Article
Engineering, Mechanical
Jinming Zhen, Jun Cheng, Hui Tan, Qichun Sun, Shengyu Zhu, Jun Yang, Weimin Liu
Summary: This study investigated the vacuum tribological behaviors of nickel-matrix/Ag/(Ca, Ba)F2/graphite composites, and found that the addition of 2 wt% graphite significantly improved the frictional properties and reduced the wear rate over the entire testing temperature range in vacuum. The synergistic effects of solid lubricants were believed to contribute to the enhanced tribological properties of the composites.
Article
Materials Science, Coatings & Films
R. Kumar, H. Torres, S. Aydinyan, M. Antonov, M. Varga, M. Rodriguez Ripoll, I. Hussainova
Summary: It is well established that titanium and its alloys have poor tribological performance at high temperatures, especially for self-mated titanium-titanium pairs. Previous work has shown that incorporating a TiB2 ceramic lubricant can significantly improve the mechanical and high temperature tribological behavior of pure titanium. This current study explores the possibility of extending the lubrication temperature range of Ti-TiB2 composites through the addition of a Ni-Bi solid lubricant using laser melting. The study found that the self-lubricating Ni-Bi samples exhibited a unique microstructure featuring a hard B-rich phase inside a lubricous Bi-rich phase, resulting in a two-fold increase in surface hardness compared to the underlying substrate. Additionally, the Ni-Bi samples demonstrated a significant decrease in coefficient of friction and wear rate when sliding against a Ti-alloy counterbody at temperatures of 400°C and 600°C due to the formation of a self-lubricating tribo-oxide layer rich in Bi-compounds. These findings are compared to the unmodified reference Ti-TiB2 composite.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Enkang Hao, Yijing Wang, Xiaoqin Zhao, Meizhen Gao, Jianmin Chen, Yulong An, Fengyuan Yan
Summary: The NiCoCrAlYTa/10Ag/5Mo self-adaptive lubricating composite coating exhibits good performance in hot corrosion and high-temperature tribological behaviors. The presence of beta-Ag2MoO4 on the surface acts as a lubricant film during friction and enhances wear resistance. Exposure to molten salt mixtures accelerates the oxidizing process but improves mechanical properties.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Zhiming Chen, Hengzhong Fan, Hui Tan, Wenyuan Chen, Shengyu Zhu, Jun Cheng, Yongsheng Zhang, Jun Yang
Summary: This paper investigates the fabrication of Cu-Ni-Al/Gr solid-lubricating composites with 2.5-10 wt% graphite for high temperature applications. The effects of graphite contents on tribological behavior from room temperature to 500°C were thoroughly examined. The results indicate that the addition of graphite significantly improves tribological properties, but no further enhancement is observed when graphite reaches 7.5-10 wt%. The excellent tribological performance at 25-500°C is attributed to the synergistic effects of self-lubrication provided by graphite lubricant and the tribo-oxide layer formed during sliding.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Yushan Geng, Jun Cheng, Hui Tan, Qichun Sun, Juanjuan Chen, Shengyu Zhu, Anh Kiet Tieu, Jun Yang, Weimin Liu
Summary: High-entropy alloy matrix solid-lubricating composites with coupled high-entropy phases as the matrix material show excellent anti-wear and friction-reduced properties. The synergistic Ag-BaF2/CaF2 lubricating films eliminate stress concentration and suppress abrasion and roughening. The high-entropy composite tribo-layers provide strong stress shielding and avoid oxidative and adhesive wear. Developing similar coupled high-entropy matrix phases can further optimize the tribological properties of the composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Hong Zhang, Rui Zhang, Xiaoyu Zhao, Xindong Li, Botong Chen, Yuhong Li, Peng Wang
Summary: The representative FCC structured NiCr(MoNb)x-Ag (x = 0, 0.65 and 1.05) composite films were developed and studied for their microstructure, mechanical, and tribological properties. It was found that small amounts of nm-sized Ag particles are dispersed in the thin film matrix. The NiCr(MoNb)1.05-Ag composite film showed the best tribological performance with low friction coefficients at high temperatures.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Cuong Nguyen, Anh Kiet Tieu, Guanyu Deng, David Wexler, Tri Dinh Vo, Long Wang, Jun Yang
Summary: A cost-effective self-lubricating composite material based on CrFeNiAl0.3Ti0.3 as the matrix and Ag as the solid lubricant has been fabricated. Tribological tests show that the presence of Ag tribo-film reduces the coefficient of friction and wear of the composites from room temperature to 600 degrees C. The wear mechanism changes from abrasive to oxidative wear at 750 degrees C.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Electrochemistry
Amit Kumar, Manoj Kumar, Satish Tailor
Summary: The tribological behavior of HVOF sprayed Ni-based self-lubricating composite coatings on cast iron substrate was studied in this investigation. Four different combinations of coatings materials were deposited on a cast iron substrate and their mechanical, morphological, and tribological properties were analyzed. Results showed that the Ni-10MoS(2)-10Al-10graphite coated cast iron sample exhibited the highest microhardness and the lowest average wear rate among all coatings.
