| 研究生: |
陳釧鋒 Shu-Fong Chen |
|---|---|
| 論文名稱: |
利用網絡模型數值模擬粉末射出成形製程毛細吸附脫脂機制 |
| 指導教授: |
洪勵吾
Lih-Wu Hourng |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 畢業學年度: | 88 |
| 語文別: | 中文 |
| 論文頁數: | 64 |
| 中文關鍵詞: | 粉末射出成形 、毛細吸附脫脂 、有限體積法 、有限擴散聚集 、蒙地卡羅法 |
| 外文關鍵詞: | Powder injection molding, wick debinding, finite-volume scheme, diffusion-limited-aggregation(DLA), Monte Carlo method |
| 相關次數: | 點閱:12 下載:0 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
粉末射出成形最耗時的製程是將黏結劑從成形後的金屬或是陶瓷胚體內部移除。不僅許多缺陷容易在此製程產生,而且對此製程的認識甚少。為了縮短脫脂時間,可以利用吸附材粉末的毛細吸附作用來移除黏結劑。
本文利用二維的網絡模型,結合有限體積法和蒙地卡羅法數值模擬毛細吸附脫脂機制。數值模擬結果顯示:毛細吸附脫脂的時間與胚體的粉末粒徑成反比,與吸附材的粉末粒徑成正比。此外,胚體的脫脂比例與脫脂時間兩者成二次式關係。我們建議採用較大粒徑比值的胚體與吸附體粉末組合,可有效地縮短毛細吸附脫脂的時間。
This study utilizes a two-dimensional network model to investigate the mechanism of wick debinding by the numerical simulation with a technique combining finite-volume and Monte Carlo methods. The results show that wick-debinding time is proportional to the wick powder diameter and inversely proportional to the compact powder diameter. As well as the fractional debinding rate versus wick-debinding time is squared. In order to shorten the wick-debinding time effectively, we suggest that a larger particle size ratio between compact and wick may be employed.
1. 楊穆仁,“粉末射出成形技術的近況及展望”, 粉末冶金會刊, 1997, vol. 22, no.2, pp.83~87.
2. 陳文信,“金屬粉末射出成形技術”, 機械工業雜誌, 1996, vol.154, pp.148~158.
3. R.M. German,“Wear Applications Offer Further Growth for PIM”, Metal Powder Report, 1999, June, pp. 24~28.
4. M-J Yang, R. M. German,“Nanophase and Superfine Cemented Carbides Processed by Powder Injection Molding”, Int. J. Refract. Metals & Hard Mater., 1998, vol.16, pp.107~117.
5. C. Toy, Y. Palaci, T. Baykara“A New Thread-guide Composition via Low-pressure Injection Molding”, J. Mater. Proce. Tech., 1995, vol.51, pp.211~222.
6. T. Hartwig, G. Vel, F. petzoldt, H. Kunze, R. Scholl and B. kieback,“Powders for Metal Injection Molding”, J. Europ. Cerma. Soc., 1998, vol.18, pp. 1211~1216.
7. K. F. Hens, T. J. Roche, J. A. Grohowski, “Thermat Sets up for Precision PIM”, Metal Powder Report, 1996, June, pp. 24~28.
8. Karl. F. Hens, “Thermat Expands Precision PIM Operation”, Metal Powder Report, 1998, June, pp. 18~22.
9. R. M. German, K. F. Hens, “Key Issue in Powder Injection Molding”, Ceramic Bulletin, 1991, vol.70, no.8, pp.1294~1302.
10. R.M. German,“Theory of Thermal Debinding”, Int. J. Powder Metall., 1980, vol.23, no.4, pp. 237~245.
11. C. S. Aria, B.R. Petterson, “Influence of Process variables on Debinding by Melt Wicking ”Modern Development in Powder Metallurgy, 1988, vol.18, pp.403~416.
12. B.R. Petterson, C.S.Aria,“Debinding Injection Molded Materials by Melt Wicking”, JOM, 1989, pp.22~24.
13. B.K. Lograsso, R.M. German,“Thermal Debinding of Injection Molded Powder Compacts”, pmi, 1990, vol.2, no.1, pp.17~22.
14. R.Vetter, M.J. Sanders, I. Majewska-Glabus, linZ. Zhuang, Jurek Duszczyk,“Wick-Debinding in Powder injection Molding”, Int. J. Powder Metall., 1994, vol.30, no.1, pp.115~124.
15. R. Vetter, W.R. Brand Horninge, “Squared Root Wick Debinding Model for Powder Injection Moulding”, Powder Metallurgy, 1994, vol. 37, no.4, pp.265~271.
16. 柳立明 ,“ 金屬射出成形中毛細吸附脫脂製程參數之最佳化分析 ”, 國立中央大學機械所碩士論文 , 1999.
17. C.C. Chen, L.W. Hourng,“Numerical Simulation of Two Dimensional Wick Debinding in MIM”, Podwer Metallurgy, 1999, vol.42, no.4, pp.313~319.
18. T. A. Witten, L. M. Sander,“Diffusion-limited-aggreagtion”, Phys. Rev. Lett. , 1981,vol.27, pp.1400~1403.
19. J. O. Hirschfelder, C. F. Curtiss, R. B. Bird,“Molecular Theory of Gases and Liquids”, Wiley, 1954.
20. Carlos A. Grattoni, Richard A. Dawe,“Anisotropy in Pore Structure of Porous Media”, Powder Technology, 1995, vol.85, pp.143~151.
21. Y. Oyama, K. Yamaguchi,“The Distribution of Liquid Content Equilibrium of Powder Bed ”, 1962, Rep. Inst. Phys. Chem. Res., vol.38, pp.392~400.
22. Paul Meakin , “Diffusion-controlled deposition on fibers and surfaces”, The American Physical Society , 1983, vol.31, pp.2616~2623.