Molecule-dependent abnormal wear of GCr15 ball-ball contact: Morphological, chemical, and structural characterization

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Wear Pub Date : 2025-03-15 Epub Date: 2025-01-06 DOI:10.1016/j.wear.2024.205723

Huajie Tang , Xinchun Chen , Chunhui Zhao , Daoxin Su , Jinshan Pan , Jianlin Sun

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Abstract

Abnormal wear has always been a common concern in engineering lubrication, which sometimes depends on the lubrication. The present work aimed to elucidate the formation mechanism of abnormal non-circular wear scar of GCr15 ball-ball contact in the presence of dibutyl phosphite (DBPI). A detailed characterization of morphology, composition, and structure was performed. The results show that the abnormal wear depended on the chemical reactivity of DBPI, structure and size of wear products. Importantly, wear products exhibited a flocculent structure at the macroscale and had a capsule structure with metal debris encapsulated into an amorphous shell at the microscale. The redeposition of wear products formed a multilayered tribofilm, containing a metal-debris-dominated layer and multiple organic-dominated amorphous layers. The total thickness of tribofilm can be up to 268 nm. Fe₃(PO_x)₂, FePO_x, Fe[DBPI]₂, and Fe[DBPI]₃ were the principal composition of tribofilm. The present work elucidates the molecule-dependent abnormal wear of ball-ball contact, which will have wide potential for the additives design and the corresponding lubrication mechanism research.

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GCr15球-球接触的分子依赖性异常磨损：形态、化学和结构表征

异常磨损一直是工程润滑中普遍关注的问题，有时也依赖于润滑。本工作旨在阐明GCr15球球接触在亚磷酸二丁酯（DBPI）存在下异常非圆形磨损疤痕的形成机制。对其形态、组成和结构进行了详细的表征。结果表明，异常磨损与DBPI的化学反应活性、磨损产物的结构和尺寸有关。重要的是，磨损产品在宏观尺度上呈现絮状结构，在微观尺度上具有金属碎片封装在无定形外壳中的胶囊结构。磨损产物的再沉积形成多层摩擦膜，包含以金属碎屑为主的摩擦层和以有机为主的非晶态摩擦层。摩擦膜的总厚度可达268 nm。Fe3(POx)2、FePOx、Fe[DBPI]2和Fe[DBPI]3是摩擦膜的主要成分。本研究阐明了球-球接触的分子依赖性异常磨损，对添加剂的设计和相应的润滑机理研究具有广阔的应用前景。

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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.