Quaternary diborides-improving the oxidation resistance of TiB2z coatings by disilicide alloying
MATERIALS RESEARCH LETTERS(2023)
摘要
To overcome the limited oxidation resistance of the emerging class of transition metal borides, we suggest within this study novel quaternary diborides, Ti-TM-Si-B-2 +/- z (TM = Ta, Mo), achieving the compromise between excellent oxidation resistance and requirements of hard coatings. Single-phase AlB2-type structured Ti-TM-Si-B-2 +/- z films (3-5 mu m) are sputter-deposited from TiB2/TMSi2 targets. The Ti-Ta-Si-B-2 +/- z coatings exhibit 36 GPa in hardness, while maintaining strongly retarded oxidation kinetics till 1000 degrees C. Ti-Mo-Si-B-2 +/- z coatings preserve a hardness up to 27 GPa, although outperforming all their counterparts by featuring outstanding oxidation resistance with 440nm oxide scale thickness after 1 h at 1200 degrees C. [GRAPHICS] IMPACT STATEMENT First report on quaternary Ti-TM-Si-B-2 +/- z coatings stabilized in hexagonal AlB2-prototype structures. These hard coating materials exhibit unprecedented oxidation resistance up to 1200 degrees C due to the formation of Si-rich scales.
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关键词
Titanium diboride,sputtering,thin films,oxidation resistance,UHTC,Disilicides
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