Scholarlink

<p>This study investigates the interfacial and tribological role of graphene in Al7150-based hybrid nanocomposites reinforced with B<sub>4</sub>C and varying graphene contents (0.1-0.4&#xa0;wt.%). The work aims to optimize the balance between hard ceramic and solid lubricant phases to achieve superior dry-sliding wear resistance for lightweight automotive and aerospace applications. Pin-on-disk tests against an EN31 steel counterface were performed under loads of 10-50&#xa0;N, sliding velocities of 0.5-1.5&#xa0;m/s, and distances of 500-1500&#xa0;m. The incorporation of graphene substantially reduced the coefficient of friction by ~ 38% (from 0.33 to 0.20) and the specific wear rate by ~ 38% (1.23 to 0.20 × 10<sup>−13</sup>&#xa0;m<sup>3</sup>/Nm) primarily due to the formation of a graphene-derived tribo-film that stabilized friction and minimized material loss. The synergistic strengthening of B<sub>4</sub>C and graphene enhanced hardness and suppressed severe wear through the development of a dense mechanical mixed layer. At elevated loads, wear volume reduction was attributed to the evolution of a protective carbonaceous layer that restricted plowing and delamination. SEM-EDS analyses confirmed the presence of a carbon-rich transfer film and smearing features characteristic of dry-sliding wear. These findings highlight the critical function of graphene-mediated interfacial synergy in governing frictional energy dissipation and wear mechanisms in aluminum hybrid nanocomposites.</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

Effect of Graphene on Friction Characteristics and Wear Mechanism of Al-B4C-Graphene Hybrid Nanocomposites Fabricated by Double Ultrasonic Two-Stage Stir Casting

  • 期刊论文

  • 发表日期：

    2026年6月18日

查看全文
  • Deepak Kumar,
  • R. Seetharam,
  • K. Ponappa

摘要

This study investigates the interfacial and tribological role of graphene in Al7150-based hybrid nanocomposites reinforced with B4C and varying graphene contents (0.1-0.4 wt.%). The work aims to optimize the balance between hard ceramic and solid lubricant phases to achieve superior dry-sliding wear resistance for lightweight automotive and aerospace applications. Pin-on-disk tests against an EN31 steel counterface were performed under loads of 10-50 N, sliding velocities of 0.5-1.5 m/s, and distances of 500-1500 m. The incorporation of graphene substantially reduced the coefficient of friction by ~ 38% (from 0.33 to 0.20) and the specific wear rate by ~ 38% (1.23 to 0.20 × 10−13 m3/Nm) primarily due to the formation of a graphene-derived tribo-film that stabilized friction and minimized material loss. The synergistic strengthening of B4C and graphene enhanced hardness and suppressed severe wear through the development of a dense mechanical mixed layer. At elevated loads, wear volume reduction was attributed to the evolution of a protective carbonaceous layer that restricted plowing and delamination. SEM-EDS analyses confirmed the presence of a carbon-rich transfer film and smearing features characteristic of dry-sliding wear. These findings highlight the critical function of graphene-mediated interfacial synergy in governing frictional energy dissipation and wear mechanisms in aluminum hybrid nanocomposites.