HI Aaron
I think
what he should be saying:
* Most of thermal spray coating is a cold process with respect to the substrate.
"Hot spray and cold spray combustion powders" I can only think he is referring to normal powders (for cold process relative to substrate) and self-fluxing powders designed for fusing (hot process relative to substrate).
I don't think he is talking about the "cold spray" process (cold gas-dynamic spraying process).
Quote:In my mind cold spraying is when you use a soft material with high pressures with no heat.
Yes, except the gas is in fact heated. I think good definition would be cold process with respect to powder (non-melting) and substrate. HVOF and HVAF being somewhere in between a cold process relative to the powder and a hot process relative to the powder
Words can be very confusing