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A Novel Method to Improve the Dispersibility of Silicon Nitride Powders in Aqueous Media

Bingjie Xu

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Mengxing Li

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Qi Chen

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Pengfei Liu

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Baosong Xu

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Ben Qiu

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

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Liang Xu

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

Key Laboratory of Metallurgical Emission, Reduction and Resources Recycling, Ministry of Education, Ma’anshan, Anhui 243002, P. R. China

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, and

Zhao Han

http://orcid.org/0000-0002-0331-975X

School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, P. R. China

Key Laboratory of Metallurgical Emission, Reduction and Resources Recycling, Ministry of Education, Ma’anshan, Anhui 243002, P. R. China

E-mail Address: authanzhao@foxmail.com

Corresponding author.

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https://doi.org/10.1142/S1793292019501182Cited by:0 (Source: Crossref)

Abstract

The present study describes a novel method to improve the dispersibility of silicon nitride powders in aqueous media. Specifically, a new Si₃N₄@g-C₃N₄ core–shell composite material was synthesized via annealing the mixture of silicon nitride and melamine under a nitrogen atmosphere using heating method. The effects of various initial mass ratios of Si₃N₄ and melamine on the structure and dispersibility of the composite were systematically investigated. The results of X-ray photoelectron spectroscopy and transmission electron microscope demonstrated that as-obtained Si₃N₄@g-C₃N₄ composite powders possess the core–shell structure, whereas the zeta potential and sedimentation analysis showed that they exhibit good dispersion in aqueous media. Furthermore, the colloidal dispersion of the composite powders is most stable when the initial mass ratio of Si₃N₄ and melamine is 100:3. The coated g-C₃N₄ could be completely removed in a cryogenic nitrogen atmosphere. The proposed process is expected to provide novel avenues for the study of dispersion of other inorganic powders.

Keywords:

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