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<p>To address the high-temperature oxidation of carbon/carbon (C/C) composites, this study employed a novel molten salt electrophoretic deposition (MS-EPD) technique to fabricate a zirconium diboride (ZrB<sub>2</sub>) anti-oxidation coating. Using ZrB<sub>2</sub> nanoparticles synthesized in situ in molten salt as a precursor, a uniform and dense coating with a thickness of approximately 50&#xa0;μm and good adhesion to the substrate was obtained at an optimized deposition voltage of 1.0&#xa0;V. The coating exhibited excellent mechanical properties, with its nano-hardness and elastic modulus reaching as high as 35.8 and 510&#xa0;GPa, respectively, and a critical adhesion load with the substrate of 10.8&#xa0;N. This technique demonstrated high efficiency, with an average deposition rate of up to 0.865&#xa0;μm/min. High-temperature oxidation tests revealed that the coating forms a ZrO<sub>2</sub>–B<sub>2</sub>O<sub>3</sub> composite oxide layer above 973&#xa0;K, effectively blocking oxygen ingress. The coating continued to provide effective protection for the substrate after isothermal oxidation at 1173&#xa0;K in an air atmosphere for 5&#xa0;h. This research confirms that MS-EPD is an efficient, feasible, and promising technique for preparing high-performance anti-oxidation coatings on C/C composites.</p>

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Fabrication of ZrB2 anti-oxidation coating on carbon/carbon composite surface by molten salt electrophoretic deposition

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Yong Yuan,
  • Wenjuan Qi,
  • Junjie Xu,
  • Chuntao Ge,
  • Weiliang Jin,
  • Jun Zhang,
  • Saijun Xiao

摘要

To address the high-temperature oxidation of carbon/carbon (C/C) composites, this study employed a novel molten salt electrophoretic deposition (MS-EPD) technique to fabricate a zirconium diboride (ZrB2) anti-oxidation coating. Using ZrB2 nanoparticles synthesized in situ in molten salt as a precursor, a uniform and dense coating with a thickness of approximately 50 μm and good adhesion to the substrate was obtained at an optimized deposition voltage of 1.0 V. The coating exhibited excellent mechanical properties, with its nano-hardness and elastic modulus reaching as high as 35.8 and 510 GPa, respectively, and a critical adhesion load with the substrate of 10.8 N. This technique demonstrated high efficiency, with an average deposition rate of up to 0.865 μm/min. High-temperature oxidation tests revealed that the coating forms a ZrO2–B2O3 composite oxide layer above 973 K, effectively blocking oxygen ingress. The coating continued to provide effective protection for the substrate after isothermal oxidation at 1173 K in an air atmosphere for 5 h. This research confirms that MS-EPD is an efficient, feasible, and promising technique for preparing high-performance anti-oxidation coatings on C/C composites.