors requiring high chemical purity
- High-Temperature Kilns: Firing zones and supports for advanced ceramics and technical powders
✨ Customization Services
We offer product customization services, allowing you to tailor the appearance, dimensions, or specific markings of items like refractory shapes or bricks. This includes options for incorporating specific geometric requirements to ensure seamless integration into your process systems.
🔬 Sampling for Testing & Validation
Free product samples are available for thorough testing and validation. This allows you to confirm the quality, compatibility, and performance of our materials—such as specific bricks, castables, or raw materials—before committing to a full order.
💡 Expertise in Refractory Solutions
Leverage our deep expertise to receive detailed, application-specific refractory solutions. We move beyond just selling products by providing comprehensive plans that encompass material selection, installation guidance, and performance optimization to maximize the lifespan and efficiency of your high-temperature processes.
Rabatec products are exclusively manufactured in facilities that have achieved rigorous ISO certifications across Quality (ISO 9001), Environmental Management, and Occupational Health & Safety. This commitment ensures every product, from refractory bricks to specialized equipment, meets the highest global benchmarks for performance, sustainability, and workplace safety.
📦 Logistics Excellence: Shipping, Packaging, and Marking
Minimizing Risk: We manage all logistics to minimize handling touchpoints and transit shock. Our carriers are pre-vetted for their experience in transporting heavy, fragile, and sensitive industrial materials.
Traceability: Every shipment includes comprehensive documentation and tracking information, providing end-to-end visibility and ensuring precise delivery coordination for your site.
Protection is Paramount: Our packaging strictly follows industry standards to prevent damage, corner chipping, and moisture absorption—especially critical for materials like Basic Refractory Bricks and Refractory Mortars & Mixes.
Robust Palletization: Products are secured on fumigated, high-strength export pallets (e.g., 1100x950mm or similar sturdy dimensions) using heavy-duty strapping and durable protective wrapping (polyethylene sheeting, cardboard, etc.) to withstand long-distance travel and multiple loadings.
Moisture Control: Sensitive materials are protected with appropriate sealing and, where necessary, desiccants or moisture-vapor proof enclosures to maintain the product's integrity until installation.
Clear Identification: All outer packaging is clearly marked on multiple sides with large, legible text for immediate identification and safe handling.
Full Traceability: Markings include all essential data points: Product Name, Quality Grade, Batch Number, Quantity, Net/Gross Weight, Order Number, and the Final Destination/Construction Area. This ensures every pallet can be accounted for and correctly staged upon arrival.
Safety & Compliance: We adhere to all regulatory requirements for marking, labeling, and placarding—especially for any items classified as Dangerous Goods—to ensure full compliance with international and domestic transport regulations.
❓ Frequently Asked Questions (FAQ)
Question | Elaborated Answer |
Q: What is the Refractoriness Under Load (RUL) of your refractories? | A: Refractoriness Under Load (RUL) is a critical property that defines the maximum temperature our materials can withstand while under compressive stress before deforming (softening). Since we offer a wide range of materials—from Alumina-Silicate Bricks to high-performance Silicon Carbide Bricks—the RUL varies significantly. For specific product data, please refer to the product data sheet or submit a quote request for the material you are interested in. |
Q: Where are the Rabatec refractories and materials produced? | A: Our products are primarily sourced from specialized manufacturing plants in China. Crucially, these facilities have all undergone rigorous audits and achieved comprehensive ISO certifications (Quality, Environment, and Safety), ensuring that production adheres to the highest global standards for consistency and performance. |
Q: What refractory materials does the company offer? | A: We supply a comprehensive portfolio of advanced refractory solutions, including: Shaped Products: Alumina & Silica Bricks, Basic & Specialized Bricks (e.g., Magnesia), SiC & Structural Ceramics, and Precast Shapes. Monolithic Products: Refractory Castables, Mixes & Mortars. Insulation: Insulation Fibre and High-Performance Insulation Products. |
Q: How should I choose the appropriate refractory material for my application? | A: Selecting the correct refractory is paramount to process efficiency. The choice depends on three key factors: 1. Operating Environment: Maximum process temperature and thermal cycling (shock). 2. Chemical Attack: Type of slag, molten metal, or corrosive gas being handled (acidic, neutral, or basic). 3. Mechanical Stress: Abrasion, erosion, and static load requirements. We recommend utilizing our detailed refractory solutions service to consult with our engineers for an optimized, application-specific recommendation. |
Q: Which monolithic material should I choose when patching an existing lining? | A: For patching and minor repairs, the ideal monolithic material depends on the parent lining material, the patching depth, and the need for a rapid return to service. Common choices include: Refractory Mortars & Mixes (for minor joints/surfaces) or Plastic Refractories (for areas requiring physical compaction). Always choose a patch material chemically compatible with the existing lining to ensure proper bonding and service life. |
Q: Can I receive product samples before placing a major order? | A: Yes. We gladly provide product samples for your internal testing and validation purposes. This ensures you can confirm the quality, composition, and fit of the material—such as our Refractory Castables or Alumina-Silicate Bricks—in your specific operational environment before committing to a bulk purchase. |
Q: Do you provide certifications to verify material quality? | A: Absolutely. We provide product-related inspection certificates and quality assurance documentation upon request. This verifies that your order has passed all internal quality control checks and meets the required material specifications and industry standards. |
Q: What measures are taken for product protection during transport? | A: We ensure quick, reliable transport by using robust, industrial packaging that strictly follows industry standards. This includes high-strength palletization, heavy-duty strapping, and weather-resistant wrapping to protect fragile items like bricks and mixes from corner chipping, mechanical damage, and moisture during transit. |
