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<p>An electrohydraulic proportional servo hydraulic valve has good intelligent control performance and is the core control component in a hydraulic system. In the working process of an electrohydraulic proportional servo valve, the working principle determines that the spool surface will produce friction wear, which will threaten the safety of the entire hydraulic system when severe. Therefore, in industry, coatings are often applied to the surface of a material to improve its wear resistance. In this study, two diamond-like carbon (DLC) coatings and three nitride coatings were successfully prepared on the surface of a spool material (40cr), and the five coatings were DLC1, DLC2, TiN, CrN, and CrAlN. The microstructures and mechanical and tribological properties of the five coatings were compared. Finally, the effects of the five coatings on the dynamic response characteristics of the servo valve were analyzed using an Amesim simulation. Compared with those of the substrate, the wear rates of the five coatings were reduced by approximately 98%, 98%, 86%, 90%, and 80%. The DLC coatings exhibited better wear resistance than did the nitride coatings.</p>

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Comparative Study of the Tribological Properties of Diamond-Like Carbon and Nitride Coatings Deposited on 40Cr Surfaces

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Rui Nie,
  • Zhuobiao Li,
  • Wenfu Zeng,
  • Cheng Qian,
  • Yunlong Li

摘要

An electrohydraulic proportional servo hydraulic valve has good intelligent control performance and is the core control component in a hydraulic system. In the working process of an electrohydraulic proportional servo valve, the working principle determines that the spool surface will produce friction wear, which will threaten the safety of the entire hydraulic system when severe. Therefore, in industry, coatings are often applied to the surface of a material to improve its wear resistance. In this study, two diamond-like carbon (DLC) coatings and three nitride coatings were successfully prepared on the surface of a spool material (40cr), and the five coatings were DLC1, DLC2, TiN, CrN, and CrAlN. The microstructures and mechanical and tribological properties of the five coatings were compared. Finally, the effects of the five coatings on the dynamic response characteristics of the servo valve were analyzed using an Amesim simulation. Compared with those of the substrate, the wear rates of the five coatings were reduced by approximately 98%, 98%, 86%, 90%, and 80%. The DLC coatings exhibited better wear resistance than did the nitride coatings.