Purpose

This paper aims to fabricate nickel-aluminum (Ni-Al)-based self-lubricating composite coating on aluminum (Al) alloy by mechanical milling (MM).

Design/methodology/approach

A new carrier transport (CT) way was designed to solve the slippage fracture of the coating due to silver (Ag) accumulation (Ag powders were cold welded with nickel [Ni] powders by MM in advance to avoid accumulation, then Al powder and samples were added to fabricate the coating).

Findings

Microstructure analysis reveals that the solid lubricant Ag exists as particles in the composite coating via CT technique, which is different from the typical morphology (strip-type) of Ag tailored by normal methods. The unique granular form of Ag can effectively avoid the gliding fracture of the coating, thus forming an efficacious lubrication film on the worn surface, which is responsible for the excellent tribological properties of the coating.

Practical implications

Most of the papers reported that coatings synthesized by MM mainly concentrated on hard coatings, but the fabrication of self-lubricating coatings have not yet reported.

Originality/value

The uniform dispersion of solid lubricant Ag can effectively solves a fatal problem that the fracture failure of coating triggered by the Ag accumulation. This experiment provides a novel method for preparation of self-lubricating coating by MM.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0030

中文翻译：

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机械研磨制备自润滑涂层

目的

本文旨在通过机械铣削（MM）在铝（Al）合金上制备镍铝（Ni-Al）基自润滑复合涂层。

设计/方法/方法

设计了一种新的载流子传输（CT）方式来解决由于银（Ag）积累而导致的涂层滑移断裂（通过MM预先将Ag粉与镍[Ni]粉末冷焊以避免积累，然后是Al粉和样品加入以制造涂层）。

发现

微观结构分析表明，通过CT技术，固体润滑剂Ag以颗粒形式存在于复合涂层中，这与常规方法定制的典型Ag形态（带状）不同。Ag独特的颗粒形式可以有效避免涂层的滑动破裂，从而在磨损的表面上形成有效的润滑膜，这是涂层优异的摩擦学性能的原因。

实际影响

多数论文报道，MM合成的涂层主要集中在硬质涂层上，但自润滑涂层的制造尚未见报道。

创意/价值

固体润滑剂Ag的均匀分散可以有效解决致命问题，即由Ag堆积引起的涂层断裂失效。该实验提供了一种通过MM制备自润滑涂层的新方法。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-01-2020-0030