Thermal and optical properties of transparent magnesium oxide ceramics fabricated by post hot-isostatic pressing
Thermal and optical properties of transparent magnesium oxide ceramics fabricated by post hot-isostatic pressing
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DOI：
10.1016/j.jeurceramsoc.2005.06.011
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发表时间：
2006
影响因子：
5.7
通讯作者：
K. Itatani;T. Tsujimoto;A. Kishimoto
中科院分区：
文献类型：
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作者：
K. Itatani;T. Tsujimoto;A. Kishimoto
采用平均粒径为57 nm的无团聚MgO粉料，采用热等静压（HIP）技术制备了MgO透明陶瓷。在1600°C下无压烧结5 h，MgO压坯的相对密度为96.7%，平均晶粒尺寸为10.7μm。在1500 ~ 1600°C的温度范围内对无压烧结体进行热等静压处理（0.5h），MgO陶瓷的相对密度达到99.9%以上，且透光率高。在1500 ~ 1600°C的热等静压温度范围内，平均晶粒尺寸从132 μm增大到199μm。在1600°C热等静压处理0.5h的MgO样品的在线透射率随着波长从500增加到900 nm而从52%增加到55%，并且与MgO单晶的在线透射率相比对应于约65%。该MgO样品的热导率达到53.5Wm-1 K-1，而热扩散率随着测试温度的升高逐渐降低，达到0.0416cm2s-1。
The transparent magnesium-oxide (MgO) ceramic could be fabricated by a hot-isostatic press (HIP) technique of pressureless-sintered MgO compact, using non-agglomerated MgO powder with the average primary particle size of 57nm. The relative density and average grain size of MgO compact pressureless-sintered at 1600°C for 5h were 96.7% and 10.7μm, respectively. Owing to the HIPing operation (0.5h) of pressureless-sintered compact at a temperature between 1500 and 1600°C, relative densities of the MgO ceramics attained 99.9% or more with light transmission. The average grain size increased from 132 to 199μm with HIPing temperature from 1500 to 1600°C. The in-line transmission of the MgO specimen HIPed at 1600°C for 0.5h increased from 52 to 55% with increasing wavelength from 500 to 900nm and corresponded to approximately 65%, compared to that of the MgO single crystal. The thermal conductivity of this MgO specimen attained 53.5Wm−1K−1, whereas the thermal diffusivity decreased gradually to reach 0.0416cm2s−1with increasing test temperature up to 873K.