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Your search keyword '"Yin, Rui-Ming"' showing total 12 results
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12 results on '"Yin, Rui-Ming"'

11. Preparation and sintering of nano Fe coated Si3N4 composite powders.

Author

Yin, Rui-ming, Fan, Jing-lian, and Liu, Xun

Abstract

Fe/Si3N4 composite powder was synthesized by the heterogeneous precipitation-thermal reduction process, and then pressed into flakes under a pressure of 10 MPa. Flakes were sintered by pressureless and hot-pressing at 1 600 °C under 0.1 MPa N2. The chemical composition, phases and microstructure of composite powder and sintered flakes were investigated by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the structure of composite powders is Si3N4 coated by nano Fe. The crystal phases of sintered flakes by pressureless are Fe(Si) compound, SiC and Si3N4. The crystal phases of the sintered samples by hot-pressing are Fe, Fe(Si) compound and Si3N4. It is found that crystal phases flakes obtained by pressureless and hot-pressing are very different. [ABSTRACT FROM AUTHOR]

Published
2009
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12. The Effect of Sintering Temperature on the Mechanism of Metal Composite and Self Toughing and Toughening Si3N4 Ceramics Coupling

Author

Yin, Rui Ming, Ji, Fu Bao, Hou, Qing Lin, Li, Jing, and Chen, Lin Zhang

Abstract

Fe-Mo/Si3N4 cermet powers are prepared by heterogeneous precipitation-thermal reduction process and sintered on normal pressure with Y2O3-MgO additives.The effect of sintering temperature on the phase composition, microstructure and mechanical properties are discussed. Result of study indicates: the rise of sintering temperature is beneficial to retention the metal phase and the generation of β-Si3N4 whisker. At the temperature of 1650℃, Y-Mg-Si-O-N glass phase is generated, At the temperature of 1700℃, whiskers-like β-Si3N4, good wettability phases on Si3N4 surface, and high toughness Fe phase appeared in Fe-Mo/Si3N4 cermets. It can effectively better the microstructures of Fe-Mo/Si3N4 cermets, and contribute to improve the material mechanical perperties. When the temperature rise to 1750℃, the maximum particle MoSi2 can destroy the microscopic structure, and decreases the density and mechanical properties of ceramics fast. The optimum sintering temperature is therefore about 1700℃.

Published
2012
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