Mr. Tianyu Zhao Profile

Tianyu Zhao

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Publications (3)

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Proceedings Article | 17 August 2023 Paper

Effects of laser parameters on microgrooves morphology of SiC/SiC composites fabricated by femtosecond laser

Xin Li, Yanping Yuan, Lei Chen, Tianyu Zhao

Proceedings Volume 12757, 127572C (2023) https://doi.org/10.1117/12.2690716

KEYWORDS: Laser processing, Composites, Laser ablation

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Silicon carbide (SiC) fiber-reinforced SiC-matrix (SiC/SiC) composite has a wide range of applications in the aerospace field. However, SiC/SiC composite is typical difficult-to-machine materials due to their non-homogeneous and anisotropic properties, and traditional manufacturing processes cannot meet their processing requirements in aerospace applications. Femtosecond laser processing technology is expected to become the preferred choice to meet this demand, due to their ultrashort irradiation periods and ultrahigh intensities. In this study, the micro-grooving processing on the surface of SiC/SiC composites by femtosecond laser is investigated, and the effects of laser power, scanning speed and scanning frequency on the surface morphology of SiC/SiC composites are investigated. The results show that there are recast layers in the ablation zone and powdery substances in the processing zone during the laser ablation process of SiC/SiC composite. The width and depth of the micro-grooves increase with the increase of laser power and scanning times. When the ablation power is low and the scanning times are few, the grooves are non-uniformly distributed with sawtooth structure. When the ablation power is high and the scanning speed is low, the grooves are serrated. Properly increasing the scanning speed and scanning times can reduce the sawtooth structure and improve the surface quality of the ablated area. This proposed method can achieve good morphology of SiC/SiC and is expected to be applied to industrial processing of SiC/SiC.

Proceedings Article | 16 December 2022 Paper

Laser processing lithium-ion battery anode

Xiaomao Luo, Yanping Yuan, Chunlian Wang, Tianyu Zhao, Lei Chen

Proceedings Volume 12501, 125011A (2022) https://doi.org/10.1117/12.2656602

KEYWORDS: Electrodes, Laser cutting, Lithium, Laser processing, Ions, Laser applications, Scanning electron microscopy, 3D printing, Manufacturing, Laser ablation

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Since the beginning of the new century, energy and environmental issues have always been a hot topic of discussion and research. With the rapid consumption of traditional fossil energy and environmental problems becoming increasingly prominent, it is urgent to find efficient energy storage devices. Lithium-ion battery is a common and representative energy storage device in secondary batteries, and the structure of its electrode material is a key factor affecting the electrochemical performance and safe service life of the entire lithium-ion battery. Laser is widely used in electrode processing due to its high energy concentration, small heat-affected zone, high processing precision, and low requirements for processing environment. Laser processing technology for cutting, drying, constructing three-dimensional micro/nano-structured electrodes or directly printing battery materials can greatly reduce manufacturing costs and improve the electrochemical performance. In this study, the application of several laser processing technologies in the structure of the negative electrode of lithium ion battery is reviewed. The application of laser in electrode cutting, drying and annealing is discussed from the perspective of laser energy concentration and small thermal influence. Starting from the relationship of efficiency, the strategy of constructing a three-dimensional structure on the negative electrode of lithium ion battery by laser processing technology is summarized. The electrochemical performance and the service life of lithium ion battery are prospected.

Proceedings Article | 14 October 2022 Paper

Fabrication of polarization-sensitive metasurfaces by femtosecond laser direct writing

Dongfang Li, Tianyu Zhao, Yanping Yuan, Xinyang Guo, Jimin Chen

Proceedings Volume 12343, 123431X (2022) https://doi.org/10.1117/12.2649120

KEYWORDS: Femtosecond phenomena, Nanostructures, Dewetting, Plasmonics, Laser processing

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Plasmonic colors produced by the resonant interaction between light and metallic nanostructures have been extensively studied. However, the current manufacturing methods for plasmonic metasurfaces rely heavily on lithography and templates, which are prohibitive in terms of scalability, process complexity, efficiency, and economy, severely limiting their wide application. In this study, a method to fabricate polarization-sensitive metal-insulator-metal metasurfaces by femtosecond laser-induced dewetting of gold films has been proposed. The elongation direction of the dewetted nanostructures is controlled by the laser polarization. The structural colors formed by the metasurface are sensitive to the polarization of illumination light. By adjusting the laser power and scanning speed, the metasurfaces can appear yellow, red, and green. This method is expected to be applied in anti-counterfeiting and optical multiplexing.

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