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Journal articles on the topic 'Self lubricating materials'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

John, Merbin, and Pradeep L. Menezes. "Self-Lubricating Materials for Extreme Condition Applications." Materials 14, no. 19 (September 26, 2021): 5588. http://dx.doi.org/10.3390/ma14195588.

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Lubrication for extreme conditions, such as high temperature, cryogenic temperature, vacuum pressure, high load, high speed, and corrosive environments, is a continuing challenge among tribologists and space engineers due to the inadequate friction and wear properties of liquid lubricants. As a result, tremendous research effort has been put forward to study lubrication mechanisms for various machine elements under challenging conditions over the past two decades. Self-lubricating materials have been most widely used for adequate lubrication in extreme conditions in recent years. This review paper presents state-of-the-art of materials for lubrication in extreme condition applications in aerospace, automotive, and power generation areas. More specifically, solid lubricants dispersed in various matrices for lubrication application were analyzed in-depth under challenging conditions. This study also reports the self-lubricating materials and their lubrication mechanisms. Finally, various applications and challenges of self-lubricating materials were explored.
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2

Ding, Yang, and Peng Yun Song. "The Research Progress of Embedded Solid Lubricant Materials." Advanced Materials Research 535-537 (June 2012): 1369–73. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1369.

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Embedded solid lubricant materials have good self-lubrication characteristics, which can realize lubrication in special some situations such as low-speed, high-load, high-temperature of the machinery without lubricating oil or grease. This paper presents a review concerning the structure of embedded solid lubrication materials, and its lubricating mechanism, the development of embedded solid lubricant materials, the latest research progress of the influence factors such as different types of metal substrates, mosaic, temperature, load, and porous structure and the application example of bearings. The feasibility of embedded solid lubrication materials which may be used in the mechanical seal face is also analyzed.
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3

Zhou, Hua Xiang, Zheng Zhou, and Jing Ping Liu. "High Temperature Cylinder Sleeve Design Research Self-Lubricating Materials." Applied Mechanics and Materials 628 (September 2014): 53–58. http://dx.doi.org/10.4028/www.scientific.net/amm.628.53.

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Cylinder Liner design innovation goal is energy conservation. As the main friction parts engine cylinder liner, reducing friction energy is energy saving basic requirements. Materials research cylinder sleeve is one of the main cylinder liner saving research. Through the piston ring and cylinder liner surface friction dual material hard phase, self-lubricating phase, toughening phase analysis, select compatibility, high strength, heat resistance, good high temperature performance, ease of manufacture, price rational matrix material and an appropriate proportion of nanoscale hard material, self-lubricating materials, ductile materials, using appropriate methods cladding and processing, design developed high-temperature self-lubricating cylinder sets of advanced materials. The latest international high temperature, wear-resistant, self-lubricating materials research: modern nanoα-Al2O3+Ni-base alloy composite materials, Ti2B/Fe metal-ceramic composites, metals and ceramics NiCr-Cr3C2 particles CaF2 self-lubricating composite alloy powder material, NiCr/Cr3C2-WS2 self-lubricating wear-resistant materials were studied and found to TiC, Al2O3 is hard reinforcing phase, CaF self-lubricating phase, NiCr/TiC eutectic toughening phase, high-temperature self-lubricating wear-resistant nanocomposite, and Cr18Ni9 class alloy as base material, by laser cladding method enables conventional cylinder liners manufacturing technological breakthroughs, has practical value.
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4

Wang, Xiu Ling, Li Ying Yang, and Shou Ren Wang. "Research and Development of Self-Lubricating Bearing Materials." Advanced Materials Research 651 (January 2013): 198–203. http://dx.doi.org/10.4028/www.scientific.net/amr.651.198.

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It is significant and necessary to carry out the research and development of self-lubricating bearing. The current study of metal matrix self-lubricating bearing materials is summarized. A new type of high temperature self-lubricating Ti-Al alloy bearing materials is proposed. It is light, anti-friction, anti-corrosion and high temperature resistance (600 °C). The future trend is introduced in the end of this paper.
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EBNER, Martin, Shogo TOIDA, Thomas LOHNER, Klaus MICHAELIS, Bernd-Robert HOEHN, and Karsten STAHL. "Lubrication simulation for self-lubricating gears with oil-impregnated sintered materials." Proceedings of the Materials and Mechanics Conference 2018 (2018): OS0815. http://dx.doi.org/10.1299/jsmemm.2018.os0815.

