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Accession Number ADA567674
Title Process Characterization of Electrical Discharge Machining of Highly Doped Silicon.
Publication Date Jun 2012
Media Count 128p
Personal Author G. A. Crawford
Abstract Electrical Discharge Machining (EDM) is an advanced machining process that removes material via thermal erosion through a plasma arc. The machining process is accomplished through the application of high frequency current (typically through a fine wire or some other electrode) to a conductive workpiece. The electrode is physically separated from the workpiece by some small distance and the potential difference is commonly discharged through an insulating dielectric material such as deionized water or oil. This short duration application of current produces a spark across the gap between the electrode and workpiece, causing vaporization and melting of local material in both the electrode and workpiece. The EDM process is most frequently used for conductive substrates (i.e. metals); however, research has shown that the process may be successfully used on semiconductor substrates such as doped silicon wafers1. The purpose of this research was to characterize the EDM process using Design of Experiments (DOE) statistical methodology on highly doped silicon wafer workpieces for material removal rate (MRR) and surface roughness (Ra) for both Wire EDM (WEDM) and die sinker EDM machines. Once process characterization was completed, confirmation testing was conducted for each machine. The applied spark energy had a significant impact on processing speed for both machines as expected, with the WEDM processing also heavily dependent on selected control speed. Surface roughness was also found to be highly dependent on spark energy for both machines. Evaluation of minimum obtainable feature sizes for some specific geometries as well as evaluation of various effects on the processing of silicon were also conducted.
Keywords Doping
Edm(Electrical discharge machining)
Electric discharges
Electrodes
Machining
Silicon
Surface roughness


 
Source Agency Non Paid ADAS
NTIS Subject Category 41E - Manufacturing, Planning, Processing & Control
94G - Manufacturing Processes & Materials Handling
Corporate Author Massachusetts Inst. of Tech., Cambridge.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1309
Contract Number N/A

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