臺灣博碩士論文加值系統

本實驗是研究氧化鋁/碳化鉻複合材料以內在反應方法合成。透過氧化鉻與碳化矽之間的固態反應形成碳化鉻粒子，以碳化鉻粒子進行內在反應來強化氧化鋁已被研究過。在氧化鋁基體中形成三種鉻的化合物：Cr3Si、Cr3C2、Cr7C3和莫萊石。熱壓過程中的反應行為取決於加熱時的參數例如溫度等等。
在真空環境下，首先形成的Cr3Si顆粒在1550℃以下為主要分散相，Cr7C3相在1600℃以上佔主導地位。Cr3C2在溫度低於1500℃時短暫地出現，到了高於1500℃時則減少。然而，在氬氣環境中，在1450-1550℃的溫度範圍內，Cr3C2相是主要的產物。
莫來石相是通過SiO2相擴散到Al2O3基體中形成的，這是Cr2O3和SiC反應的副產物。將碳化鉻或矽化物顆粒結合到Al2O3基體中可以引起強化的作用。但是，只有當Cr3C2顆粒中分散相的含量較低時，其強化效果才顯著。例如，含5％體積分數碳化鉻的複合材料在氬氣中於1500℃時熱壓，得到的抗彎強度和斷裂韌性分別高達600MPa和6.1MPa m1/2。
另外，本研究針對三種不同製程的可靠度進行比較，分別為內在反應法(即本文所使用的方法)、Cr3C2直接添加Al3O2，並在混合後，於1500℃的溫度下加熱一至兩小時，以及在反應中於最高溫的時候將時間延長一小時。根據韋伯所定義的破壞風險參數，分別計算了m值。經由內在反應法形成的材料所得到的m值不僅在三者中最高，相較於氧化鋁在一般情況下的平均m值也較高。

In situ formation of chromium carbide particles, through a solid state reaction between Cr2O3 and SiC, for strengthening Al2O3 has been studied. Three kinds of chromium compound, Cr3Si, Cr3C2 and Cr7C3 and mullite were formed in the alumina matrix. The reaction behaviour during hot pressing depends on heating parameters such as temperature and atmosphere.
In a vacuum environment, the Cr3Si particles formed first and was the dominant dispersed phase below 1550℃, while the Cr7C3 phase was only dominant above 1600℃. The Cr3C2 phase emerged briefly then diminished at temperature ≧ 1500℃. In an argon environment, however, the Cr3C2 phase was the main product component at temperatures ranging from 1450 – 1550 ℃.
The mullite phase formed concurrently through the diffusion of SiO2 phase into the Al2O3 matrix, which is a by-product from the reaction between Cr2O3 and SiC. Incorporating chromium carbide or suicide particles into the Al2O3 matrix induces a strengthening effect. However, only when the content of dispersed phases is low and is mainly of Cr3C2 particles, is the strengthening effect significant. For instance, the composite, containing 5 vol% chromium carbide and hot-pressed at 1500℃ in argon, gives a flexural strength and fracture toughness up to 600 MPa and 6.1 MPa m1/2, respectively.
In addition, this paper compared the reliability between three kinds of different processing, which were in situ formation, add Cr3C2 into Al2O3 and extend 1 hour heating at the highest temperature.
According to the risk-of-rupture that Weibull proposed, we calculated the value of “m” of them. The value of “m” of the in situ formation was the highest of three, and it’s higher than the Al2O3 materials.

摘要........................................i
Abstract..................................iii
誌謝........................................v
目錄.......................................vi
表目錄....................................ix
圖目錄......................................x
第一章 緒論.................................1
1. 研究目的.............................1
第二章 文獻探討.............................3
2.1 氧化鋁(Al2O3)........................3
2.1.1 氧化鋁的簡介...........................3
2.1.2 氧化鋁的特性...........................3
2.1.3 氧化鋁的增強...........................4
2.2 碳化鉻(Chromium Carbide).............7
2.2.1 碳化鉻的簡介...........................7
2.2.2 碳化鉻的特性...........................7
2.2.3 碳化鉻的應用...........................7
2.2.4 碳化鉻的材料性質.......................8
2.3 三氧化二鉻(Cr2O3)....................9
2.3.1 三氧化二鉻的介紹.......................9
2.3.2 三氧化二鉻的特性.......................9
2.3.3 三氧化二鉻的應用.......................9
2.3.4 三氧化二鉻的材料性質...................10
2.4 莫來石 (3Al2O3•2SiO2)...............11
2.4.1莫來石的簡介...........................11
2.4.2莫來石的特性...........................11
2.4.3莫來石的應用...........................12
2.4.4莫來石的材料性質........................12
第三章 實驗步驟............................13
3.1 實驗材料............................13
3.1.1粉末材料...............................13
3.1.2 機器材料..............................13
3.1.3 原理與定律............................17
3.1.4 分析軟體..............................20
3.2 實驗步驟............................21
第四章 結果與討論...........................22
4.1 Cr2C3與SiC的反應....................22
4.1.1在真空中................................22
4.1.2. 在氬氣氛中...........................25
4.2 微觀結構發展.........................26
4.3 機械性能............................29
4.4 破壞應力的統計分析...................31
4.4.1脆性材料的破壞應力......................31
4.4.2韋伯參數(m)的計算與分析.................34
第五章 結論................................40
參考文獻....................................41
Extended Abstract..........................44

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