Transparent polycrystalline alumina using spark plasma sintering: Effect of Mg, Y and La doping
Transparent polycrystalline alumina using spark plasma sintering: Effect of Mg, Y and La doping
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DOI：
10.1016/j.jeurceramsoc.2009.12.001
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发表时间：
2010-04
影响因子：
5.7
通讯作者：
M. Stuer;Zhe Zhao;U. Aschauer;P. Bowen
中科院分区：
文献类型：
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作者：
M. Stuer;Zhe Zhao;U. Aschauer;P. Bowen
透明多晶氧化铝（PCA）是一种很有前途的蓝宝石替代品。然而，其光学性质高度依赖于晶粒尺寸和残余孔隙度，这需要控制真实的在线透射率（RIT），其对于可能的应用足够高。为了实现高RIT，通常使用掺杂以及压力辅助烧结。在这项研究中，放电等离子烧结（SPS）和掺杂进行了研究。采用系统的实验设计，研究了Mg、Y、La单掺或共掺（75- 450 ppm）以及SPS烧结压力和温度对PCA的RIT和晶粒尺寸的影响。采用优化的烧结参数，对于几乎所有的掺杂策略，对于0.8mm厚的样品，在可见波长（640 nm）处获得了>50%的RIT。对于三重掺杂的样品，在总掺杂剂水平为450 ppm时的最佳RIT为57%。这些结果明显优于先前发表的SPS研究，并说明SPS烧结氧化铝可以在各种掺杂和烧结条件下获得高的和可重复的光学透射率。
Transparent polycrystalline alumina (PCA) is a promising replacement for sapphire. Its optical properties however are highly dependent on the grain size and residual porosity which need to be controlled for real inline transmittances (RIT), that are high enough for possible applications. To achieve high RITs, doping as well as pressure assisted sintering is often used. In this study spark plasma sintering (SPS) and doping are investigated. A systematic experimental design is used to study the influence of Mg, Y and La single or co-doping (75–450ppm) as well as the SPS sintering pressure and temperature on the RIT and grain size of PCA. Using optimized sintering parameters, RITs of >50% were attained in the visible wavelength (640nm) for 0.8mm thick samples for almost all doping strategies. The best RIT of 57% was for triple-doped samples at a total dopant level of 450ppm. These results are significantly better than previously published SPS studies and illustrate that SPS sintered alumina can attain high and reproducible optical transmittances under various doping and sintering conditions.