Surface Treatment Methods for Cemented Carbide Balls

Cemented carbide balls surface treatment can be achieved through a variety of processes, including hard chrome plating, hard alloy overlay welding, plasma nitriding, supersonic spraying, chemical conversion coating, vapor deposition, laser surface modification, and fine grinding and polishing. Different methods focus on improving hardness, wear resistance, corrosion resistance, process complexity, and applicable scenarios. The following are some common surface treatment methods for cemented carbide balls:

1. Hard Chrome Plating: Plating a layer of hard chrome on the surface of the ball significantly improves its hardness and wear resistance. This method is simple and relatively low-cost, but the coating may lose hardness at high temperatures due to the release of internal stress. The coating also has weak bonding strength and is prone to peeling.

2. Hard Carbide Overlay: Hard alloy overlay welding can improve the hardness and wear resistance of the ball surface. However, this method is prone to part deformation, is complex, and inefficient, so it is currently rarely used for surface hardening of spheres.

3. Plasma nitriding: Plasma nitriding forms a nitride layer on the sphere surface, improving surface hardness and wear resistance. However, the nitride layer has poor corrosion resistance and is unsuitable for use in highly corrosive applications such as coal chemical processing.

4. Supersonic spraying: Supersonic coatings offer high bonding strength and are suitable for processing sphere surfaces in conditions such as highly corrosive and high-viscosity fluids, and mixed fluids containing dust and solid particles.

5. Chemical conversion coating technology: This method uses chemical or electrochemical methods to form a stable compound film on the metal surface, such as phosphating and oxidation treatments. This method is primarily used for corrosion protection and surface decoration of workpieces, but can also be used to improve wear resistance.

6. Vapor deposition technology: This includes physical vapor deposition (PVD) and chemical vapor deposition (CVD), which can deposit a high-hardness, wear-resistant film on the surface of cemented carbide spheres. For example, applying a TiC coating using CVD can significantly improve tool wear resistance and cutting performance.

7. Laser Surface Modification: Laser surface treatment of cemented carbide surfaces is performed using laser technology, such as laser cladding, laser alloying, and laser surface texturing. These techniques can improve the wear resistance, corrosion resistance, and high-temperature resistance of cemented carbide.

8. Fine Grinding and Polishing: Fine grinding smoothes the surface of the ball, improving surface finish and precision, and contributing to improved accuracy and reliability. This method is particularly suitable for cemented carbide balls requiring high surface quality.

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