A crystalline titanium nitride (TiN) layer on titanium foil is achieved using sodium amide (NaNH2) as a nitrogen source in LiCl–KCl molten salts. Nanoindentation testing revealed exceptional mechanical properties, with the nitrided surface achieving a hardness of approximately 20.6 GPa, representing more than a four-fold increase compared to the untreated titanium substrate.
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T. Wang, Y. Wang, S. Gao, J. Fan and S. Dai, Chem. Commun., 2025, 61, 12976 DOI: 10.1039/D5CC03614C
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