HVOF Metal Spray coating

Metal spray coating is a coating technique in which melted material is sprayed on the surface. In HVOF technique a mixture of gaseous or liquid fuel together with oxygen is used as a combustion mixture. Metal spray coatings are usually employed for corrosion resistance and repair and conditioning of damaged parts.

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Detailed Description for HVOF Metal Spray coating

Metal spray coating is a coating technique in which melted material is sprayed on the surface. In HVOF technique a mixture of gaseous or liquid fuel together with oxygen is used as a combustion mixture. Metal spray coatings are usually employed for corrosion protection and conditioning of damaged parts.

 

High Velocity Oxy-Fuel Spray Coating is a thermal spray technique employed to provide a metal spray coating on materials that require a corrosion proof surface.

 

It consists of a combustion chamber into which a mixture of fuel and oxygen is fed. The fuel used can be in gaseous or liquid state. Examples of gaseous fuels are hydrogen, methane, propane, propylene, acetylene, natural gas etc. Examples of liquid fuels are kerosene, gasoline etc. The fuel and oxygen gets ignited and combusted continuously in the combustion chamber. The product of the combustion is a hot gas at pressure approximately equal to 1MPa. The high pressure gas exits from a narrow mouth with a velocity greater than 1000 m/s. A powder feedstock is injected into the gas stream. The powder melts partially through the steam and deposits on the surface to be coated. This results in low porosity and high bond strength.

 

The thickness of the coating can be as much as 12mm. Most common powders used for coating are WC-Co, chromium carbide and alumina. 

 

The system consists of the following:

 

• Spray gun: The device that melts and accelerates the particles to be deposited.

 

• Feeder: It supplies powder to the torch.

 

• Media supply: For generation of flame or plasma to carry the powder on to the material of interest.

 

• Power Supply.

 

 

BENEFITS 

 

• Reduced cost

 

• Improved performance

 

• Improved electrical properties

 

• Enables the components to work in various temperature ranges

 

• Improved life of components 

 

 

USES AND APPLICATION

 

• To deposit wear resistant coating on materials like ceramic and metal layers.

 

• To deposit cermets and other corrosion resistant alloys like stainless steel, nickel alloys, aluminum, hydroxyapatite.

 

• Fouling protection.

 

• Medicinal implants.

 

• Protection from varying temperatures or oxidation.

 

• To alter the thermal conductivity and electrical conductivity of a matter.

 

• Industries like agriculture, construction equipments, food processing, aerospace etc. make use of HVOF coating. 

 

• They are incorporated into design of high tech medical devices.

 

• Used in highly sophisticated electronic devices that requires high performance dielectric properties.

 

 

 

 

 

                                                            

                                                                                                     

                                                                                                   

 

                                                                                                                                            

 

                                                                                                                                                                                


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