二階段燒結對於α相氧化鋁粉末之緻密化及顯微結構發展影響

Effects of Two-step Sintering on the Microstructure and Densification Evolution of α-phase Alumina Powders

陳世傑(C.S. Chen) ； 王玉瑞(Y.R. Wang) ； 王錫福(S.F. Wang)

《鑛冶：中國鑛冶工程學會會刊》 50卷3期 (2006/09) Pp. 122-127

https://doi.org/10.30069/MM.200609_50(3).0013

摘要

相較於一般的傳統燒結方式，二階段燒結方式可以有效的控制燒結中的各種擴散機制，並能有效的抑制燒結後期中緻密化所伴隨的異常晶粒成長。本實驗以1400℃做為第一階段燒結溫度，1300℃做第二階段燒結溫度，以持溫時間做為燒結參數，研究其緻密化和晶粒成長尺寸之變化，實驗結果顯示在第一階段燒結中，所達到之燒結體密度對於緻密化及晶粒成長有明顯影響，本實驗中以1400℃／60min－1300℃／168h二階段燒結條件下得到最佳結果，其晶粒尺寸可抑制在460nm之內，相對理論密度則可高於96%。

關鍵字

二階段燒結 ； 擴散機制 ； 晶粒成長 ； 緻密化

並列摘要

In the present work, the grain growth and densification behavior of α-alumina powders have been investigated by two-step sintering method. The Al_2O_3, green bodies were first heated to 1400°C to achieve an intermediate density (＞ 75% of theoretical density), then cooled down and held at 1300°C for 2~168h until they became fairly dense. Experimental results indicated that the two-step sintering method was successful in enhancing densification and exhibiting grain growth. The best sintering conditions of 1400°C/60min~1300°C/168h were obtained to get smallest average grain size (＜460nm) and the greatest fired density (＞ 96% theoretical density).

並列關鍵字

Two-step sintering ； Diffusion mechanism ； Grain size ； Densification