奈米合成技术一气相法-台北科技大学.PDF

Particulate Processing Metals Ceramics Nanomaterials [1]Groover, M. P., Fundamentals of Modern Manufacturing, 2th Edition, ISBN=0-471-40051-3, John Wiley Sons, Inc., 2002. [2]馬振 基﹐奈米材料科技原理與應用﹐ISBN:957-21-4309-3 全華科技圖書股份有限公司﹐2003 [3] Zhong L. Wang, Characterization of Nanophase Materials , Wiley-VCH Verlag, Berlin Heidelberg, 1999 [4] 林景崎﹐奈米材料導論﹐中央大學 Metals Powder Metallurgy 粉末冶金(Powder Metallurgy) 乃將金 屬粉末置於模型 (Mold)中﹐或以 Die成 型後﹐先進行壓緊再燒結(Sintering)後 冷卻固化成型﹐粉末冶金(Powder Metallurgy) 主要用在不規則形狀元 件﹑極硬不易加工 金屬材料元件等製 作上﹐在進行粉末冶金(Powder Metallurgy)前當然得先將金屬粉末 化﹐非常適合大量生產而不會有很大 的材料浪費。 Powder Metallurgy •產品 •金屬粉末化 •製程 產品 Examples of Powder Metallurgy Production of Powder Metallurgy 金屬粉末化 Engineering Powders A powder can be defined as a finely divided particulate solid Engineering powders include metals and ceramics Geometric features of engineering powders: – Particle size and distribution – Particle shape and internal structure – Surface area Measuring Particle Size Most common method uses screens of different mesh sizes Mesh count - refers to the number of openings per linear inch of screen(單位 長度的 孔數) – A mesh count of 200 means there are 200 openings per linear inch – Since the mesh is square, the count is the same in both directions, and the total number of openings per square inch is 2002 = 40,000 – Higher mesh count means smaller particle size 以網子(Mesh)進行粉末顆粒篩選 ﹐PS為顆粒直 徑 ﹐tw為網線直徑 ﹐MC為Mesh Count ﹐1/MC為網子 一格含網線直徑之寬。 Particle Shapes Area-to-Volume Ratio 球半徑 r 球直徑D 球面積 A 4p r2 p 2r 2 p D2 4 3 1 3 1 3 球體積 V 3 p r 6 p 2r 6 p D A 6 V D A Ks