Abstract
This chapter focuses on several researches undertaken in the areas—the gas-dynamics of cold spray, interaction of a high-speed particle with the substrate and bonding mechanism, and related technologies and applications. Obtaining coatings by the cold spray method involves the use of a high-velocity gas flow for the accelerating and heating of particles. The particle velocity that can be reached in a cold spray facility is limited by the gas velocity. Owing to the use of high gas pressures, long nozzles, and fine particles, the particles move with a velocity close to the gas velocity that can be increased by using gases with low molecular weights and by gas heating. This approximation implies that the gas flow in a converging/diverging nozzle is isentropic and one dimensional. The gas is perfect and has a constant ratio of specific heats. Based on isentropic computations, it is concluded that the particle temperature is almost independent of pressure, but the particle velocity increases by 15% if the pressure is doubled.
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