臺灣博碩士論文加值系統

　　本研究是以鈦鐵礦結構之鈦酸鋅材料為探討對象。鈦酸鋅雖然具有良好的微波介電性質，然而現今傳統方式所製備之鈦酸鋅塊材緻密度並不理想，遂本研究在鈦酸鋅中添加硼矽酸鹽玻璃，探討不同的玻璃重量百分比以及燒結溫度如何影響其燒結緻密度及介電性質。
　　鈦酸鋅和硼矽酸鹽玻璃粉末是以溶膠-凝膠法製備，兩者混合進行低溫共燒。實驗結果顯示，燒結時硼矽酸鹽玻璃會熔解成液相以提升燒結的緻密程度，隨著硼矽玻璃的量增加至10 wt.%時，達到最佳的密度約4.1g/cm3，孔隙率為1.2%，但是過量的玻璃會造成Zn4O(BO2)6相的產生，其巨大的晶粒會造成試片破裂。
　　與硼矽酸鹽玻璃共燒之ZnTiO3在微波介電性質亦有良好的提升，添加1 wt.%硼矽酸鹽玻璃850℃下燒結之ZnTiO3在共振頻率6GHz左右具有最好的品質因子，其Q×f值為52460，而添加5 wt.%硼矽酸鹽玻璃850℃下燒結之ZnTiO3具有最佳之介電常數為22。

　　This present investigation has been focused on the ZnTiO3, which has an ilmenite structure. ZnTiO3 though has good microwave dielectric properties; however, the densification of the ZnTiO3 made by traditional way is not well, so in this study, we added borosilicate glass into the ZnTiO3 to investigate the effects of the weight percentage of glass and the sintering temperature on sintering behaviors and dielectric properties of the ZnTiO3.

　　ZnTiO3 and borosilicate glass were made by sol-gel method, and were mixed for co-firing at low temperature. Experimental results show that the borosilicate glass would liquefy to improve the densification during sintering. As the weight percentage of the borosilicate glass increasing to 10 wt.%, the maximum density about 4.1 g/cm3 was obtained, and the porosity was 1.2%. However, Zn4O(BO2)6 would be formed as too much borosilicate glass was added, and its large grains would break the samples.

　　The microwave dielectric properties of the ZnTiO3 co-fired with borosilicate glass were also improved much. It shows a maximum Q factor at a frequency of 6 GHz(Q×f=52460) for the sample of ZnTiO3 with 1 wt.% borosilicate glass sintered at 850℃ for 24 hours. And it also shows a maximum dielectric constant about 22 for the sample of ZnTiO3 with 5 wt.% borosilicate glass sintered at 850℃ for 24 hours.

摘要　I
Abstract　II
圖目錄　IV
表目錄　VI
第一章　緒論　1
　1-1.　前言　1
　　1-1-1.　鈦鐵礦(Ilmenite)結構　1
　　1-1-2.　ZnO-TiO2 System 　1
　　1-1-3.　低溫共燒陶瓷(LTCC)　3
　1-2.　研究動機 3
　1-3.　研究目的 4
第二章　理論基礎 9
　2-1.　溶膠-凝膠法(Sol-gel Method) 9
　　2-1-1.　溶膠-凝膠法之起源與應用 9
　　2-1-2.　溶膠-凝膠法之定義　9
　　2-1-3.　溶膠-凝膠製程之原理　10
　　2-1-4.　溶膠-凝膠製程之優缺點　12
　2-2.　燒結過程及理論　13
　　2-2-1.　燒結的基本原理　13
　　2-2-2.　幾何形狀的考量　14
　　2-2-3.　粉末顆粒大小對燒結行為的影響　14
　　2-2-4.　液相燒結(Liquid Phase Sintering) 15
　2-3.　介電理論 17
　　2-3-1.　介電性質　17
　　2-3-2.　共振器與微波介電性質　18
第三章　實驗方法與流程　30
　3-1.　實驗方法　30
　　3-1-1.　ZnTiO3陶瓷粉末製備　30
　　3-1-2.　硼矽玻璃粉末製備　30
　　3-1-3.　塊材之製備　31
　3-2.　成分與結構分析　31
　　3-2-1.　晶粒大小　31
　　3-2-2.　X光繞射(XRD)分析　31
　　3-2-3.　掃描式電子顯微鏡(SEM)分析　32
　3-3.　材料性質分析　32
　　3-3-1.　介電性質量測　32
　　3-3-2.　孔隙率、密度量測　33
　　3-3-3.　微波介電(Microwave Dielectric)性質量測　33
第四章　結果與討論　39
　4-1.　X-ray繞射(XRD)分析　39
　　4-1-1.　XRD相檢測　39
　　4-1-2.　晶粒大小及晶粒成長活化能　40
　4-2.　密度與孔隙率　41
　4-3.　SEM表面結構分析　42
　4-4.　介電性質　44
　　4-4-1.　低頻範圍之介電性質分析　44
　　4-4-2.　微波介電性質　45
第五章　結論　64
參考文獻　65

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