Scholarlink

<p>The surface coatings for strip casting rolls must exhibit both fast interfacial heat transfer and excellent wear resistance. However, industrial electroplated Cr coatings suffer from process complexity, environmental concerns, and cracking caused by the large thermal expansion mismatch between Cr and Cu elements. Benefiting from the superior solubility between Ni and Cu and the reinforcement of ceramic phases, four representative Ni-based coatings (Ni60, Ni60-WC, NiCr-Cr<sub>3</sub>C<sub>2</sub>, and WC-Cr<sub>3</sub>C<sub>2</sub>-Ni) were fabricated via high-velocity oxygen fuel spraying in this study and systematically evaluated for their interfacial heat transfer, wettability, and wear resistance. The results showed that among the studied coatings, the ceramic-free Ni60 coating exhibited the highest heat flux (9.75&#xa0;MW/m<sup>2</sup>) but the lowest hardness (672&#xa0;HV<sub>0.3</sub>) and poor wear resistance. Ni60-WC showed the largest surface roughness (Sa = 19.8&#xa0;<i>μ</i>m) due to unmelted WC particles, while NiCr-Cr<sub>3</sub>C<sub>2</sub> presented limited heat flux (8.03&#xa0;MW/m<sup>2</sup>). In contrast, the WC-Cr<sub>3</sub>C<sub>2</sub>-Ni coating demonstrated optimal comprehensive performance, combining the lowest contact angle (125&#xa0;deg), relatively high heat flux (8.74&#xa0;MW/m<sup>2</sup>), excellent hardness (1422.5&#xa0;HV<sub>0.3</sub>), and minimal wear depth (15.61&#xa0;<i>μ</i>m) among the studied coatings. These differences in coating performance are primarily attributed to variations in ceramic phase fraction, which significantly enhances wear resistance while concurrently increasing surface energy, thereby improving wettability behavior. However, this microstructural modification also introduces additional interfacial thermal resistance, leading to a reduction in effective thermal conductivity, which harms the actual heat transfer performance.</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

Interfacial Heat Transfer, Wetting Behavior, and Wear Resistance of Thermally Sprayed Ni-Based Ceramic-Reinforced Coatings for Strip Casting Rolls

  • 期刊论文

  • 发表日期：

    2026年4月17日

查看全文
  • Lulu Song,
  • Shaogang Li,
  • Chenyang Zhu,
  • Wanlin Wang,
  • Hairong Guo,
  • Jie Zeng,
  • Guomin Ying,
  • Hualong Li

摘要

The surface coatings for strip casting rolls must exhibit both fast interfacial heat transfer and excellent wear resistance. However, industrial electroplated Cr coatings suffer from process complexity, environmental concerns, and cracking caused by the large thermal expansion mismatch between Cr and Cu elements. Benefiting from the superior solubility between Ni and Cu and the reinforcement of ceramic phases, four representative Ni-based coatings (Ni60, Ni60-WC, NiCr-Cr3C2, and WC-Cr3C2-Ni) were fabricated via high-velocity oxygen fuel spraying in this study and systematically evaluated for their interfacial heat transfer, wettability, and wear resistance. The results showed that among the studied coatings, the ceramic-free Ni60 coating exhibited the highest heat flux (9.75 MW/m2) but the lowest hardness (672 HV0.3) and poor wear resistance. Ni60-WC showed the largest surface roughness (Sa = 19.8 μm) due to unmelted WC particles, while NiCr-Cr3C2 presented limited heat flux (8.03 MW/m2). In contrast, the WC-Cr3C2-Ni coating demonstrated optimal comprehensive performance, combining the lowest contact angle (125 deg), relatively high heat flux (8.74 MW/m2), excellent hardness (1422.5 HV0.3), and minimal wear depth (15.61 μm) among the studied coatings. These differences in coating performance are primarily attributed to variations in ceramic phase fraction, which significantly enhances wear resistance while concurrently increasing surface energy, thereby improving wettability behavior. However, this microstructural modification also introduces additional interfacial thermal resistance, leading to a reduction in effective thermal conductivity, which harms the actual heat transfer performance.