Session BB1.7

11:00 AM BB1.7
HVOF PARTICLE VELOCITY AND TEMPERATURE AND THEIR RELATIONSHIP TO COATING PROPERTIES. S.R. Bekofske and G.S. Settles, The Pennsylvania State University, University Park, PA.

Little is currently known of the relationship between HVOF particle temperature and velocity and the properties of the resulting coating. It is useful to have the ability to tailor the kinetic and thermal energy state of sprayed particles to yield certain desired coating properties. Here, particle streak velocimetry and 2-color pyrometry are used to measure the particle kinetic and thermal state in flight. Control of these properties over certain ranges has already been demonstrated in our prior work. In the present paper, corrosion-resistant coatings are sprayed and analyzed by metallography and other techniques to determine several pertinent coating parameters. By varying the in-flight particle state, a range of different coating properties is observed. An attempt is then make to define physical relationships among HVOF spraygun parameters, particle thermal and kinetic properties, and the properties of the resulting coatings. This knowledge is expected to contribute both fundamentally and practically to thermal spray technology.