G0500-6-3 コールドスプレーの付着効率に与える粒径分布の影響に関する数値シミュレーション([G0500-6]流体工学部門一般講演(6))

Abstract

Cold spray is one of the thermal spray technologies to make a coating on a solid surface. In the cold spray, the solid particles are accelerated by a supersonic flow of an inert gas with the temperature of less than 1000 degrees Celsius. It is experimentally well known that when a particle impact velocity exceeds a critical value, the particle is formed into a coating. From the practical point of view, the deposition efficiency, which is the ratio of the deposited mass on of the particle against the sprayed mass of the particles, is an important parameter. The parameters which affect the deposition efficiency are, for example, the particle diameter, the type of powder material, the gas pressure and temperature. The deposition efficiency can be obtained experimentally. However, a computational approach could efficiently reduce the cost of estimation evaluate the effects of parameters on the deposition efficiency. In the present study, the effect of particle size distribution of the powder on the deposition efficiency is clarified by numerical simulation.