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Ask the Experts Metals

Could gas purity be the reason for the variability in my thermal spray coating density, hardness and adhesion?

Zbigniew Zurecki
Research Associate

Gas purity, pressure and flow rate fluctuations can all cause inconsistent coatings. When troubleshooting plasma spray and HVOF applications, it’s important to look for things like properly sized valves, regulators and stainless steel lines from gas source to spray gun, plus bulk gas supply utilization, which provides higher purity and flow consistency than cylinders. Potential trouble spots include inferior rubber gaskets and diaphragms, greasy O-rings, acrylic flowmeters and many quick disconnects. Also, leaks from loose fittings and connections can entrain ambient air, resulting in gas impurities and a safety hazard.

Air Products can help troubleshoot your purity, pressure and flowrate challenges through a diagnostic audit that includes a gas analysis and piping design review. To schedule, call 800-654-4567.

Hear Robert Swan, Applications Engineer at Air Products, expand on Zbigniew's answer.

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