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Air Preparation

When using compressed air and/or other carrier gases, it is paramount that the gas complies with a minimum specification of dryness and cleanness (ISO 8573.1 & ISO12500 Class 2) in order to maximize the life of the high-power heater core and ensure the smooth operation of the powder feeding system. If clumping of the feedstock powder due to moisture and contaminants is avoided, the SST process provides the best deposition efficiency and ensures that the applied coating or the substrate will not become compromised during the spraying process.

Air Quality Standards ISO 8573.1 & ISO12500

*Air quality required for SST Cold Spray (Class 2)

Class Solid Particles, Particle Size (mm) Humidity and Liquid Water Oil  
  0.10 < d ≤ 0.50 0.50 < d ≤ 1.00 1.0 < d ≤ 5.0 Pressure Dew Point Total Concentration:
Aerosol, Liquid and Vapor
 
  Maximum Number of Particles per m3 °C °F mg/m3 ppm/w/w  
0 As Specified As Specified As Specified As Specified  
1 100 1 0 ≤ -70 -94 ≤ 0.01 ≤ 0.008  
*2 100,000 1,000 10 ≤  -40 -40 ≤ 0.1 ≤ 0.08 SST Cold Spray
3   10,000 500 ≤ -20 -4 ≤ 1.0 ≤ 0.8  
4     1,000 ≤ +3 38 ≤ 5.0 ≤ 4 Std shop air
5     20,000 ≤ +7 45      
6       ≤ +10 50      
      Liquid Water Content Cw g/m3    
7       Cw ≤ 5      
8       0.5 < Cw ≤ 5      
9       5 < Cw ≤ 10      
Per ISO 8573=1:2001 (E)

























SST recommends that a 2-micron filter is used and that the carrier air has a -40 °C dew point. This is a little drier than the standard -33 °C rating common to many air preparation equipment specifications. 

Cartridge Filters
  • Cartridge filters are comparatively low in cost but they require maintenance. Usually, a pre-filter of between 20 microns to 5 microns is used to remove the bulk of moisture and contamination. This technique improves the service life of the cartridge filter. As the filter cartridge becomes burdened with contamination, the output flow rate will decrease. Routine maintenance is necessary to ensure that the process efficiency will not be impacted by the flow rate decline.
Membrane Filters
  • Membrane filters require less maintenance than cartridge filters because the membrane does not trap but rather isolates the contamination from the downstream system. Typically, these devices are self-cleaning by either gravity or an active process. It is common for membrane filters to consume about 5 m3/h (3 SCFM) of air.
Refrigerated Compressed Air Dryer
  • A refrigerated dryer can also be used to eliminate moisture from the compressed air supplied to the cold spray system. If the refrigerated dryer is part of an already existing air compressor system, ensure that the dryer is properly set and capable of getting the air dry enough.
Refrigerated Compressed Air Dryer
  • A refrigerated dryer can also be used to eliminate moisture from the compressed air supplied to the cold spray system. If the refrigerated dryer is part of an already existing air compressor system, ensure that the dryer is properly set and capable of getting the air dry enough.
Contact SST for additional information.


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