臺灣博碩士論文加值系統

本論文研究了在氧化鋁基體中通過TiO2和碳、硼的內在反應生成TiB2的方法。熱壓試樣中，除了TiB2外， TiC和Al2TiO5也被發現是分散在Al203基體中的相。 然而，在無壓燒結樣品的情況下，通過在1300℃保持30分鐘以上的預熱步驟，然後在高於1500℃的溫度下燒結，可以獲得具有＞99％相對密度的純Al2O3 / TiB 2複合物。在1300℃預熱3小時，然後在1600℃真空燒結1小時獲得在機械測試中表現出最佳性能，無壓燒結含20vol％TiB 2的複合材料的彎曲強度為580MPa，斷裂韌性為7.2MPa·m1/2。
我們也比較了TiB2三種不同製程，分別如下:
(a) 在內在反應中，TiO2和碳、硼的內在反應生成TiB2。
(b) 在直接添加，TiB2採用直接加入Al2O3在1500℃下燒結1- 2小時不經過任何內在反應。
(c) 在最高溫延長一小時，TiB2在反應過程中再以高溫的狀態下延長一小時。
通過內在反應方法、直接添加、在高溫延長一小時來獲得韋伯常數(Weibull constant)m，三種不同製程中發現了內在反應的韋伯常數(Weibull constant)m跟其他兩者相較之下來的高。
韋伯常數(Weibull constant)m，分別如下:
(a) 內在反應:14.897
(b) 直接添加: 13.377
(c) 最高溫延長一小時: 13.461
本研究內在反應韋伯常數(Weibull constant)m最高屬於可靠性最佳。

In this paper, we studied the in situ formation of TiB2 through the reaction of TiO2 and carbon in an alumina matrix. In the hot-pressed specimens, in addition to TiB2, Tic and Al2TiO5 were also found to be dispersed in the Al2O3 matrix. However, when the samples were pressureless sintered, pure Al2O3/TiB2 composites with a relative density of > 99% can be obtained by preheating at 1300°C for more than 30 minutes and then sintering at temperatures larger than 1500°C. The sintered composite containing 20 vol% TiB2 has a bending strength of 580 MPa and a fracture toughness of 7.2 MPa m1/2.
Besides, we also compared three different kinds of processes:
(a) In situ formation: Through the reaction between TiO2, carbon and boron to produces TiB2.
(b) Adding TiB2 powders into Al2O3 without in situ reaction and sintering 1-2 hours at 1500℃.
(c) Extending 1 hour heating time at the highest temperature.
After calculating the Weibull constant “m” of three process, we knew that the Weibull constant “m” of in situ reaction is the highest of them.
The Weibull constant “m” is as follows:
(a) In situ reaction: 14.897
(b) Add TiO2 directly: 13.377
(c) Extending 1 hour heating time at the highest temperature: 13.461
According to the result, the reliability of in situ reaction is the best of them.

摘要...........................i
Abstract......................ii
誌謝..........................iv
目錄...........................v
表目錄......................viii
圖目錄........................xi
第一章緒論.....................1
第二章 文獻探討................2
2.1氧化鋁基複合材料（Al2O3）....2
2.1.1氧化鋁奈米壓痕法...........2
2.1.2單邊切口梁法測量 (SENB)....2
2.2二硼化鈦(TiB2)..............3
2.2.1二硼化鈦成分結構...........3
2.2.2二硼化鈦應用範圍...........4
2.2.3二硼化鈦性能...............4
2.3.1碳化硼陶瓷特性.............5
2.3.2碳化硼陶瓷的應用...........5
2.4碳(Carbon)..................6
2.4.1碳的特性...................6
2.4.2碳的應用...................7
2.6二氧化鈦.....................8
第三章實驗步驟...................9
3.1實驗原料.....................9
3.2實驗器材.....................9
1.球磨機 (Ball mill)...........9
2. X射線繞射儀（X-ray diffractometer，XRD）.........10
3. 穿透式電子顯微鏡(TEM、CTEM）......................12
4. 阿基米德法.......................................13
5.四點彎曲.....................13
3.2.2分析軟體..................14
(1)MATLAB起源..................14
(2) 優勢特點...................14
(3) 重要功能...................14
3.3實驗程序....................16
第四章結果與討論................18
4.1 燒結和相鑑定................18
4.2 密度.......................21
4.3微觀結構調查.................24
4.4機械性能.....................26
4.5.破壞強的統計分析.............30
4.6三個熱壓TiB2試樣的斷裂載荷....34
第五章結論......................38
參考文獻........................39
Extended Abstract..............42

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