Effects of pH Values and H2O2 Concentrations on the Chemical Enhanced Shear Dilatancy Polishing of Tungsten

Xu, Liang; Wang, Lin; Chen, Hongyu; Wang, Xu; Chen, Fangyuan; Lyu, Binghai; Hang, Wei; Zhao, Wenhong; Yuan, Julong

doi:10.3390/mi13050762

Cited by 14 publications

(12 citation statements)

References 36 publications

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“…The fabrication procedure was made up of the following two process: vacuum coating technology and femtosecond laser assisted chemical etching (FLACE includes two steps the laser writing process and the chemical wet etch), as shown in Figure 1. Chemical etching refers to the chemical reaction between materials and etchants, which can improve the surface quality of materials [26]. A femtosecond Ti: sapphire pulsed laser with 35 fs, central wavelength 800 nm and repetition rate 1 kHz were vertically focused into the sample to modify the materials by a 10× objective lens (NA = 0.9, Nikon).…”

Section: Methodsmentioning

confidence: 99%

Glass Surface Modification Was Induced by the Combination of Coating Technology and Femtosecond Laser Assisted Chemical Etching

et al. 2022

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Due to its high hardness and high transmittance, ultra-white glass has a strong application prospect in the fields of optoelectronics industry and experimental instruments. However, because of its brittleness, it was still a difficult problem in the machining industry. Surface modification provides a basic research idea for ultra-white glass microstructure processing. An effective method to obtain surface modified area on ultra-white glass was presented. The modified zone on the surface of ultra-white glass was induced by the technique of coating and femtosecond laser-assisted chemical etching. The method combines vacuum coating with femtosecond laser irradiation. Next, the modified glass was processed with highly selective potassium hydroxide solution. In order to control the surface size more efficiently, the optimization experiment of laser parameters and chemical parameters on the machining process was carried out. The experimental results show that the method made the surface modification of ultra-white glass more easily and provides basic research for fabricating microchannels on the material.

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Section: Methodsmentioning

confidence: 99%

Glass Surface Modification Was Induced by the Combination of Coating Technology and Femtosecond Laser Assisted Chemical Etching

et al. 2022

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“…Surface treatment is a process of artificially forming a hardened layer on the target surface by using induced residual stress in order to forge a material that has different properties from the mechanical, physical and chemical properties of the original target material [ 1 , 2 , 3 ]. The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance or other special functions of the product, not only to enhance the bearing capacity of the equipment, but also to prolong its service life [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Strengthening Performance Optimization of Single Ball Impact Treatment by Evaluating Residual Stress

Yang

Wang

2022

Materials

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Residual stress plays an essential role in affecting the strengthening performance by a surface treatment. Studying the impact of a single ball on a target surface is the basis of shot peening technology in order to obtain the distribution of the residual stress, and to optimize the processing parameters. In this paper, a numerical model has been developed to represent single ball impacts on high manganese steel by considering different processing parameters. It was found that by increasing the ball diameter and impact velocity, the depth of maximum residual compressive stress and the depth of the residual compressive stress layer became significantly enlarged due to increasing kinetic energy of the impacting ball. It was also found from simulation that with an increase in ball impact angle, the maximum residual compressive stress, the depth of maximum residual compressive stress and the depth of the residual compressive stress layer were significantly improved; an exception was the surface residual compressive stress, which showed a decreasing trend. Moreover, by employing quantitative analysis with the entropy method, it was found that within the range of processing parameters considered in the simulation, it is recommended to use a ball with a diameter of 0.6 mm to impact the target, with a velocity of 80 m/s and an angle of 90° for the best strengthening performance.

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“…For hard brittle materials like RB-SiC ceramics, brittle material removal mode usually dominates the erosion process in terms of cracks and fractures, while by properly controlling the machining process the ductile material removal mode can be also found in removing hard brittle materials in terms of micro-cutting and micro-ploughing [14,15]. Rao et al [16] employed the Vickers indenter to scratch the RB-SiC ceramics at elevated temperatures and found that the material deformation and adhesive behavior enhanced the ductile material removal and the coefficient of friction at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Surface Morphology Evaluation and Material Removal Mechanism Analysis by Single Abrasive Scratching of RB-SiC Ceramics

You

Yuan

et al. 2022

Crystals

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Reaction-Bonded Silicon Carbide (RB-SiC) ceramics possessing excellent mechanical and chemical properties, whose surface integrities have an essential effect on their performance and service life, have been widely used as substrates in the core parts of aerospace, optics and semiconductors industries. The single abrasive scratching test is considered as the effective way to provide the fundamental material removal mechanisms in the abrasive lapping and polishing of RB-SiC ceramics for the best surface finish. In this study, a novel single abrasive scratching test with an increasing scratching depth has been properly designed to represent the real abrasive lapping and polishing process and employed to experimentally investigate the surface integrity regarding different scratching speeds. Three typical and different material removal stages, including the ductile mode, ductile–brittle transition mode and brittle mode, can be clearly distinguished and it is found that in the ductile material removal stage by increasing the scratching speed would inhibit the plastic deformation and improve its surface integrity. It is also found that in the ductile–brittle transition and brittle material removal stages, to increase the scratching speed would inhibit the plastic deformation due to the fast scratching speed that limits the time of plastic deformation on the target, but it also results in the increased length of lateral cracks with the increased scratching speed which can reflect that the size of brittle chips, like brittle fractures and large grain fragmentations, increases as the scratching speed increases. It can provide the references for the optimization of the abrasive lapping and polishing of RB-SiC ceramics with high efficiency and surface quality.

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Effects of pH Values and H2O2 Concentrations on the Chemical Enhanced Shear Dilatancy Polishing of Tungsten

Cited by 14 publications

References 36 publications

Glass Surface Modification Was Induced by the Combination of Coating Technology and Femtosecond Laser Assisted Chemical Etching

Glass Surface Modification Was Induced by the Combination of Coating Technology and Femtosecond Laser Assisted Chemical Etching

Strengthening Performance Optimization of Single Ball Impact Treatment by Evaluating Residual Stress

Surface Morphology Evaluation and Material Removal Mechanism Analysis by Single Abrasive Scratching of RB-SiC Ceramics

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