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
(2023)
Article
Materials Science, Coatings & Films
Rohit Kumar Singh Gautam, Rajnesh Tyagi, Sudesh Singh, Saood Ali, Sanjeev Kumar, Hemant Nautiyal
Summary: The tribological behavior of Ni-Al-Ag-MoS2 coatings with varying wt% of h-BN was assessed. The coating with 7.5 wt% h-BN showed the best tribological behavior under different testing loads.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Tzu-Chia Wang, Sheng-Yu Hsu, Yuan-Tai Lai, Su-Yueh Tsai, Jenq-Gong Duh
Summary: In recent years, self-lubricating hard protective coatings operated at elevated temperature have gained significant attention. Alloying certain elements, such as vanadium, has been found to effectively reduce friction coefficient by forming the Magne acute accent li phase with self-lubricious properties. This study presents an architectural design strategy for TiAlSiN/VSiN multilayer coating to enhance its mechanical and high temperature tribological properties.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Coatings & Films
Peiying Shi, Wenzhen Wang, Shanhong Wan, Qiang Gao, Huwei Sun, Xiaochun Feng, Gewen Yi, Erqing Xie, Qihua Wang
Summary: This study investigates the mechanical, tribological performance, and high temperature oxidation behavior of Ni- and NiCrAlY-based composite coatings with TiO2/ZnO. The results show that the tribological performance of the coatings is improved by the addition of TiO2/ZnO, particularly with NiCrAlY-based coatings exhibiting the lowest friction coefficient and wear rate at 800 degrees Celsius. The high-temperature oxidation experiments reveal that ZnO diffuses to the surface of the coating with increasing temperature, and the diffusion behavior can be influenced by the metal matrix of the coatings.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Juanjuan Chen, Qichun Sun, Jiao Chen, Jun Cheng, Shengyu Zhu, Jun Yang
Summary: h-BN/ZrO2/SiC solid-lubricating ceramic composites were prepared by spark plasma sintering method. The mechanical properties declined with increasing h-BN content, while the friction coefficient decreased at both room temperature and 900 degrees C. The tribological properties were found to improve, but the main wear mode was considered to be surface brittle fracture, especially at 900 degrees C for composites with higher h-BN content.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xiaoni Yan, Wei Yang, Yingxiang Zhao, Wen Deng, Junwen Shi, Junde Guo
Summary: High-temperature self-lubricating Fe-Mo-Ni-Cu-graphite materials with varying copper contents were prepared using powder metallurgy technology. The influence of copper content on the tribological properties of the iron-based material was investigated. The results showed that increasing copper content led to a decrease in friction coefficient and wear rate, resulting in improved wear resistance. The formation of a lubricating composite film on the material's surface played a crucial role in providing excellent high-temperature anti-friction properties.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Engineering, Mechanical
Juanjuan Chen, Qichun Sun, Wenyuan Chen, Shengyu Zhu, Wensheng Li, Jun Cheng, Jun Yang
Summary: The ZrO2/h-BN/SiC composite exhibited outstanding lubricating properties under vacuum conditions, but h-BN was detrimental to wear resistance at high temperatures. The lubricating and wear mechanisms were found to be closely related to the environmental atmosphere and temperature.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Yanjun Chen, Haichao Li, Fenghua Su, Guozheng Ma, Qiang Li, Jianfang Sun, Songsheng Lin
Summary: MoS2/a-C:Si composite films doped with carbon and silicon elements were prepared using a hybrid deposition system. The films exhibited excellent tribological properties in both high-temperature air and vacuum environments.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Zhiming Chen, Hengzhong Fan, Hui Tan, Wenyuan Chen, Shengyu Zhu, Jun Cheng, Yongsheng Zhang, Jun Yang
Summary: This paper investigates the fabrication of Cu-Ni-Al/Gr solid-lubricating composites with 2.5-10 wt% graphite for high temperature applications. The effects of graphite contents on tribological behavior from room temperature to 500°C were thoroughly examined. The results indicate that the addition of graphite significantly improves tribological properties, but no further enhancement is observed when graphite reaches 7.5-10 wt%. The excellent tribological performance at 25-500°C is attributed to the synergistic effects of self-lubrication provided by graphite lubricant and the tribo-oxide layer formed during sliding.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Hui Tan, Qichun Sun, Juanjuan Chen, Shengyu Zhu, Jun Cheng, Jun Yang
