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<p>Laser cladding of a B<sub>4</sub>C + BN powder mixture with the addition of MgO and Li<sub>2</sub>O particles results in formation of ultra-hard coatings with the ultra-low coefficient of dry sliding friction. Complex composition of the mixture and high-density laser processing both facilitate multiple reaction pathways during melting. The present paper analyzes an interplay between processing conditions, chemical reactions and the final microstructure, which leads to coating’s outstanding tribological properties. The dominant reaction path in generation of the ceramic B<sub>4</sub>C + BN + MgO + Li<sub>2</sub>O coating is revealed as the formation of lithium metaborate <i>via</i> a series of consecutive redox reactions. This conclusion has been confirmed using thermochemical analysis proceeded at high temperatures and cross-examination with the observed microstructure.</p>

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Redox-Driven Formation of Lithium Metaborate for Ultra-Low Friction in B4C–BN Coatings with MgO and Li2O

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Mikhail Krivilyov,
  • Ekaterina Korobeynikova,
  • Sergey Reshetnikov,
  • Evgeny Kharanzhevskiy

摘要

Laser cladding of a B4C + BN powder mixture with the addition of MgO and Li2O particles results in formation of ultra-hard coatings with the ultra-low coefficient of dry sliding friction. Complex composition of the mixture and high-density laser processing both facilitate multiple reaction pathways during melting. The present paper analyzes an interplay between processing conditions, chemical reactions and the final microstructure, which leads to coating’s outstanding tribological properties. The dominant reaction path in generation of the ceramic B4C + BN + MgO + Li2O coating is revealed as the formation of lithium metaborate via a series of consecutive redox reactions. This conclusion has been confirmed using thermochemical analysis proceeded at high temperatures and cross-examination with the observed microstructure.