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http://dx.doi.org/10.3740/MRSK.2006.16.3.168

Surface Modification and Heat Treatment of Ti Rod by Electro Discharge  

Byun, C.S. (Department of Materials Engineering, Hanbat University)
Oh, N.H. (Department of Advanced Materials Engineering, Sejong University)
An, Y.B. (Department of Advanced Materials Engineering, Sejong University)
Cheon, Y.W. (Department of Advanced Materials Engineering, Sejong University)
Kim, Y.H. (Department of Advanced Materials Engineering, Sejong University)
Cho, Y.J. (Department of Advanced Materials Engineering, Sejong University)
Lee, C.M. (Department of Advanced Materials Engineering, Sejong University)
Lee, W.H. (Department of Advanced Materials Engineering, Sejong University)
Publication Information
Korean Journal of Materials Research / v.16, no.3, 2006 , pp. 168-172 More about this Journal
Abstract
Single pulse of 2.0 to 3.5 kJ from $150{\mu}F$ capacitor was applied to the cp Ti rod for its surface modification and heat treatment. Under the conditions of using 2.0 and 2.5 kJ of input energy, no phase transformation has been occurred. However, the hardness and tensile strength decreased and the elongation increased after a discharge due to a slight grain growth. By using more than 3.0 kJ of input energy, the electro discharge made a phase transformation and the hardness at the edge of the cross section increased significantly. The Ti rod before a discharge was lightly oxidized and was primarily in the form of $TiO_2$. However, the surface of the Ti rod has been instantaneously modified by a discharge into the main form of TiN from $TiO_2$. Therefore, the electro discharge can modify its surface chemistry in times as short as $200{\mu}sec$ by manipulating the input energy, capacitance, and discharging environment.
Keywords
Ti; electro discharge; heat treatment; surface modification; XPS;
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