Enhancing wear resistance of plasma-sprayed NiCr coatings through ZrB2 and Mo dual-phase reinforcement: Microstructure and tribological performance evaluation

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2025-10-13 DOI:10.1016/j.wear.2025.206386

Xudong Nie , Jinyong Xu , Petr Rusinov , Sergi Dosta , Chao Zhang

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引用次数: 0

Abstract

ZrB₂-NiCr and Mo-ZrB₂-NiCr coatings were prepared through atmospheric plasma spraying, and the effects of varying ZrB₂ content as well as the addition of Mo on the microstructure and tribological properties of the coatings were analyzed. Both the hardness and porosity of the coatings increased with the addition of refractory hard phases. The dual-phase reinforced coating achieves its highest hardness of 577.86 HV_0.1 at a ZrB₂ content of 20 wt%. The heat-absorbing protective effect of Mo reduced the formation of oxides within the coating. Friction tests showed that the wear rate of both coatings first decreased and then increased with increasing ZrB₂ content. Coating with 10 wt% ZrB₂ and 5 wt% Mo exhibited optimal wear resistance, with a minimum wear rate of 1.93 × 10⁻⁶ mm³/N·m. Mo reduces friction by forming the laminar structure of MoO₃. It fully spreads out to protect loose debris from being scattered by grinding balls, thereby forming a complete lubricating film on the sliding surface. The wear mechanisms of both coatings are dominated by the hardness and toughness of the materials, transitioning from material removal caused by adhesion and micro-cutting at low hardness to layered fracture caused by brittle interface defects at high hardness.

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通过ZrB2和Mo双相增强等离子喷涂NiCr涂层的耐磨性：显微组织和摩擦学性能评价

采用大气等离子喷涂法制备了ZrB2- nicr和Mo-ZrB2- nicr涂层，分析了ZrB2含量和Mo添加量对涂层组织和摩擦学性能的影响。随着难熔硬相的加入，涂层的硬度和孔隙率均有所提高。当ZrB2含量为20%时，双相增强涂层的硬度最高，达到577.86 HV0.1。Mo的吸热保护作用减少了涂层内氧化物的形成。摩擦试验表明，随着ZrB2含量的增加，两种涂层的磨损率均先降低后升高。ZrB2含量为10 wt%、Mo含量为5 wt%的涂层耐磨性最佳，最小磨损率为1.93 × 10−6 mm3/N·m。Mo通过形成MoO3的层流结构来减少摩擦。充分展开，保护松散杂物不被磨球分散，从而在滑动表面形成完整的润滑膜。两种涂层的磨损机制均由材料的硬度和韧性主导，从低硬度时由粘附和微切削引起的材料去除，过渡到高硬度时由脆性界面缺陷引起的层状断裂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.