Articolo in rivista, 2020, ENG, 10.1016/j.precisioneng.2020.06.002

Micro-EDM milling of zirconium carbide ceramics

D'Urso G.; Giardini C.; Lorenzi S.; Quarto M.; Sciti D.; Silvestroni L.

University of Bergamo, Department of Management, Information and Production Engineering, Dalmine, 24044, University of Bergamo, Department of Management, Information and Production Engineering, 24044, Dalmine, Italy, , Italy; University of Bergamo, Department of Engineering and Applied Sciences, Dalmine, 24044, University of Bergamo, Department of Engineering and Applied Sciences, 24044, Dalmine, Italy, , Italy; CNR-ISTEC, Institute of Science and Technology for Ceramics, Faenza, 48018, CNR-ISTEC, Institute of Science and Technology for Ceramics, 48018, Faenza, Italy, , Italy

Surface characteristics and machining performances of micro-pockets manufactured by ?EDM as a function of different process conditions are studied in this paper. The micro-pockets were obtained using different combinations of process parameters on different ultra-high temperature ceramics (UHTCs) with the same base matrix (ZrC) and different volume fraction of the second phase (MoSi). This work presents an analysis of the process performances with different machining approaches, from pre-roughing down to fine-finishing. Microstructure analysis of the as-sintered and machined materials was conducted to identify materials modification due to the electrical discharges. A removing material mechanism during the ?EDM process has been hypothesized, correlating the ED-machined surface structure and the main process performances.

Precision engineering 65 , pp. 156–163

Keywords

Micro-EDM, Milling, Carbides.

CNR authors

Sciti Diletta, Silvestroni Laura

CNR institutes

ISSMC – Istituto di Scienza, Tecnologia e Sostenibilità per lo Sviluppo dei Materiali Ceramici