臺灣博碩士論文加值系統

　　蛇紋岩是本省礦產資源中僅次於大理石，儲量居第二位的非金屬礦產資源，儲量達20億噸，年產量約為25萬公噸，主要作為鋼鐵工業助熔劑之用。由MgO-Al2O3-SiO2三成份系統相圖可知，在常壓下此系統中含有堇青石(Mg2Al4Si5O18)及亞藍寶石(Mg4Al10Si2O23)二個三元礦物。本研究將提純之蛇紋岩與高嶺土混合，以固態反應方式，合成堇青石及亞藍寶石，並進一步製備陶瓷體，測試其熱、介電及物理性質。
　　結果顯示，蛇紋岩與高嶺土混合，在1300℃以上可合成堇青石，在1400℃以上可合成亞藍寶石。在1300℃燒結所得堇青石陶瓷體，密度可達98 %理論密度，熱膨脹係數為1.5x10-6，相對介電常數約為2(1 kHz~ 1MHz)，品質因子最大約為80(1 MHz)。在1450℃燒結所得亞藍寶石密度可達86 %理論密度。

Serpentine is the second largest industrial mineral in Taiwan, R.O.C., with a reserve of about 2 billions, which is only less than that of marble. The annual output is about 250,000 tons, mainly used as a flux in the iron and steel industry. There are two ternary minerals, i.e. cordierite (Mg2Al4Si5O18) and sapphirine(Mg4Al10Si2O23) in the MgO-Al2O3-SiO2 ternary system at atmospheric pressure. In this study, serpentine, kaolinite and other oxides were mixed at appropriate proportions and were subjected by solid state reaction to synthesize cordierite and sapphirine. The ceramics were prepared from the synthesized powders, and their thermal, dielectric and physical properties were measured.
　　The results show that cordierite can be synthesized from serpentinite mixed with kaolinite at temperatures above 1300℃. Sapphirine can be synthesized above 1400℃. The cordierite ceramic body sintered at 1300℃ has a density of 98% theoretical. The thermal expansion coefficient is about 1.5x10-6. The relative dielectric constant of is approximately 2 (1 kHz ~ 1MHz). The quality factor is about 80 (1 MHz). The sapphirine sintered at 1450℃has a density only 86% of theoretical.

摘要 I
Abstract II
表目錄 V
圖目錄 VI
誌謝 IX
第1章 緒論 1
1.1 研究背景 1
1.2 研究目的 9
第2章 理論基礎與前人研究 10
2.1 固態反應之原料及產物 10
2.1.1 蛇紋岩 10
2.1.2 高嶺石 12
2.1.3 堇青石 15
2.1.4 亞藍寶石 19
2.2 電路基板所需之材料性質 21
2.3 燒結性質 24
2.4 固態反應合成堇青石粉末之研究 28
2.5 堇青石陶瓷體燒結之研究 28
第3章 實驗方法與步驟 30
3.1 材料 30
3.1.1 蛇紋岩及除鐵前處理 30
3.1.2 高嶺土 33
3.1.3 其他原料 36
3.2 步驟 37
3.2.1 煆燒粉末之製備 37
3.2.2 陶瓷體之製備 40
3.3 性質分析 40
3.3.1 晶相分析 40
3.3.2 熱重熱差分析 40
3.3.3 化學分析 40
3.3.4 粉末比表面積 41
3.3.5 掃描式電子顯微鏡觀察 41
3.3.6 粒徑分佈 42
3.3.7 燒結體視密度與孔隙率 42
3.3.8 熱膨脹係數 42
3.3.9 介電常數與品質因子之量測 43
第4章 結果與討論 45
4.1 蛇紋岩、高嶺土加熱性質及產物 45
4.1.1 蛇紋岩 45
4.1.2 高嶺土 47
4.2 堇青石合成 49
4.2.1 反應溫度對堇青石相生成之影響 49
4.2.2 持溫時間對(1S+3K)配方生成堇青石之影響 52
4.2.3 不同蛇紋岩/高嶺土配比對堇青石生成之影響 56
4.2.4 煅燒粉末之比表面積 60
4.2.5 煆燒粉末之顯微觀察 60
4.3 堇青石燒結體之製備 63
4.3.1 燒結溫度對相對密度之影響 63
4.3.2 燒結溫度對顯微結構之影響 65
4.3.3 燒結溫度對熱膨脹係數之影響 65
4.3.4 燒結溫度對介電性質及品質因子之影響 70
4.4 亞藍寶石合成 74
4.4.1 原料配比對亞藍寶石相生成之影響 74
4.4.2 持溫時間對亞藍寶石生成之影響 76
第5章 結論 78
參考文獻 79
附錄A　Standard Atomic Absorption Conditions 82
附錄B 熱膨脹係數升溫、降溫曲線圖 85
附錄C 燒結體之介電常數及品質因子 91
附錄D 安德利森瓶(Andreasen pipette)粒徑分佈量測步驟 94
附錄E 阿基米德密度量測數據 98

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