Influence of Preparation Parameter on the Grain Size of LaB₆ Powder Synthesized by SHS with Reduction Process

Abstract:

Self-propagating high-temperature synthesis with reduction process was used to fabricate LaB6 ceramic powder from La2O3-B2O3-Mg system. The combustion reaction carried out in inert atmosphere (Ar) and the combustion temperature was about 1600°C. The products were washed with dilute hydrochloric acid and distilled water, respectively, to remove LaBO3, Mg3B2O6, MgO and other impurities. The influence of compact pressure and addition of SHS diluent on the grain size was studied. The result indicates that as the compact pressure increased, the mean size of powder decreased gradually. The addition of diluents reduced the synthesis temperature, and as the amount of diluent increased, the grain size of LaB6 powder was found to reduce continuously. Microstructure analyses show that the mean grain size of LaB6 powder prepared by SHS with reduction process is less than 500 nm, which is finer compared with the grain size prepared by traditional process.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 351-354
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.351
• Online since: April 2010
• Authors: Ni Jiang, Wei Min Wang, Zheng Yi Fu, Hao Wang, Yu Cheng Wang, Jin Yong Zhang
• Keywords: Compact Pressure, Grain Size, LaB₆

References

[1] M. Gesley and L.W. Swanson: Surf. Sci. Vol. 146 (1984), p.583.

[2] V. Craciun and D. Craciun: Appl. Surf. Sci. Vol. 247 (2005), p.384.

[3] L.W. Swanson, M.A. Gesley and P.R. Davis: Surf. Sci. Vol. 107 (1981), p.263.

[4] S.Q. Zheng, G. H Min, Z.D. Zou, et al.: J. Chin. Cera. Soc. Vol. 29 (2001), p.128.

[5] S.Q. Zheng, G. H Min, Z.D. Zou, et al: Acta. Metall. Sinica. Vol. 37 (2001), p.420.

[6] C.L. Yeh W.H. Chen, C.C. Hsu, et al: J. Alloys Compd. Vol. 395 (2005), p.53.

[7] B.K. Yen, T. Aizawa and J. Kihara: J. Am. Ceram. Soc. Vol. 81 (1998), p. (1953).

[8] K. Das, Y.M. Gupta, A. Bandyopadhyay, et al: Mater. Sci. Eng. A. Vol. 426 (2006), p.147.

[9] J. Trambukl and Z.A. Munir: J. Am. Ceram. Soc. Vol. 73 (1990), p.1240.

[10] C.L. Yeh, W.H. Chen, C.C. Hsu, et al: J. Alloys Compd. Vol. 432 (2007), p.90.

[11] C.L. Yeh and G.S. Teng: J. Alloys Compd. Vol. 429 (2007), p.126.

[12] W.M. Wang, Z.Y. Fu, H. Wang, et al: J. Mater. Process. Technol. Vol. 128 (2002).