Fabrication of sub-micrometer MgO transparent ceramics by spark plasma sintering
Fabrication of sub-micrometer MgO transparent ceramics by spark plasma sintering
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DOI：
10.1016/j.jeurceramsoc.2017.06.021
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发表时间：
2017-12
影响因子：
5.7
通讯作者：
Nan Jiang;R. Xie;Qiang Liu;Jiangxu Li
中科院分区：
文献类型：
--
作者：
Nan Jiang;R. Xie;Qiang Liu;Jiangxu Li
以LiF为烧结添加剂，采用火花等离子烧结（SPS）法制备了MgO透明陶瓷。研究了添加量和SPS条件（即烧结温度和加热速率）对制备的MgO陶瓷的光学透明度和微观结构的影响。结果表明，LiF有利于致密化和晶粒生长。因此，在中等温度和低压条件下，MgO陶瓷可以很容易地致密化。此外，MgO陶瓷的透明度和微观结构与温度和加热速率密切相关。当煅烧温度为900℃，升温速率为100℃/min，压力为30 MPa时，LiF含量为1 wt%的MgO陶瓷在3 ~ 5 μm范围内的平均在线透过率达到85%，平均晶粒尺寸为~ 0.7 μm。
Transparent MgO ceramics were fabricated by spark plasma sintering (SPS) of the commercial MgO powder using LiF as the sintering additive. Effects of the additive amount and the SPS conditions (i.e., sintering temperature and heating rate) on the optical transparency and microstructure of the obtained MgO ceramics were investigated. The results showed that LiF facilitated rapid densification and grain growth. Thus, the MgO ceramics could be easily densified at a moderate temperature and under a low pressure. In addition, the transparency and microstructure of the MgO ceramics were found to be strongly dependent on the temperature and heating rate. For the MgO ceramics sintered at 900 °C for 5 min with the heating rate of 100 °C/min and the pressure of 30 MPa from the powders with 1 wt% LiF, the average in-line transmittance reached 85% in the range of 3 – 5 μm, and the average grain size is ∼0.7 μm.