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Thermodynamic study and syntheses of β-SiAlON ceramics

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Abstract

Based on the thermodynamic study of β-SiAlON and one section of Si-Al-O-N phase diagram for Si/Al=9 at 1773 K, the pure β-SiAlON (Si6-Z Al Z O Z N8-Z ) ceramics with different Z values (viz. 1.4, 1.8, 2.2, 2.6, 3.0) were synthesized at different temperatures using the pressure-less technique. The relationship of the experimental-saturated Z value (the maximum Z value at a constant temperature) with temperature was then discussed. The experimental results indicated that there is a good linear relationship between Z value and temperature, which is Z= −10.76+0.0071T (R=0.9985). The β-SiAlON stability regions at different temperatures were exhibited in a sketch phase diagram of Si3N4-SiO2-Al2O3-AlN system. In addition, the relationship between experimental-saturated Z value and the lattice parameters was also characterized, and the linear regression results a=7.604+0.02872Z and c=2.908+0.02496Z were obtained, respectively.

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Authors and Affiliations

  1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, China

    PengLi Dong, Mei Zhang, Min Guo & WenChao Li

  2. Chinese Society for Metals, Beijing, 100711, China

    PengLi Dong

  3. College of Engineering, Peking University, Beijing, 100871, China

    XiDong Wang

Authors
  1. PengLi Dong
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  2. XiDong Wang
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  3. Mei Zhang
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  4. Min Guo
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  5. WenChao Li
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Correspondence to XiDong Wang.

Additional information

Supported by the National Natural Science Foundation of China (Grant Nos. 50425415, 50372004) and the National Basic Research Program of China (“973” Program) (Grant No. 2007CB613608)

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Dong, P., Wang, X., Zhang, M. et al. Thermodynamic study and syntheses of β-SiAlON ceramics. Sci. China Ser. E-Technol. Sci. 52, 3122–3127 (2009). https://doi.org/10.1007/s11431-009-0136-y

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  • DOI: https://doi.org/10.1007/s11431-009-0136-y

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