Advances in understanding of damage formation during laser-assisted milling of ZnO-based varistor ceramics

نویسندگان

چکیده

Zinc oxide (ZnO)-based varistor ceramic is a hard-to-machine material. Its microstructure, developed for its electrical properties, results in extremely low fracture toughness. Therefore, the current state-of-the-art machining this material lapping. In present work, laser-assisted milling (LAMill) of ZnO ceramics was evaluated with systematic approach to allow new insights and advance understanding damage formation during A strategy machine workpieces along edge studied. Additionally, transient analytical thermal model accurately predict laser-induced temperatures near workpiece without excessive use computational power, predictions were experimentally verified. novel evidence machining-induced mathematical description ideal machined surface also designed tested. It found that at higher propagation intergranular fractures inhibited. Another mechanism based on porosity contributing more instances crack initiation has been identified. To reliably extent surface, analysis extended by covering effects two identified influential process parameters: feed per tooth, fz, temperature to-be-cut material, T. By adjusting these parameters, successfully controlled minimized fz = 0.18 mm T 380 °C, achieving 44 % reduction compared conventional same parameters.

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ژورنال

عنوان ژورنال: Journal of Manufacturing Processes

سال: 2022

ISSN: ['1526-6125', '2212-4616']

DOI: https://doi.org/10.1016/j.jmapro.2022.11.008