(1. 東北大學 材料各向異性與織構教育部重點實驗，沈陽110004；
2. 西澳大利亞大學 機械工程學院，Crawley WA6009；
3. 沈陽光大照明電器有限公司，沈陽110056)
摘 要: 通過摻雜不同濃度Tb2O3的重稀土氧化物，研究不同燒結溫度下二元MgO-Tb2O3對氧化鋁陶瓷電弧管組織與性能的影響，并與MgO-CaO摻雜體系進行比較。結果表明：在相同工藝條件下，CaO摻雜樣品晶粒組織粗大且分布不均勻；添加重稀土氧化物Tb2O3可降低氧化鋁陶瓷電弧管的晶體顆粒尺寸；在較低燒結溫度下，摻雜Tb2O3能夠細化晶粒、提高微觀組織均勻性、消除晶粒異常生長及有效地改善透明氧化鋁陶瓷電弧管的力學性能。
關鍵字: 氧化鋁電弧管；Tb2O3摻雜；微觀組織；力學性能
properties of alumina arc tube
（1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University,
Shenyang 110004, China;
2. School of Mechanical Engineering, University of Western Australia, Crawley, WA6009, Australia;
3. Shenyang Guang Da Lighting Equipment Co. Ltd., Shenyang 110056, China）
Abstract:The effect of Tb2O3 doping with different concentrations on the microstructures and mechanical properties of alumina arc tube was investigated under different sintering temperatures, and the influence of CaO doping alumina arc tube was also investigated for comparison. The results show that, contrasting to the coarse grain size and uniform microstructures of the alumina arc tube doped with CaO, heavy rare-earth Tb2O3 doping can decrease the grain size and enhance densification effectively. At relative lower sintering temperature, Tb2O3 doping can further eliminate the abnormal grain growth and improve the microstructure homogeneity and mechanical properties of transparent alumina arc tube.
Key words: alumina arc tube; Tb2O3 doping; microstructure; mechanical property
