Des couches métallisées par projection thermique ont été examinées par des ondes thermiques et leurs chaleurs spécifiques et conductivités thermiques ont été évaluées. Les déviations des résultats expérimentaux de la théorie des milieux homogènes dans le domaine des basses fréquences servent à déterminer l'influence des différentes espèces de défauts. Les rôles des pores et des barrières thermiques ont été étudiés en comparant les résultats avec des modèles des milieux inhomogènes et on a trouvé que l'influence des barrières thermiques sur les propriétés des couches métallisées par projection est la plus importante. Abstract. 2014 Thermally-sprayed metal coatings were investigated with thermal waves and their specific heats and thermal conductivities were determined. The deviations of the experimental results from the theory of homogeneous solids at low frequencies served to determine the influence of different types of defects. The roles of the pores and the thermal barriers were studied by comparing the results to models of inhomogeneous media and the thermal barriers were found to affect significantly the coating properties.
A number of experimental methods including X-ray analysis, optical and electron microscopy, porosity measurements and thermal wave interferometry are applied for investigation of the properties of thermally sprayed coatings. Some conclusions about the influence of the chemical composition and the technological parameters on the structure and mechanical properties of the coatings are drawn
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