Microstructural freezing of highly NIR transparent Y2O3-MgO nanocomposite via pressure-assisted two-step sintering
Microstructural freezing of highly NIR transparent Y2O3-MgO nanocomposite via pressure-assisted two-step sintering
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DOI：
10.1016/j.jeurceramsoc.2019.07.029
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发表时间：
2019-12-01
影响因子：
5.7
通讯作者：
Kim, Do Kyung
中科院分区：
文献类型：
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作者：
Ma, Ho Jin;Jung, Wook Ki;Kim, Do Kyung
Y_2O_3-MgO纳米复合材料在红外窗口和红外整流罩中的应用引起了人们的关注。然而，这种材料相的两相之间的折射率的大的差异诱导不可避免的晶界散射。为了克服这一缺点，必须大大减小晶粒尺寸并消除残余气孔。两步烧结法已被广泛用于生产细晶陶瓷，但需要较长的保温时间和额外的工艺。作为一个强大的方法，压力辅助两步固结的Y2 O3-MgO纳米复合陶瓷进行了研究，以实现全密度，同时保持域的大小。首次获得了压力辅助两步烧结的烧结路径和相应的动力学窗口。通过两步热压工艺有效抑制了晶粒长大，消除了残余气孔，获得了优异的中红外和近红外透过率。结果表明，压力辅助两步烧结是一种很有前途的替代策略，可以减小畴尺寸并实现陶瓷的全密度。
Y2O3-MgO nanocomposite has attracted attention for use in infrared windows and domes. However, the large difference in refractive index between the two phases of this materials phases induces inevitable grain boundary scattering. To overcome this drawback, it is indispensable to greatly reduce the grain size and eliminate residual pores. Two-step sintering has been extensively used to produce fine-grained ceramics, but long incubation time and an additional process are required. As a robust approach, pressure-assisted two-step consolidation of Y2O3-MgO nanocomposite ceramics is investigated to achieve full density while retaining domain size. A sintering path for pressure-assisted two-step sintering and related kinetic window are obtained for the first time. By effectively suppressing grain growth and eliminating residual pores via two-step hot-pressing, outstanding mid-and near-infrared transmittance were achieved. The results indicate that pressure-assisted two-step sintering is a promising alternative strategy that can decrease the domain size and achieve full density of ceramics.