The Effect of Heat Temperature on the Structure of Plasma Coating of the Ni-Cr-Si-B System

Abstract:

The powder of the Ni-Cr-Si-B system was applied on tubes of low carbon steel (0.2 % C) with the help of air-plasma spraying. The effect of heating temperature on the microstructure of obtained coatings was analyzed in this paper. The coatings were heated up to 500, 600, 700, 800, 900, 1000, and 1100 °C and cooled in the air. It was shown by the method of optical and scanning electron microscopy (SEM) and the X-ray diffraction analysis (XRD) that the same phases (γ-Ni, Ni₃B, Ni₃Si and Cr₂B) were present in the coatings before and after heating. Chromium carbide Cr₇C₃ was observed in the coating structure after heating to above 1000 °C. Coatings which were heated to 1000 °C consisted of grains of the solid nickel base solution, micro volumes of the Ni+Ni₃Si eutectic with inclusions of Ni₃B and particles of Cr₇C₃. The coatings which were crystallized from a liquid state (heated up to 1100 °C) consisted of large areas of the solid nickel base solution and particles of chromium carbide Cr₇C₃. The space between nickel areas is filled by the Ni₃Si+Ni₃B eutectic.

• Periodical: Applied Mechanics and Materials (Volume 788)
• Pages: 252-258
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.788.252
• Online since: August 2015
• Authors: Elena Kornienko*, Aelita Nikulina, Ekaterina Drobyaz, Natalya V. Plotnikova, Elizaveta Lapushkina, Viktor Kuzmin
• Keywords: Air-Plasma Spraying, Heating, Self-Fluxing Powder

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