Scholarlink

<p>Plasma-sprayed high-entropy alloy coatings inevitably suffer from defects such as pores, cracks, and stress concentration, limiting their performance. To address this limitation, we propose a low-temperature plasma nitriding strategy that provides synergistic strengthening by delivering a nitrided surface layer while its inherent holding stage naturally yields an annealing effect. The effects of this process on the fracture toughness, corrosion, and wear resistance of as-sprayed AlCoCrFeNi<sub>2.1</sub> coatings were studied. The results demonstrate that the as-sprayed AlCoCrFeNi<sub>2.1</sub> coatings form a 2.62 ± 0.25&#xa0;μm AlN/CrN composite layer after low-temperature plasma nitriding, while the concomitant thermal energy heals pores and microcracks. Compared to the non-nitrided coatings, the nitrided coating exhibits a 57% increase in surface hardness coupled with improved fracture toughness and interlayer bonding. Notably, the corrosion resistance and wear resistance of as-sprayed coatings are significantly enhanced after the plasma nitriding treatment, which is attributed to the dual effects of nitride formation and defect healing. The findings of this study could pave the way toward the design and preparation of high-performance as-sprayed coatings.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Performance Optimization of AlCoCrFeNi2.1 Coatings via Low-Temperature Plasma Nitriding: The Dual Effects of Nitriding and Annealing Treatment

  • 期刊论文

  • 发表日期：

    2026年5月6日

查看全文
  • Xin Zhang,
  • Jie Guo,
  • Zhibo Liu,
  • Xinjian Cao,
  • Jun Cheng,
  • Haixin Li,
  • Weimin Liu

摘要

Plasma-sprayed high-entropy alloy coatings inevitably suffer from defects such as pores, cracks, and stress concentration, limiting their performance. To address this limitation, we propose a low-temperature plasma nitriding strategy that provides synergistic strengthening by delivering a nitrided surface layer while its inherent holding stage naturally yields an annealing effect. The effects of this process on the fracture toughness, corrosion, and wear resistance of as-sprayed AlCoCrFeNi2.1 coatings were studied. The results demonstrate that the as-sprayed AlCoCrFeNi2.1 coatings form a 2.62 ± 0.25 μm AlN/CrN composite layer after low-temperature plasma nitriding, while the concomitant thermal energy heals pores and microcracks. Compared to the non-nitrided coatings, the nitrided coating exhibits a 57% increase in surface hardness coupled with improved fracture toughness and interlayer bonding. Notably, the corrosion resistance and wear resistance of as-sprayed coatings are significantly enhanced after the plasma nitriding treatment, which is attributed to the dual effects of nitride formation and defect healing. The findings of this study could pave the way toward the design and preparation of high-performance as-sprayed coatings.