研究生: |
鄭宇翔 Yu-Shang-Cheng |
---|---|
論文名稱: |
以磁控濺鍍法製備鉬基金屬玻璃薄膜之銷對盤磨潤性質之研究 Preparation and tribological analysis of the Molybdenum based thin film metallic glasses deposited by magnetron sputtering process |
指導教授: |
周育任
Yu-Jen Chou |
口試委員: |
施劭儒
Shao-Ju Shih 周育任 Yu-Jen Chou 李伯軒 Bo-Shiuan Li |
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: | 2022 |
畢業學年度: | 110 |
語文別: | 中文 |
論文頁數: | 114 |
中文關鍵詞: | 鉬基金屬玻璃 、磁控濺鍍法 、X光繞射分析 、電子束掃描顯微鏡 、銷對盤磨耗試驗機 |
外文關鍵詞: | Molybdenum-based metallic glasses, Magnetron sputter process, X-ray diffraction analyzer, Electron beam scanning microscope, Pin on disk machine tester |
相關次數: | 點閱:503 下載:0 |
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金屬玻璃(Metallic glasses)之發展,自1960年代以來已有眾多學術研究歷史。由於金屬玻璃是採用快速冷卻凝固法而形成非晶態之金屬,同時兼具有高強度、高化學穩定性、抗磨耗等性質,可運用在眾多之產業器材上當作披覆之材料,能使披覆之材料達到抗腐蝕、抗磨耗之特性。其中,鋯基金屬玻璃(Zirconium based metallic glasses)是現今最為主流,並最常做為學術研究之金屬玻璃材料,其原因為鋯金屬與其他高強度金屬有較高之鍵結強度,能夠在高溫之環境下仍保有良好之非晶結構;並且可利用自身較大之原子半徑大小,驅使與其他元素混合時,還能保有不規則排列之特性,使得整體金屬玻璃在面對過冷液相區(super cooled liquid region)時,更能抑制結晶相而形成非晶結構。雖然鋯金屬有眾多之優點,但被作為薄膜披覆之磨耗來進行研究卻較為稀少,受制原因在於鋯基金屬玻璃維氏硬度(Hv)僅只有520GPa左右,相較於眾多研究之金屬氮化膜與氧化膜,硬度卻有明顯不足,以至於必須找尋機械強度更高之金屬。
本研究實驗則選用鉬(Molybdenum)作為金屬玻璃之主要合金元素,鉬相比於鐵、鋯、鈦和鎳等金屬,是具有更高之彈性模量與硬度,在常溫600℃下有良好之化學穩定性,也有最低之熱膨脹係數,以保護材料減少因受熱而產多餘之殘留應力。本實驗製程方面,利用磁控濺鍍法製備鉬基金屬玻璃(Mo45Ti30Ni15Zr7Co3),可使金屬薄膜披覆在基材上作為抗磨耗研究使用,此製程方法不但能使金屬薄膜表面更光滑細緻,在製程溫度室溫之環境中,使得薄膜沒有殘留缺陷形成,披覆至基材上更加緻密。此外,金屬玻璃薄膜可藉由X光繞射分析儀鑑定薄膜之非晶結構,也可應用電子束掃描顯微鏡觀測金屬薄膜之表面形貌。最後,經由銷對盤磨耗試驗機測試金屬薄膜之抗磨耗分析,作為探討鉬基金屬玻璃之潛在可用性。
The development of metallic glasses has a long history of scientific research in the 20th century. Due to metallic glasses is an amorphous metal formed by rapid cooling and solidification method, and have high strength, high chemical stability, and good wear resistance properties, and always be used as a coating material on many industrial equipments. However, Zirconium based metallic glasses are the most popular material nowadays and are most often used as metallic glass materials for academic research. Then, Zirconium can use its own larger atomic radius ratio to keep maintain the characteristics of irregular arrangement when mixing with other elements, so that the overall metallic glass can suppress the crystalline phase and easily form an amorphous structure when facing the super cooled liquid region. However, zirconium metal has many advantages, but it is seldom used for research on mechanical wear due to the hardness of zirconium is insufficient. Therefore, it is necessary to find a metal with higher mechanical strength.
Meanwhile, Molybdenum based metallic glasses could be used on own research because of higher young’s modulus, hardness and wear resistance than zirconium metal and perform good chemical stabilization below
IV
temperature 600℃. Molybdenum have the lowest thermal expansion coefficient α(4.8μm/Km) to protect the substrate and also could decrease excess residual stress.
In this experiment, the molybdenum-based metallic glass (Mo45Ti30Ni15Zr7Co3) is prepared by magnetron sputtering process, which can coat the metal film on the substrate for research of wear resistance. In the environment of room temperature, there is no residual stress and the coating on the substrate have a higher density in thin film. In addition, the amorphous structure of the metal glass thin film can be identified by an X-ray diffraction analyzer, and the surface morphology of the metal film can also be observed by an electron beam scanning microscope. Finally, the resistance of the metal film can be tested by a pin-to-disk machine tester. Wear properties analysis is as a probe into the potential ability of molybdenum-based metallic glasses.
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