Influence of yttria addition on the phase transformations of zirconia from zircon ore by carbothermal reduction process

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• 作者：Youguo Xu ; Zhaohui Huang ; ^{huang118@cugb.edu.cn} ; Yan-gai Liu ; Minghao Fang ; Li Yin ; Ming Guan
• 关键词：Yttria addition ; Zircon ; Carbothermal reduction ; Phase transformations ; Partially stabilized zirconia ; Fully stabilized zirconia
• 刊名：Solid State Sciences
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：14
• 期：6
• 页码：730-734
• 全文大小：669 K

文摘

Zircon ore carbothermal reduction with yttria addition has been carried out. The influences of heating temperature and yttria addition on the phase transformations of zirconia from zircon ore by carbothermal reduction have been investigated in detail. The phase transformations of zirconia from zircon ore by carbothermal reduction were monitored by X-ray diffraction. The microstructure and micro-area chemical analysis of the products were characterized by scanning electron microscopy and energy dispersive spectrometer. The chemical states of Zr 3d, Y 3d and O 1s presented in the products of zircon carbothermal reduction with 10?wt % yttria addition were investigated by X-ray photoelectron spectroscopy. The results showed that the optimized heating temperature of zircon carbothermal reduction with no addition was 1600?¡ãC, and the main phase of the products consists of m-ZrO₂, c-ZrO₂, ZrC and ¦Â-SiC. Yttria addition could be introduced into zirconia lattice and caused it to form Y₂O₃ stabilized zirconia. Zirconia in the products would be turned into partially stabilized zirconia with yttria addition from 1?wt % to 5?wt % while it would exist in the form of fully stabilized zirconia with over 8?wt % yttria addition.