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6

Kulikov, A. I. "Self-lubricating and self-strengthening molds." Glass and Ceramics 49, no. 10 (October 1992): 489–90. http://dx.doi.org/10.1007/bf00677302.

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7

Wu, Guang Yong, Chong Hai Xu, Yong Lian Zhang, and Ming Dong Yi. "Development of Al2O3/TiC/CaF2 Graded Self-Lubricating Ceramic Cutting Tool Materials." Materials Science Forum 723 (June 2012): 258–63. http://dx.doi.org/10.4028/www.scientific.net/msf.723.258.

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The design concept of functionally graded materials was first introduced into the development of self-lubricating ceramic cutting tool materials. An Al2O3/TiC/CaF2graded self-lubricating ceramic cutting tool material was designed and fabricated. Mechanical properties were evaluated by comparing with those of Al2O3/TiC/CaF2homogeneous self-lubricating ceramic cutting tool material. The results showed that the Al2O3/TiC/CaF2graded self-lubricating ceramic cutting tool material had superior performance to the counterpart. Graded self-lubricating ceramic cutting tool materials are bound to have promising prospect in the field of high speed dry machining.
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8

Cui, Jianbing, Bo Mu, Baoping Yang, Jinfeng Cui, Junhong Guo, Li Tian, and Xia Wang. "Mesoporous silica as smart lubrication containers applied to self‐lubricating polyurethane materials." Journal of Applied Polymer Science 138, no. 1 (June 29, 2020): 49612. http://dx.doi.org/10.1002/app.49612.

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9

Xu, Xiu Guo, Chong Hai Xu, Bin Fang, Chun Lin Wang, and Ming Dong Yi. "Research and Development of Nano-Micro Composite Gradient Self-Lubricating Ceramic Cutting Tools." Advanced Materials Research 602-604 (December 2012): 512–17. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.512.

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The development status of self-lubricating tool materials was reviewed in the present study, as well as the five basic types of self-lubricating tool and the current situation of nanometer materials in ceramic cutting tool. Based on these, the design idea of the functional gradient materials and nano-micro composite materials was introduced into the self-lubricating ceramic cutting tool materials, in order to develop new self-lubricating ceramic cutting tool materials with both good mechanical and frictional properties.
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10

Ivanov, V. A., and S. P. Zakharychev. "Reinforced Antifriction Epoxy Fluoroplastics." Solid State Phenomena 284 (October 2018): 115–19. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.115.

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The materials are antifriction self-lubricating (MAS) based on epoxy fluoroplastics compositions reinforced with various fabrics having increased tribotechnical characteristics under conditions of operation without lubrication, with lubrication or in an aqueous medium. A range of antifriction materials has been developed, as well as the main properties and recommendations for use.
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11

Wu, Guang Yong, Chong Hai Xu, Yong Lian Zhang, and Ming Dong Yi. "State of the Art of Graded Self-Lubricating Ceramic Cutting Tool Materials." Applied Mechanics and Materials 66-68 (July 2011): 1598–604. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1598.

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In this paper, the effects of addition of solid lubricants on mechanical properties, tribological properties and cutting performance of ceramic cutting tool materials were analyzed. The problem that existing homogeneous self-lubricating ceramic cutting tool materials were not available to possess rational combination of antifriction and antiwear properties was pointed out. The main methods to acquire graded self-lubricating materials were discussed. The design concept and research prospect of graded self-lubricating ceramic cutting tool materials were proposed, which would have promising applications in the field of high speed cutting.
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12

Kasahara, Mataichi. "Special issue "Introduction to advanced materials". Self-Lubricating Tribo-Materials." Journal of the Robotics Society of Japan 13, no. 2 (1995): 205–8. http://dx.doi.org/10.7210/jrsj.13.205.

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13

Tuchinskiy, L., E. Veksler, R. Loutfy, and M. Williams. "Tribological Characteristics of Si3N4-based Self-Lubricating Materials." Tribology Transactions 43, no. 4 (January 2000): 603–10. http://dx.doi.org/10.1080/10402000008982384.

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14

Ebner, Martin, Thomas Lohner, Klaus Michaelis, Bernd-Robert Höhn, and Karsten Stahl. "Self-lubricating gears with oil-impregnated sintered materials." Forschung im Ingenieurwesen 81, no. 2-3 (August 16, 2017): 175–90. http://dx.doi.org/10.1007/s10010-017-0227-z.

