Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals

Li, Chen; Piao, Yinchuan; Meng, Binbin; Hu, Yuxiu; Li, Longqiu; Zhang, Feihu

doi:10.1016/j.ijmachtools.2021.103827

Cited by 185 publications

(43 citation statements)

References 30 publications

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“…Moreover, it is also interesting to note from Figure 2 c–f that, in the latitude and longitude distribution of diamonds with a gap of concentric circles of 40 mm, the petal-shaped distribution of particle trajectories on the targe surface was more obvious than that with a gap of concentric circles of 20 mm. To sum up, all the arraying forms of diamonds on the lapping plate as discussed in this study could realize the particle trajectories moving on the target surface with fractal characteristics, such that it could result in the fixed abrasive lapping of bipolar plates with deterministic surface microstructures, but the optimized design is still necessary to be explored by quantitatively evaluating the uniformity of the particle trajectories on the target surface according to the material removal mechanisms caused by the abrasive [ 23 , 24 , 25 ].…”

Section: Numerical Modeling Of the Particle Trajectories On Target Su...mentioning

confidence: 99%

Fractal Characteristic-Induced Optimization of the Fixed Abrasive Lapping Plate in Fabricating Bipolar Plate of Proton-Exchange Membrane Fuel Cells

2022

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Purpose: A bipolar plate with fractal-characterized microstructures can realize intelligent energy transmission and obtain a high efficiency of proton-exchange membrane fuel cells. In this paper, fixed abrasive lapping technology is proposed to fabricate a surface microstructure on a bipolar plate with fractal characteristics. Methodology: The kinematics of the fixed abrasive lapping process was developed and employed to numerically investigate the particle trajectories moving on the target surface by considering the different arraying forms of diamonds on the lapping plate. Findings: It was found from an analysis of both the uniformity and the fractal characteristics that the arraying form of diamonds on the lapping plate, with the distribution of latitude and longitude with an angle of 30° and a gap of concentric circles of 40 mm with a minimum radius of 70 mm and maximum radius of 190 mm, can be used to obtain the best uniformity and fractal characteristics in the fixed abrasive lapping of a bipolar plate. Conclusions: The distribution of the latitude and longitude of 40° and 30° considered in this study is expected to realize the best machining performance in the bipolar plate and present good cell performance.

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Section: Numerical Modeling Of the Particle Trajectories On Target Su...mentioning

confidence: 99%

Fractal Characteristic-Induced Optimization of the Fixed Abrasive Lapping Plate in Fabricating Bipolar Plate of Proton-Exchange Membrane Fuel Cells

2022

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“…Xiao [6] et al analyzed the fatigue performance of aero-engine blades and found that the surface roughness value has a great influence on the fatigue life of the blade. Li [7] et al explored the influence of abrasive particles on surface morphology and roughness. Belt grinding has the characteristics of good flexibility and good versatility, and the surface of the workpiece is not easy to burn during processing.…”

Section: Introductionmentioning

confidence: 99%

Belt grinding method considering outer profile and inner wall thickness

Huang¹,

Wei²,

Xiao³

et al. 2022

J. Phys.: Conf. Ser.

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Increasing thrust-to-weight ratio is the goal pursued by aero-engines. Aero-engine blades are the core components of aero-engines. In order to reduce the weight and improve the thrust-to-weight ratio, the cavity structure is gradually applied to aero-engine blades. The constraints of the outer contour and the inner wall thickness of the cavity structure blade make its trajectory planning difficult, which seriously affects its surface roughness and profile accuracy. In this study, proposes a titanium alloy blade surface machining method based on belt grinding, which is constrained by two dimensions of contour and wall thickness, and the process parameters of titanium alloy material specimens are studied. The obtained parameters are applied to the blade grinding process, the grinding trajectory is planned, and finally parameters of the blade are tested. The processing and testing results verify the effectiveness of the method in this paper.

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“…Due to the distinct mechanical and chemical properties of high erosion and wear resistance, high thermal conductivity, high chemical inertness and low thermal expansion, Reaction-Bonded Silicon Carbide (RB-SiC) ceramics have become the primary structure and substrate materials necessary for the aerospace, optics and semiconductors industries [1][2][3]. However, the inherent characteristics of high hardness and low fracture toughness bring large challenges in the machining of RB-SiC ceramics, and the surface integrity has an essential influence on their performance and service life in practice.…”

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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Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals

Cited by 185 publications

References 30 publications

Fractal Characteristic-Induced Optimization of the Fixed Abrasive Lapping Plate in Fabricating Bipolar Plate of Proton-Exchange Membrane Fuel Cells

Fractal Characteristic-Induced Optimization of the Fixed Abrasive Lapping Plate in Fabricating Bipolar Plate of Proton-Exchange Membrane Fuel Cells

Belt grinding method considering outer profile and inner wall thickness

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

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