Coating issues

Cause	Measure
Particle size distribution too fine	Consult with powder suppliers
Moisture in the powder due to improper storage	Powder must stored dry at processing temperature
Sintering at the baffle plate and the nozzle due to excessive conveying air pressure Damage to nozzles by too high an air pressure of the feed air	Reduce conveying air
	Check for wear on the injector - collecting nozzle
Poor fluidization in the powder tank due to moist compressed air or blocked fluid plate, fluid tubes	Check compressed air for contamination, replace fluid plate or fluid pipes