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15

Song, Peilong, Xuefeng Yang, Shouren Wang, and Liying Yang. "Tribological properties of self-lubricating laminated ceramic materials." Journal of Wuhan University of Technology-Mater. Sci. Ed. 29, no. 5 (October 2014): 906–11. http://dx.doi.org/10.1007/s11595-014-1018-0.

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16

Brick, C. M., E. R. Chan, S. C. Glotzer, J. C. Marchal, D. C. Martin, and R. M. Laine. "Self-Lubricating Nano-Ball-Bearings." Advanced Materials 19, no. 1 (January 8, 2007): 82–86. http://dx.doi.org/10.1002/adma.200601551.

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17

Tang, Siwen, Rui Wang, Pengfei Liu, Qiulin Niu, Guoqing Yang, Wenhui Liu, and Deshun Liu. "Preparation of WC-TiC-Ni3Al-CaF2 functionally graded self-lubricating tool material by microwave sintering and its cutting performance." High Temperature Materials and Processes 39, no. 1 (February 28, 2020): 45–53. http://dx.doi.org/10.1515/htmp-2020-0004.

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AbstractWith the concern of the environment, green dry cutting technology is getting more and more attention and self-lubricating tool technology plays an important role in dry cutting. Due to the demand for high temperature performance of tools during dry cutting process, cemented carbide with Ni3Al as the binder phase has received extensive attention due to its excellent high temperature strength and high temperature oxidation resistance. In this paper, WC-TiC-Ni3Al-CaF2 graded self-lubricating material and tools were prepared by microwave heating method, and its microstructure, mechanical properties and cutting performance were studied. Results show that gradient self-lubricating material can be quickly prepared by microwave heating technology, and the strength is equivalent to that of conventional heating technology. CaF2 not only plays a role in self-lubrication, but also refines the grain of the material. A reasonable gradient design can improve the mechanical properties of the material. When the gradient distribution exponent is n1 = 2, the material has high mechanical properties. Cutting experiments show that the WC-TiC-Ni3Al-CaF2 functional gradient self-lubricating tool has better cutting performance than the homogeneous WC-TiC-Ni3Al hard alloys.
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18

Khatkar, S. K., N. M. Suri, S. Kant, and Pankaj. "A Review on Mechanical and Tribological Properties of Graphite Reinforced Self Lubricating Hybrid Metal Matrix Composites." REVIEWS ON ADVANCED MATERIALS SCIENCE 56, no. 1 (May 1, 2018): 1–20. http://dx.doi.org/10.1515/rams-2018-0036.

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Abstract Hybrid metal matrix composites (HMMC’s) are next generation metal matrix composite materials that have the potential of gratifying recent demands of advanced energy applications in the field of aerospace, automobile and biomedical. The MMC’s have to work at elevated temperature or vacuum environment where lubrication using liquid lubricants is ineffective or difficult to achieve; moreover, liquid lubricants are not environmental friendly, since they releases pollutants into environment. Solid lubricants such as graphite, CNT’s, MoS2and graphene have been widely used as secondary reinforcements to meet such operational needs by fabricating green or environmental friendly self lubricating HMMC’s. This article outlines recent advances in the area of self lubricating HMMC’s reinforced with graphite as secondary reinforcement. The focus of the study was on mechanical and tribological behavior of Aluminum and magnesium based self lubricating HMMC’s. The effect of graphite, different hybrid reinforcements and their strengthening mechanisms are also discussed in detail.
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19

Zhu, Yu Feng. "Research and Design on Reciprocating Oilless Air Compressors." Advanced Materials Research 945-949 (June 2014): 358–61. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.358.

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Research was made in order to design a good reciprocating oilless air compressor. Grease lubrication bearings are used in connecting rod larger heads, smaller heads and main shaft necks, its structures are designed, so the oilless lubrications are achieved over there. Self-lubricating materials are used to make piston pings and guiding pings, the lap-joint structure is used in piston pings, so the problems of oilless lubrication and seal between piston component and cylinders can be solved. The structure of unloading slots for guiding pings, smaller radius-length ratios and lower pressure ratios can make piston pings and guiding pings run long time. Series products of oilless air compressors which are made as above have gone into mass production.
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20

Deng, Jianxin. "SELF-LUBRICATING CERAMIC TOOL MATERIALS AND ITS CUTTING PERFORMANCES." Chinese Journal of Mechanical Engineering 39, no. 08 (2003): 106. http://dx.doi.org/10.3901/jme.2003.08.106.

