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題 名 | The Improvement of Mechanical Properties in Al-base Metal Matrix Composites by Addition of Wetting Promoters=以界面潤濕劑提升鋁基複合材料機械性質之研究 |
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作 者 | 林正忠; 邱垂泓; 沈煥欽; 邱六合; 楊智富; | 書刊名 | 大同學報 |
卷 期 | 25 1995.11[民84.11] |
頁 次 | 頁355-368+449 |
分類號 | 440.34 |
關鍵詞 | 界面潤濕劑; 鋁基複合材料; |
語 文 | 英文(English) |
中文摘要 | 本研究首先利用漩渦(vortex method)法製造鋁基複合材料,所添加的強化粒子 包含 15 及 20 vol %的氧化鋁及碳化矽陶瓷顆粒,其次探討界面潤濕劑的效益。實驗結果 顯示,添加鈣、鎂界面潤濕劑可大幅提升陶瓷顆粒與鋁湯之間的潤濕性,亦即在鋁湯中添加 潤濕性元素比未添加潤濕性元素其陶瓷顆粒飽合添加量可大幅提升,且鈣潤濕劑對於陶瓷顆 粒飽合添加量的效應比鎂更強。 金相觀察顯示,所添加的 #600 及 #1000 mesh 碳化矽陶瓷顆粒顆粒可均勻分散在 A356 母 材中, 而 #1000mesh 氧化鋁顆粒與鋁湯之間的論濕潤性不佳,故在 6061 母材中有分散不 均的現像,複合材料中 #1000mesh 氧化鋁顆粒凝集的現象可經由擠型而改善。 此外利用電 子顯微鏡 (SEM) 觀察複合材料的顯微組織,並以 EDX 及 X 光繞射儀 (XRD) 分析陶瓷顆粒 與母材之間的界面相, 研究結果市顯示,在氧化鋁粒表面形成富鈣( CaAl �� O �瓷^及富 鎂尖晶石相( MgAl �� O �� spinel ),此尖晶石相可改善鋁湯與陶瓷顆粒的潤濕性; 當 操作條件在高矽及低溫下可避免在碳化矽表面形成碳化鋁( Al �� C �陛^相, 以防止界面 劣化反應的發生。 最後探討鈣、鎂潤濕劑含量對三點彎曲性質的影響, 並以 SEM 觀察複合材料斷裂面的破壞 情形。 |
英文摘要 | Dispersion of Al�烙�軒nd SiC particulates of size #600 and #1000 mesh in molten aluminum alloys using the vortex method was studied. It was found that a significant improvement in the wetting of particulates with molten aluminum alloys was attained through additions of Ca and Mg as wetting promoters, by which the maximum uniformly dispersed volume fractions of particulates mixed in molten aluminum increased up to sixfold when compared to that without the wetting promoter, and the wetting effect of Ca wetting agent was stronger than that of Mg addition. The microstructures and the interphases at reinforcing particles/Al alloymatrix interface were investigated by OM. SEM/EDX and XRD. The results showed that CaAl �� O �� and MgAl �� O �� spinels crystal formed at the surface of Al �� O �� particles during vortex process. The bending strength of MMCs and the effect of wetting agents were discussed, which the fractography of SiCp/A356 and Al �� O �� /6061 Al alloy composites were observed. |
本系統中英文摘要資訊取自各篇刊載內容。