Tungsten Carbide Spraying and Processing

Category:

Mechanical Equipment Repair Services

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Product Description

Tungsten carbide spraying

Description:

Our company provides repair services for worn blade surfaces of fan impellers in cement plants, power plants, wastewater treatment plants, and other facilities, as well as surface enhancement coatings for new impeller blades. These services can extend the service life of impellers by several times. We employ a supersonic thermal spraying tungsten carbide repair solution, which produces a dense coating with high hardness and excellent wear resistance, thereby significantly prolonging the service life of the components.

The High-Velocity Oxygen-Fuel (HVOF) thermal spray process is employed specifically to apply wear- and corrosion-resistant coatings to impeller and blade surfaces. This process can be used either for the pre-protection of new components or for the refurbishment of existing ones. The coating hardness can reach above HRC70, with a typical thickness ranging from 0.15 to 0.20 mm. The coating exhibits a uniform and consistent appearance, free of porosity, and boasts high bonding strength. Moreover, the spraying process allows for precise temperature control, ensuring that the workpiece remains completely free from any deformation. This technology is particularly suitable for applications involving particle erosion in power plant fan impellers, pump impellers, blades, and other similar components.

Tungsten carbide powder coating:

Tungsten carbide (WC) is the primary raw material used in the manufacture of cemented carbides and boasts exceptionally high microhardness. Commonly used WC-based coatings include powders with 8% Co, 12% Co, and 17% Co content. The addition of cobalt in varying proportions to WC primarily serves as a binder, enhancing the toughness of the coating and preventing carbon burn-off during the spraying process. Chromium carbide (Cr2C3), on the other hand, exhibits high hardness and excellent resistance to high-temperature oxidation and wear, with a maximum service temperature reaching up to 800°C. Typically, Cr2C3 is used in combination with Ni-Cr alloys and is mainly applied in high-temperature wear-resistant areas.

Wear-Resistant Tungsten Carbide Repair Coating Process for Mechanical Components—Tungsten Carbide Wear-Resistant Coating Parameters:
Processing procedure: → Sandblasting → Preheating → Primer coating → Tungsten carbide spraying (thickness: 0.04–1.0 mm) → Polishing;
Processing method: Plasma/Supersonic Flame Spraying Tungsten Carbide Coating
Performance indicator: Hardness can reach: HRC70~80
Bonding strength: ≥90 MPa
High temperature resistance: Above 1200℃
Coating thickness: 0.04 mm ~ 1.0 mm
Service life: Longer than traditional methods
The processing range has been increased by a factor of 3 to 6: diameter—from several tens of millimeters to several hundred millimeters.
Length: Can be processed from a few millimeters to several meters.