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<p>In this work, the microstructure, mechanical, and tribological properties of as-cast 2A70, as-cast ZrO<sub>2</sub>@CNTs/2A70 composites, as-extruded 2A70 and as-extruded ZrO<sub>2</sub>@CNTs/2A70 composites were investigated. The as-cast ZrO<sub>2</sub>@CNTs/2A70 composites were prepared by pre-dispersing ZrO<sub>2</sub>@CNTs using ball milling and applying ultrasonic vibrations during melt casting. The morphology and distribution of the second phase were improved by hot extrusion and the distribution of ZrO<sub>2</sub>@CNTs was observed under SEM by deep corrosion. The mechanical properties of the materials were examined. Further, the dry sliding tribological properties were evaluated at different loads (20N, 40N, and 60N) and sliding speeds (0.19&#xa0;m/s and 0.57&#xa0;m/s). The results show that ZrO<sub>2</sub>@CNT was uniformly distributed in the composites after extrusion. As-extruded ZrO<sub>2</sub>@CNTs/2A70 composites had the highest ultimate compressive strength, but lower elongation than as-extruded 2A70. The increase in load and sliding velocity led to a change in the wear state, which had a significant effect on the wear rate.</p>

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Effects of Hot Extrusion, Load, Sliding and Velocity on the Wear Properties of ZrO2@CNTs/2A70 Composites

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Zhaowei Huang,
  • Yushun Lei,
  • Huian Zhu,
  • Hong Yan

摘要

In this work, the microstructure, mechanical, and tribological properties of as-cast 2A70, as-cast ZrO2@CNTs/2A70 composites, as-extruded 2A70 and as-extruded ZrO2@CNTs/2A70 composites were investigated. The as-cast ZrO2@CNTs/2A70 composites were prepared by pre-dispersing ZrO2@CNTs using ball milling and applying ultrasonic vibrations during melt casting. The morphology and distribution of the second phase were improved by hot extrusion and the distribution of ZrO2@CNTs was observed under SEM by deep corrosion. The mechanical properties of the materials were examined. Further, the dry sliding tribological properties were evaluated at different loads (20N, 40N, and 60N) and sliding speeds (0.19 m/s and 0.57 m/s). The results show that ZrO2@CNT was uniformly distributed in the composites after extrusion. As-extruded ZrO2@CNTs/2A70 composites had the highest ultimate compressive strength, but lower elongation than as-extruded 2A70. The increase in load and sliding velocity led to a change in the wear state, which had a significant effect on the wear rate.