Laser ZrB2-Based Coating on Graphite
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A coating ≤50 μm thick is produced on graphite by laser melting of a ZrB2-based powder layer with additions of zirconium and molybdenum silicides in air. The main coating phases are ZrB2, SiO2, and ZrSiO4. The surface is formed by spherical particles 10–80 μm in size, representing a two-phase eutectic in the ZrSiO4–SiO2 system as needlelike crystals. Microhardness of the coating is 2.5 times higher than that of the substrate and reaches 15 ± 1 GPa.
Keywordslaser melting graphite coating zirconium diboride
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