Thermal Spray Coating

Thermal spraying is a well established, extremely versatile technology that is commercially used to produce a wide variety of coatings for applications ranging from jet engines and medical implements to pump seals and bicycle rims. Thermal spraying encompasses a group of processes that are capable of rapidly depositing metals, ceramics, plastics, and mixtures of these materials. Thermal spray processes can be grouped into three major categories: plasma-arc spray, flame spray, and electric wire-arc spray. These energy sources are used to heat a coating material (in powder, wire, or rod form) to a molten or semi-molten state. The resultant heated particles are accelerated and propelled toward a prepared surface by either process gases or atomization jets. Upon impact, a bond forms with the surface and subsequent particles cause thickness buildup.

BRIEF OF THERMAL ARC SPRAY PROCESS

In this process, the raw material in the form of a pair of metallic wires is melted by an electric arc.      This molten material is atomized by compressed air & propelled towards the workpiece. The molten      spray solidifies on the component surface to form a dense & strongly adherent coating.

The Right Coating For The Job

• There are 50 different wires designed specifically for arc spraying. Wires include copper, zinc, aluminium, bronze, steel, nickel, stainless steel, haste alloy, inconel & a variety of cored wires. These proven materials are used in applications including.
• Wear Resistance, Electrical Conductivity, Corrosion Protection, Parts.

• Restoration, Bonding & Mold/Tool making.

ADVANTAGES

• No Thermal Stress.
• Cost Effective.
• Improved Surface Properties.
• Quicker Process.
• No Blow Holes & Porosity less than 2-3%.
• Machining/Grinding can be done.
• Temp. of the substrate does not exceed 80-120 deg C.
• Rework easily done.

HVOF

The High Velocity Oxygen Fuel (HVOF) process was developed to produce high quality metal, carbide and various specialty coatings. A complete line of powders are available, which are specifically engineered for application with the HVOF System. The commercialization of this coating technology now affords industry the ability to get unique coating properties and extend the range of applications which previously could only be performed by proprietary coating processes.

 

HIGH VELOCITY OXYGEN FUEL COATING

In the HVOF process, flammable gases, oxygen & feed stock are simultaneously fed into a specially designed chamber. A spark plug ignites the mixture & propels the semi-molted material onto the substrate. The ‘high velocity’ factor is the key to quality coatings produced by this method.

HVOF ADVANTAGES

1.HVOF reduces oxides in the coating due to the speed at which particles travel through the air.

2. The supersonic velocities and high temperature of HVOF produce superior coating densities & give the substrate its best possible protection from abrasion, erosion, wear resistance & corrosion.

COATING SPECIFICATION

COATING BENEFITS