Purpose

The purpose of this paper is to improve the tribological properties of aluminum cylinder liner. Higher martensite contents were closely related to the higher hardness and excellent wear resistance of Fe-based coatings. Furthermore, the grain size of the Fe-based coating was approximately 40 nm, which provides an excellent fine grain strengthening effect.

Design/methodology/approach

To improve the tribological properties of aluminum cylinder liners, a Fe-based martensite coating was prepared by internal plasma spraying technology, whose microstructure and tribological properties were then investigated.

Findings

Sprayed Fe-based coating possessed a low contact angle and strong adhesion with lubricating oil. In a simulated engine condition, Fe-based coating exhibited a decreased friction coefficient and increased wear resistance under oil lubrication, which was dominated by a stronger adhesive force with lubricating oil, higher martensite contents on the worn surface, higher hardness and higher H/E value than those of the reference HT 200 and Al-19Si cylinder material.

Originality/value

Nanostructure Fe-based martensite coating was sprayed on an aluminum cylinder liner, which demonstrated remarkable advantages over the reference cylinder material.

中文翻译：

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铝缸套喷涂纳米铁基马氏体涂层的显微组织和摩擦学性能

目的

本文的目的是提高铝制气缸套的摩擦学性能。较高的马氏体含量与铁基涂层较高的硬度和优异的耐磨性密切相关。此外，铁基涂层的晶粒尺寸约为 40 nm，提供了极好的细晶粒强化效果。

设计/方法/方法

为改善铝缸套的摩擦学性能，采用内等离子喷涂技术制备了铁基马氏体涂层，并对其微观结构和摩擦学性能进行了研究。

发现

喷涂的铁基涂层接触角小，与润滑油的附着力强。在模拟发动机工况下，Fe基涂层在油润滑下表现出降低的摩擦系数和增加的耐磨性，主要是与润滑油的结合力更强，磨损表面马氏体含量更高，硬度更高，H/E更高值高于参考 HT 200 和 Al-19Si 气缸材料的值。

原创性/价值

纳米结构铁基马氏体涂层喷涂在铝制气缸套上，与参考气缸材料相比具有显着优势。