氧化鋁微粉及其壓實體之θ→α相轉換過程之比較

Comparison of θ→αPhase Transformation in Al_2O_3 Fine Powder and its Compact

李玄閔(Shiuan-Mien Lee) ； 錢敬峰(Jing-Feng Chian) ； 黃啟原(Chi-Yuen Huang)

《鑛冶：中國鑛冶工程學會會刊》 46卷4期 (2002/12) Pp. 112-118+151

https://doi.org/10.30069/MM.200212_46(4).0009

摘要

本實驗採用高純度、高表面積、次微米之θ相氧化鋁粉末作為研究材料，比較壓實體與粉體在θ→α相轉換過程中，晶粒大小、相轉換量及微結構變化等相關特性。綜合過去研究發現，θ至α氧化鋁相轉換過程受顆粒堆積情況影響，堆積越敏密，顆粒間之配位數越高，有利於θ至α氧化鋁相轉換；並由此研究得知，在1050℃因粒子有重排現象發生，使原本壓實體之α氧化鋁之晶柆會延後成長情形在此並不發生，反雵為粉體之α氧化鋁之晶粒延後成長，且成長到達平衡粒徑後，1050℃為最大，1100℃最小，壓實體之α氧化鋁晶粒大小也會大於粉體。

關鍵字

氧化鋁 ； 相轉換 ； 晶徑大小

並列摘要

The material used in the study was θ-phase, high-purity, high-surface area, and submicron Al_2O_3 powder. We compared the compact and powder during θ→α phase transformation in their particle size, the quantity of phase transformation, and the changes of microstructure. In the past research, the process during the phase transformation into α-phase, Al_2O_3 has been affected by the particle packing status. When it was packed densely the particles had higher coordination number, and it would accelerate θ to α-phase transformation. In the research, because the particle packing rearranged at 1050℃, the growth of crystallite in a-phase Al_2O_3 of compact did not postpone, but it postponed in a-phase Al_2O_3 of powder instead. After they had grown into the stable size, the crystallite size of a-phase Al_2O_3 were maximum at 1050℃, minimum at 1100℃, and the crystallite size of a-phase Al_2O_3 of compact were larger than powder.

並列關鍵字

Alumina ； Phase Transformation ； Crystallite Size