Hi Intel55
Quote:Higher particle temperature can also result in higher tensile stresses in coatings which is undesirable.
It is important really to know in what context this statement was made.
First, tensile stresses in many thermal spray coatings are a fact of life, they form mainly from solidification and cooling shrinkage (see
https://gordonengland.co.uk/tsc.htm#STRESS. The higher the tensile stress the more likely cracking and delamination will occur in the coating. Coating thickness plays a big part here as well, the higher the tensile stress the lower the coating thickness limitation.
I assume the statement is in context with thermal spray process types, like comparing plasma to HVOF to cold spray (cold gas-dynamic spraying). Both particle temperature and velocity are important. Generally the lower the temperature and the higher the velocity of particles the less tensile stresses are generated. In fact some HVOF and cold spray produce coatings with compressive stress. This is because there is less solidification and cooling shrinkage involve and an increase in mechanical deformation of the particles on impact.
Hope that helps