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Synthesis of MgAl2O4-SiAlON Composite Powders by Carbothermal Nitritdation of Forsterite and Alumina

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Abstract:

In this paper, the synthesis of MgAl2O4-SiAlON composite powders by forsterite, alumina and carbon black was studied. The samples were calcined under nitrogen atmosphere at 1500 °C, 1600 °C, 1650 °C for 3 hrs respectively. The phase compositions and microstructure of the synthesized powders were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The result shows that an optimal alumina/forsterite content was a molar ratio of 2.0:1.0, the products consisted mainly of MgAl2O4 and Si3Al3O3N5 at 1500 °C, MgAl2O4 and Mg1.25Si1.25Al2.5O3N3 at 1600 °C and 1650 °C. The temperature can improve the formation of the octahedral spinel and flakiness Mg1.25Si1.25Al2.5O3N3.

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Periodical:

Advanced Materials Research (Volumes 634-638)

Pages:

2388-2391

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.634-638.2388

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Online since:

January 2013

Authors:

Hong Juan Duan, Hong Xi Zhu, Cheng Ji Deng, Wen Jie Yuan, Ping Liang

Keywords:

Carbothermal Nitridation, Forsterite, MgAl2O4-SiAlON

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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