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Characterization of Amorphous Plasma Sprayed Coatings of FeCrPC and NiCrBSi

Abstrac: Amorphous coatings of FeCrPC and NiCrBSi alloys are produced by thermal plasma spraying. Microstructural studies are investigated by means of X-ray diffraction (XRD), scanning (SEM) and transmission (TEM) electron microscopy. The thickness of the resulting amorphous deposit may be up to 500 μm. From XRD, full amorphous coatings seem to be obtained but meticulous TEM examination has revealed the presence of crystallites of approximately 100 nm within size in the amorphous matrix. The particle size distribution of the powder is a determining factor that governs the percentage of particle melting and subsequently the amorphous content in the coating.