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21

Torres, Hector, Manel Rodríguez Ripoll, and Braham Prakash. "Tribological behaviour of self-lubricating materials at high temperatures." International Materials Reviews 63, no. 5 (December 11, 2017): 309–40. http://dx.doi.org/10.1080/09506608.2017.1410944.

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22

Evtushok, T. M., I. I. Beloborodov, A. D. Kostenko, V. A. Kotenko, and S. G. Artyukhova. "New self-lubricating antifriction materials based on titanium nitride." Powder Metallurgy and Metal Ceramics 44, no. 11-12 (November 2005): 527–30. http://dx.doi.org/10.1007/s11106-006-0020-2.

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23

Shiao, Shin Jen, Wei Shung Fu, Chin Lin Tuo, and Un I. Cheng. "Polymer-based self-lubricating material." Journal of Applied Polymer Science 80, no. 9 (2001): 1514–19. http://dx.doi.org/10.1002/app.1242.

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24

Yi, Ming Dong, Chong Hai Xu, Zhao Qiang Chen, and Guang Yong Wu. "Preparation of Al2O3 Based Nano-Micro Composite Gradient Self-Lubricating Ceramic Tool Materials." Materials Science Forum 788 (April 2014): 613–16. http://dx.doi.org/10.4028/www.scientific.net/msf.788.613.

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Aiming at the low mechanical property of existing self-lubricating ceramic cutting tool material, a new Al2O3 based nanomicro composite gradient self-lubricating ceramic tool material was developed by applying the design concept of nanomicro composite. The self-lubricating ceramics was composed of ceramic matrix and self-lubricating component, and was prepared by hot pressing technology at a hot-pressing temperature of 1650°C, pressure of 30MPa, and duration of 15min. The model of gradient ceramic tool material is symmetrical composition distribution, and the compositional distribution n and layer number are 1.8 and 7, respectively. The result shows that the interfaces between layers are bonded well and no cracks or defects can be observed. Compare with the homogeneous material, the flexural strength, hardness and fracture toughness of Al2O3 based graded material increase by 74%, 5.2% and 3.9%, respectively.
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25

Zhang, Guotao, Yanguo Yin, Ming Xu, and Congmin Li. "Tribological properties and mechanism of the bilayer iron based powder metallurgy materials." Industrial Lubrication and Tribology 70, no. 9 (November 19, 2018): 1642–48. http://dx.doi.org/10.1108/ilt-08-2017-0248.

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Purpose This paper aims to obtain high mechanical strength and good self-lubricating property of iron-based powder metallurgy materials. A new type of bilayer material with dense substrate and porous surface was proposed in this paper to obtain high strength and good self-lubricating property. Design/methodology/approach The materials were prepared by powder metallurgy. Their friction and wear properties were investigated with an end-face tribo-tester. Energy dispersive spectrometer, X-ray diffraction and the 3D laser scanning technologies were used to characterise the tribological properties of materials. The tribological and bearing mechanisms of the monolayer and bilayer materials were compared. Findings The results show that adding proper TiH2 can effectively improve the porosity and hardness. With the TiH2 content increased from 0 to 4 per cent, the average friction coefficients increase slowly, and the wearability decreases first and then increases. When containing 3.5 per cent TiH2, high strength and good self-lubrication characteristics are obtained. Besides, the tribological properties of monolayer materials are better than those of bilayer materials when the load is between 980 and 1,470 N, while the opposite result is obtained under the load varied from 1,470 to 2,450 N. In the bilayer material, the porous oil surface can lubricate well and the dense substrate can improve the mechanical property. So, its comprehensive tribological and mechanical properties are better than those of monolayer material. Originality/value The friction and wear properties of a new type bilayer materials were investigated. And their tribological mechanisms were proposed. This work can provide a theoretical reference for developing high-performance iron-based oil materials under boundary lubrication.
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26

Miura, Hideshi, Hiromitu Morikawa, Yuji Kawakami, and Akiyoshi Ishibashi. "Development of Self-lubricating Wear-Resistant Materials Through MIM Process." Journal of the Japan Society of Powder and Powder Metallurgy 45, no. 5 (1998): 436–41. http://dx.doi.org/10.2497/jjspm.45.436.

