Kinetic spraying (or cold gas dynamic spraying) works by accelerating small solid particles to su... more Kinetic spraying (or cold gas dynamic spraying) works by accelerating small solid particles to supersonic velocities, and then impacting them onto a substrate. These high impact velocities, and low particle temperatures are the principal attributes of kinetic spraying technology. However, only recently has this technology's interfacial behavior, due to particle/substrate impaction, become well understood. In order to investigate the particle/substrate bond behavior, Al-Si feedstock was deposited onto mild steel, over a range of particle velocities; next, their respective coating bond strengths were measured by the stud pull coating adherence test. The effects of the particle velocity and the substrate surface roughness on the coating bond strength were presented, and a model of the particle/substrate bond generation was discussed in an effort to estimate the bond strength. #
Particle velocity is a very important parameter in kinetic spraying (or cold gas dynamic spraying... more Particle velocity is a very important parameter in kinetic spraying (or cold gas dynamic spraying). It is difficult to measure the velocity of a particle with supersonic speed at low temperature (lower than 500 8C). Thus, in many investigations only estimated values are used for evaluating coating processes. In this paper, the modeling of particle acceleration was reviewed, and the measurement of in-flight particle velocity in a kinetic spraying process was performed. Particle velocity and flux distributions from different process gas temperatures and pressures were investigated. The influences of process gas temperature and pressure on particle velocity were discussed. Characteristic of Al-Si feedstock deposition onto a mild steel substrate was described by comparing coatings structures with the in-flight particle conditions. The deposition behavior showed two critical particle velocities for Al-Si powder deposition onto a substrate and for particle-particle bonding. #
Kinetic spraying (or cold gas dynamic spraying) occurs when small solid particles are accelerated... more Kinetic spraying (or cold gas dynamic spraying) occurs when small solid particles are accelerated to supersonic velocity, and then impacted onto a substrate. In kinetic spraying processes, dense coatings are produced without any significant heating of the spray powder and substrate ...
Kinetic spraying (or cold gas dynamic spraying) works by accelerating small solid particles to su... more Kinetic spraying (or cold gas dynamic spraying) works by accelerating small solid particles to supersonic velocities, and then impacting them onto a substrate. These high impact velocities, and low particle temperatures are the principal attributes of kinetic spraying technology. However, only recently has this technology's interfacial behavior, due to particle/substrate impaction, become well understood. In order to investigate the particle/substrate bond behavior, Al-Si feedstock was deposited onto mild steel, over a range of particle velocities; next, their respective coating bond strengths were measured by the stud pull coating adherence test. The effects of the particle velocity and the substrate surface roughness on the coating bond strength were presented, and a model of the particle/substrate bond generation was discussed in an effort to estimate the bond strength. #
Particle velocity is a very important parameter in kinetic spraying (or cold gas dynamic spraying... more Particle velocity is a very important parameter in kinetic spraying (or cold gas dynamic spraying). It is difficult to measure the velocity of a particle with supersonic speed at low temperature (lower than 500 8C). Thus, in many investigations only estimated values are used for evaluating coating processes. In this paper, the modeling of particle acceleration was reviewed, and the measurement of in-flight particle velocity in a kinetic spraying process was performed. Particle velocity and flux distributions from different process gas temperatures and pressures were investigated. The influences of process gas temperature and pressure on particle velocity were discussed. Characteristic of Al-Si feedstock deposition onto a mild steel substrate was described by comparing coatings structures with the in-flight particle conditions. The deposition behavior showed two critical particle velocities for Al-Si powder deposition onto a substrate and for particle-particle bonding. #
Kinetic spraying (or cold gas dynamic spraying) occurs when small solid particles are accelerated... more Kinetic spraying (or cold gas dynamic spraying) occurs when small solid particles are accelerated to supersonic velocity, and then impacted onto a substrate. In kinetic spraying processes, dense coatings are produced without any significant heating of the spray powder and substrate ...
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