Wear Resistant Layer Of Centrifugal Fan Impeller Special Treatment Centrifugal Fan Accessories Backward Inclined Impeller Wheel

Wear Resistant Layer Of A Centrifugal Fan Impeller Special Treatment Centrifugal Fan Accessories Backward Inclined Impeller Wheel

The wear - resistant layer of a centrifugal fan impeller is a protective coating or structural layer attached to the impeller surface through specific processes. It aims to enhance the impeller's ability to resist wear caused by the scouring, friction of solid particles, and chemical corrosion, prolong the impeller's service life, and ensure the stable operation of the fan. The selection of materials and processes depends on factors such as dust characteristics, gas composition, temperature, and pressure in the usage environment. The common types and applicable scenarios are as follows:

- Surfacing wear - resistant layer: Welding processes such as shielded metal arc welding and submerged arc welding are used to clad wear - resistant materials like high - chromium alloy and tungsten carbide on the impeller surface. The hardness of this wear - resistant layer can reach over HRC60, with excellent resistance to abrasive wear. It is suitable for high - concentration dust environments such as mine crushing and cement grinding. For example, in the raw material grinding fan of a cement plant, facing the scouring of a large amount of high - hardness limestone and clay dust, the surfacing wear - resistant layer can effectively resist wear and extend the impeller's life. However, the surfacing process is prone to generating thermal stress, requiring high - level welding techniques, and the impeller's dynamic balance needs to be recalibrated after repair.
- Sprayed wear - resistant layer: Technologies such as plasma spraying and high - velocity oxygen fuel spraying are used to spray powder materials like ceramics (e.g., alumina, silicon carbide) and cermets (e.g., nickel - chromium chromium carbide) onto the impeller surface at high speed to form a dense coating. The sprayed wear - resistant layer is thin (usually 0.1 - 1mm) and has high bonding strength, with both wear - resistance and high - temperature resistance. It is commonly used for the impellers of power plant boiler induced - draft fans. When these fans are operating, the impellers need to withstand the scouring of fly - ash particles in high - temperature flue gas at 150 - 300°C. The sprayed ceramic wear - resistant layer can maintain good wear - resistance and chemical stability in high - temperature environments without significantly increasing the impeller's weight and affecting the dynamic balance.
- Adhesive wear - resistant layer: Wear - resistant patches made of polymer composite materials (such as ultra - high - molecular - weight polyethylene and polyurethane rubber) are attached to the impeller surface with high - strength adhesives. This wear - resistant layer has good flexibility and is easy to install, and can absorb the impact energy of particles. It is suitable for medium - concentration dust environments with certain impacts, such as the ventilation and dust - removal fans in the grain processing industry, which can effectively resist the wear of grain particles on the impeller. In addition, in environments with corrosive gases, such as the fans for chemical waste gas treatment, pasting corrosion - resistant and wear - resistant rubber patches can resist both chemical corrosion and particle wear.
- Cast wear - resistant layer: During the impeller casting process, wear - resistant materials (such as high - chromium cast - iron inserts) are pre - placed in the easily - worn parts, so that the wear - resistant materials and the impeller body are integrally formed. This wear - resistant layer is firmly combined with the impeller and is suitable for large - scale, heavy - duty centrifugal fans, such as the main sintering exhaust fans in the metallurgical industry. When working, they need to transport a large amount of high - temperature dust - containing flue gas. The cast wear - resistant layer can ensure the long - term stable operation of the impeller under harsh working conditions and reduce the frequency of shutdown for maintenance."

Which type of wear - resistant layer do you think is the most cost - effective?

Key Features 

• Product as drawing.
• Customized
• Diameter :400-3500mm. 
• Material:Carton steel Q345, Staliness steel, Aluminium.Cast iron, bronze, stainless steel, manganese bronze, Monel, INCONEL, and non-metallic materials.Non-metallic material composition: PPS plastic, phenolic resin and so on
• Special Treatment: Wear-resisting processing, Surfacing welding processing.