From the last decade, ceramic composites material reinforced with CNT and multiwalled carbon nanotube (MWCNT) is gaining popularity. These nanotubes can also be incorporated in thermally sprayed coatings to improve their mechanical, electrical, electronic properties.For example, when MWCNT is added to alumina as reinforcement an increase in hardness is observed.
A major challenge in processing such reinforced coatings is inhomogeneous mixing of MWCNT with the matrix phase.MWCNT has high surface energy and they tend to agglomerate in the powder. Poor dispersion centres, i.e., agglomerated chunks of MWCNT in the coating raises the stress concentration levels when a coated component is subjected to forces and exacerbate the properties.Inhomogeneous dispersion also results in weak anchoring between the splats.
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