High-temperature Tribological Performance of Organic-inorganic Hybrid Modified Phosphate/Graphite Lubricating Coatings

doi:10.11901/1005.3093.2024.437

Chinese Journal of Materials Research

2025, Vol. 39

Issue (9): 661-672 DOI: 10.11901/1005.3093.2024.437

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High-temperature Tribological Performance of Organic-inorganic Hybrid Modified Phosphate/Graphite Lubricating Coatings

ZHANG Ruoyun¹, WANG Wei¹(

), GONG Penghui², DING Shijie¹, LIU Xianhao¹, SUN Zhuang¹, LV Fanfan¹, GAO Yuan¹, WANG Kuaishe¹

^1.School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
^2.School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Cite this article:

ZHANG Ruoyun, WANG Wei, GONG Penghui, DING Shijie, LIU Xianhao, SUN Zhuang, LV Fanfan, GAO Yuan, WANG Kuaishe. High-temperature Tribological Performance of Organic-inorganic Hybrid Modified Phosphate/Graphite Lubricating Coatings. Chinese Journal of Materials Research, 2025, 39(9): 661-672.

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Abstract

The phosphoric acid dihydrogen aluminum (AP) was modified by in situ organic-inorganic hybridization technique, and then the graphite-based lubrication coatings were applied on TA1 pure titanium surfaces by taking AP and hybridized AP as binding agent respectively. The prepared hybridized AP was characterized by means of infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The high-temperature tribological performance of different coatings was assessed via RTEC MFT-5000 multifunctional friction and wear tester at 700 ^oC to 900 ^oC, which then were characterized by means of scanning electron microscopy and three-dimensional white light contour interferometry. The results indicated that AP was successfully hybridized with phenyltrimethoxysilane (PTMS), forming a chemical structure with P-O-Si as the skeleton. The coating with hybridized AP exhibited optimal lubrication performance at high temperatures when the PTMS content was 10%. Specifically, by tribological test at 850 ^oC, the coating with hybridized AP presented coefficient of friction 0.1219 and wear rate 0.57 × 10^-3 mm³·N^-1·m^-1, which were reduced by 77% and 82%, respectively, compared to those with simple AP. It follows that the reticulated material generated in the hybridized AP binder can enhanced the high-temperature tribological properties of the lubricated coatings containing laminated graphite. Furthermore, this reticulated material can fill the holes and cracks within the coating, thereby reducing the wear rate and improving wear resistance of coatings.

Key words: composite graphite high-temperature solid lubricant coating tribological properties lubrication mechanism

Received: 25 October 2024

ZTFLH:

TB332

Fund: National Natural Science Foundation of China(51975450);Youth Science and Technology New Star Project of Shaanxi Province Innovation Ability Support Plan(2021KJXX-32);Advanced Technology Research Program of Xi'an(21XJZZ0031);Service Local Special Projects of Shaanxi Provincial Education Department(22JC047);National Natural Science Foundation of China(52305438);Key Research and Development Projects of Shaanxi Province(2023-YBGY-383);Key Research and Development Projects of Shaanxi Province(2023GXLH-063)

Corresponding Authors: WANG Wei, Tel: 13609264618, E-mail: gackmol@163.com

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	Articles by authors
	ZHANG Ruoyun
	WANG Wei
	GONG Penghui
	DING Shijie
	LIU Xianhao
	SUN Zhuang
	LV Fanfan
	GAO Yuan
	WANG Kuaishe

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2024.437 OR https://www.cjmr.org/EN/Y2025/V39/I9/661

Fig.1 Schematic diagram of the coating preparation process

Fig.2 Chemical structure characterization of hybrid AP binder (a) FT-IR, (b) XPS, (c) XRD, (d) Hybridization synthesis pathway

Fig.3 SEM images of AP coating (a-d) and hybridized AP coating (e-h) at RT (a, e), 700 ^oC (b, f), 800 ^oC (c, g) and 900 ^oC (d, h)

Table 1 Point scanning results of coating surfaces (mass fraction, %)

Fig.4 Friction curves (a), average friction coefficient and wear rate (b) of AP bonded coating at different temperatures

Fig.5 Wear mark surfaces of TA1 discs at different temperatures for AP-bonded coatings were analyzed using wear tracks (a-e), 3D contour maps (a1-e1), and 2D height profile curves (a2-e2)

Fig.6 SEM and EDS of AP-coated TA1 disc wear mark surfaces (a, b) and wear chips (c) at 850 ^oC

Fig.7 Friction curves (a), average friction coefficient and wear rate (b) of coatings with different PTMS contents at 800 °C

Fig.8 Friction curves (a), average friction coefficient (b), and wear rate (c) of 10% hybrid AP as a binder at different temperatures

Fig.9 Wear trace surfaces of 10% hybrid AP bond-coated TA1 discs at different temperatures were analysed using wear traces (a-e), 3D contour plots (a1-e1) and 2D height profile curves (a2-e2)

Fig.10 Wear trace surfaces of 10% hybrid AP bond-coated Si₃N₄ ball at different temperatures were analysed using wear traces (a-e), 3D contour plots (a1-e1) and 2D height profile curves (a2-e2)

Fig.11 SEM and EDS patterns of 10% hybrid AP bonded coatings at 850 °C for TA1 disc wear marks (a, b), abrasive chips (c)

Fig.12 XRD patterns of 10% hybridized AP bonded coating at 850 and 900 ^oC

Fig.13 XPS mapping of 10% hybrid AP bonded coating at 850 °C at TA1 disc wear marks (a) O 1s, (b) C 1s, (c) Al 2p, (d) P 2p, (e) Si 2p, (f) Ti 2p

Fig.14 Organic-inorganic hybrid AP binder lubrication mechanism diagram

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