Abstract
The cold spray technique is a new coating technology that is based on the high velocity impinging of small solid particle on the substrate. This technique allows producing a thick deposit with less heat influence. The previous research shows cold-sprayed thick deposit and coatings have unique mechanical properties. Since this material has stacked structure of highly plastic deformed feedstock particles, it indicates an anisotropic microstructure and mechanical properties. This unique material indicates brittle-like fracture that a crack is propagated in particle-to-particle interface. Therefore, structural control technique must be established to become practical application of cold-sprayed coatings. Heat treatment is one of the effective ways to control the microstructure. This study discusses the effect of heat treatment on the texture changing. The texture evaluations were carried out by two different scale methods. One is traditional XRD pole figure technique and the other is SEM-EBSD micro-scale evaluation. From those investigations results, heat treatment has only effect on grain size changing. The micro scale and macro scale texture were not changed by heat treatment. Therefore, the mechanical property of cold-sprayed coating is strongly corresponding to the interface strength of particle-to-particle. The texture is only a small influence on mechanical properties. The established structural control technique requires the interface strength control of particle-to-particle.
