研究生: |
汪子暄 Tzu-Hsuan Wang |
---|---|
論文名稱: |
稀土元素(氧化釔)含量對Ti-6Al-4V表面被覆碳化矽粉末之微結構與磨潤行為的影響 Effects of Rare Earth Element Y2O3 on the Microstructure and Wear Behaviors of Ti-6Al-4V Cladding with SiC |
指導教授: |
林原慶
Yuan-Ching Lin |
口試委員: |
向四海
Sz-Hai Shiang 郭俊良 Jiun-Liang Guo |
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: | 2018 |
畢業學年度: | 106 |
語文別: | 中文 |
論文頁數: | 171 |
中文關鍵詞: | 氬銲 、被覆層 、鈦合金 、碳化矽 、氧化釔 、磨耗 |
外文關鍵詞: | Gas tungsten arc welding(GTAW), Coating, Ti-6Al-4V, Silicon carbide, Yttrium oxide, Wear |
相關次數: | 點閱:300 下載:0 |
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本文將不同比例之稀土元素氧化釔(Y2O3)添加至主要陶瓷粉末碳化矽(SiC)及金屬粉末(Ni)當中混合均勻,進行氬銲被覆(Gas tungsten arc welding;GTAW)於Ti-6Al-4V鈦合金表面,探討不同比例之稀土元素對顯微組織、機械性質的影響,接著使用迴轉式磨耗試驗機以銷對盤(Pin-on-Disc)的線接觸方式進行磨耗試驗,評估被覆層的耐磨耗能力。
研究結果顯示,當碳化矽粉末(SiC)與不同比例(0%、2.5%、4.5%、6.5%)之氧化釔(Y2O3)混合時,所形成的被覆層皆會臨場(in-situ)合成TiC顆粒狀、樹狀析出物及TiSi2塊狀析出物。隨著氧化釔的添加,析出物數量增加且密集,但過量的氧化釔,卻會導致析出物的量減少。
磨耗試驗顯示不同成份的被覆層皆能改善Ti-6Al-4V鈦合金表面的耐磨耗能力,而且添加氧化釔有助於提升耐磨耗能力。在最大接觸應力263MPa的條件下,80%SiC+17.5%Ni+2.5%Y2O3被覆層有最佳的耐磨耗能力,因其H/E值為所有被覆層中最高,意即接觸表面受力後易產生彈性變形,而降低真實接觸應力,因此其磨耗量最低且摩擦係數穩定;在最大接觸應力339MPa的條件下,80%SiC+17.5%Ni+4.5%Y2O3被覆層有最優的耐磨耗能力,因強化相的密集分佈,使其磨耗量最低。
This study elucidates the effect of the percentage of Y2O3 on the microstructure and tribological performance of Ti-6Al-4V that is clad in SiC and Ni powder, using gas tungsten arc welding(GTAW). The microstructure, reinforcing phase, mechanical properties were analyzed using SEM, EDS, XRD, EPMA, Vickers hardness tester and Nanoindenter. In addition, a pin-on-disc rotating tribometer was used to evaluate he wear resistance of the substrate and the clad specimens.
According to the experimental results, TiC and TiSi2 precipitates are formed in situ in the clad layer during the cladding process. Adding a suitable amount of Y2O3 promotes the formation of reinforcing phases, but an excessive amount of Y2O3 reduces the formation of reinforcing phases.
The wear test results indicate that all the clad layers improve the wear resistance of Ti-6Al-4V, and the wear resistance of the clad layer that contained Y2O3 is better than that of the clad layer without Y2O3. Under the condition of contact stress of 263 MPa, the 80%SiC+17.5%Ni+2.5%Y2O3 clad layer has the best wear resistance because the wear loss of 80%SiC+17.5%Ni+2.5%Y2O3 clad layer is the lowest among all the clad layers. Under the condition of a contact stress of 339 MPa, the 80% SiC+15.5%Ni+4.5%Y2O3 clad layer has the best wear resistance because the formation of plenty of reinforcing phases, which reduce the wear loss of the 80%SiC+15.5%Ni+4.5%Y2O3 clad layer.
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