超音波輔助電泳沉積拋光鐵基金屬玻璃放電面之研究;The Study of EDMed Surface of the Fe-based Metallic Glass Polishing by Ultrasonic Vibration-assisted Electrophoretic Deposition

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Title:	超音波輔助電泳沉積拋光鐵基金屬玻璃放電面之研究;The Study of EDMed Surface of the Fe-based Metallic Glass Polishing by Ultrasonic Vibration-assisted Electrophoretic Deposition
Authors:	林琴南;Lin, Cin-Nan
Contributors:	機械工程學系
Keywords:	放電加工;金屬玻璃;超音波輔助;拋光;電泳沉積;electrical discharge machining;metallic glass;ultrasonic vibration assisted;polishing;electrophoretic deposition
Date:	2022-05-09
Issue Date:	2022-07-14 01:20:59 (UTC+8)
Publisher:	國立中央大學
Abstract:	鐵基金屬玻璃因為其非晶特性而具有高機械強度及抗腐蝕能力等優勢，然而也因其具有硬脆特性，在採用傳統機械拋光法進行放電加工後材料表面拋光時，容易發生材料表面破裂的情形。為了克服前述困難點，本研究係採用超音波輔助電泳沉積拋光(Ultrasonic Vibration-assisted Electrophoretic Deposition Polishing, UAEPDP)，進行鐵基金屬玻璃放電面拋光之研究，設定之實驗單因子為電泳沉積電壓、拋光時間、超音波功率等級、磨輪荷重及磨輪轉速，探討各項因子與表面粗糙度之關係，並在加工後針對試片材料以光學顯微鏡(OM)及掃描式電子顯微鏡(SEM)進行表面觀察，再以X射線繞射儀(XRD)進行相鑑定分析，探討試片加工後有無產生再結晶現象。實驗結果顯示，當採用參數組合電泳沉積電壓25 V、拋光時間10 min、超音波功率等級Level 10、磨輪荷重120 g及磨輪轉速700 rpm，可得最佳之表面粗糙度0.044 μmRa，相較於無添加電泳沉積者及無添加超音波輔助者分別下降73.0%及67.9%，顯示應用超音波輔助電泳沉積拋光機制確能有效改善鐵基金屬玻璃放電面之表面品質，且試片經過拋光後仍為非晶狀態，證實超音波輔助電泳沉積拋光可應用於鐵基金屬玻璃表面拋光。 ;Fe-based metallic glass possesses high mechanical strength and high anti-corrosion ability due to its amorphous property. This unique property, however, leads to hard-brittle behavior, causing surface fracture during conventional polishing of the EDMed material surface. To solve this difficulty, ultrasonic vibration-assisted electrophoretic deposition polishing (UAEPDP) was adopted in this study to conduct the polishing on the EDMed surface of the Fe-based metallic glass. The influences of experimental parameters on surface roughness were investigated, including electrophoretic deposition voltage, polishing time, ultrasonic vibration power, loading, and rotation speed. The surfaces of experimental specimens after polishing were observed with the optical microscope (OM) and scanning electrical microscope (SEM). The phase properties were measured with X-ray diffraction patterns (XRD) to evaluate the recrystallization phenomenon. According to the experimental results, the surface roughness of 0.044 μmRa could be obtained by executing the combination of the parameters, including electrophoretic deposition voltage of 25 V, polishing time of 10 min, ultrasonic vibration power of level 10, loading of 120 g, and rotation speed of 700 rpm. This surface roughness was 73.0% lower than the process without electrophoretic deposition and 67.9% lower than the process without ultrasonic vibration individually. The result indicated that the mechanism of UAEPDP could certainly improve the surface quality of the Fe-based bulk metallic glass after EDM, and the amorphous state of the specimen after polishing verified that UAEPDP could be applied to the surface finishing of Fe-based bulk metallic glass.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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