| ZHANG Shou-kui,WANG Dan-hong,LIANG Yan-de.Surface Modification by Electrical Discharge Machining using Industrial Si as Tool Electrode[J],36(2):29-31 |
| Surface Modification by Electrical Discharge Machining using Industrial Si as Tool Electrode |
| Received:October 21, 2006 Revised:April 10, 2007 |
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| DOI： |
| KeyWord:EDM Si electrode Corrosion resistance Powder-mixed technology |
| Author | Institution |
| ZHANG Shou-kui |
Dalian University of Science and Technology, Dalian , China |
| WANG Dan-hong |
Dalian University of Science and Technology, Dalian , China |
| LIANG Yan-de |
Dalian University of Science and Technology, Dalian , China |
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| Abstract: |
| The surface modification by electrical discharge machining ( EDM) using Si as tool electrode for 45 steel and nodular iron was presented. The experimental equipment is EDM7125 , and common kerosene is used as dielectric fluid. The tool electrode material is industrial Si with purity 99. 60-/o . The microstructure of the workpieces surface was analyzed by OM and SEM. Furthermore, quantitative analysis of element content has been carried out by EDS. The corrosion resistance and the cohesion strength of the modified layer were also studied. Results of experiments show that the modified layer with high Si content, nearly reaches 160-/o , occurs on the EDMed workpieces surface. In addition, on the whole, graphite doesnt be flushed away. But one feature found on EDMed surfaces is a little of cracks, especially cracks are easy to initiating and propagating at graphite/matrix interface. The modified layer has high bonding strength , and disbanding and crack doesnt occur after permanent distortion. And the sample has better corrosion resistance. However, a large number of Si powders occur between the two polarities when utilizing Si as tool electrode , especially positive polarity machining. Besides, appropriate machining parameters will obtain better surface quality. |
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