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27

XU, Chonghai. "Development of Multicomponent Graded Self-lubricating Ceramic Cutting Tool Materials." Journal of Mechanical Engineering 50, no. 7 (2014): 94. http://dx.doi.org/10.3901/jme.2014.07.094.

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28

Wang, Xiu Ling, Li Ying Yang, Shou Ren Wang, and Yi Zhang. "Tribological Properties of Ti-Al Alloy Self-Lubricating Composite Materials." Advanced Materials Research 842 (November 2013): 114–17. http://dx.doi.org/10.4028/www.scientific.net/amr.842.114.

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A series of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 (CB) self-lubricating composites with addition of different weight percentage of solid lubricant were prepared by vacuum hot pressing sintering. Sliding wear tests against 45#steel were performed on the specimen in dry conditions, worn morphology was observed by the scanning electron microscope (SEM). The test results show that when addition of solid lubricant weight percentage is 10%, the worn surface of the composites is most smooth.The main wear mechanisms of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 composite are abrasive wear and adherent wear.
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29

Chen, Suiyuan, Di An, Yuning Bi, Jing Liang, and Changsheng Liu. "Preparation of novel polytetrafluoroethylene/copper-matrix self-lubricating composite materials." Journal of Composite Materials 48, no. 13 (May 27, 2013): 1561–74. http://dx.doi.org/10.1177/0021998313488151.

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30

Watanabe, Y. "Sliding contact characteristics between self-lubricating composite materials and copper." IEEE Transactions on Components, Hybrids, and Manufacturing Technology 16, no. 4 (June 1993): 442–48. http://dx.doi.org/10.1109/33.237941.

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31

Il'ina, Z. T., L. F. Kolesnichenko, and I. N. Tupitsyn. "Tribotechnical properties of self-lubricating polymer materials containing molybdenum dichalcogenides." Soviet Powder Metallurgy and Metal Ceramics 26, no. 8 (August 1987): 667–70. http://dx.doi.org/10.1007/bf00810631.

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32

Mai, Y. J., Y. G. Li, S. L. Li, L. Y. Zhang, C. S. Liu, and X. H. Jie. "Self-lubricating Ti3C2 nanosheets/copper composite coatings." Journal of Alloys and Compounds 770 (January 2019): 1–5. http://dx.doi.org/10.1016/j.jallcom.2018.08.100.

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33

Pelletiers, Tom, Anil Nadkarni, Richard Ijeoma, and Thomas Murphy. "Improving performance from self-lubricating bronze bearings." Metal Powder Report 62, no. 4 (April 2007): 26–31. http://dx.doi.org/10.1016/s0026-0657(07)70085-1.

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34

Turis, Ján, Pavel Beňo, and Witold Biały. "The Optimal Tribotechnical Factors in the Design of Machines – Environmental Element in the Production Systems." Management Systems in Production Engineering 26, no. 4 (December 1, 2018): 207–11. http://dx.doi.org/10.1515/mspe-2018-0033.

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Abstract The article deals with the experimental detection of the tribotechnical parameters for two different types of sliding bearings which are intended for operation without an additional lubrication due to the increasing requirements in ecology and environment. The dominant tribotechnical parameters of the self-lubricating bearing are the coefficient of friction and temperature. To determine these parameters, an experimental method was applied in this paper. The introductory part deals with materials of self-lubricating sliding bearings, their properties and usage. The experimental part consists of the evaluation of friction characteristics and geometric change of a surface after sliding pairs were being worn. Experimental examined sliding pairs comprise a sliding bearing and the shaft. The aim of this research was to determine the effect of radial force on tribotechnical parameters in order to predict the behavior of examined sliding bearings in real operating conditions.
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35

Deng, Xiaobin, Xiaoliang Shi, Xiyao Liu, Yubin Liu, and Bing Xue. "Study on the thickness of lubricating film of M50-Ag self-lubricating composites." Lubrication Science 31, no. 1-2 (November 28, 2018): 11–20. http://dx.doi.org/10.1002/ls.1442.

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36

Mulligan, C. P., and D. Gall. "CrN–Ag self-lubricating hard coatings." Surface and Coatings Technology 200, no. 5-6 (November 2005): 1495–500. http://dx.doi.org/10.1016/j.surfcoat.2005.08.063.

