研究生: |
邱紹賢 Shao-Hsien Chiu |
---|---|
論文名稱: |
非平衡磁控濺鍍製程中氧氣流量對奈米晶氮氧化鈦薄膜合成及性質特徵之影響研究 Synthesis and Characterization of Nano-crystalline TiNxOy Thin Films by Unbalanced Magnetron Sputtering System (UBMS) |
指導教授: |
喻冀平
Ge-Ping Yu 黃嘉宏 Jia-Hong Huang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 英文 |
論文頁數: | 97 |
中文關鍵詞: | 非平衡磁控濺鍍製程 、氮氧化鈦薄膜 、本質腐蝕 、晶體織構轉換 |
外文關鍵詞: | Unbalanced Magnetron Sputtering System, TiNxOy thin film, intrinsic corrosion, texture evolution |
相關次數: | 點閱:3 下載:0 |
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本實驗成功地利用非平衡磁控濺鍍法鍍著奈米晶的氮氧化鈦薄膜鍍著於p型(111)矽晶片上。主要研究氧氣流量 (自0至1.5 sccm,固定氮氣流量為 2.5 sccm) 對氮氧化鈦薄膜的成分、結構與性質之影響。隨著氧氣流量的增加,藉由X光光電子儀 (XPS) 所量測到氮氧化鈦薄膜的氧含量顯著增加。當薄膜氧含量增加時,薄膜的顏色由金黃色改變為紫色,最後是明亮的綠色;由場發射掃描式電子顯微鏡所觀察到的微結構也有明顯的改變。觀察X光繞射圖發現,薄膜氧含量大於12 at% 時,其氮氧化鈦薄膜的優選方向會從氮化鈦薄膜之 (111) 改變至 (200),且當薄膜氧含量大於32 at % 時,氮化鈦薄膜會發生相轉換至單斜的五氧化三鈦薄膜。在氮氧化鈦薄膜中,當氧含量在7 at % 至25 at% 時,其硬度沒有太多的改變,直到薄膜氧含量大於25 at%,其硬度會隨著薄膜氧含量上升而逐漸下降至五氧化三鈦薄膜的值11.6 GPa。本研究中使用光學方法量測氮氧化鈦薄膜的整體殘留應力,並使用modified XRD sin2Ψ的方法加以比較其兩種方法的差異。其薄膜的殘留應力也與薄膜硬度的趨勢相似,會隨著薄膜氧含量上升而逐漸下降至五氧化三鋯薄膜的值 -1.7 GPa。另一方面,本研究鍍著出的薄膜電阻率非常接近單晶氮化鈦薄膜,且發現隨著薄膜氧含量的增加,薄膜的電阻率非常明顯地上升。由於氮氧化鈦薄膜為奈米晶粒,因此晶粒大小並不是影響電阻率的主要因素。在1N H2SO4溶液的動態極化掃瞄實驗裡,本研究也成功的量測出氮氧化鈦薄膜的本質腐蝕電位和本質腐蝕電流,其本質腐蝕電位量測皆為正值(相對於飽和氯化銀電極),並且發現氮氧化鈦薄膜的本質腐蝕電位與薄膜中的TiN 共價鍵含量有著線性的關係,因此可知其薄膜的本質腐蝕電位與薄膜中的成分有關,並且從非常低的薄膜本質腐蝕電流得知,其本質腐蝕電流為主要決定薄膜抗腐蝕性質的因素。
The functional colored hard coating has been developed to offer more advantages for decorations in recent years. A favored class of material is TiNxOy thin film which has substantial attentions by a variety of colorations and available mechanical properties. In this study, TiNxOy thin films were deposited by unbalanced magnetron sputtering with addition of oxygen and nitrogen at 350℃. The results show that the film coloration changes from warmer golden to vivid green and the hardness value is ranged from 20.8 to 11.6 GPa as the oxygen content was increased from 7 to 60 at %. The compressive residual stress of TiNxOy thin films was measured by modified XRD sin2Ψ and optical methods. The compressive stress shows that a gradual relief of stress from -4.75 to -1.10 GPa with the increasing oxygen content. Distinct change in microstructure is observed in SEM cross-section microscopy that the columnar structure further develops to cone shape of coarse columnar structure when the oxygen content increases from 39 to 60 at %. It is noted that the electrical resistivity of TiNxOy thin film for 7 at % oxygen content was measured only 20.7μΩ-cm which approaches to that of the single crystalline TiN film (15μΩ-cm). The texture evolution exhibits a significant transition from (111) preferred orientation to (200) dominated orientation for films between 12 at % and 32 at % oxygen content. Furthermore, the intrinsic corrosion potential of TiNxOy thin films is determined to have superior corrosive resistance in 1N H2SO4 solution since the measured Ecorr is at least + 60 mVAg/AgCl. The TiNxOy thin film maintains a suitable mechanical property for decorative applications, and the corrosion resistance can survive the attack of severe environment.
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