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<p>Irregular dimples were prepared on the polished surface of an Al<sub>2</sub>O<sub>3</sub> coating using laser texturing technology. Subsequently, the modified PTFE emulsion (M-PTFE) was infiltrated into the dimples via vacuum impregnation to obtain the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating. The microstructure and tribological behavior of the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating were systematically characterized and compared with those of the Al<sub>2</sub>O<sub>3</sub> coating. The results demonstrated that M-PTFE successfully penetrated into the bottom of the textured dimples. Compared with the Al<sub>2</sub>O<sub>3</sub> coating, the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating formed a continuous and stable PTFE lubricating film during the sliding process, which endowed it with outstanding friction-reducing and wear-resistant characteristics. The friction coefficient of the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating (0.08) was approximately 7 times lower than that of the Al<sub>2</sub>O<sub>3</sub> coating (0.57). The wear rate of the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating after 2.5 × 10<sup>5</sup> sliding cycles was 4.36 × 10<sup>−8</sup>&#xa0;mm<sup>3</sup>(N⋅m)<sup>− 1</sup>, representing a reduction of four orders of magnitude compared with that of the Al<sub>2</sub>O<sub>3</sub> coating (2.53 × 10<sup>−4</sup>&#xa0;mm<sup>3</sup>(N⋅m)<sup>− 1</sup>) measured after 2 × 10<sup>4</sup> cycles. Furthermore, the Al<sub>2</sub>O<sub>3</sub> counterface ball sliding against the Al<sub>2</sub>O<sub>3</sub>-PTFE composite coating exhibited minimal surface degradation. This approach effectively bridges the gap between the hardness of ceramics and the lubrication requirements, offering a scalable and cost-effective solution for industrial applications where dry sliding performance is critical.</p>

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Comparative Study of Tribological Characteristics of Al2O3 Coating Combined of Laser Surface Texturing and PTFE Solid Lubrication

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Xubin Zhang,
  • Wen Deng,
  • Yazhen Zhang,
  • Shuwen Sun,
  • Mingbao Wang

摘要

Irregular dimples were prepared on the polished surface of an Al2O3 coating using laser texturing technology. Subsequently, the modified PTFE emulsion (M-PTFE) was infiltrated into the dimples via vacuum impregnation to obtain the Al2O3-PTFE composite coating. The microstructure and tribological behavior of the Al2O3-PTFE composite coating were systematically characterized and compared with those of the Al2O3 coating. The results demonstrated that M-PTFE successfully penetrated into the bottom of the textured dimples. Compared with the Al2O3 coating, the Al2O3-PTFE composite coating formed a continuous and stable PTFE lubricating film during the sliding process, which endowed it with outstanding friction-reducing and wear-resistant characteristics. The friction coefficient of the Al2O3-PTFE composite coating (0.08) was approximately 7 times lower than that of the Al2O3 coating (0.57). The wear rate of the Al2O3-PTFE composite coating after 2.5 × 105 sliding cycles was 4.36 × 10−8 mm3(N⋅m)− 1, representing a reduction of four orders of magnitude compared with that of the Al2O3 coating (2.53 × 10−4 mm3(N⋅m)− 1) measured after 2 × 104 cycles. Furthermore, the Al2O3 counterface ball sliding against the Al2O3-PTFE composite coating exhibited minimal surface degradation. This approach effectively bridges the gap between the hardness of ceramics and the lubrication requirements, offering a scalable and cost-effective solution for industrial applications where dry sliding performance is critical.