The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Quanzhong Zhao - One of the best experts on this subject based on the ideXlab platform.
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manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching
Tribology International, 2016Co-Authors: Zhuo Wang, Chengwei Wang, Quanzhong Zhao, Min WangAbstract:Abstract We reported on the manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching. The micro-grooved textures were formed on the steel surface, accompanied with the appearance of nanostructures with grain sized of 80–400 nm, oxides thin film (Fe 2 O 3 and Cr 2 O 3 ) and martensite during Picosecond Laser surface texturing process. The tribological tests indicated that the average friction coefficients and wear rates of textured surfaces initially increased then decreased with the increase of spacing of micro-grooves. The well-controlled friction and wear properties are attributed to the combined effects of induced micro-/nanostructures, martensitic transformation and oxides thin film in the local quenched zone of stainless steel samples.
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modification of wettability of stainless steel by Picosecond Laser surface microstructuring
Photonics Research, 2015Co-Authors: Chengwei Wang, Yang Zhang, Quanzhong ZhaoAbstract:We report on the modification of the wettability of stainless steel by Picosecond Laser surface microstructuring in this paper. Compared with traditional methods, Picosecond Laser-induced surface modification provides a fast and facile method for surface modification without chemical damage and environmental pollution. As a result of treatment by 100 ps Laser pulses, microstructures are fabricated on the stainless steel sample surface, contributing to the increase of the contact angle from 88° to 105°, which realizes a transformation from hydrophilicity to hydrophobicity. The morphological features of fabricated microstructures are characterized by scanning electron microscopy and optical microscopy.
Chengwei Wang - One of the best experts on this subject based on the ideXlab platform.
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manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching
Tribology International, 2016Co-Authors: Zhuo Wang, Chengwei Wang, Quanzhong Zhao, Min WangAbstract:Abstract We reported on the manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching. The micro-grooved textures were formed on the steel surface, accompanied with the appearance of nanostructures with grain sized of 80–400 nm, oxides thin film (Fe 2 O 3 and Cr 2 O 3 ) and martensite during Picosecond Laser surface texturing process. The tribological tests indicated that the average friction coefficients and wear rates of textured surfaces initially increased then decreased with the increase of spacing of micro-grooves. The well-controlled friction and wear properties are attributed to the combined effects of induced micro-/nanostructures, martensitic transformation and oxides thin film in the local quenched zone of stainless steel samples.
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modification of wettability of stainless steel by Picosecond Laser surface microstructuring
Photonics Research, 2015Co-Authors: Chengwei Wang, Yang Zhang, Quanzhong ZhaoAbstract:We report on the modification of the wettability of stainless steel by Picosecond Laser surface microstructuring in this paper. Compared with traditional methods, Picosecond Laser-induced surface modification provides a fast and facile method for surface modification without chemical damage and environmental pollution. As a result of treatment by 100 ps Laser pulses, microstructures are fabricated on the stainless steel sample surface, contributing to the increase of the contact angle from 88° to 105°, which realizes a transformation from hydrophilicity to hydrophobicity. The morphological features of fabricated microstructures are characterized by scanning electron microscopy and optical microscopy.
Cuixiu Xiong - One of the best experts on this subject based on the ideXlab platform.
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Investigation of temporal evolution of Picosecond Laser pulse by synchronized femtosecond Laser pulse
Journal of Nonlinear Optical Physics & Materials, 2018Co-Authors: Yangbao Deng, Guangfu Zhang, Shuguang Deng, Ye Tian, Cuixiu XiongAbstract:In this paper, we theoretically and experimentally investigate the initial temporal characterization and the temporal evolution of a Picosecond Laser pulse by a synchronized femtosecond Laser pulse. After theoretically analyzing the measurement principle, we experimentally measure the initial temporal characterization of the Picosecond Laser pulse. Further, the temporal evolution of the Picosecond Laser pulse propagating in different lengths of a carbon disulfide (CS2) is measured. We find that the initial temporal shape of the Picosecond Laser pulse is smooth and clean. As increasing of the CS2 length, the pulse width of the Picosecond Laser pulse has a trend of slight narrow owing to the spatiotemporal coupling effect.
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Investigation of temporal evolution of Picosecond Laser pulse by synchronized femtosecond Laser pulse
Journal of Nonlinear Optical Physics & Materials, 2018Co-Authors: Yangbao Deng, Guangfu Zhang, Shuguang Deng, Ye Tian, Cuixiu XiongAbstract:In this paper, we theoretically and experimentally investigate the initial temporal characterization and the temporal evolution of a Picosecond Laser pulse by a synchronized femtosecond Laser pulse...
Oliver B Wright - One of the best experts on this subject based on the ideXlab platform.
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fundamentals of Picosecond Laser ultrasonics
Ultrasonics, 2015Co-Authors: Osamu Matsuda, M C Larciprete, Roberto Li Voti, Oliver B WrightAbstract:Abstract The aim of this article is to provide an introduction to Picosecond Laser ultrasonics, a means by which gigahertz–terahertz ultrasonic waves can be generated and detected by ultrashort light pulses. This method can be used to characterize materials with nanometer spatial resolution. With reference to key experiments, we first review the theoretical background for normal-incidence optical detection of longitudinal acoustic waves in opaque single-layer isotropic thin films. The theory is extended to handle isotropic multilayer samples, and is again compared to experiment. We then review applications to anisotropic samples, including oblique-incidence optical probing, and treat the generation and detection of shear waves. Solids including metals and semiconductors are mainly discussed, although liquids are briefly mentioned.
Zhuo Wang - One of the best experts on this subject based on the ideXlab platform.
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manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching
Tribology International, 2016Co-Authors: Zhuo Wang, Chengwei Wang, Quanzhong Zhao, Min WangAbstract:Abstract We reported on the manipulation of tribological properties of stainless steel by Picosecond Laser texturing and quenching. The micro-grooved textures were formed on the steel surface, accompanied with the appearance of nanostructures with grain sized of 80–400 nm, oxides thin film (Fe 2 O 3 and Cr 2 O 3 ) and martensite during Picosecond Laser surface texturing process. The tribological tests indicated that the average friction coefficients and wear rates of textured surfaces initially increased then decreased with the increase of spacing of micro-grooves. The well-controlled friction and wear properties are attributed to the combined effects of induced micro-/nanostructures, martensitic transformation and oxides thin film in the local quenched zone of stainless steel samples.