The Experts below are selected from a list of 21792 Experts worldwide ranked by ideXlab platform
Hiroshi Mishina - One of the best experts on this subject based on the ideXlab platform.
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magnetization of ferromagnetic material Surfaces by tribological process
Journal of Applied Physics, 2002Co-Authors: Hiroshi MishinaAbstract:Experimental results showing that the Surface of ferromagnetic materials is spontaneously magnetized by tribological actions such as friction and wear in the absence of external magnetic fields are presented. The magnetization mechanism of the Frictional Surface and wear particles is discussed based on the results of measurements of the magnetic flux density as well as observations using an atomic force microscope (AFM). In particular, the AFM observations performed on the Frictional Surface reveal that extremely fine particles form during the initial stage of wear processes, and the diameter of the debris is observed to be 16–25 nm. The particles are determined to be elemental debris, which is the most fundamental debris composing wear particles. Furthermore, the observed elemental debris formed during the initial stage of tribological actions is of the same order as the single magnetic domain particle that is given by the theoretical calculation and experimental results. The phenomenon of tribomagnetiza...
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magnetization of ferromagnetic material Surfaces by tribological process
Journal of Applied Physics, 2002Co-Authors: Hiroshi MishinaAbstract:Experimental results showing that the Surface of ferromagnetic materials is spontaneously magnetized by tribological actions such as friction and wear in the absence of external magnetic fields are presented. The magnetization mechanism of the Frictional Surface and wear particles is discussed based on the results of measurements of the magnetic flux density as well as observations using an atomic force microscope (AFM). In particular, the AFM observations performed on the Frictional Surface reveal that extremely fine particles form during the initial stage of wear processes, and the diameter of the debris is observed to be 16–25 nm. The particles are determined to be elemental debris, which is the most fundamental debris composing wear particles. Furthermore, the observed elemental debris formed during the initial stage of tribological actions is of the same order as the single magnetic domain particle that is given by the theoretical calculation and experimental results. The phenomenon of tribomagnetiza...
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Surface deformation and formation of original element of wear particles in sliding friction
Wear, 1998Co-Authors: Hiroshi MishinaAbstract:Abstract This paper describes a microscopic investigation of the deformation in the Surface crystal grains and the initial step of wear mechanism in sliding friction using a metallographic microscope integrated in a pin-on-flat apparatus (Frictional Surface microscope). The in situ observation of the change in the Surface crystal grains is performed during the sliding Frictional process to reveal the generation proces of the ‘original element of wear debris’ from the solid Surface. The results suggest that the plastic deformation which is generated at the contacting point in the Surface crystal grains spreads into the inner part of the crystal grain and an original element of wear debris is generated from the Surface crystal grains when a transgranular fracture occurs in it during sliding Frictional process.
Huidi Zhou - One of the best experts on this subject based on the ideXlab platform.
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tribological behaviors of plasma sprayed cual ni graphite composite coating
Tribology International, 2015Co-Authors: Jie Yang, Huidi Zhou, Xiaoqin Zhao, Yunjing Zhang, Jianmin Chen, Hou GuoliangAbstract:Aluminum bronze (CuAl) coating reinforced by nickel cladded graphite (Ni-graphite) was fabricated by air plasma spraying. Results show that the Ni-graphite had excellent interfacial compatibility with the CuAl matrix. With occurrence of re-graphitization of the graphite and the so-formed lubricating film on its Frictional Surface, the CuAl/Ni-graphite coating had a wear rate dozens of times lower than those of the other CuAl-based coatings benefited from the greatly alleviated abrasion wear and splats delamination. Additionally, the CuAl/Ni-graphite coating generated slightest damage to the Frictional counterpart, showing the promise to be a bearing coating.
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preparation and properties of poly p oxybenzoyl aluminum bronze composite coating by atmosphere plasma spraying
Surface & Coatings Technology, 2014Co-Authors: Jie Yang, Guoliang Hou, Xiaoqin Zhao, Jie Chen, Huidi ZhouAbstract:Poly-(p)-oxybenzoyl/aluminum bronze (denoted as POB/CuAl) composite coating was deposited as a candidate of lead-free bearing Surface on a steel substrate by plasma spraying. The composition, microstructure, and chemical feature of the sprayed POB/CuAl composite coating were analyzed by scanning electron microscopy, energy dispersive spectrometry, and Raman spectroscopy. And the friction and wear behavior of the POB/CuAl composite coating was evaluated and compared with that of pure aluminum bronze coating and AISI-E52100 bearing steel on a ball-on-disc reciprocal tribometer. It was found that plasma sprayed POB/CuAl composite coating possesses a low and stable friction coefficient in combination with greatly reduced wear rate as compared with pure CuAl coating and AISI-E52100 bearing steel. More importantly, the POB/CuAl composite coating causes minimum damage to its Frictional counterpart, which is significant for its application as a lead-free bearing Surface. This is because, after the short running-in period under dry sliding condition, the POB/CuAl composite coating forms an “adaptive” Frictional Surface in which the well accommodated POB particles can effectively dissipate the input Frictional energy through elastic deformation and recovery and, consequently, greatly alleviate the abrasive wear and splat delamination of the composite coating.
Jie Yang - One of the best experts on this subject based on the ideXlab platform.
