本研究以油酸分散氫氧化鋁膠製造之奈米氧化鋁粉末作為起使原料，分別添加0wt%、15wt%及30wt%的氫氧化鋁膠混合後，過100目篩造粒之，再以單軸加壓至200MPa，得到的生胚經過1250℃至1450℃間之燒結溫度持溫2小時燒結，得到不同之氧化鋁燒結體，再對燒結體進行視密度、體積收縮率、顯微結構與結晶粒徑分布，以獲得燒結體的性質。
由油酸分散氫氧化鋁膠製造之奈米氧化鋁粉末，在經過1200℃持溫20分鐘後，得到奈米級純α相氧化鋁粉末，其X光繞射測定晶徑為40nm，其比表面積測定結果為40.4m2/g，換算粒徑約為37nm，在SEM顯微照片上以費氏直徑量测平均為55nm。而實驗比較之外α-氧化鋁粉末，其X光繞射測定晶徑為60nm，其比表面積測定結果為35.7m2/g，換算粒徑約為42nm，在SEM顯微照片上以費氏直徑量测平均為110nm。
在胚體燒結過程中，添加氫氧化鋁膠之胚體均有較高的生胚密度提昇，而以油酸分散製造之α氧化鋁粉末粉體型態均勻，凝聚及蠕蟲狀顆粒較少的粉體中，添加氫氧化鋁膠體，對生坯密度的提昇及其燒結體的緻密化表現均有較佳的效果。反之，在凝聚較多及帶有蠕蟲狀結構的外購α氧化鋁粉末中，氫氧化鋁膠的添加，對其燒結緻密化的助益效果並不明顯。研究中發現未添加膠體之α-氧化鋁胚體，雖起始生坯密度較低，可在1450℃持溫2小時得到相對密度96%，中位結晶粒徑約1µm的燒結體。

This research was study the sinterting behavior of two kinds nanometer-sized α-alumina powders.One is the nanometric sized α-alumina powders manufactured from hydroxide gel precursor mixing with oleic.Another kinds of nanometer-sized α-alumina powders was bought from ALFA company and was named n44652(Alfa) powders.
Green body was prepared by mixing aluminum hydroxide gel into α-alumina and pelleted with 100 mesh screen.The drying green body were formed with 200 MPa automatic uniaxial hydraulic press. These green bodies were sintered at 1250℃ to 1450℃for 2 hours duration and furnace-cooling to room temperature.The sintered ceramic bodies were identified by relative apparent density,volume shrinkage rate ,micro-structure obsvervation and grain size distribution measurement.
The results indicated the α-alumina powders manufactured from aluminum hydroxide gel mixed with oleic acid and heated until 1200℃ for 20 mins,the average size of this α-alumina powders was 40nm from XRD peak broaden measurement.The BET surface srea was 40.4m2/g,and the average grain size from SEM photo was 55nm.The ALFA company n44652(Alfa) powder was indicated that the average size of this α-alumina powders of individual crystal diameters was 60nm,the BET surface area was 35.7m2/g,and the average grain size for SEM photo was 110nm.
In the process of sintering,we found that all green bodies adding aluminum hydroxide gel had more dance green body . Less of the agglomerates in our alumina powders had the more dance sintered bodies than that of ALFA company powders.The best sample sintering of α-alumina green body,the relative density sintered at 1450℃ for 2hours were calculated 96% and the grain size of that was indentified 1μm.

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