OS1807 コールドスプレー模擬単粒子衝突試験によるAl粒子のミクロ組織に及ぼす衝突速度依存性

Abstract

In a cold spray technique, which used for making dense and thick metallic coatings without oxidation, a lot of fine solid particles are impinged at supersonic velocity and deposited on a substrate materials. The deposition behavior is affected by many factors, such as particle velocity, size, shape, material, temperature, surface condition, and so on. However, these influences are not completely understood, because accurate measurements of these factors are complicated. Therefore, we developed a large-scaled single particle shot system. Using this system, a pure Al particle with approx. 1 mm diameter was impinged and deposited on a pure Al substrate. The particle velocity was accurately measured and the critical velocity which deposition begins was evaluated. And the microstructure of deposited particles was investigated by SEM and EBSD. From the results, the plastic deformation in a particle increased with increasing particle velocity, and the crystal grains with large plastic deformation adjacent to the particle/substrate interface tended to contribute to adhesion between a particle and a substrate.