High-Performance Alumina Ceramic Impeller – Wear And Corrosion Resistant Solution For Extreme Working Conditions

Alumina ceramic impeller is a precision rotating component manufactured using high-purity alumina (Al₂O₃ content ≥95%-99%) as the core material. It is created by compositing an alumina ceramic layer onto a metal substrate surface or by precision machining entirely from ceramic material, perfectly combining the "ultra-hard" characteristics of alumina ceramics with the structural design of an impeller. This product is primarily used in scenarios such as induced draft fans and coal mills in thermal power plants, circulating fans in cement plants, blast furnace fans in steel mills, and pumps conveying corrosive slurries in the chemical industry. It is the ideal choice for addressing high-wear and strong-corrosion working conditions.

• Extreme Wear Resistance, Long Service Life: The hardness of the alumina ceramic layer can reach HRA86 or above, and up to HRA94 with localized toughening. Its wear resistance is more than 5 times that of high chromium cast iron and over 100 times that of ordinary 16Mn steel. Under typical conditions, a 1.5mm thick ceramic layer wears less than 0.2mm on average over 5 years, ensuring long-term equipment operation for 8-10 years.
• Safe and Reliable, Anti-Shedding Design: Utilizing high-performance adhesives combined with composite techniques like cold welding and inlaying, the shear strength reaches up to 35MPa (at room temperature). Coupled with safety factor calculations (typically over 100 times the centrifugal force), it guarantees that the ceramic layer will not shed under high-speed rotation and high-temperature conditions.
• Temperature and Corrosion Resistant, Strong Adaptability: By selecting different composite technologies (polymer, cold welding, metal welding), the product is suitable for normal temperatures (≤120°C), medium temperatures (120-180°C), and high temperatures (180-380°C). It exhibits excellent chemical stability, resisting acids (except hydrofluoric acid) and alkalis.
• Lightweight and Energy-Saving, Optimized Efficiency: The density of alumina ceramic is approximately 3.6-3.9 g/cm³, only half that of steel. The weight reduction of the impeller decreases the moment of inertia, improving fan operating efficiency by 10%-30% and extending the service life of components like bearings.
• Easy Maintenance, Rapid Repair: For impellers manufactured using composite technology, if localized ceramic shedding occurs on-site, specialized wear-resistant adhesive can be used for quick cold repair without dismantling the impeller, without affecting the dynamic balance, significantly reducing downtime.

The production of alumina ceramic impellers mainly adopts the "metal substrate + bonded ceramic" composite manufacturing technology to ensure product performance and reliability:

1. Substrate Preparation: Design and manufacture the metal impeller substrate according to fan parameters, then perform sandblasting, degreasing, and roughening on the areas requiring ceramic bonding.
2. Material Selection & Compositing: Select matching high-strength, tough adhesives (e.g., polymer adhesive, cold welding material) or welding processes based on the working condition temperature.
3. Vacuum Bonding: Use vacuum bonding technology to tightly arrange and bond alumina ceramic tiles (typically 10×10mm or larger) on severely worn areas such as the blade working face, outlet, and backplate.
4. Curing Treatment: Perform room temperature or heat curing according to the adhesive's characteristics to achieve optimal bonding strength.
5. Non-Destructive Testing: Use non-destructive testing techniques to check for bubbles or debonding in the composite layer, ensuring bonding quality.

• Installation: Verify that the impeller model matches the fan parameters before installation. Strictly avoid striking the ceramic surface during installation. The fit between the impeller and the shaft must adhere strictly to tolerances to prevent stress concentration.
• Operation: Check the fan's dynamic balance before initial startup. Avoid prolonged fan operation in the resonance zone during operation. Strictly control the medium temperature not to exceed the product's temperature rating.
• Inspection: Regularly monitor fan vibration levels and operating sounds. If abnormal vibration is detected, shut down the equipment to inspect for ceramic tile damage caused by foreign object impact.

• Warranty Commitment: Provides a warranty period of 12 months from the start of operation or as specified in the contract. Within the warranty period, failures caused by manufacturing quality or abnormal ceramic shedding will be repaired or replaced free of charge.
• On-Site Repair: If localized abnormal wear or shedding of ceramic tiles occurs during operation, technical personnel can be dispatched to perform rapid on-site cold repair using specialized wear-resistant adhesive (e.g., KN17) to restore equipment performance.
• Technical Consultation: Offers 7x24 hour technical consultation services to assist customers with issues related to selection, installation, and operation.