2004-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/692507摘要：奈米陶瓷粉末燒結比起傳統陶瓷粉末複雜，尤其為了達到完全緻密化且維持在奈米粒徑的條件，又常使用加壓或添加抑制劑等輔助方法，更增添掌握燒結機制之困難，目前尚無實際且有效的模型描述奈米陶瓷材料在燒結過程中的變化。 本研究室由一般動力學角度出發所推導而得的「主導曲線模型」，已證實在微米及次微米級之陶瓷粉末之常壓燒結方面，比由全期燒結模型為基礎所發展出的「主導燒結曲線模型」更能準確估計視燒結活化能及準確預測燒結體密度變化。本計劃提議進一步探討此模型於奈米陶瓷燒結上的適用性，利用奈米銳鈦礦相TiO2及奈米剛玉相Al2O3粉末進行燒結實驗，透過不同壓力或不同燒結抑制劑添加量的奈米燒結主導曲線，建立「壓力/或添加量--時間溫度函數--相對密度/或轉換量」的三維「主導曲面」。預期所得的研究成果能增進我們對奈米陶瓷燒結機制之了解，也能藉由建立之曲面模型來準確預測最佳之燒結溫度、時間、壓力或其他影響變因。<br> Abstract: Nanocrystalline ceramics owns some extraordinary properties, such as: superplasticity (at relatively low temperature,) bacteria-free, and self-cleaning, etc. Yet to make a ceramic bulk material is not easy – the sintering process becomes much more complicated than traditional ceramics. Furthermore, to achieve fully dense sample while maintain the nanoparticles sizes, we usually adopt high pressure or add inhibitors making it more difficult to understand sintering mechanisms. No practical and effective model existed that can be used to describe the variations happened in sintering process. A two-dimension master curve model (MCM) developed by us during the past few years had been proved very effective in the analysis of micron and submicron ceramic sintering. The MCM is more accurate and easier in the prediction of sintering process than the previous master sintering curve model (MSC). We have preliminarily showed that the 2-D MCM can be used to analyze the sintering behaviors of a nanocrystalline TiO2 powder recently. We here propose using a 3-D multivariable master curve surface model (MCS) to analyze the sintering of n-TiO2 and n-Al2O3 powder. We want to construct a 3-D (i.e., Pressure/additives, function of time and temperature, and relative density) MCS that can adequately describe the relationship between these factors. The goal is not just to prove the feasibility of this new model, but also to increase our understanding in the sintering of nanocrystalline materials.奈米陶瓷燒結主導曲線主導曲面nanoceramicssinteringmaster curvemaster surfaceanatasecorundum