Mettech’s plasma spray systems are in continuous production use around the world, demonstrating benefits such as:

• High coating quality and consistency
• High production rates
• Reduced operating costs
• Compliance with required safety and regulatory practices and standards

Mettech’s product offering includes:

Equipment

MT150 – Axial III™ Plasma Spray System
MT-TMC – Powder Feeder

Axial III™ Plasma Spray System

Coatings

Mettech supports its customers with a Coating Development Program for ceramics, cermets, metastable nano-oxides, metals and alloys. Current customer applications include:

• Thermal Barrier Coatings
• Anilox Roll Coatings
• Chrome Replacement Coatings
• Abradable Coatings
• Fuel Cell Coatings

Power Supplies

• Industrial Proven Design
• Built-in high voltage pulse arc start
• Input voltage protection
• Forced air-cooled

User Interface

• Touch Screen
• Full display of process variables
• Data trends & recording
• Self diagnostic tool

Axial III™ Cabinets

Control Cabinet

• Segregation between water/gas MFC’s
  and electrical PLC’s
• CE marked
• Process feedback control
• Gas pressure transducers
• Water flow and temperature
  measurement for system
  heat balance

Axial III™ Plasma Spray Torch

Axial III™ Plasma Spray Torch

• Tri-electrode plasma torch with central
  axial powder injection
• Optional inert gas shroud
• 50 - 150kW operation

Benefits

Increased feed rates

The Mettech Axial III™ System injects powders directly into the center of the plasma flame, thereby entraining virtually 100% of powder in the hot zone. Significantly higher feed rates can be used, subsequently resulting in increased production. Powders flow freely into the center of the plasma flame through a proprietary nozzle design, resulting in velocities that significantly higher than standard plasma torches - and approach those attained with HVOF systems.

Improved coating quality & consistency

Better entrainment of the powder in the plasma flame ensures effective heating and melting of the feedstock. The result is coatings of considerably higher quality and consistency than can be achieved by any other commercially available plasma spray system. Mettech coatings are capable of meeting highly demanding standards for hardness, porosity and thickness.

Highly Adaptable
The Mettech Axial III™ System has superior temperature and chemistry control. It is highly adaptable, handling injection of materials in liquid, gas and solid form. Furthermore, the design of the Axial IIItm System allows it to spray reactive materials such as titanium without a vacuum chamber, by excluding air from the plasma flame – giving our customers a range of new coating opportunities.

Operation

The Axial III™ Plasma Spray Torch is a 3-anode/3-cathode DC plasma torch with powder injection along the central axis. The plasma streams converge at the point where the powder is injected. At this point, the plasma/powder flow is accelerated through a specially designed nozzle. Powder velocities are significantly higher than other plasma torches and approach those attained with HVOF systems. The resultant coatings produced by the Mettech Axial IIItm System are very consistent, reproducible and of a superior quality.

Anode-Cathode Cutaway

Three-Gas Chemistry

The Axial III™ Plasma Spray Torch utilizes three gases: Argon (Ar), Nitrogen (N2), and Hydrogen (H2), or Helium (He) can be substituted for H2. The Axial IIItm can operate using either Argon or Nitrogen as the primary gas. Factory set maximum flow rates for the gases are:

Ar: 400 l/min
N2: 200 l/min
H2: 100 l/min or
He: 140 l/min

Gas Schematic