轉注射出成形(Resin Transfer Molding，簡稱RTM)因其加工週期短、成本低、且產品之精度與強度高， 故近年來在航太、汽車及精密工業上的應用日趨廣泛，而金屬粉末射出成形(Metal Injection Molding，簡稱MIM)主要的特點在於可大量生產小型複雜且具高密度的零件。但此二製程中纖維或粉末狀多孔性介質之物理與化學性質仍不太為人所了解，致使其成品品質不能保持一定，也難於自動化生產。尤以數值模擬及分析製程時，常常不能掌握詳細的飽和度與毛細力的關係。因此本文以纖維與細鋼珠作為實驗材質，並以蠟加熱到融點以上作為工作流體，利用一自行設計之離心裝置充當毛細力的作用，分別作出排放流(drainage)與吸附流(Imbibition)其飽和度與毛細力之關係曲線，並探討飽和度與毛細力、空孔度、滲透度之間的關係，進而發展出一個適用於多孔介質計算飽和度的關係函數。此關係對於數值工作者在分析上，足以提供有效的微觀參考資料。 The merit of short cyclic period, low cost, high precision and high strength have made the process of resin transfer molding more and more attractive to the automobile, aerospace, and precision industry. And the main advantage of metal injection molding is in large production of small, complex, and high density component parts. However, their physical and chemical phenomena during the manufacturing process has not been understood throughtfully. The quality of the products is thus not under control and the automation of the process is impossible. The accurate relations between saturation and capillary in the porous media such as fiber and powder can’t be described, especillary in the numerical analysis. In this article, a centrifuge equipment is designed to simulate the capillary effect and the wax is heated beyond its melting point to be the working fluid. Curve of capillary versus to saturation is sketched and the relations of saturation, capillary, porosity, and permeability are discussed. A function for saturation in the porous media is developed. The function can provide effective micro references to the numerical simulations.