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37

Fusaro, R. L. "Self-lubricating polymer composites and polymer transfer film lubrication for space applications." Tribology International 23, no. 2 (April 1990): 105–22. http://dx.doi.org/10.1016/0301-679x(90)90043-o.

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38

Campos, K. R., P. Kapsa, C. Binder, A. N. Klein, and J. D. B. de Mello. "Tribological evaluation of self-lubricating sintered steels." Wear 332-333 (May 2015): 932–40. http://dx.doi.org/10.1016/j.wear.2015.01.056.

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39

Colas, Guillaume, Aurélien Saulot, Yann Michel, Tobin Filleter, and Andreas Merstallinger. "Experimental Analysis of Friction and Wear of Self-Lubricating Composites Used for Dry Lubrication of Ball Bearing for Space Applications." Lubricants 9, no. 4 (April 3, 2021): 38. http://dx.doi.org/10.3390/lubricants9040038.

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Lubricating space mechanisms are a challenge. Lubrication must be sustained in different environments, for a very long period of time, and without any maintenance possible. This study focuses on the self-lubricating composite used in the double transfer lubrication of ball bearing. Ball/races contacts are lubricated via the transfer of materials from the cage that is made of the composite. A dedicated tribometer has been designed for the study. A specificity of the tribometer is to not fully constrain the composite sample but to let it move, as the cage would do in the bearing. Four composites (PTFE, MoS2, glass or mineral fibers) where tested in ultrahigh vacuum and humid air environments. Transfer was achieved with morphologies and composition similar to what is observed on real bearings. Adhesion measurements performed on composite materials before and after friction allowed one to explain the differences in tribological behaviors observed (transfer quality and contact instabilities). Beyond strengthening the composites, fibers are shown to be critical in trapping mechanically and chemically the transferred material to lubricate and prevent instabilities. Equilibrium between internal cohesion of transferred material, and adhesion to counterparts must be satisfied. Mass spectrometry showed that water appears also critical in the establishment of stable transfer film, even in vacuum.
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40

Deng, Jian Xin, Tong Kun Cao, and Jia Lin Sun. "Mechanical Properties and Microstructure of Self-Lubricating Ceramic Cutting Tool Materials." Materials Science Forum 471-472 (December 2004): 221–24. http://dx.doi.org/10.4028/www.scientific.net/msf.471-472.221.

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Al2O3/TiC ceramic tool materials with the addition of solid lubricants such as BN and CaF2 were produced by hot pressing. Effect of the solid lubricants on the microstructure and mechanical properties has been studied. Results showed that AlN phase resulted from the reaction of Al2O3 with BN was formed in Al2O3/TiC/BN composite after sintering. Significant micro-cracks resulted from the residual stress owing to the difference in the thermal expansion coefficient were found on the polished surface, and caused large mechanical properties degradation. While Al2O3/TiC/CaF2 composite showed higher flexural strength, fracture toughness, and hardness compared with that of Al2O3/TiC/BN composite owing its porosity absent and finer microstructure.
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41

Gawarkiewicz, R., and M. Wasilczuk. "Wear measurements of self-lubricating bearing materials in small oscillatory movement." Wear 263, no. 1-6 (September 2007): 458–62. http://dx.doi.org/10.1016/j.wear.2006.12.060.

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42

Drozdov, Yu N., V. A. Nadein, V. N. Puchkov, A. P. Krasnov, and M. V. Puchkov. "Sliding bearings used as seismic dampers with composite self-lubricating materials." Journal of Friction and Wear 32, no. 6 (December 2011): 404–12. http://dx.doi.org/10.3103/s1068366611060043.

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43

Teisanu, Cristina, and Stefan Gheorghe. "Development of New PM Iron-Based Materials for Self-Lubricating Bearings." Advances in Tribology 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/248037.

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Using PM technologies, new antifriction materials based on iron powder with different addition elements were developed in order to obtain self-lubricated bearings with improved tribological features. The elemental powder mixtures were blended for 2 hours in a 3D homogenization device, were compacted at a pressure of 500 MPa, and then sintered in dry hydrogen atmosphere at different temperatures for different maintaining times. The effect of technological parameters on physical properties (density and dimensional changes) was presented in this study. The mechanical and tribological properties (tensile strength, hardness, impact energy, friction coefficient, and wear rate) related to addition elements were evaluated. The tribological behaviour of the selected iron-based alloys was analysed by pin on disc tests without lubrication. Also, the wear surface scars and the microstructure of the wear surfaces were investigated.
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44

Bobzin, K., T. Brögelmann, C. Kalscheuer, and M. Thiex. "Self-lubricating triboactive (Cr,Al)N+Mo:S coatings for fluid-free applications." Journal of Materials Science 56, no. 27 (July 1, 2021): 15040–60. http://dx.doi.org/10.1007/s10853-021-06255-9.

