skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A mechanistic study on the synthesis of β-Sialon whiskers from coal fly ash

Abstract

Graphical abstract: The appearance of bead-like whiskers indicated that the growth mechanism of the β-Sialon whiskers was different from the conventional one, in which a chain of droplets were formed and then consumed to participate in the formation of the whiskers. - Highlights: • β-Sialon whiskers were synthesized using waste fly ash by carbothemal reduction reaction under nitrogen atmosphere. • Rod-like β-Sialon whiskers with a diameter of 100–500 nm were formed. • Bead-like whiskers as intermediate morphology of the growing β-Sialon whiskers were found with increasing sintering time. • The growth mechanism of β-Sialon whiskers was different from the conventional VLS mechanism. • A chain of droplets were formed and participated in the formation of the whiskers. - Abstract: β-Sialon whiskers were produced at 1420 °C through carbothemal reduction reaction under nitrogen atmosphere using fly ash from coal-fired power plants. The effects of sintering time on the phase formation and morphology of the products were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) techniques. Rod-like β-Sialon whiskers with the diameter of 100–500 nm were successfully formed. With increasing sintering time, bead-like morphology during the growth process of the whiskers was found, and growth mechanismmore » of β-Sialon whiskers was also discussed in detail. The growth mechanism proposed in this study was different from the conventional vapor–liquid–solid (VLS) mechanism.« less

Authors:
;  [1];  [1];  [2];  [1]
  1. Thermal Energy Research Centre, Shenyang Aerospace University, Shenyang 110136 (China)
  2. (Australia)
Publication Date:
OSTI Identifier:
22475755
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 65; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; COAL; CRYSTAL GROWTH; FLY ASH; LIQUIDS; NANOSTRUCTURES; NITROGEN; REDUCTION; SCANNING ELECTRON MICROSCOPY; SILICON NITRIDES; SINTERING; SPECTROMETERS; SYNTHESIS; WHISKERS; X-RAY DIFFRACTION

Citation Formats

Zhao, H., Wang, P.Y., Yu, J.L., E-mail: jianglong.yu@newcastle.edu.au, Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, and Zhang, J. A mechanistic study on the synthesis of β-Sialon whiskers from coal fly ash. United States: N. p., 2015. Web. doi:10.1016/J.MATERRESBULL.2015.01.039.
Zhao, H., Wang, P.Y., Yu, J.L., E-mail: jianglong.yu@newcastle.edu.au, Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, & Zhang, J. A mechanistic study on the synthesis of β-Sialon whiskers from coal fly ash. United States. doi:10.1016/J.MATERRESBULL.2015.01.039.
Zhao, H., Wang, P.Y., Yu, J.L., E-mail: jianglong.yu@newcastle.edu.au, Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, and Zhang, J. Fri . "A mechanistic study on the synthesis of β-Sialon whiskers from coal fly ash". United States. doi:10.1016/J.MATERRESBULL.2015.01.039.
@article{osti_22475755,
title = {A mechanistic study on the synthesis of β-Sialon whiskers from coal fly ash},
author = {Zhao, H. and Wang, P.Y. and Yu, J.L., E-mail: jianglong.yu@newcastle.edu.au and Chemical Engineering, University of Newcastle, Callaghan, NSW 2308 and Zhang, J.},
abstractNote = {Graphical abstract: The appearance of bead-like whiskers indicated that the growth mechanism of the β-Sialon whiskers was different from the conventional one, in which a chain of droplets were formed and then consumed to participate in the formation of the whiskers. - Highlights: • β-Sialon whiskers were synthesized using waste fly ash by carbothemal reduction reaction under nitrogen atmosphere. • Rod-like β-Sialon whiskers with a diameter of 100–500 nm were formed. • Bead-like whiskers as intermediate morphology of the growing β-Sialon whiskers were found with increasing sintering time. • The growth mechanism of β-Sialon whiskers was different from the conventional VLS mechanism. • A chain of droplets were formed and participated in the formation of the whiskers. - Abstract: β-Sialon whiskers were produced at 1420 °C through carbothemal reduction reaction under nitrogen atmosphere using fly ash from coal-fired power plants. The effects of sintering time on the phase formation and morphology of the products were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) techniques. Rod-like β-Sialon whiskers with the diameter of 100–500 nm were successfully formed. With increasing sintering time, bead-like morphology during the growth process of the whiskers was found, and growth mechanism of β-Sialon whiskers was also discussed in detail. The growth mechanism proposed in this study was different from the conventional vapor–liquid–solid (VLS) mechanism.},
doi = {10.1016/J.MATERRESBULL.2015.01.039},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 65,
place = {United States},
year = {2015},
month = {5}
}