臺灣博碩士論文加值系統

本論文為利用高溫自行燃燒合成法(SHS)，配合上電動油壓機同步施壓，以合成高緻密材料之研究。研究中選擇的系統為鎳鋁介金屬(NiAl)與碳化鈦(TiC)兩種，整個燃燒合成與緻密化的過程皆在低氧濃度的手套箱反應器內進行，而油壓機方面採加壓主體與油箱分離之設計。實驗中改變的參數為施壓壓力與施壓時機，合成之產物則進行相對密度、顯微結構、X光繞射及維氏硬度等分析。
由分析結果，我們以588 MPa的施壓壓力及反應後0秒的施壓時機，分別獲得相對密度為99.0 %及81.1 %的NiAl及TiC產物，另外對於施壓壓力與施壓時機的改變，我們發現：
NiAl系統
1. 施壓壓力的增加，有助於產物相對密度的增加、晶粒大小的縮小、硬度的提升以及產物均勻性的改善，但其中晶粒大小及硬度並不會隨著壓力的再提升，而有明顯的改變。
2. 施壓時機的延後，會導致產物相對密度的下降，晶粒大小的增加，但兩者皆不會隨著施壓時機的再延後，而有明顯的改變。此外施壓時機的延後對於產物的硬度及均勻性並無明顯影響。
TiC系統
1. 施壓壓力的增加，有助於產物相對密度的增加、晶粒大小的縮小、及均勻性的改善，但其中相對密度及晶粒大小並不會隨著壓力的再提升，而有明顯的改變。此外，當施壓時機為反應後0秒時，壓力的增加反而會導致反應不完全的情況更加明顯。
2. 施壓時機的延後，會導致產物相對密度的下降，但隨著施壓時機的再延後，結構會愈來愈鬆散。

The thesis is to produce the densified materials via the self-propagating high-temperature synthesis(SHS) with a simultaneously pressing by a hydraulic press. In this research, nickel-aluminum intermetallic(NiAl) and titanium-carbide(TiC) material systems were studied. The experiment was carried out in a glove-box type reactor, with a hydraulic press, custom design with pressurized body and oil tank separated, sitting inside the reactor. Two main parameters were studied including compaction pressure and pressing time. The products were take subjected to density measurement, scanning electron microscope(SEM), X-ray diffraction(XRD) and Vickers hardness analysis.
According to results, under the 588 MPa and compaction at zero second after the end of combustion, the theoretical densities of NiAl and TiC were obtained 99.0% and 81.1%, respectively. Further, with compaction pressure and pressing time varied, we found that:
for NiAl system
1. The increase of compaction pressure increased the relative density, decreased the grain size, increased the sample hardness and improved the product uniformity. Grain size and hardness would not further change obviously by an increasing pressure.
2. The delay of pressing time would cause the decrease of relative density, increase of grain size. This determination reached to a certain degree if the time delayed more. Besides, the delay of pressing time did not influence hardness and uniformity of products significantly.
for TiC system
1. The increase of compaction pressure increased the relative density, decreased the grain size and improved the product uniformity. Relative density and grain size would not further change obviously by a increasing pressure. Besides, if pressing time is zero second after the end of combustion, the increase of compaction pressure would cause the incompleteness of reaction more significantly.
2. The delay of pressing time would cause the decrease of relative density, however, the structure would become looser if the time delayed more.

第一章 簡介1
1.1高溫自行燃燒合成法介紹1
1.2高溫自行燃燒合成法熱力學2
1.3高溫自行燃燒合成法理論5
1.3.1燃燒波速5
1.3.2活化能6
1.3.3溫度分布6
1.3.4燃燒模式：穩定和非穩定反應7
1.3.5平衡與非平衡機構9
1.3.6影響高溫自行燃燒合成反應的程序變數9
第二章 研究動機與文獻回顧12
2.1研究動機12
2.2文獻回顧13
2.2.1.熱壓法(Hot Pressing，HP)13
2.2.2熱均壓法(Hot Isostatic Pressing，HIP)14
2.2.3.擬-熱均壓法(Pseudo-Hot Isostatic Pressing，P-HIP)15
2.2.4動態施壓法(Dynamic Compaction，DC)16
第三章 實驗設計與實驗方法17
3.1實驗設計17
3.2實驗方法18
3.3儀器設備18
3.3.1手套箱反應器19
3.3.2 電動油壓機20
3.3.3 影像擷取系統21
3.4 藥品21
3.5 實驗前準備22
3.6 燃燒合成與同步緻密化裝置23
3.6.1 NiAl系統23
3.6.2 TiC系統24
3.7 實驗步驟24
3.8 分析方法25
3.8.1 相對密度測量25
3.8.2 顯微鏡結構觀察26
3.8.3 X光繞射分析28
3.8.4 硬度分析29
第四章 結果與討論30
4.1 NiAl系統30
4.1.1 NiAl燃燒合成與同
4.1.2 NiAl產物外形30
4.1.3 NiAl產物相對密度之探討31
4.1.4 NiAl顯微結構之探討32
4.1.5 X光繞射分析36
4.1.6 硬度分析36
4.2 TiC系統38
4.2.1 TiC燃燒合成與同步緻密化過程38
4.2.2 TiC產物外形探討38
4.2.3 TiC產物相對密度之探討40
4.2.4 TiC顯微結構之探討41
4.2.5 X光繞射分析43
4.2.6 硬度分析44
第五章 結論與展望45
5.1 NiAl系統45
5.2 TiC系統46
5.3 展望47
參考文獻100
符號說明105

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