High-speed processing of silicon carbide ceramic by high repetition frequency femtosecond laser

2021 ◽  
Author(s):  
Jian Zhang ◽  
Feng Geng ◽  
Zhichao Liu ◽  
Qinghua Zhang ◽  
Qiao Xu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
High Speed ◽  
Repetition Frequency ◽  
Silicon Carbide Ceramic ◽  
High Repetition

High Repetition Frequency Characteristics of Image Intensifier in High-speed Imaging Application

2017 ◽  
Vol 46 (11) ◽  
pp. 1123004
Author(s):  
刘璐 LIU Lu ◽  
郭明安 GUO Ming-an ◽  
严明 YAN Ming ◽  
李刚 LI Gang ◽  
杨少华 YANG Shao-hua ◽  
...  
Keyword(s):  
High Speed ◽  
Image Intensifier ◽  
Frequency Characteristics ◽  
Repetition Frequency ◽  
High Speed Imaging ◽  
High Repetition ◽  
Imaging Application ◽  
Characteristics Of Image

Investigation of High-Speed Nanogrinding Mechanism Based on Molecular Dynamics

2018 ◽  
Author(s):  
Yao Liu ◽  
Beizhi Li ◽  
Yihao Zheng
Keyword(s):  
Molecular Dynamics ◽  
Silicon Carbide ◽  
Brittle Material ◽  
High Speed ◽  
Ground Surface ◽  
Wheel Speed ◽  
Depth Of Cut ◽  
Silicon Carbide Ceramic ◽  
Ductile Grinding ◽  
Sic Ceramic

The SiC ceramic ductile grinding, which can obtain crack-free ground surface, is a challenge in brittle material machining. To understand the brittle material ductile grinding mechanism in the nanoscale, a molecular dynamics (MD) model is built to study the single diamond grit grinding silicon carbide ceramic. Through analyzing the MD simulation process, the grit forces the SiC to deform and form the chip through the plastic deformation and flow. The ground surface has no crack on the surface and damage layer thickness is less than one atom layer under the nanoscale depth of cut, which indicates the nanogrinding can achieve the pure ductile grinding for the SiC ceramic and obtain a crack-free and high-quality ground surface. Grinding force, stress, temperature, and specific energy increase with the wheel speed and depth of cut due to the higher grinding speed and a smaller depth of cut can generate a higher density of defects (vacancies, interstitial atoms, and dislocations) on the workpiece, which can make the silicon carbide ceramic more ductile. The high wheel speed is favorable for the ductile grinding.

High speed and low roughness micromachining of silicon carbide by plasma etching aided femtosecond laser processing

2020 ◽  
Vol 46 (11) ◽  
pp. 17896-17902 ◽  
Author(s):  
Chen Wu ◽  
Xudong Fang ◽  
Feng Liu ◽  
Xin Guo ◽  
Ryutaro Maeda ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
Plasma Etching ◽  
Laser Processing ◽  
High Speed ◽  
Femtosecond Laser Processing

scholarly journals Investigations on the oxidation phenomenon of SiC/SiC fabricated by high repetition frequency femtosecond laser

2020 ◽  
Vol 502 ◽  
pp. 144131 ◽  
Author(s):  
Zhaoyang Zhai ◽  
Chen Wei ◽  
Yanchao Zhang ◽  
Yahui Cui ◽  
Quanren Zeng
Keyword(s):  
Femtosecond Laser ◽  
Repetition Frequency ◽  
High Repetition

Welding of Fused Silica by Using High Repetition Frequency Femtosecond Laser

2018 ◽  
Vol 45 (7) ◽  
pp. 0701007
Author(s):  
丁腾 Ding Teng ◽  
王雪辉 Wang Xuehui ◽  
王关德 Wang Guande ◽  
钱静 Qian Jing ◽  
王何宁 Wang Hening ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fused Silica ◽  
Repetition Frequency ◽  
High Repetition

scholarly journals Low and high repetition frequency femtosecond lasers processing of tungsten-based thin film

2014 ◽  
Vol 32 (4) ◽  
pp. 613-619
Author(s):  
B. Gaković ◽  
S. Petrović ◽  
A. Krmpot ◽  
D. Pantelić ◽  
B. Jelenković ◽  
...  
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Femtosecond Lasers ◽  
Surface Structures ◽  
Repetition Frequency ◽  
Nano Particles ◽  
Laser Polarization ◽  
Thin Film Thickness ◽  
High Repetition ◽  
Linearly Polarized

AbstractIn this work we reported low and high repetition frequency femtosecond laser-induced modifications of tungsten-based thin film. The tungsten-titanium (WTi) thin film, thickness of 190 nm, was deposited by sputtering on single crystal Si (100) wafer. Irradiations were performed in air by linearly polarized and focused femtosecond laser beams with following parameters: (1) pulse duration 160 fs, wavelength 800 nm, laser repetition frequency (LRF) 75 MHz — high LRF, and (2) duration 40 fs, wavelength 800 nm, LRF of 1 kHz — low LRF. The results of femtosecond lasers processing of the WTi thin film revealed laser induced periodical surface structures (LIPSS) in the case of low LRF regime. LIPSSs were formed with different periodicity and different orientation to the laser polarization at the surface: micro-scale LIPSSs with orientation perpendicular to the laser polarization and nano-scale LIPSSs parallel and perpendicular to the laser polarization. After processing of the WTi/Si system in high LRF regime ablation and nano-particles formation were registered.

Effect of Powder-Mixed Dielectric on EDM Process Performance

2020 ◽  
Vol 38 (8A) ◽  
pp. 1226-1235
Author(s):  
Safa R. Fadhil ◽  
Shukry. H. Aghdeab
Keyword(s):  
Silicon Carbide ◽  
High Speed ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
High Speed Steel ◽  
Transformer Oil ◽  
Dielectric Fluid ◽  
Peak Current ◽  
Powder Concentration ◽  
Pulse On Time

Electrical Discharge Machining (EDM) is extensively used to manufacture different conductive materials, including difficult to machine materials with intricate profiles. Powder Mixed Electro-Discharge Machining (PMEDM) is a modern innovation in promoting the capabilities of conventional EDM. In this process, suitable materials in fine powder form are mixed in the dielectric fluid. An equal percentage of graphite and silicon carbide powders have been mixed together with the transformer oil and used as the dielectric media in this work. The aim of this study is to investigate the effect of some process parameters such as peak current, pulse-on time, and powder concentration of machining High-speed steel (HSS)/(M2) on the material removal rate (MRR), tool wear rate (TWR) and the surface roughness (Ra). Experiments have been designed and analyzed using Response Surface Methodology (RSM) approach by adopting a face-centered central composite design (FCCD). It is found that added graphite-silicon carbide mixing powder to the dielectric fluid enhanced the MRR and Ra as well as reduced the TWR at various conditions. Maximum MRR was (0.492 g/min) obtained at a peak current of (24 A), pulse on (100 µs), and powder concentration (10 g/l), minimum TWR was (0.00126 g/min) at (10 A, 100 µs, and 10 g/l), and better Ra was (3.51 µm) at (10 A, 50 µs, and 10 g/l).

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