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姓名 陳偉忠( Wen-Zhong Chen)  查詢紙本館藏   畢業系所 化學工程與材料工程學系
論文名稱 氧化鐵粉對二氧化矽碳熱還原氮化反應影響之研究
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摘要(中) 本研究以氧化鐵粉為添加劑,並以氮氣作為反應氣體,進行二氧化矽碳熱還原反應,探討氧化鐵粉添加劑對反應後產物的轉化率、形態結構及反應速率等影響。實驗中使用直立式管狀高溫爐系統,由氮化反應前後的重量變化求得二氧化矽的轉化率,並探討各項操作變數對氮化反應的影響。
本實驗主要探討的操作變數包括:氮氣流率、氧化鐵粉的添加量、C/SiO2莫耳數比、樣品載量及反應溫度等。研究中並做各種物性分析如:感應耦合電漿質譜分析儀(ICP-MS)、比表面積測定儀(BET)、X-射線繞射儀(XRD)、掃描式電子顯微鏡(SEM)等來印證各種實驗結果。
實驗結果顯示,增大氮氣流率可增加二氧化矽的轉化率,當流率大於500 ml/min時,轉化率的影響就不太明顯。添加氧化鐵粉可以增加二氧化矽的轉化率。當C/SiO2莫耳數比大於5時,轉化率影響也不大。溫度升高則可以促進反應速率。整個氮化反應主要是以氣/固反應為主,添加氧化鐵粉後氮化反應主要產物為纖維狀碳化矽,並推測添加氧化鐵粉後造成Fe-Si液態合金的形成是碳化矽成長的重要機制。在化學反應控制區內,添加1wt%的氧化鐵粉,C/SiO2莫耳數比為6時,反應活化能為123.54kJ/mol。
摘要(英) The carbothermal reduction and nitridation of silicon dioxide with iron oxide powder addition was investigated by weight change measurement. The aim of this study is to know the effect of different operating variables on the degree of conversion of silicon oxide. In this study, the main operating variables have been discussed included: nitrogen flow rate, amount of iron oxide powder added in the reactant, silica /graphite molar ratio, sample weight, and reaction temperature. The analysis of this experiment is conducted by inductively coupled plasma-mass spectrometer (ICP-MS), BET surface area, X-ray diffraction (XRD) and scanning electron microscope (SEM).
The experimental results indicated that the conversion of silicon dioxide is increased with an increasing nitrogen flow rate, when the gas flow exceeded 500ml/min, the effect is not appreciable. The conversion of silicon dioxide is increased with an increasing amount of iron oxide powder added in the reactant. An excess of graphite is required to promote the degree of conversion of silicon oxide, however, the effect is not appreciable, when the molar ratio is above 5. Moreover, the higher the reaction temperature the faster the reaction rate. The reaction product is fibrous shape β- SiC with iron oxide addition. We conjectured that the formation of liquid Fe-Si alloy is an important way for β- SiC growth. In the chemical reaction controlled region, the activation energy of the reaction is 123.54 kJ /mol when iron oxide powder added is 1wt% and C/SiO2 molar ratio is
關鍵字(中) ★ 氮化反應
★ 氧化鐵
★ 碳化矽
★ 碳熱還原
關鍵字(英) ★ carbothermal reduction
★ nitridation
論文目次 中文摘要
英文摘要
目錄I
圖索引III
表索引VI
符號說明VII
第一章 緒論1
第二章 文獻回顧8
2.1 氮化矽的型態結構9
2.2 二氧化矽的碳熱還原反應11
第三章 理論背景17
3.1 氮化矽生成機構及熱力學上的分析17
3.2氧化鐵粉添加劑造成反應機構的變化…………………...21
3.3 動力學上的分析24
3.4二氧化矽轉化率的計算26
第四章 實驗部份30
4.1 藥品及氣體30
4.2 儀器設備30
4.3 試樣的前處理33
4.4 氮化反應系統35
4.5 反應物的金屬成份分析38
4.6 試樣的物性分析39
4.7 實驗流程概要和操作變數43
第五章 結果與討論46
5.1 試樣物性的分析結果46
5.2 二氧化矽還原條件的探討58
5.3反應動力學的研究……………………………………… 70
5.4碳化矽生長機構的探討75
第六章 結論77
參考文獻79
附錄 實驗數據84
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指導教授 張奉文(Feg-Wen Chang) 審核日期 2001-7-6
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