Micro-EDM process investigation and comparison performance of Al3O2 and ZrO2 based ceramic composites

指導老師 : 戴子堯

報告者 : 張瑋民

Outline

• Introduction• Experimental set-up• Process investigation• Material removal mechanism• Machining strategies and applications• Conclusions

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• Advanced technical ceramics find extensive applications in industry. Among them, aluminium oxide and zirconium oxide are the most widely employed for industrial machinery applications .

• Among them EDM provides several advantages. Due to the erosive action of electrical discharges generated between a tool and workpiece electrode, complex shapes and intricate profiles with high accuracy and surface quality are achievable, regardless the workpiece hardness.

Introduction

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Experimental set-up

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• The EDM tool applied in this research is a SARIX SX-100-HPM, specifically aimed for micro scale applications.

• WC solid rods ( Φ 300 μm) were used as tool electrodes. The rotational speed was set to 600 rpm and negative tool polarity was applied through all the experiments. Experiments were carried out in hydrocarbon oil .

• The test features were true trenches, realized by laterally sinking the tool electrode into ceramic bars.

• The surface topographies and cross sections were observed by means of a Scanning Electron Microscope

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Process investigation

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Material removal mechanism

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Machining strategies and applications

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• Both materials show a process behaviour similar to steel.

• Melting/evaporation is the main material removal mechanism.

• Al3O2–TiCN gives a lower surface roughness.

• The generation of subsurface cracks is also observed which may affect its durability during final applications. On the contrary, the subsurface damage induced into the ZrO2–TiN is negligible.

Conclusions

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Thank you for your attention

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