SL System - Low Melting Point Spraying
The unique Kermetico Specialised HVAF SL System has been designed to metal spray with a low melting point temperature. It deposits bulk-like, non-oxidized, dense aluminum, tin, copper, zinc and alloyed metal coatings.
The twin wire arc and flame spray processes apply aluminum or copper with high spray rates along with high porosity and high oxide levels so that the coating is inexpensive while it is of poor quality.
The cold spray process sprays a coating without oxidation and with low porosity, but its low spray rate and high equipment and gas costs make this coating expensive.
The Kermetico SL HVAF system provides an option to spray low melting point materials, like zinc coating, at up to a 10kg (22 lbs.) per hour spray rate, without oxidation, and with an applied cost not substantially higher than twin wire arc spray.
Thermal Spraying a Tin Coating with the Kermetico SL High Velocity System. For more on this application, Click Here.
Process
- HVAF machine sprays metals and carbides at optimal temperature, not overheating it. That is how we are spraying bulk-like gas and liquid impermeable wear and corrosion resistant coatings.
- The HVAF SL Gun sprays metal powders, heated and accelerated by the air-fuel gas combustion products
- The mixture of compressed air and the chosen fuel gas flows into the combustion chamber through the orifices of a catalytic ceramic insert
- The initial ignition of the mixture results in the heating of the insert above the mixtures’ auto-ignition temperature, and then the hot insert continuously ignites the mixture
- When entering the gun, the compressed air cools the chamber and the nozzle assembly.
- Then part of the preheated air is mixed with the chosen fuel gas and combusted.
- The metal spray powder is injected axially into a wide combustion chamber.
- The powder exiting the chamber is propelled into the nozzle of chosen length and configuration, where it is accelerated to a velocity that may be over 1,000 m/s (3300 ft./sec.)
- When impacting a substrate, the spray powder particles form a metal coating
The above video shows the SL HVAF system's ablility to clad 10+ mm layers of machinable aluminum, copper, and alloys.
Key Features
- Axial metal powder injection.
- Protection against feedstock oxidation.
- No metal evaporation in the coating process.
- No nozzle clogging.
- Uniform, dense, high-bond Al, Zn, Sn, Cu and copper alloys coatings.
- High metal spray rate:6 kg/hour (13 lbs./hour) for aluminum coatings.
- 10 kg/hour (22 lbs./hour) for copper, bronze, brass, tin and zinc coatings.
- Blast & spray operation capable.
- Air cooling (no need for water chiller, mobile friendly).
- Allows deposition of copper and its alloys (including brass, bronze and even some special grades of Cu-In-Ga) in “warm-spray” and “hot-spray” modes.
Click on the following link for more information on the HVAF SL Low Melting Point Spray System.
