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<p>This study investigates the microstructural and mechanical properties of cold-sprayed AA7075 coatings reinforced with varying compositions of micro-boron carbide (µB<sub>4</sub>C) and boron nitride nanoplatelets (BNNPs). Functionally graded coatings (FGCs) with different ceramic content (10-30&#xa0;vol.% µB<sub>4</sub>C) were produced and analyzed for surface roughness, microstructure, hardness, and wear resistance. The inclusion of BNNPs improved particle distribution and reduced clustering in dual-reinforced compositions. Nanoindentation and wear tests show that coatings with higher µB<sub>4</sub>C content exhibited increased hardness and reduced wear rates, with a maximum hardness of 7.2&#xa0;GPa for Al-30%µB<sub>4</sub>C. The wear resistance improved up to 46.5% compared to unreinforced AA7075, with µB<sub>4</sub>C particles enhancing load transfer and minimizing frictional forces.</p>

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Microstructural Evolution and Tribological Performance of Functionally Graded Al-µB4C/BNNP Coatings Produced via Cold Spray

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Achyuth Kulkarni,
  • Michael Krenn,
  • Troy Y. Ansell

摘要

This study investigates the microstructural and mechanical properties of cold-sprayed AA7075 coatings reinforced with varying compositions of micro-boron carbide (µB4C) and boron nitride nanoplatelets (BNNPs). Functionally graded coatings (FGCs) with different ceramic content (10-30 vol.% µB4C) were produced and analyzed for surface roughness, microstructure, hardness, and wear resistance. The inclusion of BNNPs improved particle distribution and reduced clustering in dual-reinforced compositions. Nanoindentation and wear tests show that coatings with higher µB4C content exhibited increased hardness and reduced wear rates, with a maximum hardness of 7.2 GPa for Al-30%µB4C. The wear resistance improved up to 46.5% compared to unreinforced AA7075, with µB4C particles enhancing load transfer and minimizing frictional forces.