HVOF

HVOF Spraying Service

Overview:

The working principle is that the liquid that enters the combustion chamber from the small hole is burned, such as kerosene, which is ignited after being atomized and mixed with oxygen, and a strong gas phase reaction occurs. The heat energy released by the combustion causes the product to expand violently. When the expanding gas flows through the Laval nozzle, it is affected by the nozzle. The constraint of the formation of supersonic high temperature flame flow. The flame heating accelerates the sprayed material to the surface of the substrate, forming a high-quality coating.

Features of supersonic flame spraying：

1. The flame velocity is high but the temperature is relatively low, suitable for spraying carbide-containing materials.

2. The coating is dense and the surface roughness is low.

3. The bonding strength is slightly lower than that of explosive spraying, reaching more than 70MPa.

4. The spraying efficiency is high, but the fuel consumption is large, and the spraying cost is relatively high. 

5. Loud noise (>120dB), sound insulation, and protective devices are required.

Commonly used materials for supersonic flame spraying：

1 The flame velocity is high but the temperature is relatively low, suitable for spraying carbide-containing materials.

2 The coating is dense and the surface roughness is low.

3 The bonding strength is slightly lower than that of explosive spraying, reaching more than 70MPa.

4 The spraying efficiency is high, but the fuel consumption is large, and the spraying cost is relatively high. 

5 Loud noise (>120dB), sound insulation, and protective devices are required.

Common materials for supersonic flame spraying：

WC-12Co

WC-10Co-4Cr

WC-10Ni

CrC-NiCr

Nickel-based self-fluxing alloy

Cobalt-based self-fluxing alloy