Firstly, it protects the main shaft of the pump from or reduces corrosion and wear.

Secondly, it forms an annular radial sealing surface through close contact with packing gaskets, preventing radial leakage of chemical media.

When the shaft sleeve rotates at high speed with the pump shaft, the areas in close contact with sealing elements (such as PTFE, asbestos, etc.) suffer friction and wear, as well as corrosion from the conveyed chemical media.

Especially when the chemical media contain crystalline particles (e.g., chemical fertilizers), abrasive corrosive wear occurs on the sealing surface.

To resist chemical corrosion, shaft sleeves are usually made of corrosion-resistant stainless steel, corrosion-resistant alloys, Ti alloys, etc.

However, these materials generally have poor wear resistance, especially resistance to abrasive corrosion wear.

This results in scratches or even grooves on the shaft sleeve surface, leading to premature seal failure, leakage, and the need for shutdown, maintenance and replacement.

The shaft sleeve is a relatively simple rotating shaft component.

According to different working conditions and technical requirements, it is easy to select suitable ceramic or KNM1000 cermet coating materials with excellent wear and corrosion resistance for spraying.

Available processes include:

HVOF (High-Velocity Oxygen Fuel) spraying, plasma spraying, detonation spraying, wire arc spraying, and powder flame spraying.

The materials and processes have wide applicability.

Flame spray welding, induction remelting spray welding, and nickel-based self-fluxing alloy coatings can also be adopted.

Using thermal spraying technology, a highly wear-resistant and corrosion-resistant pre-protective coating can be prepared on new shaft sleeves, and worn parts can also be repaired.

Service life can be increased by 3 to 5 times or more.

It is an effective surface strengthening technology for basic mechanical parts.

Therefore, wear-resistant and corrosion-resistant shaft sleeves treated with thermal spraying technology are better suited to the requirements of chemical pumps for conveying media and resisting friction and wear.

This helps enterprises reduce R&D and production costs and improve operational efficiency.