本研究旨在探討添加硼矽玻璃對BaWO4 (BW)在束縛燒結下緻密行為之影響。BW在束縛燒結下無法於950oC燒結緻密，燒結活化能分析顯示BW在束縛燒結下的緻密機制發生轉變，造成其產生嚴重的緻密延遲。為了解決緻密延遲，透過添加硼矽玻璃至BW中，形成硼矽玻璃+BW (BWG)玻璃陶瓷系統，BWG在束縛燒結下於950oC即可達到良好的緻密度。
BWG於束縛燒結下的緻密溫度高於自由燒結100oC，本研究顯示BWG於束縛燒結下，具有與自由燒結時相同的緻密機制及等向性的微結構。為了提升BWG於束縛燒結下的緻密度，可藉由在Z軸向施加壓應力，在750-900oC使束縛燒結下的BWG具有與自由燒結相同的緻密速率所需之單軸向壓應力為100-900 kPa，此結果與利用構成方程式(Constitutive equations)中的等向性模型計算之理論值相符。活化能分析結果顯示BWG的燒結緻密機制由硼矽玻璃的黏滯流動(Viscous flow)所控制，推測硼矽玻璃的黏滯流動可使BW粉體重排(Rearrangement)，使BWG能夠在束縛燒結下於950oC達到緻密。

The effects of borosilicate glass on the densification behavior of BaWO4 (BW) under constrained sintering have been studied. BW cannot be densified under constrained sintering at 950oC. Activation energy analysis shows that the densification mechanism of BW under constrained sintering has been changed. It results in a severe densification retardation of BW under constrained sintering. To solve this problem, we added borosilicate glass into BW, which forms borosilicate glass + BW (BWG) system. BWG system can be densified under constrained sintering at 950oC. Insignificant change in densification mechanism and isotropy in microstructure are observed during free and constrained sintering. The required uniaxial stress to densify BWG under constrained sintering at 750-900oC is in the range of 100-900 kPa, consistent with those calculated by using an isotropic viscous model. Activation energy analysis shows that the densification of BWG under constrained sintering is mainly achieved by the viscous flow of borosilicate glass and the rearrangement of BW particles.

一、前言 1
二、實驗方法 6
2.1 粉體合成及試片製備 6
2.1.1 粉體合成 6
2.1.2 試片製備 7
2.2 性質量測 8
2.2.1 緻密度與收縮性質量測 8
2.2.2 X光繞射分析 8
2.2.3 顯微結構觀察與統計分析 8
三、結果與討論 10
3.1 BW的束縛燒結 10
3.1.1 緻密行為 10
3.1.2 燒結活化能 11
3.1.3 顯微結構分析 12
3.2 硼矽玻璃與BW間無明顯反應發生 12
3.2.1 結晶相之鑑定 12
3.2.2 顯微結構觀察 13
3.3 BWG的束縛燒結 14
3.3.1 BWG與ZrO2間無界面反應 14
3.3.2 緻密行為 14
3.3.3 燒結活化能 15
3.3.4 晶粒方向分析 17
3.3.5 外加應力 18
3.3.6 燒結行為分析 19
四、結論 24
五、參考文獻 25

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