Effects of sintering additives on preparation of CaF2 transparent ceramics
Effects of sintering additives on preparation of CaF2 transparent ceramics
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DOI：
10.1007/s11595-011-0386-y
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
G. Zhi;B. Mei;Weibing Zhou;Jinghong Song;Weiwei Li;Yan Zhang
中科院分区：
文献类型：
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作者：
G. Zhi;B. Mei;Weibing Zhou;Jinghong Song;Weiwei Li;Yan Zhang
研究了不同烧结助剂对CaF2透明陶瓷制备的影响。以化学沉淀法合成的CaF2纳米粉体为原料，采用真空烧结和热等静压（HIP）方法制备透明CaF2陶瓷。使用 X 射线衍射、透射电子显微镜 (TEM)、扫描电子显微镜 (SEM) 和分光光度计对纳米粉末和透明陶瓷进行了研究。实验结果表明，所得纳米粉体呈正态分布，粒径约为30 nm；以LiF和NaF为烧结助剂制备的CaF2透明陶瓷在1100 nm处的透过率分别为39%和26%，对应的平均晶粒尺寸为188 μm和44 μm。传输损失可归因于残留的闭孔率。烧结机理为前期液相烧结，后期固相烧结，以及锂离子和钠离子固溶在CaF2晶格结构中。
The effects of different sintering addictives on the preparation of CaF2transparent ceramics were studied. Transparent CaF2ceramics were fabricated by vacuum sintering and hot isostatic pressing (HIP) method, using CaF2nanopowders synthesized by chemical precipitation method as raw materials. The nanopowders and transparent ceramics were studied using X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and spectrophotometer. The experimental results indicated that the obtained nanopowders presented normal distribution with grain size about 30 nm; transmittance of CaF2transparent ceramics was 39% and 26% at 1100 nm for LiF and NaF as sintering addictives, respectively, with corresponding mean grain size 188 μm and 44 μm. Loss of transmission could be attributed to the residual closed porosity. Sintering mechanism was liquid-phase sintering at pre-stage, then solid-phase sintering at later stage, as well as solid solution of lithium ions and sodium ions in the CaF2lattice structure.