Papers by Keyword: Micro-Morphology

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Authors: Hong Yu Zhu, Ying Li
Abstract: The technology of hard whirling is a kind of advanced manufacturing technology which integrates high efficiency, high precision and energy saving as a whole and attracts wide attention in machining field around home and abroad. Through studying on experiment of hard whirling machining on rolling bearing steel which has average hardness at 63.5HRC, this article focuses on different understanding of saw-tooth chips, illustrates the essential difference between macro- morphology and micro-morphology of saw-tooth chips, analyzes macro- morphology of saw-tooth chips with their corresponding machining parameters and finally raises a new solution to implement online monitoring on hard whirling machining.
Authors: Dan Song, Fei Huang, Lin Chen, Dong Dong Jia, Guang Lu Li, Jia Lei Lin, Jian Yuan Li, Wenyuan Gao
Abstract: Morphology and micro-structure of the pyrite whiskers synthesized by hydrothermal process were systematically observed by using transmission electron microscope. The results indicated that whiskers revealed various morphologies, including smooth, rough and branched. Combined with the hydrothermal reaction conditions, the causes of whiskers morphology diversity is: straight smooth whiskers grow in the condition of stable concentration, temperature, and interface state; whiskers with rough surface and complex morphology grow in the condition of unstable concentration, temperature, and interface state; the same level branching structure rotation was the result of hydrothermal disturbance; nano-crystalline grains formed after the main growth of the whiskers.
Authors: Gang Sun, Yan Fang
Abstract: The micro-morphology of the moth wing surface was characterized by a scanning electron microscope (SEM). The contact angle (CA) and sliding angle (SA) of water droplet on the wing surface were measured by an optical CA meter. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surface is of superhydrophobicity (CA 143~156°) and low adhesion (SA 1~4°), and displays multiple-dimensional rough micro-morphology. The scales play a crucial role in the complex wettability of the wing. The average rate of CaCO3 pollution removal from the wing surface is as high as 87.3%. There is a positive correlation (R=0.8777) between pollution removal rate and roughness index of the wing. The cooperation of chemical composition and micro-morphology contributes to the special wettability and outstanding self-cleaning performance of the wing. The moth wing can serve as a template for biomimetic design and preparation of novel interfacial material with multi-functions.
Authors: Chang He Li, Zhan Rui Liu, Guang Qi Cai
Abstract: Based on the modeling and experiments concerning the surface roughness in abrasive jet finishing with grinding wheel as restraint, the effect of abrasive size, abrasive fluid concentration, machining cycle, wheel velocity and carrier fluid on machined surface quality was investigated. Surface grinder M7120 was employed in a jet machining experiment conducted with W18Cr4V and 40Cr materials, profilometer TALYSURF was used to measure the micro geometrical parameters after machining, and SEM was used to observe surface micro-morphology. Experimental results show that with W7 Al2O3 powder at the mass fraction of 10% and antirust lubricating liquid being adopted in jet machining for 20 to 30 cycles, not only high surface shape precision can be kept or obtained, but also defect-free machined surface with the roughness of Ra0.15~1.6µm can be obtained with high efficiency. Experimental observation and experimental results proved that the experimental results agree well with a mechanism-based machining model.
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