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AbstractWithin this study, self-lubricating and triboactive (Cr,Al)N+Mo:S coatings were developed and investigated for the deposition on components in a low-temperature physical vapor deposition (PVD) hybrid process. Therefore, direct current magnetron sputtering (dcMS) and high power pulse magnetron sputtering (HPPMS) PVD were combined by using an industrial coating machine. Hereby, it was possible to deposit dense and smooth triboactive, self-lubricating nitride coatings with different chemical compositions and architectures on 16MnCr5E samples. Two coating architectures, a matrix monolayer and a graded coating structure, were developed to evaluate the effect on the tribological behavior. The morphology and coating thickness were analyzed by means of scanning electron microscopy (SEM). Furthermore, the indentation hardness and modulus of indentation as well as the compound adhesion between substrate materials and coating were analyzed. Tribological analyses of (Cr,Al)N+Mo:S-coated and uncoated samples were conducted under fluid-free friction regime at room temperature T = (20 ± 3) °C, a velocity v = 0.1 m/s and a distance s = 1000 m by varying the Hertzian contact pressure from 400 MPa ≤ pH ≤ 1300 MPa against steel counterparts, 100Cr6, in a pin-on-disk (PoD) tribometer. The graded coating architecture of (Cr,Al)N+Mo:S enabled a significant wear and friction reduction. Furthermore, Raman analyses prove the formation of solid lubrication tribofilm containing MoS2, MoO3 MoO2 and MoxOy at the toplayer of a graded (Cr,Al)N+Mo:S coating, which are responsible for the improved tribological behavior.
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45

Cao, Tong Kun, Chun Sheng Shan, and Jun Peng Ge. "The Design of Self-Lubricating Ceramic Tool Material." Applied Mechanics and Materials 331 (July 2013): 407–10. http://dx.doi.org/10.4028/www.scientific.net/amm.331.407.

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Chemical compatibility of self-lubricating ceramic tool materials, such as Al2O3/TiC/MoS2, Al2O3/TiC/h-BN, Al2O3/TiC/CaF2, were analyzed and calculated, and the results were verified by X-ray diffraction patterns. The optimal volume content of solid lubricant was calculated by the thermal stress theory under specific condition. The results show that under high temperature, there were some reactions in Al2O3/TiC/MoS2 and Al2O3/TiC/h-BN, while there were no reactions in Al2O3/TiC/CaF2. To Al2O3/TiC/CaF2, the optimal volume content of CaF2 is 25.1% under specific condition.
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46

Yan, Ke, Tingting Yin, Jiannan Sun, Jun Hong, and Yongsheng Zhu. "Flow Mechanism Characterization of Porous Oil-Containing Material Base on Micro-Scale Pore Modeling." Materials 14, no. 14 (July 13, 2021): 3896. http://dx.doi.org/10.3390/ma14143896.

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The self-lubricating effect of the porous oil-containing cage is realized by storing and releasing lubricants through its internal micro-scale pore structure. The internal flow and heat transfer process in the micron-submicron pore structure is crucial to the self-lubricating mechanism of the porous oil-containing cage. To this end, a new modeling method of porous cage was proposed based on random seeds theory, and the local two-dimensional models of porous cage with different micro-scale pore structure were established. The multiphysics coupling simulation analysis of lubricating oil inside the porous cage with the effect of centrifugal force and thermal expansion was carried out based on the COMSOL Multiphysics platform. In order to characterize the micro-scale pore structure, new structural parameter indicators, such as relative surface perimeter, effective porosity, tortuosity and fluid properties related to the internal flow process, were all extracted from the above models. Combing with the Hagen–Poiseuille equation, a flow resistance model of oil flow inside the porous oil-containing cage was obtained. Finally, comparison of simulation results and analytical solutions of the micro-scale resistance model was carried out to verify the correctness of the micro-scale resistance model. The work provides a new direction for the study of the lubrication mechanism of the porous oil-containing cage.
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47

Chen, Sui Yuan, Xin Rong Li, Yu Ning Bi, Daniel Wellburn, Jing Liang, and Chang Sheng Liu. "Preparation of the Carbon Fiber/Cu Alloy Matrix Self-Lubricating Composite Materials." Applied Mechanics and Materials 670-671 (October 2014): 164–67. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.164.

