Effect of SiO<sub>2</sub> addition on the synthesis of hercynite with high purity

DOI Web Site 参考文献8件
  • CHEN Junhong
    School of Materials Science and Engineering, University of Science and Technology Beijing
  • YAN Mingwei
    School of Materials Science and Engineering, University of Science and Technology Beijing
  • SU Jindong
    School of Materials Science and Engineering, University of Science and Technology Beijing
  • LI Bin
    School of Materials Science and Engineering, University of Science and Technology Beijing
  • SUN Jialin
    School of Materials Science and Engineering, University of Science and Technology Beijing
  • CHOU Kuo-Chih
    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing
  • HOU Xinmei
    Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing

抄録

Hercynite as a kind of chrome-free and environmental friendly material is widely investigated. In this work, hercynite with high purity was synthesized using Fe2O3 and Al2O3 as raw material with SiO2 addition under controlled temperature and atmosphere system. The phase and microstructure of the obtained product were investigated using XRD, SEM and TEM techniques. The effect of SiO2 on the synthesis of hercynite with high purity was discussed from both theoretical and experimental aspects. The results show that SiO2 addition lowers the formation temperature of the liquid phase, which promotes Al2O3 to melt into the liquid phase and makes the formation of hercynite possible during the heating stage. During the process of crystallization, SiO2 further facilitates the formation of hercynite by the peritectic reaction. During the fast cooling stage, SiO2 in the form of amorphous silicate exists between hercynite crystals. Therefore hercynite with high purity and dense structure is successfully synthesized. It also shows that 1 mass % SiO2 addition can effectively promote the crystal growth of hercynite and thus lead to dense structure.

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