Strong-bonding self-lubricating nickel-matrix coatings at a wide temperature range

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International Pub Date : 2024-10-22 DOI:10.1016/j.triboint.2024.110345

Jiangxia Liu , Wenyuan Chen , Yushan Geng , Juanjuan Chen , Jun Cheng , Shengyu Zhu , Jun Yang

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Abstract

The weak bond strength that affects self-lubricating coatings across a wide temperature range severely limits their application on the surfaces of high-temperature mechanical parts. To solve this problem, the strong-bonding self-lubricating NiCrAlY-Ag-BaF₂/CaF₂ coatings were produced by detonation spraying. The as-sprayed coatings exhibit high bond strengths of 65 – 75 MPa by controlling the formation of semi-molten state particles and in-situ oxides. The composite coating with 10 wt% fluoride eutectic and 20 wt% Ag shows the favorable tribological properties at a wide temperature range from room temperature to 900 °C. The combined effects, including the formation of the lubricating Ag film, the synergistic lubricating effect of BaF₂/CaF₂ and CaCrO₄ formed by tribo-chemistry at high temperature, tribo-glaze of oxides, and tribo-transfer film, contribute to favorable lubrication at a wide temperature range.

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宽温度范围内的强粘合自润滑镍基涂层

自润滑涂层在宽温度范围内的结合强度较弱，这严重限制了其在高温机械部件表面的应用。为了解决这个问题，我们采用爆轰喷涂技术制备了强粘结自润滑镍铬铝银银钡钒/钙钒涂层。通过控制半熔融态颗粒和原位氧化物的形成，喷涂涂层显示出 65 - 75 兆帕的高粘结强度。含 10 wt%氟化物共晶和 20 wt%银的复合涂层在室温至 900 °C 的宽温度范围内显示出良好的摩擦学特性。润滑银膜的形成、BaF2/CaF2 和 CaCrO4 在高温下通过三相化学反应形成的协同润滑效应、氧化物的三相釉和三相转移膜等综合效应有助于在较宽的温度范围内实现良好的润滑。

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

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.