| 研究生: |
吳汶蒨 Wu, Wen-Chien |
|---|---|
| 論文名稱: |
添加不同氮氣和乙炔通量對高熵合金鍍層機械、抗腐蝕與磨潤性質之影響並應用於鎳基合金銑削試驗 Mechanical, anti-corrosion and tribological properties of high entropy coatings with various nitrogen and acetylene flux and applications on nickel-based alloy milling. |
| 指導教授: |
蘇演良
Su, Yen-Liang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2021 |
| 畢業學年度: | 109 |
| 語文別: | 中文 |
| 論文頁數: | 72 |
| 中文關鍵詞: | 高熵合金鍍層 、磨潤性質 、機械性質 、抗腐蝕性質 、鎳基合金銑削 |
| 外文關鍵詞: | High entropy alloy, Tribology, Mechanical properties, Nickel-based alloy milling |
| 相關次數: | 點閱:227 下載:0 |
| 分享至: |
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目前國內外對於高熵合金鍍層多探討其結構與基本性質,較少研究對於抗腐蝕性質、磨潤性質及實際應用上,因此本研究為提供一高熵合金資料庫,將對所有性質進行全面性分析及比較,此外因高熵合金高溫穩定性等特色,於實際應用上,本研究選擇將其被覆於刀具,並用於切削鎳基合金。
本研究通過射頻偏壓DC非平衡磁控濺鍍製備含氮及含氮碳AlCrNbSiTi高熵合金鍍層,因應不同的實驗主軸,共分為三階段進行實驗。第一階段探討在不同氮通量下,鍍層機械性質、磨潤性質與抗腐蝕性質之變化,接著比較實驗結果,找出擁有最佳性能之鍍層,而第二階段以第一階段之最佳鍍層進一步添入乙炔,探討碳元素的添加及不同碳含量對鍍層性能的影響,第三階段則將前兩階段之最佳鍍層及未通氣體之高熵合金鍍層應用於鎳基合金銑削測試中,並為了比較,於此階段尚加入未鍍層之刀具、一般市面商用刀具(鍍製TiAlN)進行。
第一階段結果顯示,氮氣通量的增加對於鍍層XRD結構無明顯變化,皆為非晶相,但對於鍍層硬度、磨潤性質與抗腐蝕性質卻有著顯著的提升。在硬度方面,當氮氣通入15 sccm以上時,其硬度會高於40 GPa,這是由於金屬氮化物鍵結的產生和固溶強化現象導致;而在磨潤性質與抗腐蝕性質方面,皆以高乙炔通量(15 sccm)之鍍層擁有最佳性能,它具有最低磨耗深度、磨耗率和腐蝕電流,其中磨耗深度及磨耗率分別為0.24 µm及0.4×10-6 mm3/N·m,原因為其具有高的H/E比、H3/E2比和最低的摩擦係數,腐蝕電流顯示0.27×10-7 A/cm2,導因於非晶結構、牢固的金屬氮化物鍵結和優異的附著性,因此綜合上述,第二階段將以氮氣通量15 sccm作為研究基底。
第二階段結果說明,通入乙炔後鍍層結構發生明顯變化,XRD方面顯示添入乙炔後之鍍層結構都轉為FCC結構,且綜合評比鍍層各性能,包括機械性質、磨潤性質與抗腐蝕性質,皆較第一階段來的差,此外,經由實驗結果可見,在添入乙炔通量後,鍍層機械性質與抗腐蝕性質隨乙炔通量的上升而下降,主要原因與晶粒粗化及附著性的降低有關,於磨潤性質方面則呈相反趨勢,當乙炔通入12 sccm時擁有最佳性能,其磨耗率顯示為1.8×10-6 mm3/N·m。
最後在第三階段鎳基合金銑削測試中,本實驗鍍層刀具與市售商用刀具相比來的差,其刀具磨耗量皆高於商用刀具,此原因推測與濺鍍時的高偏壓有關,高偏壓導致濺鍍時刀刃受損,不利於後續切削行為,此外比較所有鍍層刀具,以N15鍍層被覆之刀具有最優異之切削性能,這個結果符合前兩階段之研究趨勢。
The AlCrNbSiTi high entropy alloy coatings were prepared by unbalanced magnetron sputtering. This study determines the effect of the nitrogen flux (0 to 20 sccm) and acetylene (6 to 12 sccm) on the phase composition, microstructure, mechanical properties, tribological properties, anti-corrosion property and machining performance of the coatings. The coatings were named as Nx and N15-CHy. Among them, the “x” in Nx is defined as nitrogen flux, and the “y” in N15-CHy is represented as acetylene flux. The nitride coatings all exhibit amorphous structure because of high mixing entropy effect and the large atomic-size difference. With increasing nitrogen flux, the hardness increases and reaches maximum values of 43.7 GPa (N15). Besides, in the wear tests and electrochemical tests, the coating with nitrogen flux of 15 sccm has the best performance. It exhibits the lowest wear rate (0.4×10-6 mm3/N·m) and corrosion current density (0.27×10-7A/cm2). After adding acetylene flux, all the performances decrease. Finally, the milling tests prove that the suitable addition of nitrogen (15 sccm) during the deposition process is beneficial in enhancing the machining performance of the coatings. Compared with other tools, it has the smallest tool wear depth after milling nickel-based alloys. From this, it can be seen that the coating with nitrogen flux of 15 sccm has great potential in cutting applications.
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