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<p>As the core component of rotary tillers, a blade’s performance directly determines the farming efficiency and economy. However, the rotary tiller blade (RTB) has always faced two major predicaments, that is, severe wear and adhesion, which largely increase the tillage resistance and decrease the sustainable operation ability. This study presents a laser additive and subtractive hybrid manufacturing method for the wear-resistant and hydrophobic composite micro-surfacing of RTBs: an iron-based alloy coating is prepared by continuous-laser cladding, and then the bionic dung beetle microstructure is generated using picosecond-laser ablating. The results showed that the composite micro-surfacing had multi-scale characteristics, i.e., 200&#xa0;μm cylindrical micro-convex bodies, micrometer-sized cellular-like bodies (metal oxides formed at high temperatures) and pores in the grooves. The micro-surfacing on the coating showed better wear-resistant performance than the matrix material, and maintained a stable shape during continuous wear. Besides, the micro-surfacing showed excellent hydrophobic performance, with a maximum contact angle of 125.9°. More importantly, when the spacing of the micro-convex bodies was 250&#xa0;μm, the hydrophobic effect was minimally affected by the mechanical wear, only decreasing by approximately 6%. This research is of great significance for improving the service performance and lifespan of RTBs.</p>

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Fabricating wear-resistant and hydrophobic micro-surfacing for rotary tiller blade via laser additive-subtractive hybrid manufacturing

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Chengfeng He,
  • Meiling Li,
  • Yushu Nai

摘要

As the core component of rotary tillers, a blade’s performance directly determines the farming efficiency and economy. However, the rotary tiller blade (RTB) has always faced two major predicaments, that is, severe wear and adhesion, which largely increase the tillage resistance and decrease the sustainable operation ability. This study presents a laser additive and subtractive hybrid manufacturing method for the wear-resistant and hydrophobic composite micro-surfacing of RTBs: an iron-based alloy coating is prepared by continuous-laser cladding, and then the bionic dung beetle microstructure is generated using picosecond-laser ablating. The results showed that the composite micro-surfacing had multi-scale characteristics, i.e., 200 μm cylindrical micro-convex bodies, micrometer-sized cellular-like bodies (metal oxides formed at high temperatures) and pores in the grooves. The micro-surfacing on the coating showed better wear-resistant performance than the matrix material, and maintained a stable shape during continuous wear. Besides, the micro-surfacing showed excellent hydrophobic performance, with a maximum contact angle of 125.9°. More importantly, when the spacing of the micro-convex bodies was 250 μm, the hydrophobic effect was minimally affected by the mechanical wear, only decreasing by approximately 6%. This research is of great significance for improving the service performance and lifespan of RTBs.