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Open AccessArticle

Microstructure and Properties of Thermal Electrode Material Si3N4–MoSi2 Composite Ceramics

by Lichao Feng 1,2,*, Pengfei Guan 1, Xuemei Yu 1,2 and Yiqiang He 1
1
School of Mechanical and Ocean Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
2
Marine Resources Development Institute of Jiangsu, Lianyungang 222001, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(6), 986; https://doi.org/10.3390/ma11060986
Received: 11 May 2018 / Revised: 5 June 2018 / Accepted: 9 June 2018 / Published: 11 June 2018
With good high temperature and corrosive resistance performance, ceramic based composites can be used as promising materials to replace metal thermocouple materials. In this study, Si3N4–MoSi2 composites were prepared via hot pressing technology. X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM) were used to analyze the microstructure of the composites. The mechanical properties and electrical conductivity were tested. The results showed that the composites were composed of β-Si3N4, MoSi2, a small amount of Mo5Si3, and an amorphous glassy phase. The MoSi2 phase was evenly distributed in the matrix. The percolation network was formed with increasing MoSi2 content. The strength of the composites reached its maximum value when the MoSi2 content reached a critical point. The electrical conductivity behaved like a typical percolation phenomenon. The percolation threshold was about 30% to 45%. View Full-Text
Keywords: thermal electrode materials; hot pressing; microstructure; mechanical properties; electrical conductivity thermal electrode materials; hot pressing; microstructure; mechanical properties; electrical conductivity
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Feng, L.; Guan, P.; Yu, X.; He, Y. Microstructure and Properties of Thermal Electrode Material Si3N4–MoSi2 Composite Ceramics. Materials 2018, 11, 986.

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