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tribological behaviors of plasma sprayed cual ni graphite composite coating
Tribology International, 2015Co-Authors: Jie Yang, Huidi Zhou, Xiaoqin Zhao, Yunjing Zhang, Jianmin Chen, Hou GuoliangAbstract:Aluminum bronze (CuAl) coating reinforced by nickel cladded graphite (Ni-graphite) was fabricated by air plasma spraying. Results show that the Ni-graphite had excellent interfacial compatibility with the CuAl matrix. With occurrence of re-graphitization of the graphite and the so-formed lubricating film on its Frictional Surface, the CuAl/Ni-graphite coating had a wear rate dozens of times lower than those of the other CuAl-based coatings benefited from the greatly alleviated abrasion wear and splats delamination. Additionally, the CuAl/Ni-graphite coating generated slightest damage to the Frictional counterpart, showing the promise to be a bearing coating.
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preparation and properties of poly p oxybenzoyl aluminum bronze composite coating by atmosphere plasma spraying
Surface & Coatings Technology, 2014Co-Authors: Jie Yang, Guoliang Hou, Xiaoqin Zhao, Jie Chen, Huidi ZhouAbstract:Poly-(p)-oxybenzoyl/aluminum bronze (denoted as POB/CuAl) composite coating was deposited as a candidate of lead-free bearing Surface on a steel substrate by plasma spraying. The composition, microstructure, and chemical feature of the sprayed POB/CuAl composite coating were analyzed by scanning electron microscopy, energy dispersive spectrometry, and Raman spectroscopy. And the friction and wear behavior of the POB/CuAl composite coating was evaluated and compared with that of pure aluminum bronze coating and AISI-E52100 bearing steel on a ball-on-disc reciprocal tribometer. It was found that plasma sprayed POB/CuAl composite coating possesses a low and stable friction coefficient in combination with greatly reduced wear rate as compared with pure CuAl coating and AISI-E52100 bearing steel. More importantly, the POB/CuAl composite coating causes minimum damage to its Frictional counterpart, which is significant for its application as a lead-free bearing Surface. This is because, after the short running-in period under dry sliding condition, the POB/CuAl composite coating forms an “adaptive” Frictional Surface in which the well accommodated POB particles can effectively dissipate the input Frictional energy through elastic deformation and recovery and, consequently, greatly alleviate the abrasive wear and splat delamination of the composite coating.
Nanping Chen - One of the best experts on this subject based on the ideXlab platform.
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a study of the optimization mechanism of solid lubricant concentration in self lubricating composite
Wear, 1997Co-Authors: Yunxin Wu, Fuxing Wang, Yinqian Cheng, Nanping ChenAbstract:Abstract Four Ni MoS 2 self-lubricating composites with varied MoS 2 concentrations were hot-pressed. Their friction and wear behaviors were tested using a ball-on-disk wear machine at both room temperature and 250°C. Morphologies of the worn composite Surfaces were observed under SEM. It was shown that the self-lubricating properties of the composites change in accordance with the formation situation of the Surface lubricating film. With increasing MoS 2 concentration, the integrity of the formed lubricating film increases, and both the friction coefficient and wear rate decrease almost linearly. Above 60% MoS 2 , however, severe spalling of the lubricating film occurs, and the self-lubricating property drops remarkably. From the viewpoint of thin solid film lubrication, corresponding Frictional models were proposed for theoretically analyzing the optimum MoS 2 concentration. It was indicated that the optimum solid lubricant concentration may be determined as such a level that a homogeneous and continuous lubricating film is just formed on the whole Frictional Surface, while the mechanical property of the composite has not declined enough to cause a remarkable decrease in the film's self-lubricity.
Xiaoqin Zhao - One of the best experts on this subject based on the ideXlab platform.
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tribological behaviors of plasma sprayed cual ni graphite composite coating
Tribology International, 2015Co-Authors: Jie Yang, Huidi Zhou, Xiaoqin Zhao, Yunjing Zhang, Jianmin Chen, Hou GuoliangAbstract:Aluminum bronze (CuAl) coating reinforced by nickel cladded graphite (Ni-graphite) was fabricated by air plasma spraying. Results show that the Ni-graphite had excellent interfacial compatibility with the CuAl matrix. With occurrence of re-graphitization of the graphite and the so-formed lubricating film on its Frictional Surface, the CuAl/Ni-graphite coating had a wear rate dozens of times lower than those of the other CuAl-based coatings benefited from the greatly alleviated abrasion wear and splats delamination. Additionally, the CuAl/Ni-graphite coating generated slightest damage to the Frictional counterpart, showing the promise to be a bearing coating.
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preparation and properties of poly p oxybenzoyl aluminum bronze composite coating by atmosphere plasma spraying
Surface & Coatings Technology, 2014Co-Authors: Jie Yang, Guoliang Hou, Xiaoqin Zhao, Jie Chen, Huidi ZhouAbstract:Poly-(p)-oxybenzoyl/aluminum bronze (denoted as POB/CuAl) composite coating was deposited as a candidate of lead-free bearing Surface on a steel substrate by plasma spraying. The composition, microstructure, and chemical feature of the sprayed POB/CuAl composite coating were analyzed by scanning electron microscopy, energy dispersive spectrometry, and Raman spectroscopy. And the friction and wear behavior of the POB/CuAl composite coating was evaluated and compared with that of pure aluminum bronze coating and AISI-E52100 bearing steel on a ball-on-disc reciprocal tribometer. It was found that plasma sprayed POB/CuAl composite coating possesses a low and stable friction coefficient in combination with greatly reduced wear rate as compared with pure CuAl coating and AISI-E52100 bearing steel. More importantly, the POB/CuAl composite coating causes minimum damage to its Frictional counterpart, which is significant for its application as a lead-free bearing Surface. This is because, after the short running-in period under dry sliding condition, the POB/CuAl composite coating forms an “adaptive” Frictional Surface in which the well accommodated POB particles can effectively dissipate the input Frictional energy through elastic deformation and recovery and, consequently, greatly alleviate the abrasive wear and splat delamination of the composite coating.
