Transparent polycrystalline MgAl2O4 ceramic fabricated by spark plasma sintering: Microwave dielectric and optical properties
Transparent polycrystalline MgAl2O4 ceramic fabricated by spark plasma sintering: Microwave dielectric and optical properties
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放电等离子烧结透明多晶MgAl2O4陶瓷：微波介电和光学特性
DOI：
10.1016/j.ceramint.2012.09.006
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发表时间：
2013-04
影响因子：
5.2
通讯作者：
Wu, Jiamin
中科院分区：
文献类型：
--
作者：
Lei, Wen;Xu, Yong;Wang, Xuehua;Wu, Jiamin
采用放电等离子烧结（SPS）技术，以自制的MgAl 2 O 4纳米粉体为原料，在1250°C ~ 1375°C温度范围内烧结制备了MgAl 2 O 4透明多晶陶瓷，研究了陶瓷的光学性能和微波介电性能。结果表明，随着烧结温度的升高，在高达1275°C时发生晶粒生长和致密化，并且在高于1350°C时发生快速晶粒和孔生长。同轴光透射率随致密化而增加，随晶粒/孔生长而降低，其在550 nm波长处可高达70%，在2000 nm波长处可高达82%。随着烧结温度的升高，Q×f和介电常数ε r值先增大后减小，τ f值几乎与烧结温度无关，保持在−77 ~ − 71 ppm/°C之间。在1325°C、20 min条件下放电等离子烧结制备的MgAl 2 O 4透明陶瓷具有最佳的微波介电性能（εr=8.38，Q×f=54，000 GHz，τf=− 74 ppm/°C）。
The optical properties and microwave dielectric properties of transparent polycrystalline MgAl2O4ceramics sintered by spark plasma sintering (SPS) through homemade nanosized MgAl2O4powders at temperatures between 1250°C and 1375°C are discussed. The results indicate that, with increasing sintering temperatures, grain growth and densification occurred up to 1275°C, and above 1350°C, rapid grain and pore growth occurred. The in-line light transmission increases with the densification and decreases with the grain/pore growth, which can be as high as 70% at the wavelength of 550nm and 82% at the wavelength of 2000nm, respectively. As the sintering temperature increases, Q×f and dielectric constant εrvalues increase to maximum and then decrease respectively, while τfvalue is almost independent of the sintering temperatures and remains between −77 and −71ppm/°C. The optimal microwave dielectric properties (εr=8.38, Q×f=54,000GHz and τf=−74ppm/°C) are achieved for transparent MgAl2O4ceramics produced by spark plasma sintering at 1325°C for 20min.
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影响因子：
2.7
作者：
A. Feteira;D. Sinclair;M. Lanagan
通讯作者：
A. Feteira;D. Sinclair;M. Lanagan
影响因子：
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作者：
GUREVICH, VL;TAGANTSEV, AK
通讯作者：
TAGANTSEV, AK
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2.7
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影响因子：
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影响因子：
2.6
作者：
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通讯作者：
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