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Open AccessArticle

Effects of Si/C Ratio on the Phase Composition of Si-C-N Powders Synthesized by Carbonitriding

by Cong Zhang 1, Ling Qu 1 and Wenjie Yuan 1,2,*
1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 346; https://doi.org/10.3390/ma13020346
Received: 24 November 2019 / Revised: 7 January 2020 / Accepted: 7 January 2020 / Published: 12 January 2020
(This article belongs to the Section Advanced Composites)
Si-C-N based materials possess interesting properties such as high hardness and oxidation resistance. The compacts of silicon and cornstarch with different Si/C ratios were subjected to carbonitriding at 1350–1550 °C. Reaction products were characterized by X-ray powder diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The effects of Si/C ratio on the phase composition of Si-C-N powders were investigated. The results revealed that the Si/C ratio played a crucial role on the formation of crystalline silicon carbonitride (SiCN) and the phase composition of Si-C-N powders. It was demonstrated that liquid silicon is an important medium and reaction site for the introduction of nitrogen, so the Si content in reactants has affected the N content in the product. On the other hand, carbon participates in the carbonization of Si3N4 and the formation of SiC. The contents of C-N bond and SiCN in the products are carbon content-dependent. Combining the above two aspects, the maximum yield of SiCN can be achieved with the Si/C ratio of 1:1 to 1:1.5. View Full-Text
Keywords: Si-C-N powders; phase composition; carbonitriding Si-C-N powders; phase composition; carbonitriding
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Zhang, C.; Qu, L.; Yuan, W. Effects of Si/C Ratio on the Phase Composition of Si-C-N Powders Synthesized by Carbonitriding. Materials 2020, 13, 346.

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