Summary: This study systematically investigated the dry sliding tribological properties of Mo-Si-B-xTi (x = 10, 20 and 30 wt%) alloys at different temperatures. It was found that the tribological properties of the alloys are greatly affected by the test temperature and Ti content. The Ti30 alloy exhibited excellent wear resistance at 600-1000 degrees C due to the formation of a dense tribo-oxides layer, and showed a low friction coefficient of 0.31 at 800 degrees C due to the formation of a self-lubricating tribolayer.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Physics, Applied
Peng Zhang, Han Jia, Yuzhen Yang, Jien Wu, Jun Yang
Summary: This study proposes a one-dimensional piezoelectric topological phononic crystal (PTPC) with electrically tunable working frequency by introducing an external capacitor circuit. By appropriately tuning the capacitances to actively control the bandgap frequency, heterostructured PTPCs with high-energy-capacity ETIMs and electrically tunable working frequency range and bandwidth are constructed. This work paves the way for wide engineering applications in acoustic sensing enhancement, nondestructive testing, energy harvesting, information processing, and reconfigurable topological wave transports.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Qichun Sun, Leilei Chen, Jun Cheng, Shengyu Zhu, Hui Tan, Wenyuan Chen, Keke Chang, Jun Yang, Weimin Liu
Summary: We have developed a single-phase ceramic material with excellent self-lubricity, achieving a friction coefficient as low as 0.1 at temperatures of 200-400 degrees C in a vacuum environment. The self-lubricity is attributed to the decomposition of the (Hf-Mo-Nb-Ta-Ti)C ceramic, resulting in the formation of an amorphous carbon film at the sliding interfaces, as well as the diffusion of carbon atoms enabled by high-temperature tribo-induced effect. Based on our experimental and theoretical findings, we propose a novel design strategy for single-phase self-lubricating ceramics by in-situ formation of a lubricating phase.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Coatings & Films
Rongzhen Xiao, Minglei Sun, Jun Cheng, Jie Guo, Juanjuan Chen, Jiao Chen, Shengyu Zhu, Jun Yang
Summary: In this study, the Al2O3 coating was prepared on stainless steel surface using a detonation gun spraying technique. The high-temperature tribological properties of the Al2O3 coating in FLiNaK molten salt were systematically studied by sliding it against SiC, Al2O3, and steel materials. The results showed that the Al2O3 coating has a high bonding strength and its tribological properties are significantly influenced by the counterface materials.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Qichun Sun, Wenyuan Chen, Shengyu Zhu, Jun Cheng, Hui Tan, Juanjuan Chen, Jie Guo, Jun Yang
Summary: In this study, (Hf0.2Mo0.2Nb0.2Ta0.2Ti0.2)C high-entropy ceramics with excellent mechanical and tribological properties were prepared at low temperature by using a mixture with Aluminum. The addition of Aluminum reduced the sintering temperature by 150 degrees C and improved the microhardness of the samples. Furthermore, the wear resistance was enhanced and the wear rate was significantly reduced by the formation of Al2O3 tribo-films.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Tri Dinh Vo, Anh Kiet Tieu, David Wexler, Lihong Su, Cuong Nguyen, Jun Yang, Guanyu Deng
Summary: A comparison study was conducted on the microstructure, mechanical properties and high temperature tribological performance of as-cast Al0.8CrFeNi2.2 and AlCoCrFeNi2.1 eutectic high entropy alloys. The cost-effective Al0.8CrFeNi2.2 exhibited higher hardness and tensile strength compared to AlCoCrFeNi2.1. While AlCoCrFeNi2.1 showed better friction and wear performance at room temperature, the opposite trend was observed at temperatures exceeding 300°C. The higher Ni content in FCC and BCC(B2) phases of Al0.8CrFeNi2.2 increased the hardness of constituent phases. The tribolayers of Al0.8CrFeNi2.2 at 900°C consisted of a distinct oxide layer and ultrafine-grained particle layer, which differed from the mixing pattern in AlCoCrFeNi2.1. A thicker tribolayer was also found to enhance the high temperature tribological properties of Al0.8CrFeNi2.2.