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Using 663-tin bronze, Ni, W, nanoAl2O3, MoS2, graphite, CaF2, and Ni coated graphite as the matrix alloy powder, in which copper-coated carbon fiber of 5%, 7%, 9%, 11% and 13% in volume fraction were added as the reinforcing phase, a novel type carbon fiber/copper-matrix self-lubricating composite materials was prepared by means of powder metallurgy. The results indicate that the mechanical properties of the composite materials are improved after adding copper-coated carbon fibers. The composite materials reach optimal overall mechanical performance under testing when the volume fraction of the added copper-coated carbon fibers is 11%.: with a hardness of 57.8 HV and a compressive strength of 222 MPa. The addition of carbon fiber also improved the friction and wear properties of the composite materials. Increasing the volume fraction of fiber, was found to increase the wear resistance and improve self-lubricating performance. A volume fraction of 11% gave a friction coefficient of 0.09 and abrasion loss of 4mg.
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48

Mutoh, Y., K. Tanaka, and M. Uenohara. "Retainer-Dependent Wear of Silicon Nitride Bearings at High Temperatures." Journal of Tribology 116, no. 3 (July 1, 1994): 463–69. http://dx.doi.org/10.1115/1.2928866.

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Several retainer materials for high-temperature silicon nitride bearings to be used in air were examined with a high-temperature rolling three-ball tester. The “soft” or “self-lubricating” retainer materials (metal-bonded MoS2-WS2 alloys, a carbon-carbon composite and graphite) tended to yield longer bearing life, lower silicon nitride wear rate and lower traction coefficients than the hard retainers (Fe-based sintered alloys, chromia and silicon nitride). The main problem in the use of the self-lubricating retainer materials was their rapid wear by tribo-oxidation at high temperatures.
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49

Ilie, Filip, and Constantin Tita. "Modelling and Experimentation of Solid Lubrification with Powder MoS2 through Self-Repairing and Self-Replenishing." Advanced Materials Research 463-464 (February 2012): 1120–24. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1120.

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Molybdenum disulphides (MoS2), which belong to the family of transition metal dichalcogenides, are well known for their solid lubricating behaviour. Thin films of MoS2 exhibit extremely low coefficient of friction in dry environments, and are typically applied by mixed in oil, grease or impregnated into porous matrix of powdered materials, sputter deposition, pulsed laser ablation, evaporation or chemical vapour deposition and, which are essentially either line-of-sight or high temperature processes. Solid lubricant coatings are attractive because they can reduce friction-generated heat. MoS2 is a common solid lubricant. However, the use of MoS2 can limited by excessive wear, as well as a friction coefficient. Several studies on solid lubricant coatings demonstrated success in lubricating dry sliding contacts over very long periods in tribometer tests or reciprocating sliding experiments.Several pellet-on-disk and pad-on-disk tribometer tests were conducted to study the lubrication characteristics of third-body particles of MoS2 powder. The tests consisted of simultaneous pellet-on-disk and pad-on-disk sliding contacts. Results from the tests show the self-repairing, self-replenishing, oil-free lubrication mechanism of MoS2. A theoretical control volume fractional coverage (CVFC) model was developed to predict: - (1) the friction coefficient at the pad-on-disk interface and - (2) the wear coefficient for the lubricated pellet-on-disk sliding contact. The fractional coverage varies with time and quantifies the amount of third-body film covering the disk asperities. Results from the model capture the tribological behaviour of the experimental sliding contacts reasonably well. The aim of this paper is modeling and experimentation of solid lubrification with MoS2 particles through self-repairing and self-replenishing and through the comparision between theoretical and experimental results obtained in the process of friction and wear by tribological tests.
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50

Hanada, K., T. Shoji, M. Mayuzumi, and T. Sano. "Development of self-lubricating titania/diamond nanoparticle composite." Materials Science and Technology 20, no. 9 (September 2004): 1103–8. http://dx.doi.org/10.1179/026708304225019731.

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