Investigate of Phase Compositions and Microstructure of MgO-C through In Situ Nitride

Abstract:

In this paper, the phase compositions and microstructure of MgO-C samples containing Si powder in N₂ sintered at 1350-1500°C were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The α-Si₃N₄, β-Si₃N₄, MgSiN₂ and SiC phases have formed together with MgO and C phases in the sintered samples. The morphologies of β-Si₃N₄ crystals were almost in the shape of rod-like through the α-β phase transformation of Si₃N₄ by Mg-Si-O-N and silicon liquid. The morphologies of α-Si₃N₄ crystals were in the shape of equiaxed. The morphology of MgSiN₂ crystals was in the shape of polyhedron with the size of 5 μm.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 914-917
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.914
• Online since: January 2014
• Authors: Xiao Jun Zhang, Nai Peng, Cheng Ji Deng, Hong Xi Zhu, Wen Jie Yuan
• Keywords: In Situ, MgO-C Refractory, Nitride, Phase Composition

References

[1] M. Guo, S. Parada and P.T. Jones: Eur. Ceram. Soc. Vol. 29 (2009), pp.1053-1060.

[2] Z.A. Nemati, P. Moetakef: Com. Mater. Sci. Vol. (4)39 (2007), pp.723-728.

[3] F. Luo, D.M. Zhu and H. Zhang: Mater. Sci. Eng., A. Vol. 31 (2006), pp.285-259.

[4] M.H. Bocanegra-Bernal and B. Matovic: Mater. Sci. Eng., A. Vol. 527 (2010), pp.1314-1318.

[5] E.Q. He, J.S. Yue and F. Lei: Scripta Mate. Vol. 65 (2011), pp.155-158.

[6] M. Bavand-Vandchali , H. Sarpoolaky and F. Golestani-Fard: Ceram Int. Vol. 35 (2009), p.861–868.

DOI: 10.1016/j.ceramint.2008.03.001

[7] G.H. Peng, G.J. Jiang and H.R. Zhuang: Mater. Sci. Eng., A. Vol. 397 (2005), pp.65-68.

[8] F.L. YU, Y. Bai and J. Du: Synth. cryst. Vol. (6)40 (2011), pp.1595-1601.

[9] D.Y. Chen, B.L. Zhang, H.R. Zhuang: Mater. Lett. Vol. (2)57 (2002), pp.399-402.

[10] Tanaka: Am. Ceram. Soc. Vol. 72 (1989), pp.1656-1660.

[11] I.C. Jung, S.H. Cho, S.W. Na: Mater. Lett. Vol. (26)61 (2007), pp.4843-4846.