Effect of Y2O3–MgO Addition on Heterogeneous Precipitation-Thermal Reduction Synthesis and Sintering of Fe–Mo/Si3N4 Powders

doi:10.1016/j.jmst.2013.05.010

J. Mater. Sci. Technol.

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Effect of Y₂O₃–MgO Addition on Heterogeneous Precipitation-Thermal Reduction Synthesis and Sintering of Fe–Mo/Si₃N₄ Powders

Ruiming Yin, Fubao Ji, Qinglin Hou, Fusheng Liu, Jing Li, Linzhang Chen

College of Metallurgical Engineering, Hunan University of Technology, Zhuzhou 412008, China

Received:2012-03-08 Revised:2012-12-03 Online:2014-03-15 Published:2014-03-17
Contact: R.M. Yin
Supported by:
National Natural Science Foundation of China (Nos. 51274093 and 50804016) and the Key Discipline Project Foundation of Hunan Province, China (No. 0805).

Abstract

Abstract:

Effect of Y₂O₃–MgO addition on heterogeneous precipitation-thermal reduction synthesis and the sintering of Fe–Mo/Si₃N₄ powders has been investigated. It was found that the whiskers-like β-Si₃N₄, good wettability phases on Si₃N₄ surface, and high toughness Fe phase appeared in Fe–Mo/Si₃N₄ cermets with Y₂O₃–MgO additives. The results show that Y₂O₃–MgO additives can effectively optimize the microstructures of Fe–Mo/Si₃N₄ cermets, and improve the material mechanical properties. Therefore, it indicated that Y₂O₃–MgO additives can be used for strengthening of sintered cermets, and the dual function of whiskers self-toughening and different metal-composition toughening can be achieved in Fe–Mo/Si₃N₄ cermets with Y₂O₃–MgO additives.

Key words: Y2O3eMgO addition, FeeMo/Si3N4, Metal-composition, Whiskers self-toughening

Ruiming Yin, Fubao Ji, Qinglin Hou, Fusheng Liu, Jing Li, Linzhang Chen. Effect of Y₂O₃–MgO Addition on Heterogeneous Precipitation-Thermal Reduction Synthesis and Sintering of Fe–Mo/Si₃N₄ Powders[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.05.010.

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Effect of Y₂O₃–MgO Addition on Heterogeneous Precipitation-Thermal Reduction Synthesis and Sintering of Fe–Mo/Si₃N₄ Powders

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