研究生: |
張朝瑀 Chao-Yu Chang |
---|---|
論文名稱: |
具研磨液之單晶矽結合能及奈米切削力與溫度分佈估算 Temperature distribution and cutting force with estimation of bonding energy of single-crystal silicon with slurry effect |
指導教授: |
林榮慶
Zone-Ching Lin |
口試委員: |
許覺良
Jue-liang Xu 傅光華 KUANG-HUA FUH 成維華 Wei-Hua Chieng 王國雄 Kuo-Shong Wang |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2017 |
畢業學年度: | 105 |
語文別: | 中文 |
論文頁數: | 128 |
中文關鍵詞: | 比下壓能 、原子力顯微鏡 、單晶矽基板 、化學反應層 、莫氏勢能之結合能 |
外文關鍵詞: | specific down force energy, atomic force microscopy, single-crystal silicon substrate, chemical reaction layer, bonding energy |
相關次數: | 點閱:249 下載:0 |
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摘要
本研究先以下壓力對未浸泡研磨液的單晶矽基板進行原子力顯微鏡(AFM)加工,得出單晶矽基板未浸泡研磨液的比下壓能值。然後再利用較小的下壓力對浸泡室溫研磨液之單晶矽進行AFM加工實驗,以比下壓能理論,得出浸泡室溫研磨液之單晶矽化學反應層範圍內的比下壓能值。並用計算浸泡室溫研磨液之化學反應層厚度的理論模式及實驗方法,獲得浸泡室溫研磨液單晶矽之化學反應層厚度。且在化學反應層厚度內的固定下壓深度情況下,利用比下壓能公式,可推導出在此固定下壓深度之浸泡室溫研磨液單晶矽之下壓力大小。本研究提出創新的計算受室溫研磨液化學反應影響之單晶矽莫氏勢能之結合能計算方法。此計算方法先假設單晶矽之莫氏勢能受研磨液影響之參數α、r0不變,僅有結合能D值改變。所以初始預測D值為以未浸泡研磨液單晶矽之莫氏勢能結合能D值做測試,利用逆解法的概念,先假設初始之D值,再用分子靜力學奈米切削模式模擬出固定下壓深度的下壓力,再與已受室溫研磨液影響之單晶矽比下壓能值所計算出的固定下壓深度的下壓力做比較。依所得之兩個下壓力比較之差距,用最佳化觀念逐步調整莫氏勢能的D值,再用分子動力學奈米切削模式模擬出固定下壓深度的不同D值之下壓力。並將前述兩方法計算所得之兩下壓力的差距的比值應小於收斂值當目標函數,當目標函數達到收斂值,則假設算出的D值為單晶矽受浸泡室溫研磨液化學反應影響之莫氏勢能的結合能D值。本研究最後再用計算所得受室溫研磨液影響之單晶矽莫氏勢能結合能D值,用分子靜力學奈米切削模式模擬切削單晶矽的切削力與下壓力,並與比下壓能法計算所得之受室溫研磨液影響的切削力與下壓力作比較,以驗證所得之受室溫研磨液影響之莫氏勢能的結合能D值為合理。此外本研究亦求用受室溫研磨液影響的莫氏勢能結合能D值,進行分子靜力學奈米切削程式模擬奈米切削單晶矽之等效應力及等效應力分佈,以及因摩擦熱源及塑性熱源產生的溫度提升和溫度分佈,並進一步和以往文獻所做的切削未浸泡研磨液的單晶矽的結果做比較分析。
Abstract
The paper uses down force to perform atomic force microscopic (AFM) machining of single-crystal silicon substrate unsoaked in slurry, and obtains the specific down force energy (SDFE) in the range of the single-crystal silicon substrate unsoaked in slurry. After that, the paper uses a smaller down force to conduct AFM machining experiment of the single-crystal silicon soaked in room-temperature slurry. Using SDFE theory, the paper acquires the SDFE of the single-crystal silicon’s chemical reaction layer soaked in room-temperature slurry. The paper also uses the theoretical model and experimental method for calculating the thickness of the chemical reaction layer soaked in room-temperature slurry, to obtain the thickness of the chemical reaction layer of the single-crystal silicon soaked in room-temperature slurry. Under the circumstances that the pressing depth is fixed within the thickness of chemical reaction layer, the paper SDFE equation to derive the down force size of the single-crystal silicon soaked in room-temperature slurry at such a fixed pressing depth. The paper proposes an innovative method for calculating the bonding energy of Morse potential energy for the single-crystal silicon affected by chemical reaction of room temperature slurry. For this calculation method, it is firstly supposed that the parameters α and r0 for Morse potential energy of single-crystal silicon to be affected by slurry is unchanged, and only the bonding energy D value is changed. Therefore, it is initially predicted that D value is the bonding energy D value of Morse potential energy of the single-crystal silicon unsoaked in slurry, and is used for testing. Employing the concept of inverse method, the paper firstly lets the initial value be D, and then uses molecular statics nanocutting model to simulate the down force at a fixed pressing depth, and then compares it with the down force at a fixed pressing depth calculated by the SDFE of the single-crystal silicon affected by room temperature slurry. Based on the difference in down force resulted after comparison, the paper uses optimization concept to step by step adjust the D value of Morse potential energy, and then uses molecular statics nanocutting model to simulate the down forces of the different D value at a fixed pressing depth and takes the ratio of distance between the two down forces calculated by the above two methods, which should be smaller than the convergence value, as the objective function. When objective function reaches the convergence value, it is supposed that the calculated D value is the bonding energy D value of Morse potential energy of the single-crystal silicon affected by the chemical reaction when being soaked in room temperature slurry. The study finally uses the calculated bonding energy D value of Morse potential energy of the single-crystal silicon affected by room temperature slurry, and uses molecular statics nanocutting model to simulate the cutting force and down force for cutting single-crystal silicon. The paper also compares them with the cutting force and down force affected by room temperature slurry, which are calculated by SDFE method. is tested and verified that the acquired bonding energy D value of Morse potential energy affected by room temperature slurry is reasonable. Besides, the paper also uses the bonding energy D value of Morse potential energy affected by room temperature slurry to simulate, using molecular statics nanocutting equation, the equivalent stress for nanocutting of single-crystal silicon and distribution of equivalent stress, as well as the temperature rise and temperature distribution caused by friction heat source and plastic heat source. Furthermore, the paper makes analysis after comparing with the cutting results of the single-crystal silicon unsoaked in slurry achieved in the past literature.
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