Effect of Fracture Toughness of Sapphires on EDM Properties

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Apiwat Muttamara
Thammasat University (Rangsit Campus), Khlong Luang, Pathum Thani 12121
Yasushi Fukuzawa
Nagaoka University of Technology, Japan
Naotake Mohri
Tokyo University, Japan
Takayuki Tani
Tsukuba College Technology, Japan

Abstract

Electrical Discharge Machine (EDM) is utilized for drilling electrical conductive materials.Recently, insulating ceramics materials can be machined successfully with the assisting electrodemethod (AEM). Some ceramics recognized as hard materials, especially the high purity alumina(99.99%) are difficult to machine with this method because the conductive layer easily peels offduring the process. Moreover, fracture toughness of the alumina single crystal or sapphire affectmachining properties. Investigation of machining properties comparing with crystallographic planes, C(0001), A(1120) and R(1102) were carried out. The fracture toughness of each plane was found toaffect the conductive layer fabrication and cracks around the EDM holes corresponding to the EDMproperties.

Article Details

Issue
Vol. 29 No. 1 (2006): January - March
Section
Technical Report
Author Biographies

Apiwat Muttamara, Thammasat University (Rangsit Campus), Khlong Luang, Pathum Thani 12121

Lecturer, Department of Industrial Engineering.

Yasushi Fukuzawa, Nagaoka University of Technology, Japan

Professor, Department of Mechanical Engineering.

Naotake Mohri, Tokyo University, Japan

Professor, Department of Precision Machinery Engineering Manufacturing System.

Takayuki Tani, Tsukuba College Technology, Japan

Assistant Professor, Department of Mechanical Engineering.