2D Mo<sub>2</sub>CT<sub>x</sub> Reinforced Polyimide Nanocomposites for Enhancement of Surface Tribological Performance at Elevated Temperatures

Li, Haonan; Wang, Libo; Li, Liang; Han, Li; Dai, Yahui; Hu, Qianku; Zhou, Aiguo; Liu, Xuqing

doi:10.1002/admi.202201563

Adv Materials Inter

2023

DOI: 10.1002/admi.202201563

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2D Mo₂CT_x Reinforced Polyimide Nanocomposites for Enhancement of Surface Tribological Performance at Elevated Temperatures

Haonan Li

Libo Wang

Liang Li

et al.

Abstract: In order to improve the high‐temperature friction and wear properties of polyimide (PI), Mo2CTx/PI nanocomposite materials are prepared by using 2D Mo2CTx MXene as reinforcement. Compared with the properties of pure PI, Mo2CTx/PI nanocomposites exhibit significant improvement on thermal stability, hardness, and tribological performance. Especially, the addition of Mo2CTx can reduce friction coefficient and wear rate of PI significantly at different temperatures ranging from room temperature (RT) to 200 °C. The… Show more

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Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Yan,

Du,

et al. 2024

ACS Appl. Polym. Mater.

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The design and development of self-lubricating materials can reduce friction and wear in industrial activities to satisfy higher demands for environmental sustainability. Silica nanoparticles, as a representative of inorganic nanomaterials, have the advantages of low thermal expansion coefficient, large specific surface area and pore volume, adjustable particle size, and easy functionalization. When used to modify single-component polymer materials, silica materials can effectively improve the wear resistance performance of polymer substrates by enhancing their mechanical properties. However, the enhancement of self-lubricating properties of polymers by silica materials is less effective than that achieved by liquid lubricants. In this paper, liquid lubricants such as dimethyl silicone oil (DSO) and perfluoropolyether lubricating oil (PFPE) were loaded using mesoporous silica nanoparticles (MSNs), and the oil content was about 24 and 48 wt %, respectively. The oil-loaded MSNs (MSNs-DSO or MSNs-PFPE) were filled into a polyoxymethylene (POM) matrix, and a POM-based composite with self-lubricating properties was prepared by a hot pressing process. The materials were tested and analyzed by a thermogravimetric analyzer, a Fourier infrared analyzer, a scanning electron microscope, a three-dimensional profile analyzer, a multifunctional friction and wear tester, a universal material testing machine, and an X-ray photoelectron spectroscopy analyzer. Compared to pure POM, the coefficient of friction and wear rate of POM-based composites containing 5 wt % MSNs-DSO were reduced by 75.3% and 69.2%, respectively. During the friction process, the lubricant components in the composite are released from the POM matrix under load and friction heat to migrate toward the friction interface, forming a corresponding transfer tribofilm that avoids direct contact between the POM matrix and the friction counterpart so that the material has excellent self-lubricating properties.

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Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Yan,

Du,

et al. 2024

ACS Appl. Polym. Mater.

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Microstructure and wear resistance of cold sprayed CoCrFeNi HEA coatings: Influence of powder particle size and spraying temperature

Chai,

Jiang,

Zhang

et al. 2024

Surface Engineering

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This study focuses on the successful fabrication of three distinct types of CoCrFeNi high entropy alloy (HEA) coatings through cold spray (CS) technology, with an emphasis on analyzing the impact of varying crucial CS parameters (spraying temperature and the range of powder particle size), on the coating's microstructure and tribological properties. Contrasted with conventional thermal spraying techniques, lower operational temperature in CS safeguards the materials from undergoing oxidation or phase transitions that are typically induced by high-temperature conditions. Additionally, the high-velocity impact of particles onto the substrate within CS process triggers plastic deformation, resulting in the creation of coatings that are characterized by heightened hardness, and greater density. Such coatings exhibit significantly enhanced performance and durability. The cocktail effect observed in CoCrFeNi HEA is reflected in a suite of exceptional properties that markedly surpass those exhibited by traditional alloys. Chiefly, this phenomenon is manifested through the alloy's exceptionally high hardness and dense structure, positioning CoCrFeNi HEA as a promising candidate for applications in high-wear scenarios. Experimental outcomes indicate that when smaller powder particles and higher spraying temperatures are employed, the porosity of CSed CoCrFeNi HEA coatings was observed to decrease by nearly an order of magnitude, concomitant with a 22.46% enhancement in microhardness. This improvement in microhardness translates into a significant reduction of over 72% in the wear rate, underscoring the positive correlation between enhanced microstructural integrity and wear resistance properties. By meticulously tuning spraying temperature and powder particle size, the resulting microstructure can be rendered increasingly dense and refined.

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2D Mo₂CT_x Reinforced Polyimide Nanocomposites for Enhancement of Surface Tribological Performance at Elevated Temperatures

Cited by 2 publications

References 66 publications

Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Microstructure and wear resistance of cold sprayed CoCrFeNi HEA coatings: Influence of powder particle size and spraying temperature

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2D Mo2CTx Reinforced Polyimide Nanocomposites for Enhancement of Surface Tribological Performance at Elevated Temperatures

Cited by 2 publications

References 66 publications

Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Synthesis and Tribology Properties of Self-Lubricating Polyformaldehyde with Oil-Loaded Mesoporous Silica

Microstructure and wear resistance of cold sprayed CoCrFeNi HEA coatings: Influence of powder particle size and spraying temperature

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Product

Resources

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2D Mo₂CT_x Reinforced Polyimide Nanocomposites for Enhancement of Surface Tribological Performance at Elevated Temperatures