以粉末冶金及熱壓擠製方式製作石墨-鋁基複合材料之研究;Study on Graphite-Aluminum Matrix Composites Fabricated by Powder Metallurgy and Hot Extrusion

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Title:	以粉末冶金及熱壓擠製方式製作石墨-鋁基複合材料之研究;Study on Graphite-Aluminum Matrix Composites Fabricated by Powder Metallurgy and Hot Extrusion
Authors:	張銘鳳;Chang, Ming-Feng
Contributors:	機械工程學系
Keywords:	粉末冶金;熱壓擠製;石墨-鋁基複合材料;標準差;電極;powder metallurgy;hot extrusion;graphite-aluminum matrix composites;standard deviation;electrode
Date:	2023-06-29
Issue Date:	2024-09-19 17:26:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	摘要本研究是運用粉末冶金的方式製作石墨-鋁基複合材料，希望透過此方式來改善複合材料的均勻性，並運用熱壓擠製加工來提升複合材料的材料性質。另外，將此複合材料製作成水產氫(water electrolysis)電極，以探討這些電極之電解效果。本實驗以標準差 σ 來評估複合材料組織的均勻性。實驗顯示三組複合材料的 σ 值變動均很小，表示以此方式製作複合材料是可行的。材料經熱壓擠製後，四種以粉末製作的試棒其抗拉強度比鋁鑄錠試棒大約增加26.6~ 27.8%。實驗材料 Alp、Alp-1％G 及 Alp-0.5％Gf，其導電度分別為 61、 58.9 及 61.1 IACS(International Annealed Copper Standard)，顯示本實驗方式是有助於改善複材導電度下降的問題。在10wt.% KOH 鹼性電解液中，電解電壓 3.88V，以收集 100cc 氫氣為電解時間。結果顯示石墨-鋁基複材電極均比純鋁電極有較佳的產氫的效果。然而，使用 10wt.% HNO3 酸性電解液中，四種電極材料在電解過程均產生鈍化現象，不具實用價值。;Abstract This research is to make graphite-aluminum matrix composites by powder metallurgy , hoping to improve the uniformity of composites through this method, and use extrusion processing to improve the material properties of composites. In addition, these composite materials were fabricated into water electrolysis electrodes, which were investigated the electrolysis effect. In this experiment, the standard deviation σ is used to evaluate the uniformity of the composite structure. Experiments show that the σ value of the three groups of composite materials varies little, indicating that it is feasible to make composite materials in this way. After hot extrusion, the tensile strength of the four test bars made of powder is approximately 26.6-27.8% higher than that of the aluminum ingot test one. The experimental materials Al, Alp-1%G and Alp-0.5%Gf have conductivity of 61,58.9 and 61.1 IACS (International Annealed Copper Standard), show that this experimental method is helpful to improve the problem of the decrease of the conductivity of composite materials. In 10wt.% KOH alkaline electrolyte, the electrolysis voltage is 3.88V, and 100cc of hydrogen is collected as the electrolysis time. The results show that the graphite-aluminum-based composite electrodes have better hydrogen production effect than pure aluminum electrodes. However, in the use of 10wt.% HNO3 acid electrolyte, the four electrode materials all produce passivation during the electrolysis process, which is not practical.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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