Effect of Al2o3 Reacted by In-Situ Synthesis between Fly Ash and Aluminum Melt on Microstructure and Mechanical Properties of Aluminum-Fly Ash Composites

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簡歷

基本資料

Project title

Code/計畫編號

MOST105-2221-E019-025

Translated Name/計畫中文名

飛灰與鋁湯間原位合成氧化鋁對鋁基飛灰複合材料顯微結構與機械性質之影響

Project Coordinator/計畫主持人

Shuei-Wan Juang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Mechanical and Mechatronic Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11887894

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

01-07-2017

Bugetid/研究經費

783千元

ResearchField/研究領域

機械工程

"以液態金屬鑄造鋁基飛灰複合材料是一種原位合成（in-situ synthesis）的特性，飛灰主要成分中的SiO2 及Fe2O3 與鋁湯反應生成Al2O3，此原位合成的Al2O3 與原飛灰中的Al2O3 成分構成複合材料的強化相材；同時飛灰顆粒亦逐漸還原分解出Si 及Fe 分布於鋁湯中，再與基材合金形成第二相析出物，改變原有材料的組織。因此，飛灰與鋁基合金的反應生成將影響強化材的成分及結構型態，進而影響複合材料的各項性質。本研究擬篩選25~38μm、38~53μm、53~106μm 與106μm 以上等不同粒徑範圍之飛灰，預先使用純鋁熔湯和不同顆粒大小飛灰，以攪拌鑄造製備Al + 3wt% Mg + 5wt% 飛灰複合材料漿料，再分別在750℃、800℃及850℃溫度下進行反應生成實驗，反應時間分別為0、10、20、30 及40 小時，以探討反應生成對複合材料的微觀結構及機械性質之影響。本研究將利用OM、EDX、XRD 與XPS 等方法，分析反應生成對複合材料微觀結構之影響，而在機械性質的評估方面，將採用BHN 硬度試驗及拉伸試驗。另外，使用阿基米德法測量複合材料的密度，評估飛灰顆粒還原分解後對複合材料孔隙率之影響。本計畫獲致的研究成果除大幅深化鋁基飛灰複合材料之基礎研究外，亦有助於掌握複合材料製程變因及提升複合材料品質及生產良率。" "Aluminum-fly ash composites being cast in liquid metal state is a characteristics of in-situ synthesis. The Al2O3 formed by reaction between main components of fly ash, SiO2 and Fe2O3, with molten aluminum alloys, in which the Al2O3 formed by in-situ synthesis and original Al2O3 component in fly ash constitute as the reinforcing phase. At the same time Si and Fe are decomposed in the gradual reduction of fly ash and distributed in the aluminum melt, which might then form a second phase precipitates with the substrate material, changing the nature of the original material. Thus, the reaction formation between fly ash with aluminum melt will affect the composition and structure of reinforced materials, thereby affecting the properties of composites. In this study the fly ash is screened into different sizes ranging as 25~38μm, 38~53μm, 53~106μm and 106μm above. The Al + 3wt% Mg + 5wt% fly ash composites with aluminum melt and different sizes of fly ash are pre-formed by stir casting, and then the reaction experiments are respectively conducted at 750℃, 800℃ and 850℃. The reaction time is 0, 10, 20, 30 and 40 hours, respectively, to investigate the influence of reactions on the microstructure and mechanical properties of the composites. OM, EDX, XRD and XPS will be used to analyze the effect of reactions on the microstructure of aluminum fly ash composites. Both BHN hardness and tensile tests will be utilized to assess the mechanical properties. In addition, the density of the composites is measured by using the Archimedes method to study the influence of fly ash after reductive decomposition on the composite porosity. The findings obtained from this study are expected to be able to significantly deepen the basic understanding of aluminum fly ash composites and further help control the process parameters and improve the quality of composites as well as production yields."

Keyword(s)

原位合成反應
微觀組織
機械性質
鋁基飛灰複合材料
reaction of in-situ synthesis
microstructure
mechanical properties
aluminum-fly ash composite

DSpace CRIS

Effect of Al2o3 Reacted by In-Situ Synthesis between Fly Ash and Aluminum Melt on Microstructure and Mechanical Properties of Aluminum-Fly Ash Composites

基本資料

Description