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研究生:趙賢文
論文名稱:微波材料處理及加熱機制之探討
論文名稱(外文):Microwave-Materials Processing and Heating Mechanism
指導教授:張存續
學位類別:博士
校院名稱:國立清華大學
系所名稱:物理系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:英文
論文頁數:75
中文關鍵詞:共振腔微擾方法離子晶體微波
外文關鍵詞:microwaveIonic crystalperturbation methodresonant cavity
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  • 被引用被引用:1
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我們提出了一個單模式TM010空腔以釐清非熱效應, 且使用一個功率放大器為波源, 波源能量入射進入腔體, 這腔體我們有詳細討論其機制。 我們以此共振腔為基礎來量測介電係數及磁性係數藉由改良型的微擾方法, 這個改良型的微擾方法,相對上, 可容許較大樣品體積及較高的介電係數變化。
此外, 我們也利用此共振腔來加熱離子晶體(NaCl, KCl,……), 我們發現一個有趣的物理現象, 當離子晶體加熱至熔點以上時, 產生了雙層粒子環形煙霧, 它是類似水龍捲現象。這現象主要是因未來自離子晶體粒子受到離心作用力及電磁作用力交互影響, 離子晶體粒子束縛於兩個半徑之內而造成此一現象。
最後一部份工作, 我們發現離子晶體在微波場作用之下, 離子晶體熔點比傳統加熱熔點還來的低, 我們使用9種離子晶體, 這9種離子晶體在微波場下期熔點都會下降, 我們認為微波場造成離子晶體電荷分佈變形,以至於造成了熔點下降。
We have proposed a cavity with the single-mode (TM010) operation and uncovered the intriguing non-thermal microwave effect. An experiment was conducted using an amplifier rather than an oscillator as the radiation source which was injected into the applicator to enhance the electromagnetic fields. The characteristics of the applicator are discussed and the mechanism of field enhancement are illustrated and explained.
We also proposed a modified calibration method to determine the complex permittivity and permeability of material based on the cavity-perturbation method. It allows a test sample with relative large in volume or high in dielectric constant. The theory is validated with a full wave solver (HFSS) and an experiment was conducted. A sample of SiC was heated using high-power microwave and characterized with low-power signal, all operating in the same cavity but different in time sequence. It facilitates the study of both microwave/material processing and material characterization.
In addition, we reported an intriguing phenomenon - the particles are spouting in a strong microwave field, called the particlespout. It is similar to a waterspout, an intense columnar vortex appeared a funnel shape, is a natural wonder that attracts public attention even today. These ionic crystals (NaCl, KCl, …...) are heated in a microwave applicator with silicon carbide as the susceptor. Beyond the melting point, the particles begin to escape from the surface and move upward due to thermal convection. These particles form a funnel shape as expected but, interestingly, they have two layers. In comparison with convention furnace heating, only a single layer but unstable columnar vortex can be observed. The microwave field in the cavity is analyzed and displayed. Various configurations of the susceptors which all result in the similar behavior are studied. A theoretical model is proposed which attributes the observed phenomenon to the rotational kinematics together with the ponderomotive force. These two effects confine the particles to the inner and outer bounds, respectively.
The final work, we employed microwave to process material. The microwave heating takes shorter processing time and lower processing temperature than conventional heating. The microwave-material processing is difficult to characterize because most of the researchers use over-moded applicators as well as free-running oscillators to achieve better uniformity and lower costs. This study reports the reduction of the melting points for nine alkali halide ionic crystals in the microwave fields. The melting points were determined from the abrupt change of the reflected wave due to the detuning of the input microwave frequency and the resonant frequency of the cavity during the phase transition. The reduction of the melting points were systematically characterized, where the lowest reduction is less than 2% for lithium bromide (LiBr) and the highest reduction is greater 5% for potassium fluoride (KF). The bond length of the ionic crystal strongly correlated to the reduction ratio of the melting temperature. A theoretical model is proposed which considers the energy drop due to the electric dipole of the ionic crystal interacting with the applied microwave fields. The proposed model qualitatively explains the melting point reduction, but more elaborated theory is still needed.

Chapter 1 Fundamental Concepts of Proposed Cavity 1
1.1 Basic Structure of Proposed Cavity 2
1.2 Distribution of EM-Field of Proposed Cavity 4
1.3 Experiment Setup and Results 7
Chapter2 Direct Measurement of Dielectric Properties 12
2.1 Conventional Cavity Perturbation Method 12
2.2 Proposed Modified Cavity Perturbation Method 13
2.3 HFSS Simulation 19
2.4 Experimental Setup and Results 21
Chapter 3 Dual-layer Particlespout in a Proposed Cavity 26
3.1 Basic Description and Theory of Dual-layer Particlespout 26
3.2 Experimental Setup 30
3.3 Observation of Dual-layer Particlespout 31
3.4 Particle Size and Distribution 34
Chapter 4 Microwave Induced Melting Point Reduction for Ionic Crystals 37
4.1 Introduction of Theoretical Model 39
4.2 Experimental Setup 48
4.3 Determine the Melting Temperature and Experimental Results 51
4.4 Discussion of Experimental Results 58
Chapter 5 Conclusions 62
References 65

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