Chrome Zirconia Corundum Brick
Main Chemical Compositions & Categories
This brick is a complex, high-performance ceramic that combines three critical components: CORUNDUM (Al2O3), ZIRCONIA (ZrO2), and CHROMIUM OXIDE (Cr2O3). It is typically a fusion-cast or high-sintered product.
| COMPONENT | CONTENT | KEY FUNCTION | PRIMARY ADVANTAGE |
| Al2O3 (Corundum) | 40% to 70% | High Refractoriness / Hot Strength | Structural stability at extreme T |
| ZrO2 (Zirconia) | 10% to 30% | Volume Stability / Corrosion | Enhances viscosity of corrosive melt |
| Cr2O3 (Chrome) | 5% to 20% | Slag Resistance | Inhibits chemical dissolution by slag |
Key Properties and Performance
| PROPERTY | TYPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
| Corrosion Resistance | MAXIMUM | Combination of Cr2O3 and ZrO2 provides broad-spectrum resistance to both acidic and basic melts. |
| Glass/Slag Contamination | MINIMAL | Low porosity and the ZrO2 phase slow the dissolution rate, leading to very low melt contamination. |
| Thermal Shock Resistance | VERY GOOD | Improved by the micro-cracking mechanism of ZrO2, which absorbs thermal stress. |
| High Temperature Creep | EXTREMELY LOW | Dense Al2O3 and ZrO2 matrix offers maximum resistance to long-term deformation. |
Advantages and Key Characteristics
Chrome Zirconia Corundum (CZC) bricks are specified for the most aggressive, critical hot spots in large furnaces, offering an unparalleled blend of chemical resistance, thermal resilience, and structural integrity.6
- Broad-Spectrum Corrosion Control: ZrO2 is extremely stable and forms a highly viscous interface with molten glass/silicate melts. The addition of Cr2O3 further enhances resistance to Fe-rich, CaO-rich (basic) melts that attack pure Al2O3-ZrO2.
- Low Exudation: The dense composition and low SiO2 content minimize the formation of liquid phases that can exude (weep) from the brick, maintaining high structural purity.
- Volume Stability: The inclusion of ZrO2 provides enhanced resistance to thermal spalling and dimensional change, ensuring tight joints throughout the campaign.
Typical Industries and Applications
This brick is reserved for environments where campaign life and product purity are paramount and failure is extremely costly:
- Glass Industry: Bottom and sidewall hot spots, high-pull areas, boost electrodes, and vulnerable sections of the melter.
- Specialty Metals/Chemicals: Furnaces and vessels processing highly corrosive, complex slags or high-purity melts.
- High-Temperature Incinerators: Linings exposed to highly variable and aggressive ash/slag chemistries.
Furnace Areas and Service Zones
They are used in zones demanding the highest chemical and thermal stability:
- GLASS MELTER PAVEMENT/BOTTOM: Where the brick is subject to “upward drilling” and constant chemical dissolution.7
- BOOST ELECTRODE BLOCKS: Areas where electrical current generates extremely high, localized temperatures and chemical activity.
- FEEDER CHANNEL CONTACT ZONES: Where the melt is refined and contamination must be absolutely minimized.
Key Data Sheet Properties to Consider
Selection is based on the composite performance metrics:
- ZrO2 Content: CRITICAL VALUE. Confirms the level of corrosion and thermal shock resistance.
- Cr2O3 Content: Indicates the level of protection against basic or complex slags.
- Fusion-Cast vs. Sintered: Fusion-cast versions offer the lowest porosity (near 0%) and maximum corrosion resistance, while sintered versions offer better thermal shock resistance at a lower cost.
- Bulk Density (BD) and Apparent Porosity (AP): Must be maximized (BD) and minimized (AP) for resistance to infiltration.
Technical Guidance: CZC bricks are the highest-performing oxide refractory for corrosion resistance, often used in conjunction with other AZS/AZC grades. Due to the high cost and complexity, they are typically limited to the most vulnerable “hot spots” of a furnace. As with all chrome-containing refractories, specific disposal protocols are required to handle potential Cr(VI) waste.
✨ 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. |
