氧化鈮添加對於α相氧化鋁之燒結影響

Effects of Nb2O5 Additives on the Sintering of α-Al2O3

陳世傑(Shih-Chieh Chen)

指導教授 ： 王玉瑞 ； 王錫福 ； 徐永富

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00334

摘要

對於透光性陶瓷而言，晶粒尺寸、孔洞及第二相析出，會對光線的反射及散射行為有很大程度之影響。所以如何控制晶粒成長尺寸、提高燒結體密度、減少孔隙及抑制第二相產生是很重要的課題。
本實驗利用固態反應法將微量Nb2O5添加於Al2O3粉末中，研究Nb元素對於α相Al2O3粉末的燒結緻密化及微結構發展影響。透過不同的前處理條件，將原始粉末(APD-100)區分為APD-100-A、B及C三種型號。實驗結果顯示，添加0.4mol % Nb2O5有助於APD-100-B、C粉末在1350℃/2h燒結條件下，達到優良的緻密性，其相對密度( )分別為97.1% 與 98.2%。且粉末APD-100-C在1650℃/2h的燒結條件下，更可獲得相對密度99.9%之燒結體。此外，Nb元素的添加，會因擴散機制中的氧空缺位置數量提高，而促進晶粒成長，降低晶界數量，進而降低光線的散射行為，使材料透明性提高。

關鍵字

透光性 ； 晶粒尺寸 ； 第二相 ； 燒結 ； 緻密性

並列摘要

To semitransparent ceramics, grain size, pore and second phases make great influence to reflection and scattering behavior of the light. It is a very important subject to control grain size, improve the sintered bulk density, reduce the porosity and suppress the second phase for producing a semitransparent ceramics.
In this study, small amount of Nb2O5 was added to Al2O3 using solid-state method. The effects of Nb element addition and different preceding treatment conditions on the densification and microstructure evolution of α phase Al2O3 powders were studied. Three type of powders APD-100-A, B and C were used as raw materials. The results show 0.4mol% Nb2O5 is helpful for APD-100-B and C powder to obtain fine density sintered at 1350℃ for 2h. The relative density ( ) is 97.1% and 98.2% respectively. And APD-100-C powder can obtain 99.9% of relative density at 1650℃ for 2h. Moreover, Nb additive enhanced the grain growth and reduced the grain bounding and the scattering of the light, and therefore improved the material transparency.

並列關鍵字

Semitransparent ； Grain size ； Second phase ； Sintering ； Densification

參考文獻

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