Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite and Al2O3 corundum
Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite and Al2O3 corundum
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DOI：
10.1111/jace.15281
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发表时间：
2018-03
影响因子：
3.9
通讯作者：
N. A. Gaida;N. Nishiyama;A. Masuno;U. Schürmann;Christopher Giehl;Oliver Beermann;H. Ohfuji;J. Bednarčík;E. Kulik;A. Holzheid;T. Irifune;L. Kienle
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文献类型：
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作者：
N. A. Gaida;N. Nishiyama;A. Masuno;U. Schürmann;Christopher Giehl;Oliver Beermann;H. Ohfuji;J. Bednarčík;E. Kulik;A. Holzheid;T. Irifune;L. Kienle
制备了由三斜Al2SiO5蓝晶石（91.4 vol%）和Al2O3刚玉（8.6 vol%）组成的透明多晶纳米陶瓷，温度为10 GPa，温度为1200 ~ 1400℃。这些材料是由采用空气动力学悬浮技术制备的Al2O3-SiO2玻璃直接转化而成的。在10gpa和1200℃条件下获得的材料在645 nm波长处的光学透明度最高，样品厚度为0.8 mm，实际在线透射值为78%。样品呈等晶织构，平均晶粒尺寸为34±13 nm。光学透明度随组成相平均晶粒尺寸的减小而增大。基于经典理论的晶界散射模型很好地解释了实际直线透射率与晶粒尺寸之间的关系。
Transparent polycrystalline nanoceramics consisting of triclinic Al2SiO5 kyanite (91.4 vol%) and Al2O3 corundum (8.6 vol%) were fabricated at 10 GPa and 1200-1400°C. These materials were obtained by direct conversion from Al2O3-SiO2 glasses fabricated using the aerodynamic levitation technique. The material obtained at 10 GPa and 1200°C shows the highest optical transparency with a real in-line transmission value of 78% at a wavelength of 645 nm and a sample-thickness of 0.8 mm. This sample shows equigranular texture with an average grain size of 34 ± 13 nm. The optical transparency increases with decreasing mean grain size of the constituent phases. The relationship between real in-line transmission and grain size is well explained by a grain-boundary scattering model based on a classical theory.