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Title: In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation

Abstract

Highlights: ► The hydrothermal method was firstly used to synthesize core–shell structured precursor to prepare WC–Co powder. ► WC–Co nanocomposite powder was obtained through in situ reduction and carbonization of the precursor in vacuum at 950 °C for 1 h. ► Particles of WC–Co composite indicated to have a crystallite size of 30–50 nm. -- Abstract: Cemented carbide WC–Co nanocomposite powders were synthesized through in situ reduction and carbonization of a core/shell precursor in vacuum. Samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The results revealed that WC–Co composite powders can be obtained at 950 °C for 1 h and the particle size is in the range from 30 to 50 nm with good dispersion. The formation mechanism of the WC–Co composite by in situ reduction and carbonization reactions was proposed. The preparation process could be divided into three steps: first, the reagents were dissolved and mixed to an aqueous solution; second step is to synthesize a carbon encapsulated core/shell nanostructure precursor using hydrothermal route, and finally, in situ reduction and carbonization of the precursor to the desired nanocomposite powders in vacuum.

Authors:
 [1];  [2];  [1];  [3];  [1]
  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)
  2. (China)
  3. School of Materials Science and Engineering, Southwest University, Chongqing 400715 (China)
Publication Date:
OSTI Identifier:
22215563
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 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:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; AQUEOUS SOLUTIONS; CARBIDES; CARBONIZATION; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURES; PARTICLE SIZE; POWDERS; PRECURSOR; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Lin, Hua, E-mail: lh2004@swu.edu.cn, School of Materials Science and Engineering, Southwest University, Chongqing 400715, Tao, Bowan, Li, Qing, and Li, Yanrong, E-mail: yrli@uestc.edu.cn. In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.07.038.
Lin, Hua, E-mail: lh2004@swu.edu.cn, School of Materials Science and Engineering, Southwest University, Chongqing 400715, Tao, Bowan, Li, Qing, & Li, Yanrong, E-mail: yrli@uestc.edu.cn. In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation. United States. doi:10.1016/J.MATERRESBULL.2012.07.038.
Lin, Hua, E-mail: lh2004@swu.edu.cn, School of Materials Science and Engineering, Southwest University, Chongqing 400715, Tao, Bowan, Li, Qing, and Li, Yanrong, E-mail: yrli@uestc.edu.cn. Thu . "In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation". United States. doi:10.1016/J.MATERRESBULL.2012.07.038.
@article{osti_22215563,
title = {In situ synthesis of WC–Co nanocomposite powder via core–shell structure formation},
author = {Lin, Hua, E-mail: lh2004@swu.edu.cn and School of Materials Science and Engineering, Southwest University, Chongqing 400715 and Tao, Bowan and Li, Qing and Li, Yanrong, E-mail: yrli@uestc.edu.cn},
abstractNote = {Highlights: ► The hydrothermal method was firstly used to synthesize core–shell structured precursor to prepare WC–Co powder. ► WC–Co nanocomposite powder was obtained through in situ reduction and carbonization of the precursor in vacuum at 950 °C for 1 h. ► Particles of WC–Co composite indicated to have a crystallite size of 30–50 nm. -- Abstract: Cemented carbide WC–Co nanocomposite powders were synthesized through in situ reduction and carbonization of a core/shell precursor in vacuum. Samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The results revealed that WC–Co composite powders can be obtained at 950 °C for 1 h and the particle size is in the range from 30 to 50 nm with good dispersion. The formation mechanism of the WC–Co composite by in situ reduction and carbonization reactions was proposed. The preparation process could be divided into three steps: first, the reagents were dissolved and mixed to an aqueous solution; second step is to synthesize a carbon encapsulated core/shell nanostructure precursor using hydrothermal route, and finally, in situ reduction and carbonization of the precursor to the desired nanocomposite powders in vacuum.},
doi = {10.1016/J.MATERRESBULL.2012.07.038},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}