Effect of pore structure on mechanical and tribological properties of paper-based friction materials

Li, Chang; Fu, Yewei; Wang, Beibei; Zhang, Wenhao; Bai, Yuhang; Zhang, Leilei; Qi, Lehua

doi:10.1016/j.triboint.2020.106307

Cited by 27 publications

(20 citation statements)

References 17 publications

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“…Generally, there are two significant factors in fabricating a superhydrophobic surface: the appropriate hierarchical structure with durable micro/nanoparticles and a low surface energy 66 . More importantly, the cellulosic paper itself has micro‐structured surface and small pores, 67 resulting a superhydrophobic surface after being modified by stearic acid with low surface energy. For the two different fabric substrates, the WCA of the fine fabric before immersing is 0°, but the WCA of the coarse fabric is 114°, which is maybe due to the surface of the fine fabric has regular small holes (Figure S2), and water droplets can penetrate quickly 68 .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of the superhydrophobic natural cellulosic paper with different wettability and oil/water separation application

Yun

Tong

Wang

et al. 2020

J of Applied Polymer Sci

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Renewable superhydrophobic materials have attracted great attention due to their extensive applications in the fields such as cost‐effective and biodegradable oil/water separation field. Herein, we reported an eco‐friendly and facile methodology to develop the superhydrophobic cellulosic paper by immersion method using the ethanol solution of stearic acid. Furthermore, the treated cellulosic papers showed super‐hydrophobicity with water contact angle (WCA) above 153°. Interestingly, this method can realize superhydrophobic‐hydrophilic conversion by simply adjusting the temperature and is amenable for different substrates and with the WCA of 114‐162°. More importantly, the utilization of fluorinated reagents has been avoided, thereby minimizing the production cost and improving safety and environmental aspects. Meanwhile, the modified natural cellulosic paper is applied for oil–water separation, and its separation efficiency was as high as 95% after 10 cycles, indicating the good reusability of stearic acid modified filter papers. Consequently, this simple strategy based on the stearic acid immersion method thus provided an easy conversion of superhydrophobic‐hydrophilic interface and provided facile strategies for conversion of commercial quantitative filter paper to functional materials for oil/water separation.

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Section: Resultsmentioning

confidence: 99%

Fabrication of the superhydrophobic natural cellulosic paper with different wettability and oil/water separation application

Yun

Tong

Wang

et al. 2020

J of Applied Polymer Sci

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“…A large number of small molecules are released by polycondensation reactions during the curing process of PF, which escape in the form of gas resulting high pore diameter. [21] However, polyimide resin has high viscosity and poor fluidity and there is no small molecular volatile during curing since the PI undergoes additional polymerization reactions during the curing process. High viscosity is not conducive to the growth, merging, and overflow of pores, making the pore diameter smaller.…”

Section: Structure Of the Compositesmentioning

confidence: 99%

Significant improvement of thermal and tribological performance with polyimide as the matrix of paper‐based friction materials

Tian

Fei

et al. 2022

Polymer Composites

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Paper‐based friction materials with phenolic resin as the matrix are prone to thermal damage under harsh working conditions easily leading to materials failure. To satisfy the requirements of high speed and heavy load service situations, paper‐based friction materials with different polyimide resin content were prepared by wet forming technology to reveal the effect of polyimide resin on the properties of composites. And a paper‐based composite with phenolic resin was used for comparison. Results show that compared with the phenolic composite, tensile strength, and shear strength of the polyimide composite were increased by 50.5% and 36.4%, respectively. Due to the strong hydrogen bond in the imide ring of polyimide, the temperature of the polyimide composite at 2% weight loss was 292.7°C, which was 106.3°C higher than that of the phenolic composite. Moreover, the wear rate was reduced by 30.3% because the friction transfer film was produced during friction. To sum up, polyimide resin has the potential to replace phenolic resin under the condition of high speed and heavy load. Besides, the composite with polyimide resin content of 40.0 wt% demonstrated the best wear resistance and considerable strength attributed to the best interface combination. This research lays a theoretical foundation for the application of polyimide resin to paper‐based friction materials.

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“…is the effective Young's modulus [48]) were then calculated based on the obtained H and E, as shown in Fig. 2(b).…”

Section: Sliding Wear Performancementioning

confidence: 99%

High-temperature wear mechanisms of TiNbWN films: Role of nanocrystalline oxides formation

Chen

Zhang

et al. 2022

Friction

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Refractory high/medium entropy nitrides (HENs/MENs) exhibit comprehensive application prospects as protective films on mechanical parts, particularly those subjected to sliding contacts at elevated temperatures. In this study, a new MEN system TiNbWN, forming a single fcc solution, is designed and its wear performance at temperatures ranging from 25 to 750 °C is explored. The wear mechanisms can be rationalized by examining the subsurface microstructural evolutions using the transmission electron microscopy as well as calculating the phase diagrams and interfacial adhesion behavior employing calculation of phase diagram (CALPHAD) and density functional theory (DFT). To be specific, increased wear losses occur in a temperature range of 25–600 °C, being predominantly caused by the thermally-induced hardness degradation; whereas at the ultimate temperature (750 °C), the wear loss is refrained due to the formation of nanocrystalline oxides (WnO3n−2, TiO2, and γTiOx), as synergistically revealed by microscopy and CALPHAD, which not only enhance the mechanical properties of the pristine nitride film, but also act as solid lubricants, reducing the interfacial adhesion. Thus, our work delineates the role of the in situ formed nanocrystalline oxides in the wear mechanism transition of TiNbWN thin films, which could shed light on the high-temperature wear behavior of refractory HEN/MEN films.

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Effect of pore structure on mechanical and tribological properties of paper-based friction materials

Cited by 27 publications

References 17 publications

Fabrication of the superhydrophobic natural cellulosic paper with different wettability and oil/water separation application

Fabrication of the superhydrophobic natural cellulosic paper with different wettability and oil/water separation application

Significant improvement of thermal and tribological performance with polyimide as the matrix of paper‐based friction materials

High-temperature wear mechanisms of TiNbWN films: Role of nanocrystalline oxides formation

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