| 研究生: |
張書銘 Zhang, Shu-Ming |
|---|---|
| 論文名稱: |
大氣電漿熔射不同比例及奈米結構氧化鋁-氧化鈦塗層磨潤性質研究 Tribological performance of APS Al2O3-TiO2 coatings with different ratios and nanostructure |
| 指導教授: |
蘇演良
Su, Yean-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: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 110 |
| 中文關鍵詞: | 大氣電漿熔射 、氧化鋁 、氧化鈦 、塗層 、磨潤 |
| 外文關鍵詞: | APS, Al2O3, TiO2, Coating, Tribological |
| 相關次數: | 點閱:77 下載:2 |
| 分享至: |
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摘 要
本研究使用大氣電漿噴塗製程技術,於中碳鋼底材上披覆氧化鋁基熔射塗層;塗層與底材間披覆中介層以增加塗層與底材間之黏結性。研究的目標有二:(1) 不同比例之氧化鋁-氧化鈦塗層,(2) 次微米(傳統)與奈米氧化鋁-13wt.%氧化鈦塗層。主要在探討相結構、成分、顯微硬度值、磨潤性質、以及抗熱衝擊性能。
XRD進行相結構分析;微克氏微小硬度計作顯微硬度試驗。透過摩擦試驗機進行摩擦試驗後,利用表面粗糙度量測儀量測磨痕深度,再使用電子顯微鏡觀察磨損表面及分析磨屑。抗熱衝擊試驗是將塗層試片經過反覆加熱淬火後,利用光學顯微鏡觀察表面,當出現明顯裂紋即為熱衝擊壽命。
由實驗結果得知:(1) 氧化鋁基熔射塗層隨著氧化鈦比例提升,微硬度值明顯下降。(2) 磨潤性質方面,使用不同對手材會有不同的磨耗機制產生。(3) 添加越多氧化鈦之塗層在摩擦係數上明顯的偏高,耐磨耗性能也因此降低。(4) 不同尺度結構之塗層,以奈米尺度具有較佳之耐磨耗性,可歸因於其奈米結構,使破壞能量形成許多微細的裂縫而吸收掉,故能更加抗衝擊、耐磨耗。
Abstract
The alumina-based coatings were deposited on the mild carbon steel substrates pre-coated with NiAl bondcoat by using APS system in this research. The main purpose of this research was to study the effects of the alumina-titania coatings with different ratios and nanostructure on phase structure and composition and micro-hardness and tribological and anti-thermal shock properties.
The phase structure analysis was carried out by XRD spectrum, micro-hardness values were measured by Vickers hardness tester. Dry wear tests were carried out using SRV machine, and the depth of the wear scar were measured by surface roughness measurement. Micrographs of the wear scar were observed by SEM. Thermal shock tests were performed by water quenching method, when a visible crack was detected by OM, the number of thermal cycles was recorded and defined as the number of cycles to failure.
The results showed: (1) Micro-hardness values were decreased with increasing the ratio of titania. (2) Different wear performance was found with using different counter balls. (3) The friction coefficient was increased with increasing the ratio of titania. (4) The nanostructure coating with better anti-wear and anti-thermal shock performances was because of that the nanostructure could transform fracture energy into many micro-cracks.
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