Coupled Temperature-Oil/Water Ratio Effects on Tribo-Chemical Reactions and Failure Behavior of Polycrystalline Diamond.

Di Xu, Dingshun She, Shaorong Bie, Yujie Guo, Ren Wang, Haibo Liang, Yi Pan

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Article in Materials (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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7 authors.

Di XuState Key Laboratory of Deep Earth Exploration and Imaging, School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.

Dingshun SheState Key Laboratory of Deep Earth Exploration and Imaging, School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.

Shaorong BieState Key Laboratory of Deep Earth Exploration and Imaging, School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.

Yujie GuoState Key Laboratory of Deep Earth Exploration and Imaging, School of Engineering and Technology, China University of Geosciences, Beijing 100083, China.

Ren WangCNPC Engineering Technology Research Institute Co., Ltd., Beijing 102206, China.

Haibo LiangSchool of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China.

Yi PanNational Institute of Measurement and Testing Technology, Chengdu 610021, China.ORCID 0000-0002-9762-6899

Funding

National Key Research and Development Enterprise Supporting Projects 2024DQ0537National Key Research and Development Project 2023YFF0611102Natural Science Foundation of Henan Province 232300421104

6 · The paper itself

Abstract

Polycrystalline diamond (PCD) compacts are extensively applied in downhole drilling tools owing to their exceptional hardness and wear resistance. However, their tribological performance is strongly influenced by the thermal and chemical characteristics of drilling fluids. In this study, the coupled effects of temperature (25-125 °C) and oil-water ratio on the tribological behavior of PCD were systematically investigated. The results indicate that under relatively high oil-water ratios (50:50, 80:20, and 100:0), both the friction coefficient and wear rate increase monotonically with temperature, which is associated with intensified interfacial thermal stress and suppressed formation of protective carbon-based transfer films. In contrast, at low oil-water ratios (0:100 and 20:80), the friction coefficient exhibits a non-monotonic dependence on temperature, decreasing initially and then increasing with a transition near 100 °C. This behavior is attributed to temperature-activated surface passivation through C-OH bond formation in water-rich environments, followed by the deterioration of passivation due to water evaporation at elevated temperatures. These findings provide insight into temperature-dependent lubrication regime transitions and tribo-chemical evolution of PCD in complex drilling fluid environments.

Indexed as

drilling fluidsoil–water ratiopolycrystalline diamondtribological performances

Identifiers

PMID41828248

DOI10.3390/ma19050982

PMCPMC12985635

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.