TRIBOLOGY INTERNATIONAL
(2023)
Review
Chemistry, Multidisciplinary
Xianmei Chen, Lei Meng, Zibo Liu, Feiran Yang, Xin Jiang, Jun Yang
Summary: Rapid advancements in underwater vehicle technology have created a higher demand for sound absorption materials that can withstand the unique underwater conditions. Developing innovative composite materials with multifunctional properties, such as high hydrostatic pressure resistance and corrosion prevention, presents challenges for researchers. This comprehensive review provides an in-depth analysis of the mechanisms governing underwater sound absorption and explores potential solutions and challenges for multifunctional integrated sound-absorbing materials. It serves as a valuable resource for future research in underwater vehicle technology development and optimization.
APPLIED SCIENCES-BASEL
(2023)
Editorial Material
Multidisciplinary Sciences
Peng Zhang, Han Jia, Jiuyang Lu, Xinghang Yang, Suhao Wang, Yuzhen Yang, Zhengyou Liu, Jun Yang
Article
Materials Science, Multidisciplinary
Sebastian Lehmann, Fanny Mitzscherling, Shiyang He, Jun Yang, Martin Hantusch, Kornelius Nielsch, Amin Bahrami
Summary: In this study, a water-free atomic layer deposition (ALD) process was used to deposit SbOx on the surface of Bi2Te3 particles for the first time. The coating improved the thermoelectric properties through interface engineering. The results showed that the ALD coating enhanced the electrical conductivity and Seebeck coefficient of the thermoelectric material.
Article
Materials Science, Multidisciplinary
Yushan Geng, Jun Cheng, Hui Tan, Qichun Sun, Juanjuan Chen, Shengyu Zhu, Anh Kiet Tieu, Jun Yang, Weimin Liu
Summary: High-entropy alloy matrix solid-lubricating composites with coupled high-entropy phases as the matrix material show excellent anti-wear and friction-reduced properties. The synergistic Ag-BaF2/CaF2 lubricating films eliminate stress concentration and suppress abrasion and roughening. The high-entropy composite tribo-layers provide strong stress shielding and avoid oxidative and adhesive wear. Developing similar coupled high-entropy matrix phases can further optimize the tribological properties of the composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Xiangjuan Fan, Wensheng Li, Jun Yang, Shengyu Zhu, Shuai Cui, Xuqiang Li, Lei Shao, Haimin Zhai
Summary: The influence of varying Cr3C2 concentrations on the phase composition, microstructure, mechanical performance, and friction and wear behaviors of Ni3Al-based coatings was examined. The high-temperature lubricity of the coatings was attributed to the presence of soft metal Ag, the brittle-plastic transformation of MoO3, and high-temperature solid lubricants such as NiCr2O4 and Ag2MoO4. The second phase strengthening and solute effect significantly improved the hardness, toughness, and wear resistance of the coatings, with 15 wt% Cr3C2 showing the best performance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Zongxiao Zhu, Tianzuo Shi, Wenyuan Chen, Linjun Wang, Juanjuan Chen, Jun Cheng, Shengyu Zhu, Jun Yang
Summary: In this work, dense CuSn10/WC-17Co composite coatings were deposited using low-pressure cold spraying (LPCS) technology. The effect of WC-17Co cermet content on the microstructure, mechanical properties, and tribological behavior of the coatings was investigated. The results showed that increasing WC-17Co content improved the deformation, hardness, bonding strength, and wear resistance of the composite coatings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Zengguang Yu, Jiao Chen, Jun Cheng, Shengyu Zhu, Hui Tan, Shuai Wang, Qichun Sun, Yong Ding, Jun Yang
Summary: The tribological behaviors of MoAlB ceramic were studied under different temperatures and with various counterpart materials. The results showed that MoAlB exhibited remarkable wear resistance and lubricating performance at high temperatures, with the best performance recorded so far among ceramics. The wear rate of MoAlB was found to be influenced by the counterpart material, with higher hardness resulting in higher wear rate. The temperature also played a role, with different wear mechanisms observed at different temperature ranges.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Jinfu Wang, Feiran Yang, Jun Yang
Summary: In this study, a unified framework for the design of fully steerable circular differential microphone arrays (CDMAs) is developed, which combines the null constraints and the Jacobi-Anger expansion. It is shown that the existing methods can be considered as special cases of this approach and they are indeed connected. Furthermore, it is explained why the null-constrained CDMA can alleviate the deep nulls problem in certain cases but still suffers from severe deep nulls in other cases.
IEEE SIGNAL PROCESSING LETTERS
(2023)
