Abstract
A fundamental question to address in plasma-sprayed coatings is the existence and quantification of open porosity percolating in the through thickness direction. Percolating porosity was disclosed in a 25% porous vacuum plasma-sprayed tungsten (VPS-W, density: 14.85g/cm3) via high energy synchrotron X-ray microtomography (beam energy: 52keV, voxel size: 1.4μm). Micro-tomography revealed that at least 80% of the globular pores are interconnected and percolating across the coating thickness.The presented methodology can be useful in the design of infiltrated plasma-sprayed composites as well as for the identification of percolation thresholds in plasma-sprayed microstructures.
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